US20060118294A1 - Frameless snubbing unit - Google Patents
Frameless snubbing unit Download PDFInfo
- Publication number
- US20060118294A1 US20060118294A1 US11/002,277 US227704A US2006118294A1 US 20060118294 A1 US20060118294 A1 US 20060118294A1 US 227704 A US227704 A US 227704A US 2006118294 A1 US2006118294 A1 US 2006118294A1
- Authority
- US
- United States
- Prior art keywords
- load
- snubbing
- cylinder
- tubular
- snubbing unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000012530 fluid Substances 0.000 abstract description 11
- 230000000712 assembly Effects 0.000 abstract description 4
- 238000000429 assembly Methods 0.000 abstract description 4
- 238000012546 transfer Methods 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000036461 convulsion Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/068—Well heads; Setting-up thereof having provision for introducing objects or fluids into, or removing objects from, wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
Definitions
- the invention relates to snubbing units for manipulating tubing in and out of a well under pressure. More particularly, specific arrangements of the load-bearing components minimize weight, stress and exposure to well effluent.
- Snubbing units are known in the oil and gas industry for facilitating access to a well which is under pressure including, for example, well operations such as well completions.
- a snubbing unit manipulates various tubular components such as pipe, tubing, and bottom hole assemblies (BHA) in and out of a well while controlling the well under pressure.
- Wellhead components are not conventionally equipped to deal with the manipulation of tubular components therethrough. Therefore, additional hardware in cooperation with the snubbing unit provides additional sealing and physical handling components which are required to handle tubular components, which may be either heavy tubular components which tend to fall into the well, termed “pipe heavy”, or which can be upwardly energized for ejection from the well under pressure, termed “pipe light”.
- a snubbing unit employs stationary (lower) and traveling (upper) slip assemblies, opposingly oriented, to releasably and controllable shift tubulars into and out of the well through a wellhead despite the possibility of either heavy tubular loads which urge the pipe to fall into well or the pressure-generated forces on the tubulars which urge the tubular out of the well.
- the snubbing unit is installed above an existing wellhead seal and incorporates its own seals to seal the tubulars as they are introduced or removed from the wellhead. Applicant is aware of early snubbing units such as that set forth in U.S. Pat. No.
- Hydraulic cylinders are clamped between upper and lower head plates, secured together by a plurality of stud bolts and forming a frame to the wellhead.
- the stationary slip assembly is supported on the upper head plate of the frame and on the cylinders acting in part as support columns in compression. Loads on the stationary slip assembly are transferred through the frame.
- the base plate of the frame is a unitary member providing connection to the wellhead and for housing a stripper which sealingly engages the tubulars passing therethrough.
- the Brown unit and in more contemporary snubbing units are characterized by similar frame structures.
- a variety of challenges result, including manufacturing imprecision and variability in alignment of the hydraulic actuators and limitations in selections of materials.
- One dramatic result of residual stresses and misalignment of the actuators in conventional units is termed “walking of the jack” wherein the lifting actuators or jacks tend to operate independently in small alternating jerks, due to slight misalignment in the structure, imposing greater wear on components such as hydraulic actuator seals, glands and rods. This “walking”, if severe, can compromise the safety of the snubbing operation which may include failure of the slips “bite” on the tubing being manipulated.
- a snubbing unit in which tubular manipulation loads are transferred through a snubbing structure to the wellhead without the need for an intermediary frame.
- the present frameless snubbing unit makes use of the structural strength, integrity, and precision inherent in hydraulic actuators to both support and manipulate the traveling slip assembly.
- the stationary slip assembly is supported by the snubbing structure and substantially independent from the hydraulic actuators.
- the snubbing unit employs fewer load bearing components which are machined and bolted together allowing the structure to be constructed in less time and with greater accuracy.
- the snubbing loads are now transferred directly from the traveling slip assembly and through the hydraulic actuators to load members such as a load plate secured to the snubbing structure, thereby avoiding the need for a frame or intermediary structure which is subject to stress, fatigue and misalignment.
- load members such as a load plate secured to the snubbing structure
- the arrangement of the hydraulic actuators and the snubbing structure results in a stronger assembly which minimizes misalignment.
- Precision machining and bolted assembly minimizes misalignment and “walking” of the traveling slip assembly which reduces or eliminate stresses on the snubbing unit in use. Further, minimizing misalignment virtually eliminates the walking phenomenon and associated wear.
- the structure becomes much stiffer and stronger by using the hydraulic cylinders themselves as the load transfer structural components.
- This embodiment of a snubbing unit has a much higher safety factor in its design than the prior art style of utilizing a frame-type of structure.
- the unit assembly time can be reduced by about
- the hydraulic actuators transfer the load through the load plate into the snubbing structure.
- the flanges on the hydraulic cylinders are mounted in a position which allows for maximum stroke with a minimum overall height of the unit and are designed to provide the best stability therefor.
- an arrangement wherein the load plate is mechanically affixed to the snubbing structure avoids restrictions on materials of construction and thereby enables the use of lighter, stronger engineered materials. Without the need for welding, which eliminates the natural stresses inherent in a welded structure, the hydraulic cylinders, as the sole load bearing structure, remains true and square. Further, where the load plate is bolted to the structure, additional stresses and misalignment are eliminated which are inherent with welded structures. Moreover, the load plate can be located externally from the snubbing structure, thereby isolating the load plate from well effluents like H 2 S and allowing higher strength, lighter engineered materials to be used.
- a snubbing unit comprises: a lower connection adapted to a wellhead and a tubular snubbing structure above the lower connection and having a working bore having a common axis with the wellbore.
- a stationary slip assembly is supported on the tubular snubbing structure, and a traveling plate is movable independently of the tubular snubbing structure and has a traveling slip assembly supported thereon for imparting or receiving snubbing loads.
- One or more load members are supported by and extend laterally from the tubular snubbing structure
- At least two actuators are positioned parallel to the common axis and secured to the load members, each comprising a cylinder and a hydraulically-actuated rod moveable therein, each cylinder being secured intermediate its length to the one or more load members and each rod having a lower end actuable in the cylinder and an upper end secured to the traveling plate wherein, actuation of the rods moves the traveling plate and snubbing loads are transferred through the rods, to the cylinders, to the load members to the tubular snubbing structure.
- the load members are fastened to the snubbing structure through an outer flange isolated from the wellbore and can therefore be formed of materials, such as higher strength materials, which are selected independent of the wellbore fluid characteristics.
- FIG. 1 is a side view of one embodiment of the snubbing unit atop a wellhead and having personnel access and safety railings illustrated thereon;
- FIG. 2 is a partial, side, cross-sectional view of the embodiment FIG. 1 with the personnel access and safety railing structure removed for clarity;
- FIG. 3 is a perspective top-down view of the snubbing unit of FIG. 1 with a hydraulic cylinder retainer illustrated exploded from the load plate;
- FIG. 4 is a perspective top-down and exploded view, in isolation from the remainder of the snubbing unit, of a pair of hydraulic actuators, the load plate extending from the load spool, and hydraulic cylinder clamps;
- FIG. 5 is a perspective bottom-up view of the snubbing unit of FIG. 3 ;
- FIG. 6 is a view of the snubbing unit of FIG. 4 with a separate and external mounting of the load plate with a fanciful illustration of the load plate displaced from the unit's tubular structure so as to better expose the load plate port and load spool bolting flange;
- FIG. 7 is a perspective top-down and exploded view, in isolation from the remainder of the snubbing unit of FIG. 6 , the separate load plate being loose and illustrated prior to bolting to the load spool flange and with one hydraulic actuator exploded from the load plate and the other hydraulic actuator having the cylinder and rod exploded with the cylinder being displaced from both the rod, bearing the traveling plate, and the load plate;
- FIG. 8 is a plan view of an alternate load plate equipped for four hydraulic actuators
- FIG. 9 is a broken-length, cross-sectional view of one of a pair of hydraulic actuators for raising and lowering the traveling plate.
- FIGS. 10 a and 10 b are cross-sectional views of the snubbing unit with the traveling plate and upper slip assembly in the raised and lowered positions respectively.
- a snubbing unit 10 comprises a tubular snubbing structure 11 secured atop a wellhead 12 at a lower connection 13 such as an industry standard 3000 or 5000 psi flanged connection.
- the top of the wellhead 12 is represented by a conventional spool, however those of skill in the art understand that other components may exist, or could be provided as part of the snubbing unit 10 .
- the wellhead 12 normally blocks the wellbore of a well (not shown) under pressure.
- the snubbing unit 10 employs a lower, stationary slip assembly 14 and an upper, traveling slip assembly 15 for releasably and controllably shifting tubulars (not shown) along a common axis through the tubular snubbing structure 11 and the wellhead 12 below.
- the tubular snubbing structure 11 has a working bore which is open to communicate with the wellbore.
- the tubular snubbing structure 11 also incorporates a stripping annular BOP 16 for sealing about the tubulars which are manipulated therethrough.
- the traveling slip assembly 15 is supported on a traveling plate 21 which is raised and lowered on at least two hydraulic actuators 30 .
- a pair of hydraulic actuators 30 is shown, however, three actuators positioned at 120° (not shown), or four positioned at 90° (See FIG. 7 ), or even more can be used.
- the hydraulic actuators 30 impart or receive snubbing loads from the traveling plate 21 to the tubular snubbing structure, and to the wellhead 12 .
- Flanges 28 at the top of hydraulic actuators 30 can be employed to support an operator's platform and safety railing 29 .
- tubular snubbing structure 11 further incorporates tongs 17 and additional operational features located between the wellhead 12 and the stationary slip assembly 14 comprising: primary well control BOP's 18 , a stripping pipe ram 19 , and a working or load spool 20 .
- the height of the load spool 20 is sized to provide working space between the stripping annular BOP 16 above the stripping pipe ram 19 for housing and removal of tubulars such as a BHA from the wellhead 12 .
- each of the hydraulic actuators 30 comprise a cylinder 31 and a rod 32 .
- the cylinders 31 are spaced laterally from and parallel to the common axis of the tubular snubbing structure 11 .
- the cylinders 31 are mounted to one or more load members 60 which extend from the load spool 20 of the tubular snubbing structure 11 , for example, one load member 60 could extend laterally across the common axis and support two diametrically opposed and parallel hydraulic actuators 30 .
- two or more load members 60 could extend, individually or as a combined structure or unitary plate, generally and radially outwards from the common axis to support a plurality of hydraulic actuators 30 .
- the lateral extension of the one or more load members 60 is sufficient to space the hydraulic actuators 30 from the various components along the common axis of the snubbing structure 11 including the stripping annular BOP 16 and the slip assemblies 14 , 15 .
- the rods 32 are mounted to the traveling plate 21 . Hydraulics raise and lower the rods 32 relative to the cylinders 31 , thereby raising and lowering the traveling plate and traveling slip assembly 21 , 15 relative to the stationary slip assembly 14 .
- the cylinders 31 are mounted to the load members 60 somewhere intermediate along their length, and preferably about midway therealong, thereby positioning the traveling slip assembly 15 in close proximity to the stationary slip assembly 14 when fully retracted to a lowered position. Further, such spacing enables maximum stroke with a minimum overall height of the snubbing unit 10 while maintaining suitable stability.
- the mounting of the hydraulic actuators 30 through the load members 60 to the tubular snubbing structure 11 minimizes the introduction of manufacturing stress and misalignment.
- the cylinders 31 are removeably secured through mechanical fastening, not welding, to the load members 60 .
- the cylinders 31 can be bolted to the load members 60 using flanges 34 or alternative clamping arrangements (not shown).
- the hydraulic actuators 30 are illustrated as being mechanically fastened to the load members 60 .
- one or more load members 60 can be formed and be integrated into a unitary load plate 33 which is connected in some secure fashion to the load spool 20 .
- Two or more load members 60 are now provided in a single unitary load plate 33 .
- the load members 60 can be integral with the tubular snubbing structure 11 , such as extending as an oversized flange from the load spool 20 or can be a member or plate sandwiched between adjacent flanges. In both instances, at least a portion of the load members 60 are exposed to the working bore. In other instances the load members 60 are separated from and secured external to the tubular snubbing structure 11 ; in such cases the load members 60 being isolated from the working bore.
- the load plate 33 is optionally separate, as more clearly illustrated in the identified drawings, from the load spool 20 and, as such, is mechanically fastened to the tubular snubbing structure 11 at flange 35 . Separation of the load plate 33 as an independent structure from the load spool 20 provides greater options in selecting material properties for the load plate 33 .
- the working bore of the tubular snubbing structure 11 can be in communication with wellbore fluids which dictate selection and restriction of the materials of construction to account of corrosion and related service conditions.
- H 2 S hydrogen sulphide
- the materials of construction of components exposed thereto are typically restricted, and regulated to be conventional carbons steel.
- all piping and components are firstly to ASTM and ASME standards and secondly those exposed to hydrogen sulfide (H 2 S) bearing hydrocarbon service are provided accordance with the appropriate requirements of the National Association of Corrosion Engineers (NACE) such as those current set forth in NACE/MR0175.
- NACE National Association of Corrosion Engineers
- components which transfer the loads to the wellhead 12 are typically constructed of conventional materials and are limited to the strength of such suitable materials. Conventionally therefore, greater load carrying capacity is only obtained by using thicker, heavier components. However, material selection can be expanded by removing the structure materials from exposure to the wellbore fluids.
- the load members 60 extend from or are incorporated into one or more load plates 33 which are discrete components from the tubular snubbing structure and, thus, which are isolated from the wellbore fluids.
- the one or more load plates are mechanically connected to the outer flange 35 of the load spool 20 .
- a single load plate 33 is formed having a central port 37 sized to fit about a tubular body portion of the load spool 20 and positionable adjacent the outer flange 35 for bolting connection thereto.
- the port 37 of the load plate 33 is fit about the load spool 20 prior to final fitting of spaced-apart, welded flanges, one of which is the flanged connection 35 .
- load members 60 of the load plate 33 can be engineered to best suit the loads and service life required.
- load members 60 of conventional mild steel, such as that integral with the load spool 20 may be in the order of 4 inches in thickness so as to accommodate traveling slip assembly loads in the order of 200,000 pounds.
- a suitable required thickness would only be about 2 to 2-1 ⁇ 2 inches thick with commensurate weight savings of up to 35 to 50%.
- the flanged connections 34 , 35 of the hydraulic actuators 30 and load plate 33 respectively both aid the parallel alignment of the hydraulic actuators 30 and the tubular snubbing structure 11 .
- the cylinder flanges 34 can be made in controlled manufacturing conditions with appropriate jigs and subsequent stress relief.
- the hydraulic actuators 30 can be secured to the load plate 33 and relative to the tubular snubbing structure 11 with precision, thereby minimizing residual stresses, misalignment and resultant operational difficulties such as any detrimental interaction between the hydraulic actuators 30 , such as walking of the traveling plate 21 .
- the hydraulic actuators 30 also are readily assembled and removed for maintenance through load plate clamps or retainers 41 .
- the load plate 33 is formed with slotted openings 40 for receiving the cylinders 31 .
- the retainer 41 is mechanically secured to sandwich the cylinder 31 therebetween and thereby fix the cylinder's lateral position.
- Flanges 34 secure the vertical position of the cylinders 31 to the load plate 33 .
- Alternative fitting of the cylinders 31 to the load plate 33 comprise fitting actuator ports in the load plate 33 , such as those resulting where the retainer is permanently fixed in the load plate 33 , and sliding the cylinders axially through the actuator ports for mechanical fastening to the load plate 33 through the flange 34 or other clamping means.
- each hydraulic actuator 30 comprises the cylinder 31 and the rod 32 .
- the cylinders 31 can comprise an outer barrel 50 within which the rod 32 and a piston 51 can reciprocate.
- a cylinder and rod actuator also represent fairly conventional hydraulic actuators which are also suitable for the present snubbing unit 10 .
- the rod 32 is hollow and the actuators 30 further comprise an inner barrel 52 which is sealable within the rod 32 . The use of the inner barrel 52 reduces the actuator's weight significantly due to the removal of the metal mass from the inside the rod 32 .
- hydraulic actuators 30 of conventional or hollow design are operated to reciprocate the traveling slip assembly 15 between a raised position ( FIG. 10 a ) and a lowered position ( FIG. 10 b ).
- the snubbing unit 10 has fewer load-bearing components and those few components can be machined with great accuracy (typically 0.005 of an inch).
- the components can be bolted together allowing the unit to be constructed in less time, reducing the assembly to about one half the conventional time. Without the need for welding, which eliminates the natural stresses inherent in a welded structure, the resulting structure remains true and square. Further, by avoiding combining structural requirements with wellbore-exposed components, and thus avoiding wellbore fluids, a higher strength and thus thinner and lighter engineered material can be used to bear the loads.
Abstract
A traveling slip assembly of a snubbing unit is supported directly through mechanical fastening of two or more hydraulic actuators to one or more load members extending from a tubular snubbing structure for transfer of snubbing loads to a wellhead. A stationary slip assembly is supported by the snubbing structure and is substantially independent from the hydraulic actuators. This arrangement ensures proper alignment of the traveling and stationary slip assemblies and the tubular snubbing structure enabling ease of assembly, precise alignment and a lighter overall structure. Preferably, the load members are part of load plate which is mechanically fastened to an outer flange on the snubbing structure, and separate therefrom, thereby being isolated from the wellbore fluids and permits the load plate's material properties to be selected without consideration of corrosion restrictions and thereby allowing a stronger and lighter load plate to be employed.
Description
- The invention relates to snubbing units for manipulating tubing in and out of a well under pressure. More particularly, specific arrangements of the load-bearing components minimize weight, stress and exposure to well effluent.
- Snubbing units are known in the oil and gas industry for facilitating access to a well which is under pressure including, for example, well operations such as well completions. A snubbing unit manipulates various tubular components such as pipe, tubing, and bottom hole assemblies (BHA) in and out of a well while controlling the well under pressure. Wellhead components are not conventionally equipped to deal with the manipulation of tubular components therethrough. Therefore, additional hardware in cooperation with the snubbing unit provides additional sealing and physical handling components which are required to handle tubular components, which may be either heavy tubular components which tend to fall into the well, termed “pipe heavy”, or which can be upwardly energized for ejection from the well under pressure, termed “pipe light”.
- Generally, a snubbing unit employs stationary (lower) and traveling (upper) slip assemblies, opposingly oriented, to releasably and controllable shift tubulars into and out of the well through a wellhead despite the possibility of either heavy tubular loads which urge the pipe to fall into well or the pressure-generated forces on the tubulars which urge the tubular out of the well. The snubbing unit is installed above an existing wellhead seal and incorporates its own seals to seal the tubulars as they are introduced or removed from the wellhead. Applicant is aware of early snubbing units such as that set forth in U.S. Pat. No. 3,096,075 to Brown, and those using similar principles, which employ hydraulic actuators to raise and lower the traveling slip assembly relative to the stationary slip assembly supported by the wellhead. Hydraulic cylinders are clamped between upper and lower head plates, secured together by a plurality of stud bolts and forming a frame to the wellhead. The stationary slip assembly is supported on the upper head plate of the frame and on the cylinders acting in part as support columns in compression. Loads on the stationary slip assembly are transferred through the frame. The base plate of the frame is a unitary member providing connection to the wellhead and for housing a stripper which sealingly engages the tubulars passing therethrough.
- The Brown unit and in more contemporary snubbing units are characterized by similar frame structures. A variety of challenges result, including manufacturing imprecision and variability in alignment of the hydraulic actuators and limitations in selections of materials. One dramatic result of residual stresses and misalignment of the actuators in conventional units is termed “walking of the jack” wherein the lifting actuators or jacks tend to operate independently in small alternating jerks, due to slight misalignment in the structure, imposing greater wear on components such as hydraulic actuator seals, glands and rods. This “walking”, if severe, can compromise the safety of the snubbing operation which may include failure of the slips “bite” on the tubing being manipulated.
- In one aspect, a snubbing unit is provided in which tubular manipulation loads are transferred through a snubbing structure to the wellhead without the need for an intermediary frame. The present frameless snubbing unit makes use of the structural strength, integrity, and precision inherent in hydraulic actuators to both support and manipulate the traveling slip assembly. The stationary slip assembly is supported by the snubbing structure and substantially independent from the hydraulic actuators. The snubbing unit employs fewer load bearing components which are machined and bolted together allowing the structure to be constructed in less time and with greater accuracy.
- In one embodiment of the invention, the snubbing loads are now transferred directly from the traveling slip assembly and through the hydraulic actuators to load members such as a load plate secured to the snubbing structure, thereby avoiding the need for a frame or intermediary structure which is subject to stress, fatigue and misalignment. Further the arrangement of the hydraulic actuators and the snubbing structure results in a stronger assembly which minimizes misalignment. Precision machining and bolted assembly minimizes misalignment and “walking” of the traveling slip assembly which reduces or eliminate stresses on the snubbing unit in use. Further, minimizing misalignment virtually eliminates the walking phenomenon and associated wear. The structure becomes much stiffer and stronger by using the hydraulic cylinders themselves as the load transfer structural components. This embodiment of a snubbing unit has a much higher safety factor in its design than the prior art style of utilizing a frame-type of structure. The unit assembly time can be reduced by about half with significant reduction in weight.
- The hydraulic actuators transfer the load through the load plate into the snubbing structure. The flanges on the hydraulic cylinders are mounted in a position which allows for maximum stroke with a minimum overall height of the unit and are designed to provide the best stability therefor.
- Further, an arrangement wherein the load plate is mechanically affixed to the snubbing structure avoids restrictions on materials of construction and thereby enables the use of lighter, stronger engineered materials. Without the need for welding, which eliminates the natural stresses inherent in a welded structure, the hydraulic cylinders, as the sole load bearing structure, remains true and square. Further, where the load plate is bolted to the structure, additional stresses and misalignment are eliminated which are inherent with welded structures. Moreover, the load plate can be located externally from the snubbing structure, thereby isolating the load plate from well effluents like H2S and allowing higher strength, lighter engineered materials to be used.
- In a broad aspect of the invention, a snubbing unit comprises: a lower connection adapted to a wellhead and a tubular snubbing structure above the lower connection and having a working bore having a common axis with the wellbore. A stationary slip assembly is supported on the tubular snubbing structure, and a traveling plate is movable independently of the tubular snubbing structure and has a traveling slip assembly supported thereon for imparting or receiving snubbing loads. One or more load members are supported by and extend laterally from the tubular snubbing structure At least two actuators are positioned parallel to the common axis and secured to the load members, each comprising a cylinder and a hydraulically-actuated rod moveable therein, each cylinder being secured intermediate its length to the one or more load members and each rod having a lower end actuable in the cylinder and an upper end secured to the traveling plate wherein, actuation of the rods moves the traveling plate and snubbing loads are transferred through the rods, to the cylinders, to the load members to the tubular snubbing structure.
- Preferably the load members are fastened to the snubbing structure through an outer flange isolated from the wellbore and can therefore be formed of materials, such as higher strength materials, which are selected independent of the wellbore fluid characteristics.
-
FIG. 1 is a side view of one embodiment of the snubbing unit atop a wellhead and having personnel access and safety railings illustrated thereon; -
FIG. 2 is a partial, side, cross-sectional view of the embodimentFIG. 1 with the personnel access and safety railing structure removed for clarity; -
FIG. 3 is a perspective top-down view of the snubbing unit ofFIG. 1 with a hydraulic cylinder retainer illustrated exploded from the load plate; -
FIG. 4 is a perspective top-down and exploded view, in isolation from the remainder of the snubbing unit, of a pair of hydraulic actuators, the load plate extending from the load spool, and hydraulic cylinder clamps; -
FIG. 5 is a perspective bottom-up view of the snubbing unit ofFIG. 3 ; -
FIG. 6 is a view of the snubbing unit ofFIG. 4 with a separate and external mounting of the load plate with a fanciful illustration of the load plate displaced from the unit's tubular structure so as to better expose the load plate port and load spool bolting flange; -
FIG. 7 is a perspective top-down and exploded view, in isolation from the remainder of the snubbing unit ofFIG. 6 , the separate load plate being loose and illustrated prior to bolting to the load spool flange and with one hydraulic actuator exploded from the load plate and the other hydraulic actuator having the cylinder and rod exploded with the cylinder being displaced from both the rod, bearing the traveling plate, and the load plate; -
FIG. 8 is a plan view of an alternate load plate equipped for four hydraulic actuators; -
FIG. 9 is a broken-length, cross-sectional view of one of a pair of hydraulic actuators for raising and lowering the traveling plate; and -
FIGS. 10 a and 10 b are cross-sectional views of the snubbing unit with the traveling plate and upper slip assembly in the raised and lowered positions respectively. - With reference to
FIG. 1 , a snubbingunit 10 comprises atubular snubbing structure 11 secured atop awellhead 12 at alower connection 13 such as an industry standard 3000 or 5000 psi flanged connection. The top of thewellhead 12 is represented by a conventional spool, however those of skill in the art understand that other components may exist, or could be provided as part of thesnubbing unit 10. Thewellhead 12 normally blocks the wellbore of a well (not shown) under pressure. Before nippling up to thewellhead 12, various procedures are performed as necessary to ensure site safety such as to install a plug in any tubing extending into the wellbore, and to ensure that a tubing hanger is secured in the casing bowl for sealing well fluids in the wellbore. It is understood that the term fluid used herein includes either liquid or gases. - The
snubbing unit 10 employs a lower,stationary slip assembly 14 and an upper, travelingslip assembly 15 for releasably and controllably shifting tubulars (not shown) along a common axis through thetubular snubbing structure 11 and thewellhead 12 below. Thetubular snubbing structure 11 has a working bore which is open to communicate with the wellbore. Typically, thetubular snubbing structure 11 also incorporates a strippingannular BOP 16 for sealing about the tubulars which are manipulated therethrough. - The traveling
slip assembly 15 is supported on atraveling plate 21 which is raised and lowered on at least twohydraulic actuators 30. A pair ofhydraulic actuators 30 is shown, however, three actuators positioned at 120° (not shown), or four positioned at 90° (SeeFIG. 7 ), or even more can be used. Thehydraulic actuators 30 impart or receive snubbing loads from thetraveling plate 21 to the tubular snubbing structure, and to thewellhead 12.Flanges 28 at the top ofhydraulic actuators 30 can be employed to support an operator's platform andsafety railing 29. - Typically the
tubular snubbing structure 11 further incorporatestongs 17 and additional operational features located between thewellhead 12 and thestationary slip assembly 14 comprising: primary well control BOP's 18, a stripping pipe ram 19, and a working orload spool 20. The height of theload spool 20 is sized to provide working space between the strippingannular BOP 16 above the stripping pipe ram 19 for housing and removal of tubulars such as a BHA from thewellhead 12. - With reference also to
FIG. 2 , each of thehydraulic actuators 30 comprise acylinder 31 and arod 32. In this embodiment, thecylinders 31 are spaced laterally from and parallel to the common axis of thetubular snubbing structure 11. Thecylinders 31 are mounted to one ormore load members 60 which extend from theload spool 20 of thetubular snubbing structure 11, for example, oneload member 60 could extend laterally across the common axis and support two diametrically opposed and parallelhydraulic actuators 30. Similarly, two ormore load members 60 could extend, individually or as a combined structure or unitary plate, generally and radially outwards from the common axis to support a plurality ofhydraulic actuators 30. The lateral extension of the one ormore load members 60 is sufficient to space thehydraulic actuators 30 from the various components along the common axis of the snubbingstructure 11 including the strippingannular BOP 16 and theslip assemblies - The
rods 32 are mounted to the travelingplate 21. Hydraulics raise and lower therods 32 relative to thecylinders 31, thereby raising and lowering the traveling plate and travelingslip assembly stationary slip assembly 14. - The
cylinders 31 are mounted to theload members 60 somewhere intermediate along their length, and preferably about midway therealong, thereby positioning the travelingslip assembly 15 in close proximity to thestationary slip assembly 14 when fully retracted to a lowered position. Further, such spacing enables maximum stroke with a minimum overall height of the snubbingunit 10 while maintaining suitable stability. - The mounting of the
hydraulic actuators 30 through theload members 60 to thetubular snubbing structure 11 minimizes the introduction of manufacturing stress and misalignment. In particular, thecylinders 31 are removeably secured through mechanical fastening, not welding, to theload members 60. As shown, thecylinders 31 can be bolted to theload members 60 usingflanges 34 or alternative clamping arrangements (not shown). - Use of the
hydraulic actuators 30 alone as the sole load-transferring structure for raising and lowering the travelingslip assembly 15 results in fewer load bearing components which can be machined with great accuracy (typically 0.005 of an inch) and also through mechanical fastening of thehydraulic actuators 30 to theload members 60, the snubbing unit can be accurately aligned and assembled in about one half the usual time. Without the need for welding, which eliminates the natural stresses inherent in a welded structure, the resulting structure remains true and square. - With reference to
FIGS. 1, 3 and 4, thehydraulic actuators 30 are illustrated as being mechanically fastened to theload members 60. As shown, one ormore load members 60 can be formed and be integrated into aunitary load plate 33 which is connected in some secure fashion to theload spool 20. Two ormore load members 60 are now provided in a singleunitary load plate 33. - Generally, the
load members 60 can be integral with thetubular snubbing structure 11, such as extending as an oversized flange from theload spool 20 or can be a member or plate sandwiched between adjacent flanges. In both instances, at least a portion of theload members 60 are exposed to the working bore. In other instances theload members 60 are separated from and secured external to thetubular snubbing structure 11; in such cases theload members 60 being isolated from the working bore. - More particularly, with reference to
FIGS. 2, 6 , 7, and in another embodiment, theload plate 33 is optionally separate, as more clearly illustrated in the identified drawings, from theload spool 20 and, as such, is mechanically fastened to thetubular snubbing structure 11 atflange 35. Separation of theload plate 33 as an independent structure from theload spool 20 provides greater options in selecting material properties for theload plate 33. As discussed, the working bore of thetubular snubbing structure 11 can be in communication with wellbore fluids which dictate selection and restriction of the materials of construction to account of corrosion and related service conditions. Due to the possibility of the presence of hydrogen sulphide (H2S) in the well fluids, the materials of construction of components exposed thereto are typically restricted, and regulated to be conventional carbons steel. For example, all piping and components are firstly to ASTM and ASME standards and secondly those exposed to hydrogen sulfide (H2S) bearing hydrocarbon service are provided accordance with the appropriate requirements of the National Association of Corrosion Engineers (NACE) such as those current set forth in NACE/MR0175. - Accordingly, components which transfer the loads to the
wellhead 12, and which are in contact with well fluids, are typically constructed of conventional materials and are limited to the strength of such suitable materials. Conventionally therefore, greater load carrying capacity is only obtained by using thicker, heavier components. However, material selection can be expanded by removing the structure materials from exposure to the wellbore fluids. - With reference to
FIGS. 6 and 7 , in this embodiment, theload members 60 extend from or are incorporated into one ormore load plates 33 which are discrete components from the tubular snubbing structure and, thus, which are isolated from the wellbore fluids. The one or more load plates are mechanically connected to theouter flange 35 of theload spool 20. - In one arrangement, a
single load plate 33 is formed having acentral port 37 sized to fit about a tubular body portion of theload spool 20 and positionable adjacent theouter flange 35 for bolting connection thereto. Theport 37 of theload plate 33 is fit about theload spool 20 prior to final fitting of spaced-apart, welded flanges, one of which is theflanged connection 35. - The use of the
flanged connection 35 to theload plate 33 in thepresent snubbing unit 10 of the present invention enables clear isolation of the wellbore fluids in the working bore of theload spool 20 and theload plate 33. Thus, the material properties of theload members 60 of theload plate 33 can be engineered to best suit the loads and service life required. For example,load members 60 of conventional mild steel, such as that integral with theload spool 20, may be in the order of 4 inches in thickness so as to accommodate traveling slip assembly loads in the order of 200,000 pounds. However, in the case of a separate, higher-strength load plate 33, bolted exterior to thetubular snubbing structure 11, a suitable required thickness would only be about 2 to 2-½ inches thick with commensurate weight savings of up to 35 to 50%. - With reference to
FIG. 7 , theflanged connections hydraulic actuators 30 andload plate 33 respectively both aid the parallel alignment of thehydraulic actuators 30 and thetubular snubbing structure 11. In particular, thecylinder flanges 34 can be made in controlled manufacturing conditions with appropriate jigs and subsequent stress relief. Thus, thehydraulic actuators 30 can be secured to theload plate 33 and relative to thetubular snubbing structure 11 with precision, thereby minimizing residual stresses, misalignment and resultant operational difficulties such as any detrimental interaction between thehydraulic actuators 30, such as walking of the travelingplate 21. - The
hydraulic actuators 30 also are readily assembled and removed for maintenance through load plate clamps orretainers 41. Best shown inFIGS. 3 and 5 , theload plate 33 is formed with slottedopenings 40 for receiving thecylinders 31. After eachcylinder 31 is set into position in it respective slottedopenings 40 in theload plate 33, theretainer 41 is mechanically secured to sandwich thecylinder 31 therebetween and thereby fix the cylinder's lateral position.Flanges 34 secure the vertical position of thecylinders 31 to theload plate 33. Alternative fitting of thecylinders 31 to theload plate 33 comprise fitting actuator ports in theload plate 33, such as those resulting where the retainer is permanently fixed in theload plate 33, and sliding the cylinders axially through the actuator ports for mechanical fastening to theload plate 33 through theflange 34 or other clamping means. - With particular reference to
FIG. 9 , and as discussed earlier, eachhydraulic actuator 30 comprises thecylinder 31 and therod 32. Thecylinders 31 can comprise anouter barrel 50 within which therod 32 and apiston 51 can reciprocate. As described, a cylinder and rod actuator also represent fairly conventional hydraulic actuators which are also suitable for thepresent snubbing unit 10. However, in a preferred case, therod 32 is hollow and theactuators 30 further comprise aninner barrel 52 which is sealable within therod 32. The use of theinner barrel 52 reduces the actuator's weight significantly due to the removal of the metal mass from the inside therod 32. Further, less hydraulic oil is required to lift therod 32, increasing the speed and volume displacement between a rod side and a blind side of thecylinder 31 can be more equally matched. Also, the diameter of therod 32 and of thecylinder 31 can be increased resulting in a morestable actuator 30 with a higher safety factor while maintaining a similar weight of that of a smaller conventional hydraulic actuator having similar lifting force capabilities. - With reference to
FIGS. 10 a, 10 b,hydraulic actuators 30 of conventional or hollow design are operated to reciprocate the travelingslip assembly 15 between a raised position (FIG. 10 a) and a lowered position (FIG. 10 b). - As a result of incorporating the structure of the raising and lowering
hydraulic actuators 30 as an integral part of the structural design, the snubbingunit 10 has fewer load-bearing components and those few components can be machined with great accuracy (typically 0.005 of an inch). The components can be bolted together allowing the unit to be constructed in less time, reducing the assembly to about one half the conventional time. Without the need for welding, which eliminates the natural stresses inherent in a welded structure, the resulting structure remains true and square. Further, by avoiding combining structural requirements with wellbore-exposed components, and thus avoiding wellbore fluids, a higher strength and thus thinner and lighter engineered material can be used to bear the loads.
Claims (17)
1. A snubbing unit for a wellhead having a wellbore comprising:
a lower connection adapted to the wellhead;
a tubular snubbing structure above the lower connection and having a working bore having a common axis with the wellbore;
a stationary slip assembly supported on the tubular snubbing structure;
a traveling plate movable independently of the tubular snubbing structure and having a traveling slip assembly supported thereon for imparting or receiving snubbing loads;
one or more load members supported by and extending laterally from the tubular snubbing structure; and
a least two actuators positioned parallel to the common axis, each comprising a cylinder and a hydraulically-actuated rod moveable therein, each cylinder being secured intermediate its length to the one or more load members and each rod having a lower end actuable in the cylinder and an upper end secured to the traveling plate wherein, actuation of the rods moves the traveling plate and snubbing loads are transferred through the rods, to the cylinders, to the load members to the tubular snubbing structure.
2. The snubbing unit of claim 1 further comprising a tubular load spool incorporated into the tubular snubbing structure for transferring snubbing loads from the one or more load members.
3. The snubbing unit of claim 2 wherein the load spool further comprises an outer flange isolated from the working bore, the snubbing unit further comprising one or more load plates mechanically connected to the outer flange and wherein the one or more load members extend from or are integral with the one or more load plates.
4. The snubbing unit of claim 3 wherein the one or more load plates are formed of high strength materials.
5. The snubbing unit of claim 1 wherein the one or more load members is a plate sandwiched in the tubular snubbing structure for transferring snubbing loads thereto.
6. The snubbing unit of claim 1 wherein each hydraulic actuator further comprises a mounting flange positioned intermediate along the cylinder for mechanical connection to the one or more load members.
7. The snubbing unit of claim 6 wherein the one or more load members further comprise:
slotted opening in the load member for receiving each cylinder therein,
a corresponding retainer fit to each slotted opening for removeably securing each cylinder to the load member; and
mechanical fasteners for removeably securing each mounting flange to the load member.
8. The snubbing unit of claim 6 wherein the one or more load members further comprise:
an actuator port formed in the load member for receiving each cylinder therein, and
mechanical fasteners for removeably securing each mounting flange to the one or more load members.
9. The snubbing unit of claim 1 wherein each cylinder is secured to one or more load members at about midway along each cylinder's length.
10. The snubbing unit of claim 3 wherein each hydraulic actuator further comprises a mounting flange positioned intermediate along the cylinder for mechanical connection to the one or more load plates.
11. The snubbing unit of claim 10 wherein the one or more load plates further comprise:
slotted opening in the load member for receiving each cylinder therein,
a corresponding retainer fit to each slotted opening for removeably securing each cylinder to the one or more load plates; and
mechanical fasteners for removeably securing each mounting flange to the one or more load plates.
12. The snubbing unit of claim 10 wherein the one or more load plates further comprise:
an actuator port formed in the one or more load plates for receiving each cylinder therein, and
mechanical fasteners for removeably securing each mounting flange to the one or more load plates.
13. The snubbing unit of claim 3 wherein each cylinder is secured to the one or more load plates at about midway along each cylinder's length.
14. The snubbing unit of claim 4 wherein each hydraulic actuator further comprises a mounting flange positioned intermediate along the cylinder for mechanical connection to the one or more load plates.
15. The snubbing unit of claim 14 wherein the one or more load plates further comprise:
slotted opening in the load member for receiving each cylinder therein,
a corresponding retainer fit to each slotted opening for removeably securing each cylinder to the one or more load plates; and
mechanical fasteners for removeably securing each mounting flange to the one or more load plates.
16. The snubbing unit of claim 14 wherein the one or more load plates further comprise:
an actuator port formed in the one or more load plates for receiving each cylinder therein, and
mechanical fasteners for removeably securing each mounting flange to the I one or more load plates.
17. The snubbing unit of claim 4 wherein each cylinder is secured to the one or more load plates at about midway along each cylinder's length.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/002,277 US20060118294A1 (en) | 2004-12-03 | 2004-12-03 | Frameless snubbing unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/002,277 US20060118294A1 (en) | 2004-12-03 | 2004-12-03 | Frameless snubbing unit |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060118294A1 true US20060118294A1 (en) | 2006-06-08 |
Family
ID=36572916
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/002,277 Abandoned US20060118294A1 (en) | 2004-12-03 | 2004-12-03 | Frameless snubbing unit |
Country Status (1)
Country | Link |
---|---|
US (1) | US20060118294A1 (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070261860A1 (en) * | 2005-10-14 | 2007-11-15 | Hallonquist David J | Controlled shared load casing jack system |
WO2009085349A1 (en) * | 2007-12-21 | 2009-07-09 | Services Petroliers Schlumberger | Logging tool deployment systems and methods without pressure compensation |
US20100001238A1 (en) * | 2008-07-07 | 2010-01-07 | 1128971 Alberta Ltd. | Snubbing jack |
US20100193179A1 (en) * | 2009-01-30 | 2010-08-05 | Tucken Brian | Push / pull system and support structure for snubbing unit or the like on a rig floor |
US20100200085A1 (en) * | 2009-02-10 | 2010-08-12 | Honeywell International Inc. | Hydraulic pressure switch with porous disc as snubbing element |
US20100224357A1 (en) * | 2009-03-05 | 2010-09-09 | Rodgers Troy A | Compact snubbing unit |
US20110203820A1 (en) * | 2010-02-23 | 2011-08-25 | Adrian Marica | Track guiding system |
EP2392978A1 (en) * | 2008-06-16 | 2011-12-07 | Halliburton Energy Services, Inc. | Work string controller |
WO2011143571A3 (en) * | 2010-05-14 | 2012-12-20 | Express Energy Services Operating Lp | Pushing or pulling device |
US20130192842A1 (en) * | 2012-01-31 | 2013-08-01 | Cudd Pressure Control, Inc. | Method and Apparatus to Perform Subsea or Surface Jacking |
WO2013015978A3 (en) * | 2011-07-27 | 2013-12-12 | Express Energy Services Operating Lp | Pushing or pulling device |
US20150167446A1 (en) * | 2011-05-05 | 2015-06-18 | Snubco Manufacturing Inc. | System and method for monitoring and controlling snubbing slips |
CN104820372A (en) * | 2015-03-12 | 2015-08-05 | 烟台杰瑞石油装备技术有限公司 | Snubbing unit and real-time monitoring system thereof |
US20170211340A1 (en) * | 2016-01-26 | 2017-07-27 | Jason Alford | Telescoping Snubbing Unit Frame |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1895132A (en) * | 1929-10-21 | 1933-01-24 | Burt S Minor | Snubbing device for oil well tubing |
US3797570A (en) * | 1972-05-08 | 1974-03-19 | Baker Oil Tools Inc | Snubbing apparatus |
US4479547A (en) * | 1981-06-01 | 1984-10-30 | Varco International, Inc. | Well pipe jack |
US4855382A (en) * | 1987-08-04 | 1989-08-08 | Exxon Chemical Patents Inc. | Cross-linkable hot melt adhesive composition |
US6726856B2 (en) * | 2000-10-19 | 2004-04-27 | Merck Patent Gesellschaft | Process for preparing electrically conductive pigments |
-
2004
- 2004-12-03 US US11/002,277 patent/US20060118294A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1895132A (en) * | 1929-10-21 | 1933-01-24 | Burt S Minor | Snubbing device for oil well tubing |
US3797570A (en) * | 1972-05-08 | 1974-03-19 | Baker Oil Tools Inc | Snubbing apparatus |
US4479547A (en) * | 1981-06-01 | 1984-10-30 | Varco International, Inc. | Well pipe jack |
US4855382A (en) * | 1987-08-04 | 1989-08-08 | Exxon Chemical Patents Inc. | Cross-linkable hot melt adhesive composition |
US6726856B2 (en) * | 2000-10-19 | 2004-04-27 | Merck Patent Gesellschaft | Process for preparing electrically conductive pigments |
Cited By (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7578352B2 (en) * | 2005-10-14 | 2009-08-25 | Weatherford/Lamb, Inc. | Controlled shared load casing jack system and method of using |
US20070261860A1 (en) * | 2005-10-14 | 2007-11-15 | Hallonquist David J | Controlled shared load casing jack system |
WO2009085349A1 (en) * | 2007-12-21 | 2009-07-09 | Services Petroliers Schlumberger | Logging tool deployment systems and methods without pressure compensation |
US7896086B2 (en) | 2007-12-21 | 2011-03-01 | Schlumberger Technology Corporation | Logging tool deployment systems and methods without pressure compensation |
EP2392978A1 (en) * | 2008-06-16 | 2011-12-07 | Halliburton Energy Services, Inc. | Work string controller |
EP2392767A1 (en) * | 2008-06-16 | 2011-12-07 | Halliburton Energy Services, Inc. | Work string controller |
US20100001238A1 (en) * | 2008-07-07 | 2010-01-07 | 1128971 Alberta Ltd. | Snubbing jack |
US7766080B2 (en) * | 2008-07-07 | 2010-08-03 | 1128971 Alberta Ltd. | Snubbing jack |
US20100193179A1 (en) * | 2009-01-30 | 2010-08-05 | Tucken Brian | Push / pull system and support structure for snubbing unit or the like on a rig floor |
US8640767B2 (en) * | 2009-01-30 | 2014-02-04 | Team Snubbing Services Inc. | Push / pull system and support structure for snubbing unit on a rig floor |
US20100200085A1 (en) * | 2009-02-10 | 2010-08-12 | Honeywell International Inc. | Hydraulic pressure switch with porous disc as snubbing element |
US8022321B2 (en) | 2009-02-10 | 2011-09-20 | Honeywell International Inc. | Hydraulic pressure switch with porous disc as snubbing element |
WO2010102243A1 (en) * | 2009-03-05 | 2010-09-10 | Rodgers Troy A | Compact snubbing unit |
US8333238B2 (en) | 2009-03-05 | 2012-12-18 | Rodgers Technology, L.L.C. | Compact snubbing unit |
US20100224357A1 (en) * | 2009-03-05 | 2010-09-09 | Rodgers Troy A | Compact snubbing unit |
US20110203820A1 (en) * | 2010-02-23 | 2011-08-25 | Adrian Marica | Track guiding system |
US8424616B2 (en) | 2010-02-23 | 2013-04-23 | National Oilwell Varco, L.P. | Track guiding system |
US9464494B2 (en) | 2010-02-23 | 2016-10-11 | National Oilwell Varco, L.P. | Track guiding system |
WO2011143571A3 (en) * | 2010-05-14 | 2012-12-20 | Express Energy Services Operating Lp | Pushing or pulling device |
US20150167446A1 (en) * | 2011-05-05 | 2015-06-18 | Snubco Manufacturing Inc. | System and method for monitoring and controlling snubbing slips |
WO2013015978A3 (en) * | 2011-07-27 | 2013-12-12 | Express Energy Services Operating Lp | Pushing or pulling device |
US20130192842A1 (en) * | 2012-01-31 | 2013-08-01 | Cudd Pressure Control, Inc. | Method and Apparatus to Perform Subsea or Surface Jacking |
US8863846B2 (en) * | 2012-01-31 | 2014-10-21 | Cudd Pressure Control, Inc. | Method and apparatus to perform subsea or surface jacking |
CN104820372A (en) * | 2015-03-12 | 2015-08-05 | 烟台杰瑞石油装备技术有限公司 | Snubbing unit and real-time monitoring system thereof |
US20170211340A1 (en) * | 2016-01-26 | 2017-07-27 | Jason Alford | Telescoping Snubbing Unit Frame |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20060118294A1 (en) | Frameless snubbing unit | |
US9598918B2 (en) | Tubular handling system | |
US7219739B2 (en) | Heave compensation system for hydraulic workover | |
US7314087B2 (en) | Heave compensation system for hydraulic workover | |
US4715456A (en) | Slips for well pipe | |
US7337849B2 (en) | Co-linear tensioner and methods of installing and removing same | |
US9657539B2 (en) | Automated roughneck | |
US6142233A (en) | Tree running tool with actuator for latch | |
EP0611085B1 (en) | Bore selector for a subsea wellhead | |
EP1316671B1 (en) | Co-linear tensioner and methods for assembling production and drilling risers using same | |
US7392864B2 (en) | Slip spool assembly and method of using same | |
US6695064B2 (en) | Slip spool and method of using same | |
US20040262015A1 (en) | Convertible jack | |
US6062312A (en) | Tree running tool with emergency release | |
US20120292037A1 (en) | Adjustment and restraint system for subsea flex joint | |
US20030116326A1 (en) | Slip spool and method of using same | |
CA2528161C (en) | Apparatus and method of manufacturing a frameless snubbing unit | |
CA3083129A1 (en) | Integrated snubbing operating platform | |
US7520334B2 (en) | Subsurface lubricator and method of use | |
CA2512264C (en) | Slip spool assembly and method of using same | |
CA2993795C (en) | Large diameter tubular lifting apparatuses and methods | |
CN105452591B (en) | Elevator for drilling rig |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |