WO1998000626A1 - Method for expanding a steel tubing and well with such a tubing - Google Patents

Method for expanding a steel tubing and well with such a tubing Download PDF

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Publication number
WO1998000626A1
WO1998000626A1 PCT/EP1997/003489 EP9703489W WO9800626A1 WO 1998000626 A1 WO1998000626 A1 WO 1998000626A1 EP 9703489 W EP9703489 W EP 9703489W WO 9800626 A1 WO9800626 A1 WO 9800626A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubing
expansion
expanded
steel
mandrel
Prior art date
Application number
PCT/EP1997/003489
Other languages
French (fr)
Inventor
Martin Donnelly
Alban Michel Faure
Franz Marketz
Robert Bruce Stewart
Wilhelmus Christianus Maria Lohbeck
Original Assignee
Shell Internationale Research Maatschappij B.V.
Shell Canada Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shell Internationale Research Maatschappij B.V., Shell Canada Limited filed Critical Shell Internationale Research Maatschappij B.V.
Priority to DE69739166T priority Critical patent/DE69739166D1/en
Priority to CA002260191A priority patent/CA2260191C/en
Priority to JP50385298A priority patent/JP4289686B2/en
Priority to EP97930490A priority patent/EP0907822B1/en
Priority to DK97930490T priority patent/DK0907822T3/en
Priority to NZ333945A priority patent/NZ333945A/en
Priority to BR9710016A priority patent/BR9710016A/en
Priority to AU34420/97A priority patent/AU723337B2/en
Priority to EA199900072A priority patent/EA000543B1/en
Publication of WO1998000626A1 publication Critical patent/WO1998000626A1/en
Priority to NO19986171A priority patent/NO317755B1/en

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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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02—Subsoil filtering
    • E21B43/10—Setting of casings, screens, liners or the like in wells
    • E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like
    • E21B43/105—Expanding tools specially adapted therefor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
    • C21D7/12—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars by expanding tubular bodies
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings

Definitions

  • the invention relates to expansion of tubings. More particularly the invention relates to a method of expanding a steel tubing by moving an expansion mandrel through the tubing. Numerous methods and devices are known for expansion of tubings.
  • European patent specification 643794 discloses a method of expanding a casing against the wall of an underground borehole wherein the casing is made of a malleable material which preferably is capable of plastic deformation of at least 25% unaxial strain and the casing may be expanded by an expansion mandrel which is pumped, pulled or pushed through the casing.
  • corrugated or slotted pipes serves to reduce the expansion forces that need to be exerted to the tube to create the desired expansion.
  • the method according to the invention comprises the step of moving an expansion mandrel through the tubing thereby plastically expanding the tubing, wherein an at least partly solid tubing is expanded which is made of a formable steel grade which is subject to strain hardening without incurring any necking and ductile fracturing as a result of the expansion process and an expansion mandrel is used which has along at least part of its length a tapering non-metallic surface.
  • strain-hardening and work-hardening are synonyms and are both used to denote an increase of strength caused by plastic deformation.
  • formable steel grade as used in this specification means that the tubing is able to maintain its structural integrity while being plastically deformed into various shapes .
  • necking refers to a geometrical effect leading to non-uniform plastic deformations at some location by occurrence of a local constriction. From the point of necking on, the continual work hardening in the necked region no longer compensates for the continual reduction of the smallest cross-section in the neck, and therefore, the load carrying capacity of the steel decreases. With continuing loading, practically all further plastic deformation is restricted to the region of the neck, so that a highly non-uniform deformation occurs to develop in the necked region until fracture occurs .
  • ductile fracturing means that a failure occurs if plastic deformation of a component that exhibits ductile behaviour is carried to the extreme so that the component separates locally into two pieces. Nucleation, growth and coalescence of internal voids propagate to failure, leaving a dull fibrous rupture surface.
  • necking and ductile fracturing is given in the handbook "Failure of Materials in Mechanical Design” by J.A. Collins second edition, issued by John Wiley and Sons, New York (USA) in 1993.
  • the tubing is made of a high-strength steel grade with formability and having a yield strength- tensile strength ratio which is lower than 0.8 and a yield strength of at least 275 MPa .
  • high-strength steel denotes a steel with a yield strength of at least 275 MPa .
  • tubing is made of a formable steel grade having a yield stress/tensile stress ratio which is between 0.6 and 0.7.
  • Dual phase (DP) high-strength, low-alloy (HSLA) steels lack a definite yield point which eliminates Luders band formation during the tubular expansion process which ensures good surface finish of the expanded tubular.
  • Suitable HSLA dual phase (DP) steels for use in the method according to the invention are grades DP55 and DP60 developed by Sollac having a tensile strength of at least 550 Mpa and grades SAFH 540 D and SAFH 590 D developed by Nippon Steel Corporation having a tensile strength of at least 540 MPa.
  • suitable steels are the following formable high-strength steel grades an ASTM A106 high-strength low alloy (HSLA) seamless pipe; an ASTM A312 austemtic stainless steel pipe, grade
  • the above-mentioned DP and other suitable steels each have a strain hardening exponent n of at least 0.16 which allows an expansion of the tubing such that the external diameter of the expanded tubing is at least 20% larger than the external diameter of the unexpanded tubing.
  • a strain hardening exponent n of at least 0.16 which allows an expansion of the tubing such that the external diameter of the expanded tubing is at least 20% larger than the external diameter of the unexpanded tubing.
  • the expansion mandrel contains an expansion section that has a conical ceramic outer surface. If the expansion mandrel is pumped through the tubing then the mandrel preferably comprises a sealing section which is located at such a distance from the tapering expansion section that when the expansion mandrel is moved through the tubing by means of exerting a hydraulic pressure behind the mandrel the sealing section engages a plastically expanded part of the tubing. This will generally be achieved if said distance is at least three times the wall thickness of the expanded tubing.
  • the expansion mandrel contains a vent line for venting to the surface any fluids that are present in the borehole and tubing ahead of the expansion mandrel.
  • the tubing is expanded such that the outer diameter of the expanded tubing is slightly smaller than the internal diameter of the borehole or of any casing that is present in the borehole and any fluids that are present in the borehole and tubing ahead of the expansion mandrel are vented to surface via the annular space that remains open around the tubing after the expansion process.
  • the invention also relates to a well provided with a tubing which is expanded using the method according to the invention.
  • the tubing may serve as production tubing through which hydrocarbon fluid is transported to the surface and a reelable service and/or kill line passes through at least a substantial part of the length of the tubing, through which line fluid can be pumped towards the bottom of the borehole while hydrocarbon fluid is produced via the surrounding production tubing.
  • tubing allows the use of almost the full wellbore for the transport of hydrocarbon fluids so that a relatively slim borehole may be utilized to attain the desired production rate .
  • the tubing may be expanded against the inner surface of a casing which is present in the borehole.
  • the tubing may either be used as a production tubing and/or as a protective cladding for protecting the well casing against corrosive well fluids and damage from tools that may be lowered into the well during maintenance and workover operations.
  • FIG. 1 is schematic longitudinal sectional view of an underground borehole in which a tubing is expanded in accordance with the method according to the invention.
  • a borehole traversing an underground formation 1 and a casing 2 that is fixed within the borehole by means of an annular body of cement 3.
  • a production tubing 4 which is made of a dual phase, high-strength low-alloy (HSLA) steel or other formable high-strength steel is suspended within the casing 2.
  • An expansion mandrel 5 is moved in longitudinal direction through the tubing 4 thereby expanding the tubing 4 such that the outer diameter of the expanded tubing is slightly smaller than or is about equal to the internal diameter of the casing 2.
  • HSLA high-strength low-alloy
  • the expansion mandrel 5 is equipped with a series of ceramic surfaces 6 which restrict frictional forces between the pig and tubing 4 during the expansion process.
  • the semi top angle A of the conical ceramic surface that actually expands the tubing is about 25°.
  • zirconium oxide is a suitable ceramic material which can be formed as a smooth conical ring. Experiments and simulations have shown that if the semi cone top angle A is between 20° and 30° the pipe deforms such that it obtains an S-shape and touches the tapering part of the ceramic surface 6 essentially at the outer tip or rim of said conical part and optionally also about halfway the conical part.
  • said semi top angle A is smaller than 15° this results in relatively h gh frictional forces between the tube and pig, whereas is said top angle is larger than 30° this will involve redundant plastic work due to plastic bending of the tubing 4 which also leads to higher heat dissipation and to disruptions of the forward movement of the pig 5 through the tubing 4.
  • said seiru top angle A is preferably selected between 15° and 30° and should always be between 5° and 45°.
  • the tapering part of the expansion mandrel 5 should have a non-metallic outer surface to avoid galling of the tubing during the expansion process.
  • the expansion mandrel 5 provided with a ceramic tapering surface 6 could expand a tubing 5 made of a formable steel such that the outer tubing diameter D2 after expansion was at least 20% larger than the outer diameter Dl of the unexpended tubing and that suitable formable steels are dual phase (DP) high-strength low alloy (HSLA) steels known as DP55 and DP60; ASTM A106 HSLA seamless pipe, ASTM A312 austemtic stainless steel pipes, grades TP 304 L and TP 316 L and a high-retained auste te high- strength hot rolled steel, known as TRIP steel manufactured by the Nippon Steel Corporation.
  • DP dual phase
  • HSLA high-strength low alloy
  • the mandrel 5 is provided with a pair of sealing rings 7 which are located at such a distance from the conical ceramic surface 6 that the rings 7 face the plastically expanded section of the tubing .
  • the sealing rings serve to avoid that fluid at high hydraulic pressure would be present between the conical ceramic surface 6 of the mandrel 5 and the expanding tubing 4 which might lead to an irregularly large expansion of the tubing 4.
  • the expansion mandrel 5 is provided with a central vent passage 7 which is in communication with a coiled vent line 8 through which fluid may be vented to the surface.
  • the pig 5 may be pulled up to surface by the vent line and a coiled kill and/or service line (not shown) may be lowered into the expanded tubing 4 to facilitate injection of kill and/or treatment fluids towards the hydrocarbon fluid inflow zone which is normally be done via the annulus between the production tubing and the well casing.
  • a coiled kill and/or service line (not shown) may be lowered into the expanded tubing 4 to facilitate injection of kill and/or treatment fluids towards the hydrocarbon fluid inflow zone which is normally be done via the annulus between the production tubing and the well casing.
  • the tubing 4 is expanded to a smaller diameter then the residual annular space between the casing 2 and expanded tubing 4 can be used for venting of fluids during the expansion process and for injection of fluids during the production process, in which case there is no need for using a vent line 8 and kill and/or service lines.
  • the mandrel can also be pulled through the tubing by means of a cable or pushed through the tubing by means of pipe string or rod.
  • the method according to the invention can also be used to expand tubings that are used outside a wellbore, for example to expand oilfield tubulars at surface facilities or to expand a tubing inside an existing tubing which has been damaged or corroded.
  • the expansion mandrel was designed such that the outer diameter of the expanded tubular would be 127 mm, so that the increase in diameter would be 20%.
  • the tubular burst during the expansion process. Analysis showed that the ductility limit of the material had been exceeded so that ductile fracturing occurred.
  • An expansion mandrel was pumped through the pipe, which mandrel comprised a ceramic conical surface such that the semi top angle A of a cone enveloping the conical surface was 20° and such that the outer diameter of the expanded pipe was 127 mm (5") and the outer diameter increased by 21%.
  • the pipe was expanded successfully and the hydraulic pressure exerted to the mandrel to move the mandrel through the pipe was between 275 and 300 bar.
  • the burst pressure of the expanded pipe was between 520 and 530 bar.

Abstract

A tubing (4) made of a formable steel grade which is subject to strain hardening without incurring any necking or ductile fracturing as a result of the expansion process is expanded by moving an expansion mandrel (5) having a non-metallic tapering outer surface through the tubing, thereby increasing the strength of the tubing while expansion forces remains low.

Description

METHOD FOR EXPANDING A STEEL TUBING AND WELL WITH SUCH A TUBING
The invention relates to expansion of tubings. More particularly the invention relates to a method of expanding a steel tubing by moving an expansion mandrel through the tubing. Numerous methods and devices are known for expansion of tubings.
European patent specification 643794 discloses a method of expanding a casing against the wall of an underground borehole wherein the casing is made of a malleable material which preferably is capable of plastic deformation of at least 25% unaxial strain and the casing may be expanded by an expansion mandrel which is pumped, pulled or pushed through the casing.
Other expansion methods and devices are disclosed in German patent specification No. 1583992 and in US patent specification Nos. 3,203-483; 3-162,245; 3,167,122; 3,326,293; 3,785,193; 3,489,220; 5,014,779; 5,031,699; 5,083, 608 and 5,366,012.
Many of the known expansion methods employ an initially corrugated tube and the latter prior art reference employs a slotted tube which is expanded downhole by an expansion mandrel.
The use of corrugated or slotted pipes in the known methods serves to reduce the expansion forces that need to be exerted to the tube to create the desired expansion.
It is an object of the present invention to provide a method for expanding an at least partly solid, i.e. unslotted, tubing which requires exertion of a low force to expand the tubing and which provides a tubing having a larger diameter and higher strength than the unexpanded tubing and which can be carried out with a tubing which already may have a tubular shape before expansion. The method according to the invention thereto comprises the step of moving an expansion mandrel through the tubing thereby plastically expanding the tubing, wherein an at least partly solid tubing is expanded which is made of a formable steel grade which is subject to strain hardening without incurring any necking and ductile fracturing as a result of the expansion process and an expansion mandrel is used which has along at least part of its length a tapering non-metallic surface.
As a result of strain hardening the tubing becomes stronger during the expansion process since for any further increment of expansion always a higher stress is required than for the preceding expansion.
It has been found that the use of a formable steel grade for the tubing in combination with a non-metallic tapering surface of the expansion mandrel has a synerge- tic effect since the resulting expanded tubing will have an adequately increased strength while the expansion forces remain low. The low yield strength and high ductility of the tubing before expansion enables, if the tubing is to be used in an underground borehole, the use of a tubing which is reeled from a reeling drum into the borehole .
It is observed that in the art of metallurgy the terms strain-hardening and work-hardening are synonyms and are both used to denote an increase of strength caused by plastic deformation.
The term formable steel grade as used in this specification means that the tubing is able to maintain its structural integrity while being plastically deformed into various shapes .
Ways of determining forming characteristics of a steel are set out in the Metals Handbook, 9th edition, volume 14, Forming and Forging, issued by ASM International, Metals Park, Ohio (USA) .
The term necking refers to a geometrical effect leading to non-uniform plastic deformations at some location by occurrence of a local constriction. From the point of necking on, the continual work hardening in the necked region no longer compensates for the continual reduction of the smallest cross-section in the neck, and therefore, the load carrying capacity of the steel decreases. With continuing loading, practically all further plastic deformation is restricted to the region of the neck, so that a highly non-uniform deformation occurs to develop in the necked region until fracture occurs .
The term ductile fracturing means that a failure occurs if plastic deformation of a component that exhibits ductile behaviour is carried to the extreme so that the component separates locally into two pieces. Nucleation, growth and coalescence of internal voids propagate to failure, leaving a dull fibrous rupture surface. A detailed description of the terms necking and ductile fracturing is given in the handbook "Failure of Materials in Mechanical Design" by J.A. Collins second edition, issued by John Wiley and Sons, New York (USA) in 1993. Preferably the tubing is made of a high-strength steel grade with formability and having a yield strength- tensile strength ratio which is lower than 0.8 and a yield strength of at least 275 MPa . When used in this specification, the term high-strength steel denotes a steel with a yield strength of at least 275 MPa .
It is also preferred that the tubing is made of a formable steel grade having a yield stress/tensile stress ratio which is between 0.6 and 0.7.
Dual phase (DP) high-strength, low-alloy (HSLA) steels lack a definite yield point which eliminates Luders band formation during the tubular expansion process which ensures good surface finish of the expanded tubular.
Suitable HSLA dual phase (DP) steels for use in the method according to the invention are grades DP55 and DP60 developed by Sollac having a tensile strength of at least 550 Mpa and grades SAFH 540 D and SAFH 590 D developed by Nippon Steel Corporation having a tensile strength of at least 540 MPa.
Other suitable steels are the following formable high-strength steel grades an ASTM A106 high-strength low alloy (HSLA) seamless pipe; an ASTM A312 austemtic stainless steel pipe, grade
TP 304 L; an ASTM A312 austemtic stainless steel pipe, grade
TP 316 L; and - a high-retained austemte high-strength hot-rolled steel (low-alloy TRIP steel) such as grades
SAFH 590 E, SAFH 690 E and SAFH 780 E developed by
Nippon Steel Corporation.
The above-mentioned DP and other suitable steels each have a strain hardening exponent n of at least 0.16 which allows an expansion of the tubing such that the external diameter of the expanded tubing is at least 20% larger than the external diameter of the unexpanded tubing. Detailed explanations of the terms strain hardening, work hardening and the strain hardening exponent n are given in chapters 3 and 17 of the handbook "Metal Forming-Mechanics and Metallurgy", 2nd edition, issued by Prentice Hall, New Jersey (USA), 1993.
Suitably, the expansion mandrel contains an expansion section that has a conical ceramic outer surface. If the expansion mandrel is pumped through the tubing then the mandrel preferably comprises a sealing section which is located at such a distance from the tapering expansion section that when the expansion mandrel is moved through the tubing by means of exerting a hydraulic pressure behind the mandrel the sealing section engages a plastically expanded part of the tubing. This will generally be achieved if said distance is at least three times the wall thickness of the expanded tubing.
The use of a ceramic conical surface reduces friction forces during the expansion process and by having a sealing section which engages the expanded tube it is avoided that hydraulic forces would result in an excessive expansion of the tubing.
In such case it is preferred that the expansion mandrel contains a vent line for venting to the surface any fluids that are present in the borehole and tubing ahead of the expansion mandrel.
Alternatively the tubing is expanded such that the outer diameter of the expanded tubing is slightly smaller than the internal diameter of the borehole or of any casing that is present in the borehole and any fluids that are present in the borehole and tubing ahead of the expansion mandrel are vented to surface via the annular space that remains open around the tubing after the expansion process. The invention also relates to a well provided with a tubing which is expanded using the method according to the invention. In such case the tubing may serve as production tubing through which hydrocarbon fluid is transported to the surface and a reelable service and/or kill line passes through at least a substantial part of the length of the tubing, through which line fluid can be pumped towards the bottom of the borehole while hydrocarbon fluid is produced via the surrounding production tubing. The use of such an expanded production tubing allows the use of almost the full wellbore for the transport of hydrocarbon fluids so that a relatively slim borehole may be utilized to attain the desired production rate . Alternatively the tubing may be expanded against the inner surface of a casing which is present in the borehole. In such case the tubing may either be used as a production tubing and/or as a protective cladding for protecting the well casing against corrosive well fluids and damage from tools that may be lowered into the well during maintenance and workover operations.
These and other objects, features and advantages of the method and well system according to the present invention will be apparent from the accompanying claims, abstract and the following detailed description with reference to the accompanying drawing, in which Fig. 1 is schematic longitudinal sectional view of an underground borehole in which a tubing is expanded in accordance with the method according to the invention. Now referring to Fig. 1, there is shown a borehole traversing an underground formation 1 and a casing 2 that is fixed within the borehole by means of an annular body of cement 3. A production tubing 4 which is made of a dual phase, high-strength low-alloy (HSLA) steel or other formable high-strength steel is suspended within the casing 2. An expansion mandrel 5 is moved in longitudinal direction through the tubing 4 thereby expanding the tubing 4 such that the outer diameter of the expanded tubing is slightly smaller than or is about equal to the internal diameter of the casing 2.
The expansion mandrel 5 is equipped with a series of ceramic surfaces 6 which restrict frictional forces between the pig and tubing 4 during the expansion process. In the example shown the semi top angle A of the conical ceramic surface that actually expands the tubing is about 25°. It has been found that zirconium oxide is a suitable ceramic material which can be formed as a smooth conical ring. Experiments and simulations have shown that if the semi cone top angle A is between 20° and 30° the pipe deforms such that it obtains an S-shape and touches the tapering part of the ceramic surface 6 essentially at the outer tip or rim of said conical part and optionally also about halfway the conical part.
The experiments also showed that it is beneficial that the expanding tubing 4 obtains an S-shape since this reduces the length of the contact surface between the tapering part of the ceramic surface 6 and the tubing 4 and thereby also reduces the amount of friction between the expansion mandrel 5 and the tubing .
Experiments have also shown that if said semi top angle A is smaller than 15° this results in relatively h gh frictional forces between the tube and pig, whereas is said top angle is larger than 30° this will involve redundant plastic work due to plastic bending of the tubing 4 which also leads to higher heat dissipation and to disruptions of the forward movement of the pig 5 through the tubing 4. Hence said seiru top angle A is preferably selected between 15° and 30° and should always be between 5° and 45°. Experiments have also shown that the tapering part of the expansion mandrel 5 should have a non-metallic outer surface to avoid galling of the tubing during the expansion process. The use of a ceramic surface for the tapering part of the expansion mandrel furthermore caused the average roughness of the inner surface of the tubing 4 to decrease as a result of the expansion process. The experiments have also shown that the expansion mandrel 5 provided with a ceramic tapering surface 6 could expand a tubing 5 made of a formable steel such that the outer tubing diameter D2 after expansion was at least 20% larger than the outer diameter Dl of the unexpended tubing and that suitable formable steels are dual phase (DP) high-strength low alloy (HSLA) steels known as DP55 and DP60; ASTM A106 HSLA seamless pipe, ASTM A312 austemtic stainless steel pipes, grades TP 304 L and TP 316 L and a high-retained auste te high- strength hot rolled steel, known as TRIP steel manufactured by the Nippon Steel Corporation.
The mandrel 5 is provided with a pair of sealing rings 7 which are located at such a distance from the conical ceramic surface 6 that the rings 7 face the plastically expanded section of the tubing . The sealing rings serve to avoid that fluid at high hydraulic pressure would be present between the conical ceramic surface 6 of the mandrel 5 and the expanding tubing 4 which might lead to an irregularly large expansion of the tubing 4. The expansion mandrel 5 is provided with a central vent passage 7 which is in communication with a coiled vent line 8 through which fluid may be vented to the surface. After completion of the expansion process the pig 5 may be pulled up to surface by the vent line and a coiled kill and/or service line (not shown) may be lowered into the expanded tubing 4 to facilitate injection of kill and/or treatment fluids towards the hydrocarbon fluid inflow zone which is normally be done via the annulus between the production tubing and the well casing. However, if the tubing 4 is expanded to a smaller diameter then the residual annular space between the casing 2 and expanded tubing 4 can be used for venting of fluids during the expansion process and for injection of fluids during the production process, in which case there is no need for using a vent line 8 and kill and/or service lines.
In conventional wells it is often necessary to use a production tubing having an outer diameter which is less than 50% of the inner diameter of the well casing to enable a smooth insertion of the tubing even if the well is deviated and the casing has an irregular inner surface. Therefore it is apparent that the in-situ tubing expansion method according to the present invention enhances an efficient use of the wellbore.
It will be understood that instead of moving the expansion mandrel through the tubing by means of hydraulic pressure, the mandrel can also be pulled through the tubing by means of a cable or pushed through the tubing by means of pipe string or rod.
The method according to the invention can also be used to expand tubings that are used outside a wellbore, for example to expand oilfield tubulars at surface facilities or to expand a tubing inside an existing tubing which has been damaged or corroded.
The invention will now be further described on the basis of the following comparative experiments. Experiment 1
An expansion mandrel having a conical ceramic surface (semi top angle A of cone = 20°) was moved through a conventional oil field tubular, known as casing grade L80 13% Cr, which is a widely used casing type, having an initial outer diameter of 101.6 mm (4"), an initial wall thickness of 5.75 mm, a burst pressure of 850 bar and a strain hardening exponent n = 0.075. The expansion mandrel was designed such that the outer diameter of the expanded tubular would be 127 mm, so that the increase in diameter would be 20%. The tubular burst during the expansion process. Analysis showed that the ductility limit of the material had been exceeded so that ductile fracturing occurred. Experiment 2 An experiment was carried out with a coiled tubing of the type QT-800 which is increasingly used as a production tubing in oil or gas wells. The tubing had an initial outer diameter of 60.3 mm, a wall thickness of 5.15 mm, a burst pressure of 800 bar and a strain hardening exponent n = 0.14. An expansion mandrel was moved through the tubing which mandrel comprised a conical ceramic surface such that the semi top angle A of a cone enveloping the conical surface was 5° and which was designed such that the outer diameter of the expanded tubing would be 73 mm (increase of about 21%) . This tubing burst during the expansion process. Analysis revealed that due to high friction forces the expansion pressure had exceeded the burst pressure of the pipe during the expansion process. Experiment 3
An experiment was carried out with a seemless pipe made of a formable steel grade known as ASTM
A 106 Grade B. The pipe had an initial outer diameter of 101.6 mm (4"), an initial wall thickness of 5.75 mm and a strain hardening exponent n = 0.175.
An expansion mandrel was pumped through the pipe, which mandrel comprised a ceramic conical surface such that the semi top angle A of a cone enveloping the conical surface was 20° and such that the outer diameter of the expanded pipe was 127 mm (5") and the outer diameter increased by 21%. The pipe was expanded successfully and the hydraulic pressure exerted to the mandrel to move the mandrel through the pipe was between 275 and 300 bar. The burst pressure of the expanded pipe was between 520 and 530 bar.

Claims

C L A I M S
1. A method of expanding a steel tubing, the method comprising the step of moving an expansion mandrel through the tubing thereby plastically expanding the tubing, wherein an at least partly solid tubing is expanded which is made of a formable steel grade which is subject to strain hardening without incurring any necking and ductile fracturing as a result of the expansion process and an expansion mandrel is used which has along at least part of its length a tapering non-metallic surface.
2. The method of claim 1, wherein the tubing is made of a formable steel grade having a yield strength-tensile strength ratio which is lower than 0.8 and a yield strength of at least 275 MPa . 3. The method of claim 1 or 2 , wherein the tubing is made of a steel having a yield strength-tensile strength ratio which is between 0.6 and 0.7.
4. The method of claim 1, 2 or 3, wherein the tubing is made of a dual phase (DP) high-strength low alloy (HSLA) steel.
5. The method of claim 4, wherein the tubing is made of Sollac grade DP55 or DP60 having a tensile strength of at least 550 Mpa or Nippon grade SAFH 540 D or SAFH 590 D.
6. The method of claim 1, 2 or 3 wherein the tubing is made of a formable high-strength steel grade which is selected from the following group of steel grades : an ASTM A106 high-strength low alloy (HSLA) seamless pipe; an ASTM A312 austenitic stainless steel pipe, grade TP 304 L; an ASTM A312 austenitic stainless steel pipe, grade TP 316 L; and - a high-retained austenite high-strength hot rolled steel which is known as TRIP steel.
7. The method of any preceding claim, wherein the tubing is expanded such that the external diameter of the expanded tubing is at least 20% larger than the external diameter of the unexpanded tubing and wherein the strain hardening exponent n of the formable steel of the tubing is at least 0.16.
8. The method of any preceding claim, wherein the expansion mandrel comprises a tapering expansion section which has a smooth ceramic outer surface which is oriented at an acute angle A which is between 5° and 45° with respect to a longitudinal axis of the mandrel and which induces the tubing to expand without inducing any galling of the tubing and such that the average roughness of the inner surface of the tubing decreases as a result of the expansion process.
9. The method of claim 8, wherein the ceramic outer surface of the tapering expansion section is made of zirconium oxide and is oriented at an acute angle A which is between 15° and 30° with respect to a longitudinal axis of the mandrel.
11. The method of any preceding claim, wherein the tubing is expanded by pumping the expansion mandrel through the tubing . 12. The method of claim 7 and 11, wherein the expansion mandrel comprises a sealing section which is located at such a distance from the expansion section that when the expansion mandrel is pumped through the tubing the sealing section engages a plastically expanded part of the tubing.
13. The method of claim 11 or 12, wherein the tubing is expanded inside an underground borehole and the expansion mandrel contains a vent line for venting any fluids that are present in the tubing ahead of the expansion mandrel to the surface.
14. The method of claim 11 or 12, wherein the tubing is expanded inside an underground borehole such that the outer diameter of the expanded tubing is slightly smaller than the internal diameter of the borehole or of any casing that is present in the borehole and any fluids that are present in the borehole and tubing ahead of the expansion mandrel are vented to surface via the annular space that remains open around the tubing after the expansion process.
15. The method of any preceding claim, wherein the tubing is lowered into an underground borehole after reeling the tubing from a reeling drum. 16. A well provided with a tubing which is expanded using the method of any preceding claim, wherein the tubing serves as a production tubing through which hydrocarbon fluid is transported to the surface and a reelable service and/or kill line passes through at least a substantial part of the length of the interior of the tubing, through which line fluid can be pumped towards the bottom of the borehole while hydrocarbon fluid is produced via the surrounding production tubing. 17. A well provided with a tubing which is expanded using the method according to any one of claims 1-13, wherein the tubing is expanded against the inner surface of a casing which is present in the borehole.
PCT/EP1997/003489 1996-07-01 1997-06-30 Method for expanding a steel tubing and well with such a tubing WO1998000626A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
DE69739166T DE69739166D1 (en) 1996-07-01 1997-06-30 METHOD FOR INCREASING A STEEL TUBE AND A DRILLING OUTER EQUIPPED WITH SUCH A TUBE
CA002260191A CA2260191C (en) 1996-07-01 1997-06-30 Method for expanding a steel tubing and well with such a tubing
JP50385298A JP4289686B2 (en) 1996-07-01 1997-06-30 Method for extending steel tubing and wells having such tubing
EP97930490A EP0907822B1 (en) 1996-07-01 1997-06-30 Method for expanding a steel tubing and well with such as tubing
DK97930490T DK0907822T3 (en) 1996-07-01 1997-06-30 A method of extending a steel pipe and a fire with such a pipe
NZ333945A NZ333945A (en) 1996-07-01 1997-06-30 Expanding steel tubing with a mandrel having a tapered expansion section and well with such tubing
BR9710016A BR9710016A (en) 1996-07-01 1997-06-30 Process of expanding a steel pipe and well provided with a pipe
AU34420/97A AU723337B2 (en) 1996-07-01 1997-06-30 Method for expanding a steel tubing and well with such a tubing
EA199900072A EA000543B1 (en) 1996-07-01 1997-06-30 Method for expanding a steel tubing and well with such a tubing
NO19986171A NO317755B1 (en) 1996-07-01 1998-12-29 Method of expanding a stable rudder and well with such a rudder

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP96201809.9 1996-07-01
EP96201809 1996-07-01

Publications (1)

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WO1998000626A1 true WO1998000626A1 (en) 1998-01-08

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Country Status (14)

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EP (1) EP0907822B1 (en)
JP (1) JP4289686B2 (en)
AU (1) AU723337B2 (en)
BR (1) BR9710016A (en)
CA (1) CA2260191C (en)
DE (1) DE69739166D1 (en)
DK (1) DK0907822T3 (en)
EA (1) EA000543B1 (en)
ID (1) ID17661A (en)
MY (1) MY116920A (en)
NO (1) NO317755B1 (en)
NZ (1) NZ333945A (en)
OA (1) OA10949A (en)
WO (1) WO1998000626A1 (en)

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AU723337B2 (en) 2000-08-24
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NO986171D0 (en) 1998-12-29
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ID17661A (en) 1998-01-15
JP2001508144A (en) 2001-06-19
JP4289686B2 (en) 2009-07-01
EA199900072A1 (en) 1999-06-24
EP0907822A1 (en) 1999-04-14
NO317755B1 (en) 2004-12-13
AU3442097A (en) 1998-01-21
NZ333945A (en) 2000-03-27
EP0907822B1 (en) 2008-12-17
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EA000543B1 (en) 1999-10-28
CA2260191A1 (en) 1998-01-08

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