US20060096785A1 - Expandable bit - Google Patents
Expandable bit Download PDFInfo
- Publication number
- US20060096785A1 US20060096785A1 US10/526,360 US52636005A US2006096785A1 US 20060096785 A1 US20060096785 A1 US 20060096785A1 US 52636005 A US52636005 A US 52636005A US 2006096785 A1 US2006096785 A1 US 2006096785A1
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- US
- United States
- Prior art keywords
- drill bit
- arm
- mandrel
- bit
- cutter face
- 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
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 15
- 238000005553 drilling Methods 0.000 claims abstract description 15
- 239000012530 fluid Substances 0.000 claims description 29
- 238000004140 cleaning Methods 0.000 claims description 4
- 230000001050 lubricating effect Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
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- 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
- E21B10/00—Drill bits
- E21B10/64—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe
- E21B10/66—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe the cutting element movable through the drilling pipe and laterally shiftable
Abstract
A bit has been invented that is expandable from a collapsed position, useful for tripping, to an radially expanded position for use. The bit is useful to form a borehole through an earthen formation. In one embodiment, the bit can be used alone, without a separate under reamer, to expand a well bore below a casing string, either during casing drilling or when extending a well bore below an installed casing string. The bit cutter face includes a center cutter face on a mandrel and an outer cutter face mounted on an expandable section of a housing disposed about the mandrel. The outer cutter face can be expanded by axial movement of the mandrel within the housing.
Description
- This invention is directed to a drill bit for use in drilling a borehole through an earthen formation and, in particular, a drill bit that is expandable from a tripping position to a position for use.
- A drill bit is used when drilling a borehole through an earthen formation. In some applications, such as casing drilling or extending a borehole below a cased section, the drill bit must be sized to fit through the casing drift diameter, but capable of drilling a borehole to a gauge larger than the outer diameter of the casing. To achieve this, an under reamer is often used with a pilot bit.
- The under reamer is spaced back from the pilot bit and is generally pivotally attached such that it can be stored for tripping and expanded radially outwardly for use.
- A bit has been invented that is expandable from a collapsed position, useful for tripping, to an radially expanded position for use. The bit is useful to form a borehole through an earthen formation. In one embodiment, the bit can be used alone, without a separate under reamer, to expand a well bore below a casing string, either during casing drilling or when extending a well bore below an installed casing string.
- In accordance with one broad aspect of the present invention there is provided a drill bit for forming a borehole through an earthen formation, the drill bit comprising: an upper end formed to be connectable to a drilling drive means, a lower end opposite the upper end; a center axis extending between the upper end and the lower end; a center cutter face on the lower end, the center cutter face selected to be useful to drill through an earthen formation; and an arm positioned between the center cutter face and the upper end, the arm selected to be radially moveable relative to the center axis between a stored position defining a stored bit diameter and an expanded position defining an expanded bit diameter, greater than the stored bit diameter; and an outer cutter face disposed on the arm and exposable for use to drill through an earthen formation when the arm is in the expanded position.
- The drilling drive means to which the upper end is connectable can vary depending on the type of drilling in which the bit is to be used. For example, the drilling drive means can be: a drill string formed of, for example, drill pipe or casing; a sub connectable to a drill string; a downhole motor, such as for example, a mud motor, for driving the bit; or a sub connected to a downhole motor.
- The bit can include one or more arms, with consideration as to size and complexity of the bit. In the stored position, the bit is generally selected to be a size suitable for passing though the drift diameter of a tube string, such as a casing string and in the expanded position, the bit is generally selected to be capable of use to drill a bore hole of a gauge greater than the outer diameter of the tube string.
- The outer cutter face and the center cutter face include cutters selected to be useful in forming a borehole through an earthen formation. In one embodiment, the center cutter face and the outer cutter face form a substantially continuous bit surface when the arm is in its expanded position.
- The arm can be moveable between the expanded position and the stored position in any desired way, as by use of a slidable wedge arrangement or by use of a pivotal connection.
- The bit can include jetting ports through which fluid can be passed, for example, for cleaning and lubricating the bit.
- The bit can include a housing including an upper end, a lower end, an axis defined as extending through the upper end and the lower end and a bore extending parallel to the axis into the lower end; and the center cutter face is disposed on a mandrel slidingly disposed in the bore, the mandrel having a lower end and an upper end; and the arm being drivable into the expanded position by the mandrel bearing thereagainst to drive the arm out. The mandrel can be formed to support the arm, when it is in the expanded position. For example, the arm can be formed to bear against the mandrel when it is in the expanded position. The mandrel and the arm can be formed such that they substantially conform to one another along a portion of their contacting surfaces once the arm is in its expanded position so that forces affecting the arm can be reacted through the mandrel. In its stored position, the arm can be positioned below the bore, adjacent the bore or can extend into the bore. Generally, it is desirable to form the arms such that they extend into the bore, when in the stored position, to reduce the stored size of the bit as much as possible.
- Thus, in accordance with another broad aspect of the present invention there is provided a drill bit for forming a borehole through an earthen formation, the drill bit comprising: a housing including an upper end, a lower end, an axis defined as extending through the upper end and the lower end and a bore extending parallel to the axis into the lower end; a mandrel slidingly disposed in the bore, the mandrel having a lower end and an upper end; a centre cutter face on the mandrel lower end; an arm having a lower end and connected to the housing adjacent the bore, the arm being radially moveable about between a stored position and an expanded position, the arm being drivable into the expanded position by the mandrel bearing thereagainst to drive the arm out; and a outer cutter face on the arm lower end.
- In one embodiment, the arm is positioned in a slot in the housing. The slot can be formed to conform about the arm side and upper surfaces to support the arm and provide for transfer of stress into the housing.
- In one embodiment, the outer cutter face, when the arms are expanded, are substantially co-planar with the center cutter face. Thus in accordance with another broad aspect of the present invention, there is provided a drill bit for forming a borehole through an earthen formation, the drill bit comprising: a center cutter face; an arm positioned about the center cutter face and selected to be radially moveable relative to the center cutter face between a stored position defining a stored bit diameter and an expanded position defining an expanded bit diameter, greater than the stored bit diameter; and an outer cutter face disposed on the arm and selected such that when the arm is in the expanded position, the outer cutter face and the center cutter face are substantially co-planar.
- A further, detailed, description of the invention, briefly described above, will follow by reference to the following drawings of specific embodiments of the invention. These drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. In the drawings:
-
FIG. 1 is an axial sectional view through a bit in accordance with the present invention, in an expanded position for use. Reference can be made toFIG. 3 line 1-1 for understanding of the section which is illustrated inFIG. 1 ; -
FIG. 1A is an axial sectional view of the bit ofFIG. 1 in a stored position; -
FIG. 2 is a transverse sectional view through the bit ofFIG. 1 taken along line 2-2; -
FIG. 3 is a transverse sectional view through the bit ofFIG. 1 taken along line 3-3; -
FIG. 4 is an end elevation of the bit ofFIG. 1 ; -
FIG. 5 is an end elevation of the bit ofFIG. 1A ; -
FIG. 6 is a side view of an arm and slot ofFIG. 1 ; -
FIG. 6A is a side elevation of an arm useful in the bit ofFIG. 1 ; -
FIG. 6B is an axial sectional of the lower portion a bit housing useful in the bit ofFIG. 1 ; -
FIG. 7 is an axial sectional view through another bit in accordance with the present invention, in an expanded position for use. Reference is made to the sectional line 7-7 inFIG. 10 ; -
FIG. 7A is an axial sectional view of the bit ofFIG. 7 in a collapsed, stored position; -
FIG. 8 is a transverse sectional view through the bit ofFIG. 7 taken along line 8-8; -
FIG. 9 is a side view of an arm and slot ofFIG. 7 ; -
FIG. 10 is an end elevation of the bit ofFIG. 7 ; -
FIG. 11 is an end elevation of the bit ofFIG. 7A ; -
FIG. 12 is a side elevation of the lower portion of the bit ofFIG. 7 ; -
FIG. 13 is an axial sectional view through another bit in accordance with the present invention, in an expanded position for use. Reference is made toFIG. 14 , wherein the section ofFIG. 13 is shown along line 13-13; -
FIG. 13A is an axial sectional view of the bit ofFIG. 7 in a collapsed, stored position; and -
FIG. 14 is an end elevation of the bit ofFIG. 13 . - Referring to FIGS. 1 to 6, there is shown one embodiment of a bit according to the present invention. As will be appreciated, the bit is useful to form or extend a borehole. The bit is engageable at the lower end of a drill string. If the bit is used when drilling with casing, the drill string is a string of casing and the bit is releasably locked to the string of casing by, for example, a drilling lock assembly. The bit is rotated either by rotation of the casing string from surface or by use of a mud motor.
- The bit includes a
cutter face 10 formed of a center cutter face and an outer cutter face, amandrel 12 and ahousing 14. -
Mandrel 12 includes alower end 12 a and anupper end 12 b. In the illustrated embodiment,upper end 12 b is formed as a blank. However, this blank will be milled or otherwise treated to a form suitable for connection to the drilling drive means. In one embodiment, the blank will be formed as a threaded pin end for connection to the drilling lock assembly or another component for eventual connection to the drill string. Mandrel further includes aninner bore 13. -
Housing 14 includes anupper end 14 a and alower end 14 b.Housing 14 further includes an upper inner bore 14 c defined between areturn 14 d at the upper end of the housing and ashoulder 14 e.Housing 14 further includes a lowerinner bore 14 f extending belowshoulder 14 e. - The housing carries three, or any desired number of, bit
arms 15. The bit arms are moveable between a stored position (FIG. 1A ), wherein they are retracted against or, as shown, into the housing and its inner bore and an expanded position (FIG. 1 ) wherein they are supported for use to extend the well bore. The bit arms are moveable between the stored position and the expanded position by relative axial movement of the mandrel and the housing. In particular, whenhousing 14 is in a lower position relative to the mandrel wherein the mandrel is retracted into the bore of thehousing bit arms 15 are in or can be driven into the stored position and whenhousing 14 is moved upwardly overmandrel 12, the bit arms are driven out to the expanded position. In the expanded position,lower end 12 a of the mandrel is flush with or extends fromlower end 14 b of the housing.Bit arms 15 each retaincutters Bit arms 15, when in the expanded position, form the outer cutter face of the bit, as will be discussed in greater detail herein below. - Lower end 12 a of the mandrel forms the center cutting face and retains
cutters 18 on its lower outer surface forming the center cutter face, as will be described in greater detail hereinbelow. -
Mandrel 12 is positioned in the inner bore ofhousing 14 andhousing 14 is slidably mounted to move axially overmandrel 12.Mandrel 12 includes an annular groove defined byshoulder 19 a andannular flange 19 b which limit movement of the housing over the mandrel by abutment againstupper end 14 a and return 14 d of the housing. When the bit is not in operation,housing 14 is normally in a lower position relative to the mandrel wherein return abuts againstflange 19 b. However, for operation of the bit,housing 14 is driven to an upper position on mandrel wherein end 14 a abuts againstshoulder 19 a. -
Housing 14 is driven upwardly by injection of hydraulic fluid into achamber 26 formed between the housing and the mandrel. In particular, in chamber 26 apiston face 28 is formed on the housing against which fluid pressure can act to drive the housing alongmandrel 12.Piston face 28 is in communication withinner bore 13 of the mandrel viaports 30, such that fluid pressure applied from surface, such as during pressuring up of the drill string communicated throughbore 13 and intochamber 26.Seals - To enhance operation of
chamber 26 to movehousing 14 upwardly over the mandrel, bore 13 has formed or positioned therein arestriction nozzle 34 to increase the pressure in the mandrel inner bore above the nozzle, inports 30 and inchamber 26.Restriction nozzle 34 acts as to increase the pressure differential between the fluid pressure in these parts and the pressure external to the tool in the borehole in which the bit is operated. - While
housing 14 andmandrel 12 can move axially with respect to each other, they are restricted from relative rotational movement by an interlock arrangement such as asplined area 36 on the mandrel that mates with a similarly shapedarea 37 on the housing or other arrangement. The interlock arrangement ensures that torque applied to the mandrel is transferred to the housing and thereby to the plurality ofbit arms 15 mounted inslots 42 on the housing. -
Bit arms 15 includecutters 16, 16 b at their lower surfaces and are pivotally connected at their opposite ends bypins 46 tohousing 14. The pivotalconnection permits arms 15 to move between the stored position withinslots 42 and the radially expanded position whereincutters 16, 16 b extend out fromslots 42 past the outer surface of the housing. In the radially expanded position,cutters 16, 16 b are exposed for enlarging the well bore. The position of each bit arm in the radially expanded position is limited by abutment ofsurface 50 againstupper end 42 a of the slot in which it is mounted. In addition, each arm includes ahook 53 on each of its side edges. The hooks are selected to engage undershoulders 54 formed in the slots. Together with abutment ofsurface 50 againstupper end 42 a of the slot, the engagement ofhooks 53 undershoulders 54 provide thrust support for the arms during use. -
Bit arms 15 are mounted to extend throughslots 42 into lowerinner bore 14 f of the housing when it is in the lower position on the mandrel and the mandrel is retracted up into the housing. As such,arms 15 when in the stored position, can abut against one another at or about the center axis ofinner bore 14 f. To reduce the effective outer diameter, d, of thearms 15 in the stored position, a portion of 56 a of the arm rear surface can be formed, for example as wedges, to fit closely together (FIGS. 5 and 6 ). -
Bit arms 15, as noted hereinbefore, are driven radially outwardly when the housing is moved upwardly over the mandrel. In particular, the arms are driven outwardly by abutment ofend 12 a of mandrel against the rear surfaces of the arms. - In the expanded position, the arms are held out by the mandrel. The arms can be supported about their sides and rear surfaces to enhance their durability and strength. In particular,
slots 42 are formed at their upper ends 42 a and sides 42 b to substantially conform to the sides of the arms. In addition, the arms can be formed with respect to the mandrel such that when they are in the expanded position, they are supported adjacent their ends by the mandrel. In particular, the arms have curvedrear surfaces 56 b which substantially correspond to the outer curvature of the mandrel adjacent its lower end. This close positioning provides that forces can be effectively transferred from the arms to the housing and the mandrel. - The cutter face of the bit is formed by the center cutter
face including cutters 18 onmandrel 12 and the outer cutter face formed bycutters 16 a onarms 15, when the arms are expanded out andmandrel 12 is positioned between them. The relative sliding movement of the mandrel and the housing is selected such that, the mandrel is positioned with center cutter face substantially co-planar with the outer cutter face when the bit is expanded for use. In the illustrated embodiment, the cutter face also includescutters 59 positioned on the lower end of the housing to facilitate the formation of a borehole using the bit.Cutters 16 b, positioned on the outwardly facing front surfaces of the bit arms are useful for reducing failure due to wear of the arms and clean out the hole behind the cutter face of the bit. While percussive type cutters have been shown, it is to be understood that other cutter types can be used. -
Ports 57, in communication withbore 13, are provided, as in a standard bit, to lubricate and clean the cutting face.Ports 57 open in the center cutter face. However, due to the nature of bit operation, fluids jetted through the ports will also pass over, clean and lubricatecutters ports 57 during pressuring-up of the drill string. - In operation, it is advantageous that the housing not move over the mandrel every time there is a pressure drop. Thus, in one embodiment, there is provided a releasable lock assembly to lock
mandrel 12 andhousing 14 in the operating position. In the illustrated embodiment ofFIGS. 1 and 1 A, the releasable lock assembly is a spring-biased detent arrangement including a plurality of spring-biaseddetents 66 in the housing which engage in agroove 68 in the mandrel. The spring force ofdetents 66 is selected to be greater than the force generated by the weight ofhousing 14 andarms 15, which would tend to pull the housing down over the mandrel. However, the spring force of thedetents 66 can be overcome to move the housing down and allow retraction ofbit arms 15 when a selected force is applied, such as the force generated by pulling the arms against the end of the casing to trip the bit to surface.Upper surfaces 15 a of the arms are ramped to facilitate folding down of the arms when they are butted against the end of the casing.Detents 66 can be replaced with other lock means, as desired. - To facilitate manufacture,
mandrel 12 andhousing 14 can be formed in sections as shown and threaded together or secured in some other way.Pins 46 are conveniently installed through bores in the housing and secured betweenshoulders 70 andbolts 72.Detents 66 are installed inports 74 by threadedcaps 76. - Referring to FIGS. 7 to 12, there is shown another expandable bit according to the present invention. The bit includes a
mandrel 112, ahousing 114 and a pair ofbit arms 115 supported on the housing.Mandrel 112 includes alower end 112 a and aninner bore 13 with aventuri nozzle 34 formed therein. -
Housing 114 includes alower end 114 b and aninner bore 114 c in which mandrel 112 is telescopically disposed. Ahydraulic chamber 26 is formed between the housing and the mandrel and includes apiston face 28 formed onhousing 114. The hydraulic chamber reacts to fluid injection though bore 13 to drive the housing axially over the mandrel. - An
interlock arrangement detents 66 and agroove 68. -
Bit arms 115 have mounted thereoncutters 116. Thebit arms 115 are pivotally mounted bypins 146 inslots 142 in a region of the housing from which mandrel 112 is retracted when the housing is in the lower position on the mandrel. In this position,arms 115 extend intobore 114 c when the mandrel is retracted, but are pushed out into an expanded position by the center cutter face 118 a of the mandrel when the housing is driven axially up over the mandrel by injection of fluid intochamber 26. - In the illustrated embodiment,
slots 142, and therebyarms 115, are spaced fromend 114 b of the housing such thatarms 115 are spaced from the center cutter face 118 a on the mandrel when the bit is expanded for use. However,cutters 159 are disposed on the housing betweenend 114 b and theslots 142 such that a substantially continuous cutter face is provided includingcutters 116 on the bit arms,cutters 159 on the housing and the center cutter face 118 a. This cutter face provides extended cutter engagement with the borehole wall during formation of a borehole. - By use of only two bit
arms 115, the arms can be elongated and positioned to overlap inbore 114 c in side-by-side configuration when in the stored position.Slots 142 are formed to closely surround the bit arms to support them in the expanded position. Each bit arm includes a shoulder 153 which engages under a shoulder 154 formed in the slot. In addition, the lower end of each bit arm is selected to engage under the lower end of its slot when in the expanded position. This limits outward expansion and stabilizes the arms by being secured both at their top and bottom ends. -
Ports 157 extend frombore 13 and open into center cutter face 118 a.Channels 180 are formed in the center cutter face andchannels 182, which substantially align withchannels 180 when thecutter face 118 a is exposed for use at the end of the housing, are provided to facilitate flow of fluid, as shown by the arrows inFIG. 10 , fromports 157 along the cutter face to the clean and lubricatecutters 116 on the arms. - Referring to
FIGS. 13 and 14 , there is shown another expandable bit according to the present invention. The bit is generally similar to the bit ofFIG. 1 and includes amandrel 212, ahousing 214 and bitarms 215 supported on the housing. However, the mandrel and the housing are formed such that in the expanded position,mandrel 212 is distanced out from the lower end 214 b of the housing. As such, the cutter faces, formed bycutters 216, on the bit arms are spaced from the center cutter face 218 a on the mandrel during operation of the bit to drill a borehole. -
Ports 257 open into center cutter face 218 a and are positioned in channels 280 formed in the center cutter face. Channels 280 which substantially align with channels 282 on the bit arms, when the bit is in the expanded position, to facilitate flow of fluid fromports 257 along the cutter face to the clean and lubricatecutters 216 on the arms. - Although various embodiments of the present invention have been described in some detail hereinabove, those skilled in the art will recognise that various substitutions and modifications may be made to the invention without departing from the scope and spirit of the appended claims.
Claims (33)
1. A drill bit for forming a borehole through an earthen formation, the drill bit comprising: a housing including an upper end, a lower end, an axis defined as extending through the upper end and the lower end and a bore extending parallel to the axis into the lower end; a mandrel slidingly disposed in the bore, the mandrel having a lower end and an upper end; a centre cutter face on the mandrel lower end; an arm having a lower end and connected by a pivotal connection to the housing adjacent the bore, the arm being radially moveable by rotation about the pivotal connection between a stored position and an expanded position, the arm being drivable into the expanded position by the mandrel bearing thereagainst to drive the arm out; and an outer cutter face on the arm lower end.
2. The drill bit of claim 1 further comprising a slot in the housing in which the arm is mounted.
3. The drill bit of claim 2 , wherein the slot is formed to conform about the arm side and upper surfaces to support the arm and provide for transfer of stress into the housing.
4. The drill bit of claim 2 wherein the slot is open to the end of the housing.
5. The drill bit of claim 2 wherein the slot is spaced from the end of the housing.
6. The drill bit of claim 1 wherein the center cutter face and the outer cutter face form a substantially continuous bit surface when the arm is in its expanded position.
7. The drill bit of claim 1 further comprising fluid jetting ports through which fluid can be passed for cleaning and lubricating the bit.
8. The drill bit of claim 7 wherein the fluid jetting ports open to the center cutter face.
9. The drill bit of claim 8 further comprising a channel on the center cutter face for conveying fluid from the fluid jetting ports outwardly toward the outer cutter face.
10. The drill bit of claim 9 further comprising an outer channel on the outer cutter face arranged to communicate with the channel on the center cutter face, the outer channel selected to convey fluid along the outer cutter face.
11. The drill bit of claim 1 further comprising a hydraulic drive chamber between the housing and the mandrel, the hydraulic drive chamber formed to accept hydraulic-fluid pressure to drive sliding movement of the mandrel along the bore of the housing.
12. The drill bit of claim 11 wherein the mandrel includes an inner bore for conveying fluid therethrough, a port from the mandrel inner bore to the hydraulic chamber and a restriction nozzle in the mandrel inner bore.
13. The drill bit of claim 1 wherein the arm includes cutters on its side surface extending from its outer cutter face.
14. The drill bit of claim 1 wherein the housing and the arm are formed to limit the radial outward movement of the arm.
15. The drill bit of claim 1 wherein the arm is a first arm and the drill bit further comprises a second arm spaced circumferentially on the housing from the first arm and the second arm is radially moveable with the first arm relative to the housing between a stored position and an expanded position, as driven by the mandrel bearing thereagainst.
16. The drill bit of claim 1 further comprising a releasable lock to releasably lock the mandrel against sliding movement within the bore.
17. The drill bit of claim 1 wherein the mandrel and the housing are formed to interengage such that rotation of the mandrel drives rotation of the housing.
18. A drill bit for forming a borehole through an earthen formation, the drill bit comprising: a center cutter face; an arm positioned about the center cutter face and selected to be radially moveable relative to the center cutter face between a stored position defining a stored bit diameter and an expanded position defining an expanded bit diameter, greater than the stored bit diameter; and an outer cutter face disposed on the arm and selected such that when the arm is in the expanded position, the outer cutter face and the center cutter face are substantially continuous and co-planar.
19. The drill bit of claim 18 further comprising a hydraulic drive chamber between the housing and the mandrel, the hydraulic drive chamber formed to accept hydraulic fluid pressure to drive sliding movement of the mandrel along the bore of the housing.
20. The drill bit of claim 18 further comprising a slot in the housing in which the arm is mounted.
21. The drill bit of claim 20 , wherein the slot is formed to conform about the arm side and upper surfaces to support the arm and provide for transfer of stress into the housing.
22. The drill bit of claim 18 further comprising fluid jetting ports through which fluid can be passed for cleaning and lubricating the bit.
23. The drill bit of claim 22 wherein the fluid jetting ports open to the center cutter face.
24. The drill bit of claim 23 further comprising a channel on the center cutter face for conveying fluid from the fluid jetting ports outwardly toward the outer cutter face.
25. The drill bit of claim 24 further comprising an outer channel on the outer cutter face arranged to communicate with the channel on the center cutter face, the outer channel selected to convey fluid along the outer cutter face.
26. The drill bit of claim 18 , wherein the drill bit is formed for connection to a drilling drive means to which the upper end is connectable is selected from the group consisting of: a drill string; a sub connectable to a drill string; a downhole motor or a sub connected to a downhole motor.
27. The drill bit of claim 18 , further comprising fluid jetting ports through which fluid can be passed for cleaning and lubricating the bit.
28. The drill bit of claim 18 , wherein the bit is selected to be a size suitable for passing though the drift diameter of a tube string
29. The drill bit of claim 18 , wherein in the expanded position, the bit is selected to be capable of use to drill a bore hole of a gauge greater than the outer diameter of a tube string through which it has been tripped.
30. The drill bit of claim 18 , wherein the outer cutter face and the center cutter face include cutters selected to be useful in forming a borehole through an earthen formation.
31. The drill bit of claim 18 further comprising: a housing including an upper end, a lower end, an axis defined as extending through the upper end and the lower end and a bore extending parallel to the axis and through the lower end; and the center cutter face is disposed on a mandrel slidingly disposed in the bore, the mandrel having a lower end and an upper end; and the arm being drivable into the expanded position by the mandrel bearing thereagainst to drive the arm out.
32. The drill bit of claim 31 wherein the mandrel is formed to support the arm in the expanded position.
33. The drill bit of claim 31 wherein the arms extend into the bore when in the stored position.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002401917A CA2401917A1 (en) | 2002-09-06 | 2002-09-06 | Expandible bit |
CA2,401,917 | 2002-09-06 | ||
PCT/CA2003/001305 WO2004022904A1 (en) | 2002-09-06 | 2003-09-05 | Expandable bit |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060096785A1 true US20060096785A1 (en) | 2006-05-11 |
Family
ID=31954513
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/526,360 Abandoned US20060096785A1 (en) | 2002-09-06 | 2003-09-05 | Expandable bit |
Country Status (4)
Country | Link |
---|---|
US (1) | US20060096785A1 (en) |
AU (1) | AU2003266036A1 (en) |
CA (1) | CA2401917A1 (en) |
WO (1) | WO2004022904A1 (en) |
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NO325281B1 (en) * | 2002-12-31 | 2008-03-17 | Weatherford Lamb | Device and method of drilling by means of expandable drill bit with secondary release device |
WO2011094359A2 (en) * | 2010-01-26 | 2011-08-04 | Wvc Mincon Inc. | Drilling assembly with underreaming bit and method of use |
WO2011123765A2 (en) * | 2010-04-01 | 2011-10-06 | Center Rock Inc. | Down-the-hole drill hammer having an extendable drill bit assembly |
WO2016130892A1 (en) * | 2015-02-13 | 2016-08-18 | Schlumberger Technology Corporation | Bottomhole assembly |
US10119350B2 (en) * | 2016-05-26 | 2018-11-06 | Baker Hughes, A Ge Company, Llc | Expandable junk mill |
DE102018105340A1 (en) * | 2018-03-08 | 2019-09-12 | Mhwirth Gmbh | Drilling head and this comprehensive drilling system |
US20220025727A1 (en) * | 2018-11-29 | 2022-01-27 | Abrado, Inc. | Method and apparatus for locking expandable cutters of well bore casing mill |
CN114277831A (en) * | 2022-01-11 | 2022-04-05 | 中国电建集团福建省电力勘测设计院有限公司 | Offshore pawl type concrete filled steel tube pile foundation, adaptive drill bit and foundation construction method |
US11499374B2 (en) * | 2017-12-13 | 2022-11-15 | Nov Downhole Eurasia Limited | Downhole devices and associated apparatus and methods |
US11542805B2 (en) * | 2019-06-16 | 2023-01-03 | Schlumberger Technology Corporation | Marking and sensing a borehole wall |
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EP3658741A4 (en) | 2017-07-24 | 2021-03-24 | Luc Charland | Drilling system and method of using same |
DE102020131532A1 (en) * | 2020-11-27 | 2022-06-02 | Zipp Industries GmbH & Co.KG | drilling device |
CN113530433B (en) * | 2021-07-17 | 2024-02-20 | 无锡市政建设集团有限公司 | Triaxial reducing stirring drill rod |
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NO325281B1 (en) * | 2002-12-31 | 2008-03-17 | Weatherford Lamb | Device and method of drilling by means of expandable drill bit with secondary release device |
WO2011094359A2 (en) * | 2010-01-26 | 2011-08-04 | Wvc Mincon Inc. | Drilling assembly with underreaming bit and method of use |
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WO2011123765A3 (en) * | 2010-04-01 | 2011-11-24 | Center Rock Inc. | Down-the-hole drill hammer having an extendable drill bit assembly |
US8439135B2 (en) | 2010-04-01 | 2013-05-14 | Center Rock Inc. | Down-the-hole drill hammer having an extendable drill bit assembly |
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US11542805B2 (en) * | 2019-06-16 | 2023-01-03 | Schlumberger Technology Corporation | Marking and sensing a borehole wall |
CN114277831A (en) * | 2022-01-11 | 2022-04-05 | 中国电建集团福建省电力勘测设计院有限公司 | Offshore pawl type concrete filled steel tube pile foundation, adaptive drill bit and foundation construction method |
Also Published As
Publication number | Publication date |
---|---|
AU2003266036A1 (en) | 2004-03-29 |
CA2401917A1 (en) | 2004-03-06 |
WO2004022904A1 (en) | 2004-03-18 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |
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Owner name: NABORS DRILLING TECHNOLOGIES USA, INC., TEXAS Free format text: MERGER;ASSIGNOR:TESCO CORPORATION;REEL/FRAME:047242/0507 Effective date: 20171228 |