CA2596282A1 - Wellbore circulation system - Google Patents

Wellbore circulation system Download PDF

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Publication number
CA2596282A1
CA2596282A1 CA002596282A CA2596282A CA2596282A1 CA 2596282 A1 CA2596282 A1 CA 2596282A1 CA 002596282 A CA002596282 A CA 002596282A CA 2596282 A CA2596282 A CA 2596282A CA 2596282 A1 CA2596282 A1 CA 2596282A1
Authority
CA
Canada
Prior art keywords
tubular
tong
gear
jaw
kelly
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.)
Granted
Application number
CA002596282A
Other languages
French (fr)
Other versions
CA2596282C (en
Inventor
John Timothy Allen
Steven Anthony Box
Bernd-Georg Pietras
Jeffrey Michael Habetz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weatherford Lamb Inc
Original Assignee
Weatherford/Lamb, Inc.
John Timothy Allen
Steven Anthony Box
Bernd-Georg Pietras
Jeffrey Michael Habetz
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 Weatherford/Lamb, Inc., John Timothy Allen, Steven Anthony Box, Bernd-Georg Pietras, Jeffrey Michael Habetz filed Critical Weatherford/Lamb, Inc.
Publication of CA2596282A1 publication Critical patent/CA2596282A1/en
Application granted granted Critical
Publication of CA2596282C publication Critical patent/CA2596282C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
    • 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
    • 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
    • E21B19/16—Connecting or disconnecting pipe couplings or joints
    • E21B19/161—Connecting or disconnecting pipe couplings or joints using a wrench or a spinner adapted to engage a circular section of pipe
    • E21B19/164—Connecting or disconnecting pipe couplings or joints using a wrench or a spinner adapted to engage a circular section of pipe motor actuated
    • 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
    • E21B19/24—Guiding or centralising devices for drilling rods or pipes
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/10—Valve arrangements in drilling-fluid circulation systems
    • E21B21/106—Valve arrangements outside the borehole, e.g. kelly valves
    • 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
    • E21B3/00—Rotary drilling
    • E21B3/02—Surface drives for rotary drilling
    • E21B3/04—Rotary tables
    • 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
    • E21B19/10—Slips; Spiders ; Catching devices

Abstract

A system (10) for continuously circulating fluid to and through a tubular string either of coiled tubing or made up of a plurality of tubulars connected end-to-end while an upper tubular (32) is added to or removed from a top tubular (26) of the plurality of tubulars, all tubulars having a top-to-bottom fluid flow channel therethrough.
The system has an upper chamber (43) with an upper sealing apparatus (34) for sealingly encompassing a portion of the upper tubular, a lower chamber (45) with a lower sealing apparatus (36) for. sealingly encompassing a portion of the top tubular (26), one of the upper chamber and the lower chamber sized for accommodating connection and disconnection therein of the upper tubular and the top tubular, and gate apparatus (60) between and in fluid communication with the upper chamber and the lower chamber.

Claims (73)

1. A kelly bushing, comprising:
a base with a tubular channel therethrough from top to bottom, the base having a plurality of base axle slots;
a roller support on the base, the roller support having a plurality of roller support axle slots;
at least one roller having an axle, wherein the axle has a first portion movably positioned in a corresponding roller support axle slot of the roller support so that movement of the axle there moves the at least one roller with respect to the tubular channel, and wherein the axle has a second portion movably positioned in a corresponding base axle slots of the base so that movement of the axle therein moves the at least one roller with respect to the tubular channel; and a leveling bar at the top of the roller support, wherein the roller support is movable vertically by moving the leveling bar;
wherein the base axle slots are at an angle to the roller support axle slots so that movement of the leveling bar effects movement of the base axle slots with respect to the roller support thereby moving the at least one roller with respect to the tubular channel into and out of contact with a kelly within the tubular channel.
2. The kelly bushing of claim 1, further comprising:
a plurality of spaced-apart guide rods extending upwardly from the base and through openings in the leveling bar to guide movement of the leveling bar with respect to the base thereby guiding movement of the at least one roller.
3. An apparatus for use with a torque transmission member, comprising:
a body;
a channel extending through the body for receiving the torque transmission member;
and one or more engagement members coupled to the body, wherein the one or more engagement members are adapted to engage the torque transmission member;

wherein the one or more engagement members is coupled to two intersecting guide members and changing a point of intersection between the two intersecting guide members causes the one or more engagement members to engage or disengage the torque transmission member.
4. The apparatus of claim 3, wherein the one or more engagement members include an axle for mating with the two intersecting guide members.
5. The apparatus of claim 4, wherein the axle is movable along the two intersecting guide members.
6. The apparatus of claim 3, 4 or 5, wherein the body comprises two body portions.
7. The apparatus of claim 6, wherein the two body portions are releasably connected.
8. The apparatus of any one of claims 3 to 7, wherein the one or more engagement members comprises a profile for engaging the torque transmission member.
9. The apparatus of claim 8, wherein the profile is adapted to transfer torque to the torque transmission member.
10. The apparatus of any one of claims 3 to 9, wherein the apparatus is coupled to a rotary table.
11. The apparatus of any one of claims 3 to 10, wherein the one or more engagement members are radially movable to engage or disengage from the torque transmission member.
12. The apparatus of any one of claims 3 to 11, further comprising an actuating member for moving the two intersecting guide members.
13. The apparatus of claim 12, wherein the actuating member is adapted to change the point of intersection between the two intersecting guide members.
14. The apparatus of any one of claims 3 to 13, wherein the apparatus comprises a bushing and the torque transmission member comprises a kelly.
15. The apparatus of claim 14, wherein the kelly comprises a polygonal profile.
16. The apparatus of any one of claims 3 to 15, wherein the apparatus is positionable on a rig floor with the one or more engagement members beneath the rig floor.
17. The apparatus of any one of claims 3 to 16, wherein the one or more engagement members comprise one or more rollers.
18. An apparatus for use with a downhole tool, comprising:
a kelly coupled to the downhole tool; and a kelly bushing which comprises:
a body;
a channel extending through the body for receiving the kelly;
a roller coupled to the body, the roller adapted to engage the kelly;
at least two intersecting guide members movably coupled to the body; and an actuating member for changing a point of intersection between the two intersecting guide members;
wherein movement of the roller along the at least two intersecting guide members causes the roller to engage or disengage the kelly.
19. The apparatus of claim 18, further comprising a rotary table for rotating the kelly bushing.
20. The apparatus of claim 19, wherein torque generated by the rotary table is transmitted to the kelly through the kelly bushing.
21. The apparatus of claim 18, 19 or 20, wherein the roller comprises a profile for engaging the kelly.
22. The apparatus of claim 21, wherein the kelly comprises a complementary profile for mating with the profile of the roller.
23. The apparatus of claim 22, wherein the complementary profile comprises a polygonal profile.
24. The apparatus of any one of claims 18 to 23, wherein the downhole tool comprises a wellbore tubular.
25. The apparatus of claim 24, wherein the wellbore tubular is selected from the group consisting of a drill pipe, a tool joint, and combinations thereof.
26. The apparatus of any one of claims 18 to 25, wherein a diameter of the kelly is larger than a diameter of the downhole tool.
27. The apparatus of any one of claims 18 to 26, wherein the kelly comprises a tubular.
28. A kelly bushing comprising:
a base with a tubular channel therethrough from top to bottom, the base having a plurality of base axle slots;
a roller support on the base, the roller support having a plurality of roller support axle slots; and a plurality of spaced-apart rollers, each roller being mounted on a respective axle;
wherein each axle has a portion movably positioned in a corresponding roller support axle slot so that movement of an axle therein moves its corresponding roller with respect to the tubular channel; and wherein each axle has a portion movably positioned in a corresponding base axle slot so that movement of an axle therein moves its corresponding roller with respect to the tubular channel;

the kelly bushing further comprising:
a leveling bar at the top of the roller support, the roller support being movable vertically by moving the leveling bar, wherein the base axle slots are at an angle to the roller support axle slots so that movement of the leveling bar effects movement of the base axle slots with respect to the roller thereby moving the rollers with respect to the tubular channel into and out of contact with a kelly within the tubular channel.
29. A kelly bushing as claimed in claim 28, further comprising a plurality of spaced-apart guide rods extending upwardly from the base and through openings in the leveling bar to guide movement of the leveling bar with respect to the base thereby guiding movement of the rollers.
30. A kelly bushing comprising:
a body with a tubular channel therethrough from top to bottom; and a plurality of rollers connected to the body and spaced-apart around the bottom of the body, each roller having a portion projecting into the tubular channel for contacting flats of a kelly projecting through the body.
31. A kelly bushing as claimed in claim 30, further comprising:
a slip bowl formed of and within the body for receiving and holding slips therein for gripping a portion of a kelly extending through the kelly bushing.
32. A kelly bushing as claimed in claim 30 or 31, wherein the kelly bushing is positioned on a rig floor with the rollers beneath the rig floor.
33. A kelly bushing comprising:
a body having an opening therethrough for the passage of tubulars through the kelly bushing; and roller apparatus connected to the body for facilitating tubular movement through the body;

wherein the opening is sufficiently large that a kelly, tool joints and drill pipe are movable therethrough, the kelly having a hex part and a tool joint part.
34 34. A kelly bushing comprising:
a body with a tubular therethrough from top to bottom; and a plurality of rollers connected to the body and spaced-apart around the body, each roller with a portion projecting into the tubular channel for contacting flats of part of a kelly projecting through the body;
wherein the body comprises two selectively separable halves releasably joined together.
35. A tong for use in wellbore operations, the tong comprising:
a housing with a hollow interior;
a gear secured to the housing, the gear having a toothed portion for mating with teeth of a drive shaft of a driving motor;
a gear flange mounted on top of the gear so that rotation of the gear does not rotate the gear flange;
one or more bearings disposed between the gear flange and the gear for dissipating stress when the gear and the gear flange are moved axially relative to each other;
and a plurality of spaced-apart jaw assemblies within the housing's hollow interior, each jaw assembly having a jaw for selectively engaging a portion of a tubular to be gripped and rotated by the tong, wherein each jaw assembly and the one or more bearings are configured for resisting both axial and radial loading.
36. The tong of claim 35, wherein each jaw assembly comprises a piston having one end disposed within a chamber of a jaw.
37. The tong of claim 36, further comprising supporting the jaw with a plurality of support surfaces to resist axial loading.
38. The tong of claim 37, wherein the plurality of support surfaces comprises a first contact surface between the piston and the jaw and a second contact surface between the jaw and the housing.
39. The tong of any one of claims 35 to 38, wherein each jaw assembly further comprises at least one toothed insert, the at least one toothed insert being used by each jaw to engage the tubular.
40. The tong of claim 39, wherein the plurality of spaced-apart jaw assemblies defines three spaced-apart jaw assemblies.
41. The tong of any one of claims 35 to 40, wherein the bearings between the gear flange and the gear facilitate the movement of the gear with respect to the gear flange.
42. The tong of any one of claims 35 to 41, wherein the tong's gear, gear flange, jaw assemblies and bearings are configured and sized to resist axial loading on the tong.
43. The tong of claim 42, further comprising fluid flow apparatus for selectively conveying operating fluid under pressure through the tong to the jaw assemblies for selectively operating the jaw assemblies into and out of engagement with the tubular.
44. The tong of claim 43, wherein each jaw assembly further comprises:
a jaw having a first end, a second end, and a chamber wall therebetween, the first end being sealed by a face, and the second end having an opening therein;
a chamber defined within the chamber wall of the jaw;
a piston having a first end within the chamber of the jaw, the first end of the piston being movable within the chamber by selectively applying fluid under pressure on one side of the first end of the piston, and a second end external to the jaw but being secured within the housing of the tong;
and wherein the toothed insert is disposed adjacent the face of the jaw and external to the chamber for engaging the tubular when the jaw is actuated, the insert being configured for resisting both axial and radial loading.
45. A tong for use in wellbore operations, the tong comprising:
a housing with a hollow interior;
a plurality of jaw assemblies, at least one of which is movably mounted in the hollow interior of the housing for selectively engaging a portion of a tubular to be gripped and rotated by the tong, the jaw assemblies configured to resist both axial and rotational movement of the tubular upon engagement therewith;
a gear structure on the housing for mating co-action with a tong drive apparatus;
a gear retention member for axially retaining the gear structure; and a bearing between the gear retention member and the gear structure for facilitating movement of the gear structure with respect to the gear retention member and for dissipating axial stress when the gear structure and the gear retention member are moved axially relative to each other.
46. The tong of claim 45, wherein each of the jaw assemblies further comprises an insert having teeth to aid in resisting both axial and rotational movement of the tubular upon engagement therewith.
47. The tong of claim 45 or 46, wherein the gear retention member and the bearing are sized and configured to resist axial loading.
48. The tong of claim 45, 46 or 47, wherein the plurality of jaw assemblies defines three spaced-apart jaw assemblies.
49. The tong of any one of claims 45 to 48, further comprising internal fluid flow apparatus for conducting fluid under pressure through the tong to the jaw assemblies for selective operation of the jaw assemblies for engaging and disengaging the tubular.
50. The tong of any one of claims 45 to 49, wherein said tong is used as part of a system for continuously circulating fluid to and through a tubular string while an upper tubular is connected or disconnected from a top tubular of the tubular string, the system comprising:
an upper chamber for receiving the upper tubular of the tubular string, said upper chamber having a bottom opening and a top opening;
a lower chamber for receiving the top tubular of the tubular string, said lower chamber having a bottom opening and a top opening, one of said upper chamber and said lower chamber sized for accommodating connection and disconnection therein of the upper tubular and the top tubular by the tong;

an upper sealing apparatus within said upper chamber for sealingly encompassing a portion of the upper tubular within said upper chamber;
a lower sealing apparatus within said lower chamber for sealingly encompassing a portion of the top tubular within said lower chamber; and an apparatus for isolating the upper chamber from fluid pressure loading within the lower chamber during connection or disconnection of the upper tubular and the top tubular.
51. The tong of claim 50, wherein the tong isolates the upper tubular from fluid pressure loading within the upper chamber.
52. A method for rotationally connecting two threaded tubulars, wherein at least one of the tubulars is subjected to an axial force created by a fluid pressure acting over at least a portion of a cross-sectional area of the at least one tubular, comprising the steps of:
providing a tong which is sized and configured to withstand the axial force, the tong having:
a housing with a hollow interior; and a plurality of jaw assemblies, at least one of which is movably mounted in the hollow interior of the housing for selectively engaging a portion of the at least one tubular;
gripping the at least one tubular with the tong;
rotating the at least one tubular with the tong, thereby relatively manipulating the threads between the two tubulars; and dissipating axial stress through a bearing.
53. The method of claim 52, wherein providing a tong comprises providing a tong having:
a gear structure on the housing for mating co-action with a tong drive apparatus;
a gear retention member for axially retaining the gear; and wherein the bearing between the gear retention member and the gear for facilitating movement of the gear with respect to the gear retention member, and wherein the bearing and the plurality of jaw assemblies are configured to resist both axial and rotational movement of the at least one tubular upon engagement therewith.
54. The method of claim 53, wherein providing a tong further comprises providing each of the jaw assemblies with an insert having teeth to aid in resisting both axial and rotational movement of the at least one tubular upon engagement therewith.
55. The method of claim 53 or 54, wherein the gear retention member and the bearing are sized and configured to resist axial loading.
56. The method of claim 55, wherein the plurality of jaw assemblies defines three spaced-apart jaw assemblies.
57. The method of claim 56, wherein providing a tong further comprises providing a tong having an internal fluid flow apparatus for conducting fluid under pressure through the tong to the jaw assemblies for selective operation of the jaw assemblies for engaging and disengaging from the tubular to be gripped and rotated by the tong.
58. A system for continuously circulating fluid to and through a tubular string while an upper tubular is connected or disconnected from a top tubular of the tubular string, the system comprising:
a tong having:
a housing with a hollow interior;
a gear secured to the housing, the gear having a toothed portion for mating with teeth of a drive shaft of a driving motor;
a gear flange mounted on top of the gear so that rotation of the gear does not rotate the gear flange; and one or more bearings disposed between the gear and the gear flange; and a plurality of spaced-apart jaw assemblies within the housing's hollow interior, each jaw assembly having a jaw for selectively engaging a portion of a tubular to be gripped and rotated by the tong, wherein each jaw assembly and the one or more bearings are configured for resisting both axial and radial loading;

an upper chamber for receiving the upper tubular of the tubular string, said upper chamber having a bottom opening and a top opening;
a lower chamber for receiving the top tubular of the tubular string, said lower chamber having a bottom opening and a top opening, one of said upper chamber and said lower chamber sized for accommodating connection and disconnection therein of the upper tubular and the top tubular by the tong;
an upper sealing apparatus within said upper chamber for sealingly encompassing a portion of the upper tubular within said upper chamber;
a lower sealing apparatus within said lower chamber for sealingly encompassing a portion of the top tubular within said lower chamber; and an apparatus for isolating the upper chamber from fluid pressure loading within the lower chamber during connection or disconnection of the upper tubular and the top tubular.
59. The system of claim 58, wherein the tong isolates the upper tubular from fluid pressure loading within the upper chamber.
60. A tong for use in wellbore operations, the tong comprising:
a housing with a hollow interior;
a gear wheel secured to the housing for rotation therewith, the gear wheel having a toothed outer circumference for mating with teeth of a drive shaft of a driving motor;
a gear flange mounted on top of the gear wheel so that rotation of the gear wheel does not rotate the gear flange; and a plurality of spaced-apart jaw assemblies within the housing's hollow interior, each jaw assembly having a jaw for selectively engaging a portion of a tubular to be gripped and rotated by the tong.
61. A tong as claimed in claim 60, further comprising fluid flow apparatus for selectively conveying operating fluid under pressure through the tong to the jaw assemblies for selectively operating the jaw assemblies.
62. A tong as claimed in claim 60 or 61, wherein the plurality of spaced-apart jaw assemblies is three spaced-apart jaw assemblies.
63. A tong as claimed in claim 60, 61 or 62, wherein each jaw assembly of the plurality of jaw assemblies has at least one insert thereon for engaging the tubular.
64. A tong as claimed in claim 63, wherein the inserts are toothed inserts.
65. A tong as claimed in claim 63 or 64, wherein the inserts are configured for resisting both axial and radial loading.
66. A tong as claimed in any one of claims 60 to 65, wherein each jaw assembly comprises:
a jaw body with an inner chamber having an outer wall with a channel therethrough;
and a piston with a first end in the inner chamber, the first end secured to or formed of an intermediate portion movable in the channel of the outer wall of the inner chamber, and a first end, and a second end secured to or formed of the intermediate portion, the second within the housing of the tong;
wherein the jaw body is selectively movable with respect to the piston into and out of engagement with the tubular by selectively applying fluid under pressure on one side of the first end of the piston.
67. A tong as claimed in any one of claims 60 to 66, further comprising a plurality of bearings between the gear flange and the gear wheel for facilitating movement of the gear wheel with respect to the gear flange.
68. A tong as claimed in claim 67, wherein the tong's gear flange, gear wheel, jaw assemblies and bearings are configured and sized to resist axial loading on the tong.
69. A tong for use in wellbore operations, the tong comprising:
a housing with a hollow interior;
a plurality of jaw assemblies movably mounted in the hollow interior of the housing;
gear structure on the housing for mating co-action with a tong drive apparatus; and internal fluid flow apparatus for conducting fluid under pressure through the tong to the jaw assemblies for selectively operation of the jaw assemblies for engaging and disengaging from a tubular to be gripped and rotated by the tong.
70. A system for continuously circulating fluid to and through a hollow tubular string while an upper hollow tubular is added to or removed from a top of the tubular string, the system comprising:
chamber means with a bottom opening, a top opening and sealing apparatus for sealingly encompassing a portion of the top of the tubular string, the chamber means being sized for accommodating connection and disconnection therein of the upper hollow tubular to the top of the tubular string;
a frame, the chamber means being selectively movably mounted to the frame;
pedestal apparatus, the frame being selectively movably mounted to the pedestal apparatus;
an offshore rig with a rig floor, the pedestal apparatus being positioned on the rig floor;
and a rig heave compensation system on the rig;
wherein the offshore rig heave compensation system intercommunicates with the system for continuously circulating fluid to selectively move the chamber means with respect to the rig floor to compensate for heaving of the offshore rig.
71. A kelly comprising:
a tubular body with a top and a bottom;
a flats tubular with a top and a bottom, the top of the body being formed of or secured to the bottom of the flats tubular, the flats portion having a plurality of flat surfaces around a circumference of the flats tubular; and at least one tool joint having a top and a bottom, the top of the at least one tool joint being connected to the bottom of the tubular body, the tool joint having an outer diameter;
wherein a diameter of the flats across a cross-section of the flats tubular from one flat surface to an opposing flat surface is at least as large as the outer diameter of the at least one tool joint.
72. A kelly comprising:
a tubular body with a top and a bottom;
a flats tubular with a top and a bottom, the top of the body formed of or secured to the bottom of the flats tubular, the flats portion having a plurality of flat surfaces around a circumference of the flats tubular;
a tool joint having a top and a bottom, the top of the tool joint being connected to the bottom of the tubular body;
wherein the tubular body is between five and ten feet in length.
73. A kelly as claimed in claim 72, wherein the tubular body is about six feet long.
CA2596282A 2000-03-14 2001-03-12 Wellbore circulation system Expired - Fee Related CA2596282C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/524,773 2000-03-14
US09/524,773 US6412554B1 (en) 2000-03-14 2000-03-14 Wellbore circulation system
CA002401075A CA2401075C (en) 2000-03-14 2001-03-12 Wellbore circulation system

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002401075A Division CA2401075C (en) 2000-03-14 2001-03-12 Wellbore circulation system

Publications (2)

Publication Number Publication Date
CA2596282A1 true CA2596282A1 (en) 2001-09-20
CA2596282C CA2596282C (en) 2010-07-13

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CA2596282A Expired - Fee Related CA2596282C (en) 2000-03-14 2001-03-12 Wellbore circulation system
CA002401075A Expired - Fee Related CA2401075C (en) 2000-03-14 2001-03-12 Wellbore circulation system

Family Applications After (1)

Application Number Title Priority Date Filing Date
CA002401075A Expired - Fee Related CA2401075C (en) 2000-03-14 2001-03-12 Wellbore circulation system

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US (3) US6412554B1 (en)
EP (1) EP1264069B1 (en)
AU (1) AU2001237635A1 (en)
CA (2) CA2596282C (en)
NO (1) NO326295B1 (en)
WO (1) WO2001069034A2 (en)

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CA2401075A1 (en) 2001-09-20
CA2401075C (en) 2007-11-13
US6668684B2 (en) 2003-12-30
US20040154835A1 (en) 2004-08-12
AU2001237635A1 (en) 2001-09-24
EP1264069A2 (en) 2002-12-11
US20020134555A1 (en) 2002-09-26
NO326295B1 (en) 2008-11-03
US6412554B1 (en) 2002-07-02
WO2001069034A2 (en) 2001-09-20
WO2001069034A3 (en) 2002-03-07
US7028787B2 (en) 2006-04-18
NO20024130L (en) 2002-10-25
CA2596282C (en) 2010-07-13
NO20024130D0 (en) 2002-08-30
EP1264069B1 (en) 2014-01-22

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