EP0105299B1 - Casing stabbing tools - Google Patents
Casing stabbing tools Download PDFInfo
- Publication number
- EP0105299B1 EP0105299B1 EP83901093A EP83901093A EP0105299B1 EP 0105299 B1 EP0105299 B1 EP 0105299B1 EP 83901093 A EP83901093 A EP 83901093A EP 83901093 A EP83901093 A EP 83901093A EP 0105299 B1 EP0105299 B1 EP 0105299B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tool
- joint
- housing
- sheave
- sheaves
- 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.)
- Expired
Links
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 210000000078 claw Anatomy 0.000 description 7
- 241000239290 Araneae Species 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
Definitions
- This invention relates to casing stabbing tools for use when a further casing joint (or section) of a string of steel casing joints lining a bore hole is being screwed to the uppermost joint of the string, said tools comprising a drive mechanism for positioning a structure, for example a mast, at a desired position between two points and restraining it from swinging about.
- US Specification US-A-2-2 450 934 discloses a well drill pipe handling apparatus comprising a frame which is fixedly mounted on the rig platform and supports, in ascending order, a work-holding tong for holding the top downhole drill pipe section, a tightening tong for finally tightening the next pipe section to be added, a rapid joint spinner and a manipulator arm for holding the lower portion of a suspended section to be added to the downhole section.
- Such an apparatus is for adding to the downhole pipe further sections of drill pipe which are only up to 18 mm in diameter and have coarse, robust conical threads not requiring precise alignment.
- the manipulator arm is for guiding the lower end of a 23-25 m drill pipe string, which is suspended from its upper end, into the correct position, and considerable skill is required to operate such a free-swinging manipulator arm.
- the above apparatus would not be adaptable to handling the joints of a casing string which have a diameter 2 or 3 times as great as that of drill pipe and much more delicate threads.
- An aim of the present invention is to provide a tool that is capable of handling such joints.
- a tool for facilitating screwing onto the upper threaded end of the uppermost downhole joint of a well string the lower threaded end of a next joint to be added to the string comprising an upstanding frame having mounted thereon lower clamping means for rigidly clamping the tool to the downhole joint, upper engaging means for engaging said next joint adjacent the lower end thereof and further engaging means for engaging the next joint at a higher point along the length thereof, characterised in that the tool is a casing stabbing tool, the upper engaging means are arranged to permit only relative rotational movement of said next joint, and in that the tool additionally comprises actuating means for moving said upper clamping means by regulation of hydraulic or pneumatic pressure, whereby said next joint may be partly or completely supported during stabbing and make-up without lateral movement.
- the upper clamping means comprises a number of opposed pairs of circumferentially arranged resilient idler rolls having a surface with a high co-efficient of friction and which engage said next joint and engage it axially, while allowing it to rotate during make-up of the threaded connection.
- the further engaging means are arranged to engage the upper end of the next joint at a position remote from the upper engaging means and to ensure alignment of the upper joint while permitting relative axial and rotational movement thereof.
- Heavy tools such as casing stabbing tools according to the present invention, which are freely suspended from the derrick of a floating drilling rig by a wire line tend to swing about due to wind forces and pitching, rolling and yawing movement of the rig, and require considerable manual strength for lateral manipulation from the rig floor.
- the suspended tool is thus difficult and dangerous to handle.
- the tool incorporates a drive mechanism for positioning a structure at a desired position between first and second points, the mechanism comprising a pulley housing having first and second sheaves and a fixed sheave mounted thereon, situated between said lead sheaves and fixed sheaves a traveling block having first and second sheaves and being arranged for reciprocal movement, drive means for driving the travelling block relatively to the housing, a first line having one end secured to said housing and running over the first sheave on the travelling block and the first lead sheave to the first fixed point, and a second line secured to said housing and running round the second travelling sheave and the fixed turning sheave and over said second lead sheave to said second fixed point, the arrangement being such that operation of the drive means in one direction to cause movement of the travelling block away from said lead sheaves and towards the fixed block shortens said first line and lengthens the second line by an equal amount to move the structure towards said first point, and reverse operation of the drive means causes the structure to move towards the second point, the tension in both
- the mechanism can conveniently be incorporated within the upstanding frame of the casing stabbing tool according to the invention in which case the first line is secured to the casing spider and the second line to an anchorage point on the rig.
- the drive means is a pneumatic or hydraulic cylinder which can be operated from the rig's supply.
- a casing stabbing tool 10 comprises a mast 12 having projecting laterally therefrom a first lower clamping assembly 14, a second lower clamping assembly 16, a first upper clamping assembly 18 and a second upper clamping assembly 20 having a lifting becket 21 secured thereto.
- Each lower clamping assembly 14, 16 comprises a platform 22, the lower platform being braced by a strut 24 and the upper by a strut 26.
- Each platform 22 has a mouth 28 for receiving a downhole casing joint 30 and which is provided with two arcuate abutment plates 32.
- Mounted on each platform 22 is a pneumatic ram 34 linked to two claws 36, 37 having arcuate linings 38 and capable of operating each independently to clamp the joint 30 securely againstlhepiates 32.
- Each upper clamping assembly 18, 20 is braced by a strut 39 and has a mouth 40 provided at the rear thereof with a narrow, semi-cylindrical collar 42.
- Pivotally mounted claws 44, 46 are independently operable by a pneumatic ram 48, these units being slightly smaller than the corresponding units on the lower platforms, to embrace an upper casing joint 50 to be added to the string.
- the tool 10 is suspended from a derrick by a wire tugger line attached to the becket 21.
- the rams 34 are actuated to close the two pairs of claws 36, 37' firmly around the joint 30 which is itself firmly embraced by a spider so as to clamp the whole tool 10 thereto.
- the upper joint 50 is then swung into position by the rig's lifting mechanism until its threaded frusto-conical lower end 52 is a short distance above the internally threaded collar 54 on the joint 30.
- the rams 48 are operated to close both sets of claws 44, 46 around the joint 50, bringing it into exact axial alignment with the joint 30 but still permitting axial and rotational movement thereof, so that it may thereafter be lowered or stabbed until the frusto-conical end 52 engages the mouth of the collar 54 and be subsequently rotated in the conventional manner until the threaded connection between the joints 30, 50 is fully made up.
- the modified tool 60 is shown in Figs. 4 and 5 generally resembles the tool 10 except that the fixed upper clamping assembly 18 is replaced by a moveable assembly 62 and the tapered mast 12 by a mast 64 of constant cross-section.
- the platform 22 of the assembly 62 is mounted on a sleeve 66 slidably received on the mast 64 and is moveable in a vertical direction by a pneumatic cylinder 86, supplied by an air-over-oil reservoir (not shown) and controlled by a pressure regulator (not shown).
- the platform mouth 40 has two arcuate plates 70 upstanding from the rear thereof and bears pivotally- mounted claws 72, 74, each provided with arcuate plates 76 and operable by a ram 78; each of the four plates 70, 76 has two vertically disposed rubber rollers 80 mounted thereon.
- the ram 78 may be replaced by a ram mounted along the length of the platform 22 (i.e. at right angles to the ram 78) and having a piston rod running in a guide frame to take lateral forces, the rod being pivotally connected to the ends of two push rods which are in turn pivotally connected at their other ends to the respective ends of the claws 72, 74.
- An adjustable stop in the form of a tapered pin is provided for the piston rod.
- the tool 60 is operated in generally the same way as the tool 10 except that when all the clamping assemblies 14, 16, 62, 20 are engaged with the respective casing joints 30, 50 the new joint 50 is held suspended co-axially above the lower joint 30 by the frictional action of the rollers 80.
- the joint 50 is then lowered gently by operating the pressure regulator to reduce the _pressure to slightly less than that required to support its weight and in this way only a very small proportion of the total load is borne by the threads during stabbing and subsequent rotation (which is allowed by the rollers 80) to make up the threaded connection.
- the claws and moveable platform may be operated hydraulically instead of pneumatically.
- the mast 12, 64 may be cut above the clamping assembly 18 or 62 and each end fitted with flanges that may be bolted together for convenience of transportation; a lifting bracket not shown may be provided on the top of the mast 12, 64; the plates 32, linings 38 and collars 42 may be made interchangeable by means of aligned apertures and a locking pin with other, different-sized members to match the size of casing used; and the mouths 28, 40 may be made to accept guides to receive smaller sizes of casing.
- a drive mechanism 110 as shown in Figs. 6 to 9 is housed largely within the lower part of a mast 112 of a casing stabbing tool and comprises a lower pulley housing 114 which is bolted to the flanged base of the mast 112 and houses a forward lead sheave 116 and coaxial aft lead sheave 118.
- a pneumatic cylinder 120 Located at the bottom of the mast 112 and mounted on the housing 114 is a pneumatic cylinder 120 in which is received for reciprocation a piston (not shown) and piston rod 122 which can be moved upwardly by compressed air admitted through line 124 and downwardly by compressed air admitted through line 126.
- an upper pulley housing 128 On the upper end of the cylinder 120 is mounted an upper pulley housing 128. which includes two upright channel-section members 130 between the upper ends of which is mounted an offset fixed sheave 132. Opposed guide rails 134 are mounted between the lower portions of the members 130 and receive the respective ends of spindles 138, 140 carried in a travelling pulley block 142 and solid with respective upper and lower travelling sheaves 144,146 each fitted with a retainer 148.
- a forward wire cable 150 extends from an anchorage point 152 on the cylinder 120, round the lower travelling sheave 146 down to the forward lead sheave 116and outthrough an aperture in the housing 114 to the casing spider (not shown).
- An aft wire cable 154 extends downwardly from an anchorage point 156 at the top of the upper housing 130 around the upper travelling sheave 144, upwardly and around the fixed sheave 132, down to the aft lead sheave 118 and out through an aperture in the rear of the housing 114 to an anchorage point (not shown) on the rig.
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Automatic Assembly (AREA)
Abstract
Description
- This invention relates to casing stabbing tools for use when a further casing joint (or section) of a string of steel casing joints lining a bore hole is being screwed to the uppermost joint of the string, said tools comprising a drive mechanism for positioning a structure, for example a mast, at a desired position between two points and restraining it from swinging about.
- US Specification US-A-2-2 450 934 discloses a well drill pipe handling apparatus comprising a frame which is fixedly mounted on the rig platform and supports, in ascending order, a work-holding tong for holding the top downhole drill pipe section, a tightening tong for finally tightening the next pipe section to be added, a rapid joint spinner and a manipulator arm for holding the lower portion of a suspended section to be added to the downhole section.
- Such an apparatus is for adding to the downhole pipe further sections of drill pipe which are only up to 18 mm in diameter and have coarse, robust conical threads not requiring precise alignment. The manipulator arm is for guiding the lower end of a 23-25 m drill pipe string, which is suspended from its upper end, into the correct position, and considerable skill is required to operate such a free-swinging manipulator arm.
- The above apparatus would not be adaptable to handling the joints of a casing string which have a diameter 2 or 3 times as great as that of drill pipe and much more delicate threads.
- An aim of the present invention is to provide a tool that is capable of handling such joints.
- According to the present invention there is provided a tool for facilitating screwing onto the upper threaded end of the uppermost downhole joint of a well string the lower threaded end of a next joint to be added to the string, the tool comprising an upstanding frame having mounted thereon lower clamping means for rigidly clamping the tool to the downhole joint, upper engaging means for engaging said next joint adjacent the lower end thereof and further engaging means for engaging the next joint at a higher point along the length thereof, characterised in that the tool is a casing stabbing tool, the upper engaging means are arranged to permit only relative rotational movement of said next joint, and in that the tool additionally comprises actuating means for moving said upper clamping means by regulation of hydraulic or pneumatic pressure, whereby said next joint may be partly or completely supported during stabbing and make-up without lateral movement.
- Preferably the upper clamping means comprises a number of opposed pairs of circumferentially arranged resilient idler rolls having a surface with a high co-efficient of friction and which engage said next joint and engage it axially, while allowing it to rotate during make-up of the threaded connection.
- Desirably the further engaging means are arranged to engage the upper end of the next joint at a position remote from the upper engaging means and to ensure alignment of the upper joint while permitting relative axial and rotational movement thereof.
- Heavy tools, such as casing stabbing tools according to the present invention, which are freely suspended from the derrick of a floating drilling rig by a wire line tend to swing about due to wind forces and pitching, rolling and yawing movement of the rig, and require considerable manual strength for lateral manipulation from the rig floor. The suspended tool is thus difficult and dangerous to handle.
- According to a preferred aspect of the present invention the tool incorporates a drive mechanism for positioning a structure at a desired position between first and second points, the mechanism comprising a pulley housing having first and second sheaves and a fixed sheave mounted thereon, situated between said lead sheaves and fixed sheaves a traveling block having first and second sheaves and being arranged for reciprocal movement, drive means for driving the travelling block relatively to the housing, a first line having one end secured to said housing and running over the first sheave on the travelling block and the first lead sheave to the first fixed point, and a second line secured to said housing and running round the second travelling sheave and the fixed turning sheave and over said second lead sheave to said second fixed point, the arrangement being such that operation of the drive means in one direction to cause movement of the travelling block away from said lead sheaves and towards the fixed block shortens said first line and lengthens the second line by an equal amount to move the structure towards said first point, and reverse operation of the drive means causes the structure to move towards the second point, the tension in both lines thus being always maintained to prevent displacement in either direction of the structure from said desired position.
- The mechanism can conveniently be incorporated within the upstanding frame of the casing stabbing tool according to the invention in which case the first line is secured to the casing spider and the second line to an anchorage point on the rig. Preferably the drive means is a pneumatic or hydraulic cylinder which can be operated from the rig's supply.
- An embodiment of each aspect of the present invention will now be described, by way of example, with reference to the accompanying diagrammatic drawings in which:-
- Figure 1 is an elevation of a casing stabbing tool according to a first aspect of the invention;
- Figure 2 is a section on the line A-A in Fig. 1;
- Figure 3 is a section on the line B-B of Fig. 1;
- Figure 4 is a partial elevation of a modification of the tool of Figs. 1 to 3 according to the second aspect of the invention;
- Figure 5 is a section on the line C-C of Fig. 4;
- Figure 6 is a front elevation of a drive mechanism according to the third aspect of the invention;
- Figure 7 is a section along the line A-A of Fig. 6;
- Figure 8 is a section on the line B-B of Fig. 7; and
- Figure 9 is an end elevation taken on the lefthand end of Fig. 7.
- As shown in Figs. 1 to 3 a
casing stabbing tool 10 comprises amast 12 having projecting laterally therefrom a firstlower clamping assembly 14, a secondlower clamping assembly 16, a firstupper clamping assembly 18 and a secondupper clamping assembly 20 having alifting becket 21 secured thereto. - Each
lower clamping assembly platform 22, the lower platform being braced by astrut 24 and the upper by astrut 26. Eachplatform 22 has amouth 28 for receiving adownhole casing joint 30 and which is provided with twoarcuate abutment plates 32. Mounted on eachplatform 22 is apneumatic ram 34 linked to twoclaws arcuate linings 38 and capable of operating each independently to clamp the joint 30 securely againstlhepiates 32. - Each
upper clamping assembly strut 39 and has amouth 40 provided at the rear thereof with a narrow,semi-cylindrical collar 42. Pivotally mountedclaws pneumatic ram 48, these units being slightly smaller than the corresponding units on the lower platforms, to embrace anupper casing joint 50 to be added to the string. - In use the
tool 10 is suspended from a derrick by a wire tugger line attached to thebecket 21. - To instal the
new joint 50 therams 34 are actuated to close the two pairs ofclaws 36, 37' firmly around thejoint 30 which is itself firmly embraced by a spider so as to clamp thewhole tool 10 thereto. Theupper joint 50 is then swung into position by the rig's lifting mechanism until its threaded frusto-conicallower end 52 is a short distance above the internally threadedcollar 54 on thejoint 30. With the joint 50 thus suspended therams 48 are operated to close both sets ofclaws conical end 52 engages the mouth of thecollar 54 and be subsequently rotated in the conventional manner until the threaded connection between thejoints - The modified
tool 60 is shown in Figs. 4 and 5 generally resembles thetool 10 except that the fixedupper clamping assembly 18 is replaced by amoveable assembly 62 and thetapered mast 12 by amast 64 of constant cross-section. - The
platform 22 of theassembly 62 is mounted on asleeve 66 slidably received on themast 64 and is moveable in a vertical direction by a pneumatic cylinder 86, supplied by an air-over-oil reservoir (not shown) and controlled by a pressure regulator (not shown). Theplatform mouth 40 has twoarcuate plates 70 upstanding from the rear thereof and bears pivotally- mountedclaws arcuate plates 76 and operable by aram 78; each of the fourplates rubber rollers 80 mounted thereon. - In an unillustrated alternative, the
ram 78 may be replaced by a ram mounted along the length of the platform 22 (i.e. at right angles to the ram 78) and having a piston rod running in a guide frame to take lateral forces, the rod being pivotally connected to the ends of two push rods which are in turn pivotally connected at their other ends to the respective ends of theclaws - The
tool 60 is operated in generally the same way as thetool 10 except that when all theclamping assemblies respective casing joints new joint 50 is held suspended co-axially above thelower joint 30 by the frictional action of therollers 80. Thejoint 50 is then lowered gently by operating the pressure regulator to reduce the _pressure to slightly less than that required to support its weight and in this way only a very small proportion of the total load is borne by the threads during stabbing and subsequent rotation (which is allowed by the rollers 80) to make up the threaded connection. - If desired, the claws and moveable platform may be operated hydraulically instead of pneumatically.
- In further modifications the
mast clamping assembly mast plates 32,linings 38 andcollars 42 may be made interchangeable by means of aligned apertures and a locking pin with other, different-sized members to match the size of casing used; and themouths - A
drive mechanism 110 as shown in Figs. 6 to 9 is housed largely within the lower part of amast 112 of a casing stabbing tool and comprises alower pulley housing 114 which is bolted to the flanged base of themast 112 and houses aforward lead sheave 116 and coaxialaft lead sheave 118. - Located at the bottom of the
mast 112 and mounted on thehousing 114 is apneumatic cylinder 120 in which is received for reciprocation a piston (not shown) andpiston rod 122 which can be moved upwardly by compressed air admitted throughline 124 and downwardly by compressed air admitted throughline 126. - On the upper end of the
cylinder 120 is mounted anupper pulley housing 128. which includes two upright channel-section members 130 between the upper ends of which is mounted an offset fixedsheave 132. Opposedguide rails 134 are mounted between the lower portions of themembers 130 and receive the respective ends ofspindles travelling pulley block 142 and solid with respective upper and lower travelling sheaves 144,146 each fitted with aretainer 148. - A
forward wire cable 150 extends from ananchorage point 152 on thecylinder 120, round thelower travelling sheave 146 down to the forward lead sheave 116and outthrough an aperture in thehousing 114 to the casing spider (not shown). - An
aft wire cable 154 extends downwardly from ananchorage point 156 at the top of theupper housing 130 around the upper travellingsheave 144, upwardly and around the fixedsheave 132, down to theaft lead sheave 118 and out through an aperture in the rear of thehousing 114 to an anchorage point (not shown) on the rig. - When compressed air is admitted to the
cylinder 120 through theline 124 thepiston rod 122 is extended upwardly carrying with it thetravelling block 142. Theforward cable 150 is pulled in by an amount equivalent to twice the length of the stroke, thus pulling thewhole mast 112 forward. This forward movement is permitted by the simultaneous paying out of an equivalent length of thecable 154 by virtue of the upward movement of thetravelling sheave 144. As both thecables mast 112 is located in the desired position between the forward and aft anchorage points and restrained from swinging about.
Claims (7)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8209525 | 1982-03-31 | ||
GB8209525 | 1982-03-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0105299A1 EP0105299A1 (en) | 1984-04-18 |
EP0105299B1 true EP0105299B1 (en) | 1986-10-15 |
Family
ID=10529435
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83901093A Expired EP0105299B1 (en) | 1982-03-31 | 1983-03-31 | Casing stabbing tools |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0105299B1 (en) |
NO (1) | NO834351L (en) |
WO (1) | WO1983003443A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4770336A (en) * | 1986-03-17 | 1988-09-13 | Howard Smith Screen Company | Well screen centralizer and method for constructing centralizer and for joining of well screens |
US6360633B2 (en) | 1997-01-29 | 2002-03-26 | Weatherford/Lamb, Inc. | Apparatus and method for aligning tubulars |
GB9701758D0 (en) | 1997-01-29 | 1997-03-19 | Weatherford Lamb | Apparatus and method for aligning tubulars |
GB2346576B (en) * | 1999-01-28 | 2003-08-13 | Weatherford Lamb | A rotary and a method for facilitating the connection of pipes |
GB2348844A (en) * | 1999-04-13 | 2000-10-18 | Weatherford Lamb | Apparatus and method for aligning tubulars |
NO334399B1 (en) * | 2011-11-29 | 2014-02-24 | Robotic Drilling Systems As | Device and method for use in mounting and disassembly of threaded tubes |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2450934A (en) * | 1946-05-25 | 1948-10-12 | Ingram X Calhoun | Well pipe handling apparatus |
US3659655A (en) * | 1970-06-02 | 1972-05-02 | Ingersoll Rand Co | Feed controlling method and system |
US4092881A (en) * | 1976-10-29 | 1978-06-06 | Christensen, Inc. | Apparatus for making-up and breaking threaded pipe connections |
DE2815705C2 (en) * | 1978-04-12 | 1986-10-16 | Rolf 3100 Celle Rüße | Method and device for centering casing pipes |
-
1983
- 1983-03-31 WO PCT/GB1983/000097 patent/WO1983003443A1/en active IP Right Grant
- 1983-03-31 EP EP83901093A patent/EP0105299B1/en not_active Expired
- 1983-11-25 NO NO834351A patent/NO834351L/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO1983003443A1 (en) | 1983-10-13 |
NO834351L (en) | 1983-11-25 |
EP0105299A1 (en) | 1984-04-18 |
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