CA2299765A1 - Rod puller - Google Patents
Rod puller Download PDFInfo
- Publication number
- CA2299765A1 CA2299765A1 CA002299765A CA2299765A CA2299765A1 CA 2299765 A1 CA2299765 A1 CA 2299765A1 CA 002299765 A CA002299765 A CA 002299765A CA 2299765 A CA2299765 A CA 2299765A CA 2299765 A1 CA2299765 A1 CA 2299765A1
- Authority
- CA
- Canada
- Prior art keywords
- rod
- coiled rod
- travelling block
- clamp
- coiled
- 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
- 238000000034 method Methods 0.000 claims description 15
- 230000003213 activating effect Effects 0.000 claims description 8
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000001154 acute effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
- E21B19/22—Handling reeled pipe or rod units, e.g. flexible drilling pipes
Landscapes
- 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)
Abstract
A rod pulling apparatus uses a clamp secured to a wellhead and a clamp secured to a travelling block of a conventional service rod to walk coiled rod into and out of a well. The clamps may move into gripping position by rotation of gripping blocks.
Coiled rod is guided by a rod guide through a split in the travelling block.
Coiled rod is guided by a rod guide through a split in the travelling block.
Description
TITLE OF THE INVENTION
Rod Puller NAMES OF INVENTORS
Scott W. Widney Richard L. Dedels FIELD OF THE INVENTION
This invention relates to rod pulling/injection equipment and methods of rod pulling and injection in wells.
BACKGROUND OF THE INVENTION
Various methods have been proposed for the handling of coiled rod in wells.
Corod of Canada has used a continuous chain system to inject coiled rod into wells and pull coiled rod out of wells. United States patent no. 5,992,516 of Palynchuk et al,
Rod Puller NAMES OF INVENTORS
Scott W. Widney Richard L. Dedels FIELD OF THE INVENTION
This invention relates to rod pulling/injection equipment and methods of rod pulling and injection in wells.
BACKGROUND OF THE INVENTION
Various methods have been proposed for the handling of coiled rod in wells.
Corod of Canada has used a continuous chain system to inject coiled rod into wells and pull coiled rod out of wells. United States patent no. 5,992,516 of Palynchuk et al,
2 0 issued November 30, 1999, shows a system in which clamps are moved on a frame to walk the coiled rod into and out of the well. This system works, but is expensive to build. The inventors have proposed a novel system of handling coiled rod that is less expensive and takes advantage of existing conventional rig equipment.
There is therefore proposed according to an aspect of the invention a rod handling system for wells, comprising a wellhead, a rig having a mast, a travelling block suspended on the mast and a drive mechanism for the travelling block arranged to move the travelling block along the mast, an upper clamp secured to the travelling
There is therefore proposed according to an aspect of the invention a rod handling system for wells, comprising a wellhead, a rig having a mast, a travelling block suspended on the mast and a drive mechanism for the travelling block arranged to move the travelling block along the mast, an upper clamp secured to the travelling
3 0 block, a lower clamp secured on the wellhead, and coiled rod extending from a coiled rod storage reel, through the upper clamp and lower clamp and into the wellhead.
According to another aspect of the invention, there is proposed a method of handling coiled rod in a well, comprising the steps of securing a lower clamp to a wellhead;
securing an upper clamp to a travelling block;
extending coiled rod from a storage reel through the upper clamp and lower clamp; and selectively gripping the coiled rod with one or both of the upper clamp and lower clamp to guide the coiled rod into and out of the well.
According to an aspect of the invention, when coiled rod is injected into the well, selectively gripping the coiled rod with one or both of the upper clamp and lower clamp comprises the steps of a) gripping the coiled rod with the upper clamp;
b) releasing the coiled rod from the lower clamp;
c) lowering the travelling block downward a pre-determined distance;
d) gripping the coiled rod with the lower clamp;
e) releasing the upper clamp;
f) returning the travelling block upward to an initial position; and 2 0 g) repeating steps a-f until a desired depth has been reached with the coiled rod.
According to a further aspect of the invention, when coiled rod is pulled from the well, selectively gripping the coiled rod with one or both of the upper clamp and lower clamp comprises the steps of a) gripping the coiled rod with the upper clamp;
2 5 b) releasing the coiled rod from the lower clamp;
c) pulling the travelling block upward a pre-determined distance;
d) gripping the coiled rod with the lower clamp;
e) releasing the upper clamp;
f) returning the travelling block downward to an initial position; and 3 0 g) repeating steps a-f until the coiled rod has been pulled up a desired distance.
In either pulling or injecting, the upper clamp and lower clamp are released from the coiled rod only when the other of the upper clamp or lower clamp has obtained 80%
of its full gripping pressure In other aspects of the invention: each of the upper and lower clamps preferably includes gripper blocks activated by respective cylinders to close on the coiled rod. The gripper blocks are preferably mounted on pivots to rotate into gripping position on the coiled rod or mounted for translational movement into gripping position on the coiled rod. The travelling block is preferably split to allow the coiled rod to pass through the travelling block. The coiled rod preferably passes through a guide terminating adjacent the travelling block, and the guide is secured to the mast of the rig (slant or vertical).
These and other aspects of the invention are described in the detailed description of the invention and claimed in the claims that follow.
BRIEF DESCRIPTION OF THE DRAWINGS
There will now be described preferred embodiments of the invention, with reference to the drawings, by way of illustration only and not with the intention of limiting the scope of the invention, in which like numerals denote like elements and in which:
2 0 Fig. 1 is a side view of vertical rig equipment with a travelling block and clamps according to the invention;
Fig. 2 is a view of the equipment shown in Fig. 1 at right angles to the view of Fig. 1;
Fig. 3 is a side view of slant rig equipment with a travelling block and clamps 2 5 according to the invention;
Fig. 3A shows a view of the slant rig of Fig. 3 from above at 45 degree angle and shows the length of the clamping stroke;
Fig. 4 is a view of the equipment shown in Fig. 3 at right angles to the view of Fig. 1 3 0 Fig. 5 is a side view showing in more detail clamps used in the embodiment of Fig. 1;
Fig. 6 is a view at right angles to the view of Fig. 5 showing the clamps and travelling block;
According to another aspect of the invention, there is proposed a method of handling coiled rod in a well, comprising the steps of securing a lower clamp to a wellhead;
securing an upper clamp to a travelling block;
extending coiled rod from a storage reel through the upper clamp and lower clamp; and selectively gripping the coiled rod with one or both of the upper clamp and lower clamp to guide the coiled rod into and out of the well.
According to an aspect of the invention, when coiled rod is injected into the well, selectively gripping the coiled rod with one or both of the upper clamp and lower clamp comprises the steps of a) gripping the coiled rod with the upper clamp;
b) releasing the coiled rod from the lower clamp;
c) lowering the travelling block downward a pre-determined distance;
d) gripping the coiled rod with the lower clamp;
e) releasing the upper clamp;
f) returning the travelling block upward to an initial position; and 2 0 g) repeating steps a-f until a desired depth has been reached with the coiled rod.
According to a further aspect of the invention, when coiled rod is pulled from the well, selectively gripping the coiled rod with one or both of the upper clamp and lower clamp comprises the steps of a) gripping the coiled rod with the upper clamp;
2 5 b) releasing the coiled rod from the lower clamp;
c) pulling the travelling block upward a pre-determined distance;
d) gripping the coiled rod with the lower clamp;
e) releasing the upper clamp;
f) returning the travelling block downward to an initial position; and 3 0 g) repeating steps a-f until the coiled rod has been pulled up a desired distance.
In either pulling or injecting, the upper clamp and lower clamp are released from the coiled rod only when the other of the upper clamp or lower clamp has obtained 80%
of its full gripping pressure In other aspects of the invention: each of the upper and lower clamps preferably includes gripper blocks activated by respective cylinders to close on the coiled rod. The gripper blocks are preferably mounted on pivots to rotate into gripping position on the coiled rod or mounted for translational movement into gripping position on the coiled rod. The travelling block is preferably split to allow the coiled rod to pass through the travelling block. The coiled rod preferably passes through a guide terminating adjacent the travelling block, and the guide is secured to the mast of the rig (slant or vertical).
These and other aspects of the invention are described in the detailed description of the invention and claimed in the claims that follow.
BRIEF DESCRIPTION OF THE DRAWINGS
There will now be described preferred embodiments of the invention, with reference to the drawings, by way of illustration only and not with the intention of limiting the scope of the invention, in which like numerals denote like elements and in which:
2 0 Fig. 1 is a side view of vertical rig equipment with a travelling block and clamps according to the invention;
Fig. 2 is a view of the equipment shown in Fig. 1 at right angles to the view of Fig. 1;
Fig. 3 is a side view of slant rig equipment with a travelling block and clamps 2 5 according to the invention;
Fig. 3A shows a view of the slant rig of Fig. 3 from above at 45 degree angle and shows the length of the clamping stroke;
Fig. 4 is a view of the equipment shown in Fig. 3 at right angles to the view of Fig. 1 3 0 Fig. 5 is a side view showing in more detail clamps used in the embodiment of Fig. 1;
Fig. 6 is a view at right angles to the view of Fig. 5 showing the clamps and travelling block;
4 Fig. 7A is a section through an embodiment of a clamp that could be used in the operation of the invention;
Fig. 7B is a section through the clamp of Fig. 7A along the line A-A;
Fig. 7C is a section through the clamp of Fig. 7A along the line B-B;
Fig. 8A is a section through another embodiment of a clamp that could be used in the operation of the invention;
Fig. 8B is a side view of the clamp of Fig. 8A as shown by indicators A-A; and Fig. 8C is a section through the clamp of Fig. 8 along the line B-B.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word in the sentence are included and that items not specifically mentioned are not excluded. The use of the indefinite article "a"
in the claims before an element means that one of the elements is specified, but does not specifically exclude others of the elements being present, unless, unless the context 2 0 clearly requires that there be one and only one of the elements.
Figs. l and 2 show a conventional vertical rig 10 located in position to inject coiled rod into a well or pull coiled rod from a well through wellhead 12.
Apart from the travelling block 14, rod guide 16, coiled rod 18 and clamps 22 and 24, the rig 10 is conventional and includes a mast 20, the travelling block 14 suspended in conventional 2 5 fashion from the mast 20 and a drive mechanism 26 for the travelling block 14 arranged to move the travelling block 14 along the mast 20. The rig 10 may be a flush-by, service rig, drilling rig, or other rig having a travelling block and drive mechanism.
The travelling block 14 may be conventional, but it is preferred to split the travelling block 14 as shown in Fig. 1 to allow the coiled rod 18 to pass between the two sides 14a and 3 0 14b of the travelling block 14. This arrangement allows the coiled rod 18 to suffer lower bending forces as it curves downward from rod guide 16 through the travelling block 14. The rod guide 16 is conventional as used in coiled rod applications, except
Fig. 7B is a section through the clamp of Fig. 7A along the line A-A;
Fig. 7C is a section through the clamp of Fig. 7A along the line B-B;
Fig. 8A is a section through another embodiment of a clamp that could be used in the operation of the invention;
Fig. 8B is a side view of the clamp of Fig. 8A as shown by indicators A-A; and Fig. 8C is a section through the clamp of Fig. 8 along the line B-B.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word in the sentence are included and that items not specifically mentioned are not excluded. The use of the indefinite article "a"
in the claims before an element means that one of the elements is specified, but does not specifically exclude others of the elements being present, unless, unless the context 2 0 clearly requires that there be one and only one of the elements.
Figs. l and 2 show a conventional vertical rig 10 located in position to inject coiled rod into a well or pull coiled rod from a well through wellhead 12.
Apart from the travelling block 14, rod guide 16, coiled rod 18 and clamps 22 and 24, the rig 10 is conventional and includes a mast 20, the travelling block 14 suspended in conventional 2 5 fashion from the mast 20 and a drive mechanism 26 for the travelling block 14 arranged to move the travelling block 14 along the mast 20. The rig 10 may be a flush-by, service rig, drilling rig, or other rig having a travelling block and drive mechanism.
The travelling block 14 may be conventional, but it is preferred to split the travelling block 14 as shown in Fig. 1 to allow the coiled rod 18 to pass between the two sides 14a and 3 0 14b of the travelling block 14. This arrangement allows the coiled rod 18 to suffer lower bending forces as it curves downward from rod guide 16 through the travelling block 14. The rod guide 16 is conventional as used in coiled rod applications, except
5 that it is secured to the mast 20 by a hinge 28 and supported by a wire 30 from the mast 20. The coiled rod 18 is supplied from a conventional carousel or storage reel 32.
Upper clamp 22 is secured to the travelling block 14 as for example by hanging from the travelling block 14. Lower clamp is secured on the wellhead 12 as for example by screws. The coiled rod 18 extends from the coiled rod storage reel 32, through the upper clamp 22 and lower clamp 24 and into the wellhead 12.
Figs. 3 and 4 show the same equipment as shown in Figs. l and 2, except that the rig is a slant rig 11 for use with a slant well 13, with slanted mast 21, on which the travelling block 14 slides along tracks 34 on the mast 21. The rod guide 36 in this system is provided with a swivel point 38 to accommodate the motion of the travelling block 14 along the tracks 34.
Figs. 5 and 6 show in more detail the location of the travelling block 14 upper clamp 22, lower block 24 and wellhead 12. The upper clamp 22 hangs on hangers from the travelling block 14. Upper clamp 22 is shown with gripper blocks 40 open, while lower clamp 24 is shown with gripper blocks 40 closed.
2 0 Referring to Figs. 7A, 7B and 7C, an embodiment of the upper and lower clamps 22, 24 is shown in which the gripper blocks 40a, 40b rotate about pivots 42a, 42b respectively.
The exemplary clamp shown may be used for both upper clamp 22 and lower clamp 24.
The clamp is formed from a frame 44 with hanger ears 46 on opposite sides that are held by hangers 39 on the travelling block 14. The frame 44 has two sections 44a and 2 5 44b.
A first section 44a incorporates gripper blocks 40a, 40b that rotate about pivots 42a, 42b secured to the frame 44. The gripper blocks 40a, 40b have gripping surfaces 41 that are intended to minimize damage to the coiled rod 18. The surface is described in United States patent no. 5,992,516 issued November 30, 1999. Each gripper block 40a, 3 0 40b is formed from a main block 48a, 48b which receives the pivot 42a, 42b respectively. Extending from the blocks 48a, 48b are a pair of walls SOa, SOb respectively which retain gripper pads 52a, 52b. The gripper pads 52a, 52b each have a slot 54 running down the length of the front surface 41 and cross-wise slots 56 cutting
Upper clamp 22 is secured to the travelling block 14 as for example by hanging from the travelling block 14. Lower clamp is secured on the wellhead 12 as for example by screws. The coiled rod 18 extends from the coiled rod storage reel 32, through the upper clamp 22 and lower clamp 24 and into the wellhead 12.
Figs. 3 and 4 show the same equipment as shown in Figs. l and 2, except that the rig is a slant rig 11 for use with a slant well 13, with slanted mast 21, on which the travelling block 14 slides along tracks 34 on the mast 21. The rod guide 36 in this system is provided with a swivel point 38 to accommodate the motion of the travelling block 14 along the tracks 34.
Figs. 5 and 6 show in more detail the location of the travelling block 14 upper clamp 22, lower block 24 and wellhead 12. The upper clamp 22 hangs on hangers from the travelling block 14. Upper clamp 22 is shown with gripper blocks 40 open, while lower clamp 24 is shown with gripper blocks 40 closed.
2 0 Referring to Figs. 7A, 7B and 7C, an embodiment of the upper and lower clamps 22, 24 is shown in which the gripper blocks 40a, 40b rotate about pivots 42a, 42b respectively.
The exemplary clamp shown may be used for both upper clamp 22 and lower clamp 24.
The clamp is formed from a frame 44 with hanger ears 46 on opposite sides that are held by hangers 39 on the travelling block 14. The frame 44 has two sections 44a and 2 5 44b.
A first section 44a incorporates gripper blocks 40a, 40b that rotate about pivots 42a, 42b secured to the frame 44. The gripper blocks 40a, 40b have gripping surfaces 41 that are intended to minimize damage to the coiled rod 18. The surface is described in United States patent no. 5,992,516 issued November 30, 1999. Each gripper block 40a, 3 0 40b is formed from a main block 48a, 48b which receives the pivot 42a, 42b respectively. Extending from the blocks 48a, 48b are a pair of walls SOa, SOb respectively which retain gripper pads 52a, 52b. The gripper pads 52a, 52b each have a slot 54 running down the length of the front surface 41 and cross-wise slots 56 cutting
6 across the front surface 41. The cross-wise slots 56 become more closely spaced towards the downward end of the clamp, which permits a relatively uniform stress distribution. The slots 56 should be considerably thinner than the material of the gripper pads 52 between the slots 56. The walls 50 of one gripper block 40a should extend beyond the surface 41, while the walls 50 of the other gripper block 40b should be retracted. This construction helps to prevent walk out of the coiled rod 14.
The gripper pads 52 are preferably mounted on the clamps 22, 24 such that they are readily removable, as by bolting. The front surface 41 should have a sufficiently smooth surface, free of sharp teeth, or sharp edges, that well string gripped by the gripping dies is not damaged or scratched by the gripping dies during operation.
Frame section 44b houses a cylinder 60 which is used to activate the gripper blocks 40a, 40b. The cylinder 60 is provided with drive fluid from a conventional source not shown. A piston rod 62 slides in the cylinder 60 and is connected to the gripper blocks 40a, 40b by a gripper block activating arm 64 and pivot arms 66 and 68.
The rod 62 is pivotally attached to the gripper block activating arm 64 at pivot 70. One 2 0 end of the activating arm 64 is pivotally attached to pivot arm 66 at pivot 72. An intermediate part of the activating arm 64 located at an elbow 65 pivotally attaches to pivot arm 68 through a slot 74 through which runs a pivot pin 76. Pivot arm 66 is pivotally attached to the frame section 44a at pivot 42a and to the gripper block 40a at pivot pin 78. Pivot arm 66 forms an acute angle. Pivot arm 68 is pivotally secured to the 2 5 frame section 44a at pivot 42b and to the gripper block 40b at pivot pin 80. Pivot arm 68 forms an obtuse angle. As the rod 62 moves out of the cylinder 60, arm 64 moves to the left in the Figs. 7A-7C, which rotates arm 66 counterclockwise and arm 68 clockwise, which closes the gripper blocks 40a, 40b together to grip coiled rod between them. The gripper blocks 40a, 40b rotate into position against slips 82 which are secured to the 3 0 frame 44a. Slips 82 ensure that any downward slippage motion of the gripper blocks 40a, 40b tends to force the blocks together.
Refernng now to Figs. 8A, 8B and 8C, a further embodiment of a clamp is shown that can be used as either the upper clamp 22 or lower clamp 24. The clamp is
The gripper pads 52 are preferably mounted on the clamps 22, 24 such that they are readily removable, as by bolting. The front surface 41 should have a sufficiently smooth surface, free of sharp teeth, or sharp edges, that well string gripped by the gripping dies is not damaged or scratched by the gripping dies during operation.
Frame section 44b houses a cylinder 60 which is used to activate the gripper blocks 40a, 40b. The cylinder 60 is provided with drive fluid from a conventional source not shown. A piston rod 62 slides in the cylinder 60 and is connected to the gripper blocks 40a, 40b by a gripper block activating arm 64 and pivot arms 66 and 68.
The rod 62 is pivotally attached to the gripper block activating arm 64 at pivot 70. One 2 0 end of the activating arm 64 is pivotally attached to pivot arm 66 at pivot 72. An intermediate part of the activating arm 64 located at an elbow 65 pivotally attaches to pivot arm 68 through a slot 74 through which runs a pivot pin 76. Pivot arm 66 is pivotally attached to the frame section 44a at pivot 42a and to the gripper block 40a at pivot pin 78. Pivot arm 66 forms an acute angle. Pivot arm 68 is pivotally secured to the 2 5 frame section 44a at pivot 42b and to the gripper block 40b at pivot pin 80. Pivot arm 68 forms an obtuse angle. As the rod 62 moves out of the cylinder 60, arm 64 moves to the left in the Figs. 7A-7C, which rotates arm 66 counterclockwise and arm 68 clockwise, which closes the gripper blocks 40a, 40b together to grip coiled rod between them. The gripper blocks 40a, 40b rotate into position against slips 82 which are secured to the 3 0 frame 44a. Slips 82 ensure that any downward slippage motion of the gripper blocks 40a, 40b tends to force the blocks together.
Refernng now to Figs. 8A, 8B and 8C, a further embodiment of a clamp is shown that can be used as either the upper clamp 22 or lower clamp 24. The clamp is
7 formed from a frame 90 defined by side plates 92 and cross-pieces 94. A
cylinder 96 is secured as by bolting between the side plates 92 and has a piston rod 98 extending out from the cylinder 96. One gripper block 100 is mounted on an end of the piston rod 98 remote from the cylinder 96 and another gripper block 102 is mounted in a fixed position, as by bolting, between the side plates 92. Gripper pads 104, designed in the same way as gripper pads 52, are secured in the gripper blocks 100 and 102.
The gripper blocks 100, 102 are arranged so that at the full travel of the piston rod 98 to the right in the drawing, the gap between the gripper pads 104 is slightly less than the thickness of the rod that is intended to be gripped by the gripper pads 104. Plates 106 are secured to the top and bottom of the gripper block 100 and extend beyond the side plates 92, preferably on each side of the frame 90. An adjustable stop for the return travel of the gripper block 100 is formed by a stopper plate 108 that runs across the top of the plates 92 from side to side between the cylinder 96 and the gripper block 100. The stopper plate 108 is mounted on pneumatic cylinders 110 secured to the plates 92 on each side of the frame 90. In normal operation, the movement of the piston rod 98 away from the 2 0 rod being pulled or injected is restrained by the stopper plate 108. When it is desired to increase the range of movement of the gripper block 100, the pneumatic cylinders 110 are activated to lift the stopper plate 108 off the plates 92 and allow extended travel of the gripper block 100.
The operation of the apparatus thus described is as follows. Continuous or 2 5 coiled rod is handled in the well by first securing the lower clamp to the wellhead, securing the upper clamp to the travelling block of a conventional rig, extending coiled rod from a storage reel through the upper clamp and lower clamp and selectively gripping the coiled rod with one or both of the upper clamp and lower clamp to guide the coiled rod into and out of the well.
3 0 For injection of coiled rod into the well, the clamp operation is as follows:
a) gripping the coiled rod with the upper clamp;
b) releasing the coiled rod from the lower clamp;
c) lowering the travelling block downward a pre-determined distance;
cylinder 96 is secured as by bolting between the side plates 92 and has a piston rod 98 extending out from the cylinder 96. One gripper block 100 is mounted on an end of the piston rod 98 remote from the cylinder 96 and another gripper block 102 is mounted in a fixed position, as by bolting, between the side plates 92. Gripper pads 104, designed in the same way as gripper pads 52, are secured in the gripper blocks 100 and 102.
The gripper blocks 100, 102 are arranged so that at the full travel of the piston rod 98 to the right in the drawing, the gap between the gripper pads 104 is slightly less than the thickness of the rod that is intended to be gripped by the gripper pads 104. Plates 106 are secured to the top and bottom of the gripper block 100 and extend beyond the side plates 92, preferably on each side of the frame 90. An adjustable stop for the return travel of the gripper block 100 is formed by a stopper plate 108 that runs across the top of the plates 92 from side to side between the cylinder 96 and the gripper block 100. The stopper plate 108 is mounted on pneumatic cylinders 110 secured to the plates 92 on each side of the frame 90. In normal operation, the movement of the piston rod 98 away from the 2 0 rod being pulled or injected is restrained by the stopper plate 108. When it is desired to increase the range of movement of the gripper block 100, the pneumatic cylinders 110 are activated to lift the stopper plate 108 off the plates 92 and allow extended travel of the gripper block 100.
The operation of the apparatus thus described is as follows. Continuous or 2 5 coiled rod is handled in the well by first securing the lower clamp to the wellhead, securing the upper clamp to the travelling block of a conventional rig, extending coiled rod from a storage reel through the upper clamp and lower clamp and selectively gripping the coiled rod with one or both of the upper clamp and lower clamp to guide the coiled rod into and out of the well.
3 0 For injection of coiled rod into the well, the clamp operation is as follows:
a) gripping the coiled rod with the upper clamp;
b) releasing the coiled rod from the lower clamp;
c) lowering the travelling block downward a pre-determined distance;
8 d) gripping the coiled rod with the lower clamp;
e) releasing the upper clamp;
f) returning the travelling block upward to an initial position; and g) repeating steps a-f until a desired depth has been reached with the coiled rod.
The upper clamp or lower clamp (as the case may be) is released from the coiled rod only when the other of the upper clamp or lower clamp has obtained 80% of its full gripping pressure.
For pulling of coiled rod from the well, the operation is as follows:
a) gripping the coiled rod with the upper clamp;
b) releasing the coiled rod from the lower clamp;
c) pulling the travelling block upward a pre-determined distance;
d) gripping the coiled rod with the lower clamp;
e) releasing the upper clamp;
f) returning the travelling block downward to an initial position; and g) repeating steps a-f until the coiled rod has been pulled up a desired distance.
As with injection, the upper clamp and lower clamp are released from the coiled rod only when the other of the upper clamp or lower clamp has obtained 80% of its full gripping pressure.
The above described clamps are preferably used in the method, so that selectively gripping the coiled rod with the upper and lower clamps includes activating 2 5 gripper blocks on the respective upper and lower clamps by respective cylinders to close on the coiled rod. The coiled rod passes through the split in the travelling block for most effective use.
Hydraulics for the operation of the clamps may be readily designed, and one such design for the hydraulics is shown in United States patent no. 5,992,516 issued 3 0 November 30, 1999. The hydraulics need to be operated in conjunction with the operation of the travelling block on the rig.
e) releasing the upper clamp;
f) returning the travelling block upward to an initial position; and g) repeating steps a-f until a desired depth has been reached with the coiled rod.
The upper clamp or lower clamp (as the case may be) is released from the coiled rod only when the other of the upper clamp or lower clamp has obtained 80% of its full gripping pressure.
For pulling of coiled rod from the well, the operation is as follows:
a) gripping the coiled rod with the upper clamp;
b) releasing the coiled rod from the lower clamp;
c) pulling the travelling block upward a pre-determined distance;
d) gripping the coiled rod with the lower clamp;
e) releasing the upper clamp;
f) returning the travelling block downward to an initial position; and g) repeating steps a-f until the coiled rod has been pulled up a desired distance.
As with injection, the upper clamp and lower clamp are released from the coiled rod only when the other of the upper clamp or lower clamp has obtained 80% of its full gripping pressure.
The above described clamps are preferably used in the method, so that selectively gripping the coiled rod with the upper and lower clamps includes activating 2 5 gripper blocks on the respective upper and lower clamps by respective cylinders to close on the coiled rod. The coiled rod passes through the split in the travelling block for most effective use.
Hydraulics for the operation of the clamps may be readily designed, and one such design for the hydraulics is shown in United States patent no. 5,992,516 issued 3 0 November 30, 1999. The hydraulics need to be operated in conjunction with the operation of the travelling block on the rig.
9 A person skilled in the art could make immaterial modifications to the invention described in this patent document without departing from the essence of the invention that is intended to be covered by the scope of the claims that follow.
Claims (20)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A rod handling system for wells, comprising:
a wellhead;
a rig having a mast, a travelling block suspended on the mast and a drive mechanism for the travelling block arranged to move the travelling block along the mast;
an upper clamp secured to the travelling block;
a lower clamp secured on the wellhead; and coiled rod extending from a coiled rod storage reel, through the upper clamp and lower clamp and into the wellhead.
a wellhead;
a rig having a mast, a travelling block suspended on the mast and a drive mechanism for the travelling block arranged to move the travelling block along the mast;
an upper clamp secured to the travelling block;
a lower clamp secured on the wellhead; and coiled rod extending from a coiled rod storage reel, through the upper clamp and lower clamp and into the wellhead.
2. The rod handling system of claim 1 in which each of the upper and lower clamps includes gripper blocks activated by respective cylinders to close on the coiled rod.
3. The rod handling system of claim 2 in which the gripper blocks are mounted on pivots to rotate into gripping position on the coiled rod.
4. The rod handling system of claim 2 in which the gripper blocks are mounted for translational movement into gripping position on the coiled rod.
5. The rod handling system of claim 1 in which the travelling block is split to allow the coiled rod to pass through the travelling block.
6. The rod handling system of claim 1 in which the coiled rod passes through a guide terminating adjacent the travelling block.
7. The rod handling system of claim 6 in which the guide is secured to the mast of the rig.
8. The rod handling system of claim 1 in which the rig is a vertical rig.
9. The rod handling system of claim 1 in which the rig is a slant rig and the travelling block is mounted on tracks on the mast.
10. A method of handling coiled rod in a well, comprising the steps of:
securing a lower clamp to a wellhead;
securing an upper clamp to a travelling block;
extending coiled rod from a storage reel through the upper clamp and lower clamp; and selectively gripping the coiled rod with one or both of the upper clamp and lower clamp to guide the coiled rod into and out of the well.
securing a lower clamp to a wellhead;
securing an upper clamp to a travelling block;
extending coiled rod from a storage reel through the upper clamp and lower clamp; and selectively gripping the coiled rod with one or both of the upper clamp and lower clamp to guide the coiled rod into and out of the well.
11. The method of claim 10 in which the coiled rod is injected into the well and selectively gripping the coiled rod with one or both of the upper clamp and lower clamp comprises the steps of:
a) gripping the coiled rod with the upper clamp;
b) releasing the coiled rod from the lower clamp;
c) lowering the travelling block downward a pre-determined distance;
d) gripping the coiled rod with the lower clamp;
e) releasing the upper clamp;
f) returning the travelling block upward to an initial position; and g) repeating steps a-f until a desired depth has been reached with the coiled rod.
a) gripping the coiled rod with the upper clamp;
b) releasing the coiled rod from the lower clamp;
c) lowering the travelling block downward a pre-determined distance;
d) gripping the coiled rod with the lower clamp;
e) releasing the upper clamp;
f) returning the travelling block upward to an initial position; and g) repeating steps a-f until a desired depth has been reached with the coiled rod.
12. The method of claim 11 in which the upper clamp or lower clamp is released from the coiled rod only when the other of the upper clamp or lower clamp has obtained 80% of its full gripping pressure.
13. The method of claim 10 in which the coiled rod is pulled from the well and selectively gripping the coiled rod with one or both of the upper clamp and lower clamp comprises the steps of:
a) gripping the coiled rod with the upper clamp;
b) releasing the coiled rod from the lower clamp;
c) pulling the travelling block upward a pre-determined distance;
d) gripping the coiled rod with the lower clamp;
e) releasing the upper clamp;
f) returning the travelling block downward to an initial position; and g) repeating steps a-f until the coiled rod has been pulled up a desired distance.
a) gripping the coiled rod with the upper clamp;
b) releasing the coiled rod from the lower clamp;
c) pulling the travelling block upward a pre-determined distance;
d) gripping the coiled rod with the lower clamp;
e) releasing the upper clamp;
f) returning the travelling block downward to an initial position; and g) repeating steps a-f until the coiled rod has been pulled up a desired distance.
14. The method of claim 13 in which the upper clamp and lower clamp are released from the coiled rod only when the other of the upper clamp or lower clamp has obtained 80% of its full gripping pressure.
15. The method of claim 10 in which selectively gripping the coiled rod with the upper and lower clamps includes activating gripper blocks on the respective upper and lower clamps by respective cylinders to close on the coiled rod.
16. The method of claim 15 in which activating the gripper blocks comprises rotating the gripping blocks into gripping position on the coiled rod.
17. The method of claim 15 in which activating the gripper blocks comprises moving the gripper blocks by translational movement into gripping position on the coiled rod.
18. The method of claim 10 in which extending the coiled rod comprises guiding the coiled rod through a split in the travelling block.
19. The method of claim 10 in which the travelling block is suspended from a vertical rig.
20. The method of claim 10 in which the travelling block is suspended from a slant rig having a mast and the travelling block is mounted on tracks on the mast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002299765A CA2299765A1 (en) | 2000-02-29 | 2000-02-29 | Rod puller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002299765A CA2299765A1 (en) | 2000-02-29 | 2000-02-29 | Rod puller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2299765A1 true CA2299765A1 (en) | 2001-08-29 |
Family
ID=4165410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002299765A Abandoned CA2299765A1 (en) | 2000-02-29 | 2000-02-29 | Rod puller |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2299765A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6880630B2 (en) | 2002-12-19 | 2005-04-19 | C-Tech Energy Services, Inc. | Guide support for rig mounted continuous feed injection unit |
| US6880629B2 (en) | 2002-12-19 | 2005-04-19 | C-Tech Energy Services, Inc. | Well string injection system with gripper pads |
| CN109083606A (en) * | 2018-10-09 | 2018-12-25 | 鼎实智能装备（青岛）有限公司 | A kind of drilling and repairing well suspension type comb manipulator |
| US10995563B2 (en) | 2017-01-18 | 2021-05-04 | Minex Crc Ltd | Rotary drill head for coiled tubing drilling apparatus |
| US11499549B2 (en) | 2016-06-10 | 2022-11-15 | Activate Artificial Lift Inc. | Progressing cavity pump and methods of operation |
-
2000
- 2000-02-29 CA CA002299765A patent/CA2299765A1/en not_active Abandoned
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6880630B2 (en) | 2002-12-19 | 2005-04-19 | C-Tech Energy Services, Inc. | Guide support for rig mounted continuous feed injection unit |
| US6880629B2 (en) | 2002-12-19 | 2005-04-19 | C-Tech Energy Services, Inc. | Well string injection system with gripper pads |
| US11499549B2 (en) | 2016-06-10 | 2022-11-15 | Activate Artificial Lift Inc. | Progressing cavity pump and methods of operation |
| US10995563B2 (en) | 2017-01-18 | 2021-05-04 | Minex Crc Ltd | Rotary drill head for coiled tubing drilling apparatus |
| US11136837B2 (en) | 2017-01-18 | 2021-10-05 | Minex Crc Ltd | Mobile coiled tubing drilling apparatus |
| CN109083606A (en) * | 2018-10-09 | 2018-12-25 | 鼎实智能装备（青岛）有限公司 | A kind of drilling and repairing well suspension type comb manipulator |
| CN109083606B (en) * | 2018-10-09 | 2024-01-12 | 鼎实智能装备（青岛）有限公司 | Suspension type calandria manipulator for drilling and repairing well |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |