CN114183081A - Releasing and deblocking combined hydraulic packer and operation method thereof - Google Patents
Releasing and deblocking combined hydraulic packer and operation method thereof Download PDFInfo
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- CN114183081A CN114183081A CN202010959295.0A CN202010959295A CN114183081A CN 114183081 A CN114183081 A CN 114183081A CN 202010959295 A CN202010959295 A CN 202010959295A CN 114183081 A CN114183081 A CN 114183081A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000007246 mechanism Effects 0.000 claims abstract description 153
- 210000000078 claw Anatomy 0.000 claims abstract description 28
- 239000002131 composite material Substances 0.000 claims abstract description 18
- 238000010008 shearing Methods 0.000 claims description 20
- 238000007599 discharging Methods 0.000 claims description 5
- 238000002347 injection Methods 0.000 abstract description 5
- 239000007924 injection Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 238000011161 development Methods 0.000 description 4
- 238000003801 milling Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
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- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/021—Devices for subsurface connecting or disconnecting by rotation
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- 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
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Abstract
The invention relates to a releasing and deblocking combined type hydraulic packer and an operation method thereof, which are applied to layered injection and production of an oil field. The packer comprises a releasing mechanism and a safety fishing mechanism which are connected, wherein the safety fishing mechanism comprises a releasing shoulder and a throwing ring which are matched. The releasing mechanism can be a hydraulic locking claw composite releasing mechanism, a locking block type releasing mechanism, a nut type releasing mechanism or a left-handed releasing mechanism. The unsealing step comprises: releasing the packer by the releasing mechanism, lifting the pipe column to drive the releasing well outlet mechanism to move upwards, and hanging the releasing shoulder on the releasing ring to pull up the releasing pipe to release the packer; when the packer is stuck, the releasing ring is cut off, and the releasing well outlet mechanism is lifted out of the shaft; and fishing and unsealing the packer by using a lower fishing tool. The packer of the invention integrates the releasing mechanism and the safe fishing mechanism, which saves one time of fishing pipe column compared with the original Y445 type packer and saves the operation cost.
Description
Technical Field
The invention relates to the technical field of downhole packers for oil field development in the petroleum industry, in particular to a releasing and deblocking combined type hydraulic packer and an operation method thereof.
Background
In the development of oil fields, downhole packers are one of the key tools for the layered production of oil fields. The hydraulic type packer includes Y441 type and Y445 type. CO developed in recent years2The gas injection string is separately provided with the two packers. After the packer works for a long time in the well, the packer can be subjected to the problem of abnormal working of a mechanism and can not be unsealed normally because fouling is subjected to the blockage or falling object blockage.
In order to provide convenience for the next step treatment work after the Y441 type packer meets the blockage in the well, a safety joint is connected to the upper side of the Y441 type packer on the structural matching of a common downhole tubular column, when the packer meets the blockage and can not be normally unsealed, the safety joint is firstly disconnected, then a tool is used for salvaging the packer, and if the salvaging and the deblocking are unsuccessful, the packer is removed by milling. Such a procedure presents a problem in that the connection of a safety joint in the upper part of the packer adds a considerable amount of work to the next possible casing milling operation.
The Y445 packer is a tool that fuses together the Y441 packer and a safety joint. Y445 packers are commonly used as downhole bridge plugs. The general operation procedures are as follows: the method comprises the following steps of setting a packer, setting, releasing, pulling out a releasing tubular column, working in a well, fishing by a lower fishing tool and unsealing the packer. For conventional use this is not a problem, however, if the Y445 packer is not to be tripped, the above-described operation steps must be performed to remove the packer from the wellbore. Such as: development of Wangshije secondary compression Y445 type packer [ J ] Petroleum machinery, 2014, 42 (11): 163 ~ 165, this packer is installed on the gas injection tubular column, and the gas injection in-process is not released, just releases when pulling out the packer, and fishing tool deblocking packer down again. Compared with the Y441 type gas injection pipe column, the fishing pipe column is added one time when the packer is taken out, and the operation cost is increased.
Disclosure of Invention
In order to solve the technical problem, the invention provides a releasing and deblocking combined type hydraulic packer and an operation method thereof. The packer disclosed by the invention combines the functions of a safety joint, a Y441 packer and a Y445 packer, has a safety releasing function, also has a function of directly unsealing the packer without fishing a pipe column in another time, and is compact in tool structure and less in material consumption.
In order to achieve the purpose, the invention adopts the following technical scheme:
the releasing and deblocking combined type hydraulic packer comprises a releasing mechanism, wherein the releasing mechanism is further connected with a safety fishing mechanism, the safety fishing mechanism comprises a releasing shoulder and a releasing ring which are matched, and the releasing shoulder and the releasing ring are respectively arranged on a releasing pipe and a releasing well outlet mechanism of the packer.
As a preferred embodiment, the releasing mechanism is a hydraulic locking claw composite releasing mechanism which comprises a releasing claw, a releasing thread and a releasing piston, the releasing thread is a left-handed thread, the releasing claw is connected with the outer barrel of the packer through the releasing thread, and the inner lining of the releasing piston is arranged at the lower releasing thread of the releasing claw.
As a preferred embodiment, the releasing mechanism is a locking block type releasing mechanism, the locking block type releasing mechanism comprises a locking block and a releasing piston, the outer barrel of the packer, the locking block, the releasing piston and the valve seat pipe are coaxially sleeved together, a radial hole is formed in the side wall of the locking joint, the locking block is installed in the radial hole, and the outer side of the locking block is arranged in an inner annular groove of the outer barrel of the packer.
As a preferred embodiment, the releasing mechanism is a nut type releasing mechanism, and left-handed releasing threads are arranged on a releasing nut. The nut type releasing mechanism comprises an inner releasing nut, a releasing thread and a bearing ring; the inner hole of the inner releasing nut is provided with a releasing thread, and the inner releasing nut is connected with the screw joint through the releasing thread; the outer wall of the inner releasing nut is provided with a key groove, and correspondingly, the inner wall of the outer barrel of the packer is provided with an inner key protrusion matched with the key groove; the periphery of the bearing ring is arranged in an inner groove of the outer barrel of the packer, and the inner wall of the bearing ring is arranged in an outer ring groove formed by the spiral joint and the inner releasing nut. The nut-type releasing mechanism can also be arranged in such a way that the nut-type releasing mechanism comprises an outer releasing nut, a releasing thread and a bearing ring; the outer wall of the outer releasing nut is provided with releasing threads, and the outer releasing nut is connected with the outer barrel of the packer through the releasing threads; the inner wall of the outer releasing nut is provided with a key groove, and correspondingly, the outer wall of the key groove joint is provided with an outer key protrusion matched with the key groove; the periphery of the bearing ring is arranged in an inner groove of the outer barrel of the packer, and the inner wall of the bearing ring is arranged in an outer ring groove formed by the keyway joint and the outer releasing nut.
As a preferred embodiment, the releasing mechanism is a left-handed releasing mechanism, the left-handed releasing mechanism comprises releasing threads, and the releasing joint is connected with the outer barrel of the packer through the left-handed releasing threads.
As a preferred embodiment, the releasing ring is circular, partially circular or a shear pin.
The operation method for releasing the composite hydraulic packer applied to the releasing and the composite hydraulic packer containing the hydraulic locking claw composite releasing mechanism or the locking block type releasing mechanism comprises the following steps of:
a. throwing a throwing ball from the oil pipe, and driving a hydraulic shearing piston shear pin to enable a throwing piston to descend;
b. lifting the pipe column to drive the releasing well outlet mechanism to move upwards, and hanging a releasing shoulder on a releasing ring to pull up a releasing pipe to release the packer;
c. when the packer is stuck, the releasing ring is cut off, and the releasing well outlet mechanism is lifted out of the shaft;
d. and fishing and unsealing the packer by using a lower fishing tool.
The operation method applied to the releasing and deblocking composite hydraulic packer with the nut type releasing mechanism or the left-handed releasing mechanism comprises the following steps:
a. the oil pipe rotates forwards to unscrew the releasing thread, and the releasing and discharging mechanism is disconnected with the outer barrel of the packer;
b. lifting the pipe column to drive the releasing well outlet mechanism to move upwards, and hanging a releasing shoulder on a releasing ring to pull up a releasing pipe to release the packer;
c. when the packer is stuck, the releasing ring is cut off, and the releasing well outlet mechanism is lifted out of the shaft;
d. and fishing and unsealing the packer by using a lower fishing tool.
The technical advantages of the invention are as follows:
1. the packer has multiple functions. The packer disclosed by the invention combines the functions of a safety joint, a Y441 packer and a Y445 packer, and has four functions of releasing, directly lifting an original well pipe column to release the packer, safely releasing and fishing the packer by a lower tool. When the packer is removed for operation, the packer is released first, so that the function of the safety joint for preventing the packer from being released first when the packer is blocked is met; after releasing the packer, the original well pipe column is directly lifted up to unseal the packer, so that the packer has the characteristics of a Y441-type packer; if the packer is unlocked, the packer is lifted up to cut the lost ring, and the original well pipe column is firstly started, so that the packer has the function of a safety joint; the lower fishing tool salvages and unsets the packer, again a feature of type Y445.
2. The structure is compact. Because the packer of the invention integrates the releasing mechanism and the safe fishing mechanism, compared with the use combination of the Y441 type packer and the safe joint, the packer of the invention has shorter length, less material consumption and lower processing cost, and when the packer needs to be removed by milling in the later period, the operation milling length is short, the workload is less and the operation cost is lower.
3. The fishing process of the Y445 type packer is reduced. The packer of the invention does not need to be released to take out the original well pipe column first and then the fishing tool is put down to unseal the packer, but the original well pipe column is directly lifted to unseal the packer after being released, thus saving the operation cost by one time of fishing the pipe column compared with the original Y445 type packer.
Drawings
A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein the accompanying drawings are included to provide a further understanding of the invention and form a part of this specification, and the illustrated embodiments and descriptions thereof are intended to illustrate and not limit the invention. Wherein:
fig. 1 is a schematic structural diagram of a hydraulic locking claw composite releasing mechanism and a safety fishing mechanism, and is an enlarged upper part view of fig. 11.
Fig. 2 is a cross-sectional view a-a in fig. 1.
Fig. 3 is a schematic structural diagram of a locking block type releasing mechanism and a safety fishing mechanism.
Fig. 4 is a cross-sectional view B-B in fig. 3.
Fig. 5 is a schematic structural diagram of a nut type releasing mechanism and a safety fishing mechanism, wherein the nut is an inner releasing nut.
Fig. 6 is a cross-sectional view of C-C in fig. 5.
Fig. 7 is a further exploded view of the structure shown in fig. 5.
Fig. 8 is a schematic structural diagram of a nut type releasing mechanism and a safety fishing mechanism, wherein the nut is an outer releasing nut.
Fig. 9 is a cross-sectional view of D-D in fig. 8.
Fig. 10 is a schematic structural view of a left-handed releasing mechanism and a safety fishing mechanism.
FIG. 11 is a schematic diagram of the packer construction of the present invention including a hydraulic jaw locking composite release mechanism.
Detailed Description
The terms "upper", "lower", "left" and "right" in the description and claims refer to the positional relationship as viewed from the perspective of the reader, with the top of the page being the top, the bottom of the page being the bottom, the left hand of the reader being the left, and the right hand of the reader being the right. When the relation of inside, outside or inside and outside of the pipe is described, the small radius is taken as inside or inside in the radial direction, and the large radius is taken as outside. The parts with seals in the drawings are shown in the figures and are not described in detail in the following description.
The conventional Y445 type packer is a known technology in the oil field industry, the specific structure of each packer is various, but the packer is generally provided with a deblocking pipe for lifting and deblocking the packer, and an upper oil pipe is connected with an outer barrel of the packer through a certain mechanism when the packer is lowered. The outer barrel of the packer plays a role of bearing up and down, and the outer barrel is connected with other parts of the packer down to a lower oil pipe. Such as: development of Wangshije secondary compression Y445 type packer [ J ] Petroleum machinery, 2014, 42 (11): 163-165, in the packer structure diagram in this paper, the 8-loose part glove has the same function as the packer outer cylinder 4 in this specification; in the packer construction diagram in the text, the parts 4-overshot and 9-inner centre tube together form the deblocking tube 7 in the present description. No matter how different the structure of the Y445 type packer is, in this type of packer, such parts as the unsetting pipe 7 and the packer outer cylinder 4 described in the present specification can be found, and the function of the present invention can be achieved by combining with the structure of the present invention.
FIG. 11 is a schematic view showing a construction of the Y445 type packer of the present invention, which is an improvement of the packer in the above-mentioned article on the second compression Y445 type packer. Fig. 1 is an enlarged view of the upper release mechanism and safety latch mechanism of fig. 11. Because the main body structures of the packers are the same, except for fig. 11, other drawings only show the structural schematic diagrams of the parts of the releasing mechanism and the safety fishing mechanism with different structures. The releasing mechanism and the safety fishing composite mechanism can be used on Y445 type packers shown in figure 11 and Y445 type packers with other structures. The releasing mechanism and the safe fishing composite mechanism of the invention are mainly explained below.
Referring to fig. 11, fig. 1 and fig. 2, the releasing and deblocking combined type hydraulic packer comprises a releasing mechanism, wherein the releasing mechanism is a hydraulic locking claw combined type releasing mechanism, the hydraulic locking claw combined type releasing mechanism comprises a releasing claw 1, a releasing thread 10 and a releasing piston 8, the releasing thread 10 is a left-handed thread, the releasing claw 1 is connected with an outer barrel 4 of the packer through the releasing thread 10, and the releasing piston 8 is lined at the releasing thread at the lower part of the releasing claw 1. The lower part of the lost paw 1 is provided with an axial slot, and the releasing thread part can contract inwards under the condition of no internal support when radial force is applied. The releasing piston 8 is arranged in an annular space formed by the unsealing pipe 7 and the packer outer cylinder 4, and supports the releasing thread 10 at the lower part of the releasing claw 1 from the inside, so that the releasing thread 10 cannot be released when the releasing claw 1 is subjected to axial force; when the hydraulic pressure is applied, the releasing piston 8 descends to release the releasing thread, so that when the releasing claw 1 lifts up, the releasing thread loses meshing, and the releasing claw 1 is disconnected from the outer barrel 4 of the packer. In order to prevent the releasing piston 8 from being mistakenly actuated when the tool is lowered into the well, the releasing piston 8 is generally provided with a piston shear pin 9 which is sheared when the releasing piston 8 is lowered by hydraulic pressure. In the scheme shown in fig. 1, hydraulic pressure is applied to the releasing piston 8 in such a way that a releasing ball 3 is thrown from an oil pipe to be seated on a valve seat pipe 5, and hydraulic pressure is applied to the oil pipe to push the releasing piston to move downwards. The hydraulic locking claw composite releasing mechanism has two releasing modes, and can rotate a pipe column to release in addition to the hydraulic releasing mode. The releasing thread 10 is a left-handed thread, and the releasing thread 10 can be unscrewed to lose engagement by driving the releasing claw 1 to rotate forwards through the upper pipe column of the forward rotation packer, so that the releasing claw and the outer barrel of the packer are separated. In order to prevent the releasing mechanism of the packer from being released in the process of going down the well, a releasing shear pin 2 is also arranged between the releasing claw and the outer cylinder of the packer. The releasing shear pin 2 is sheared when the pipe column is lifted or rotated forwards.
The releasing mechanism is further connected with a safe fishing mechanism, the safe fishing mechanism comprises a releasing shoulder 11 and a releasing ring 6 which are matched, and the releasing ring 6 and the releasing shoulder 11 are respectively arranged on the deblocking pipe 7 of the packer and the releasing well outlet mechanism. The ring for throwing the hand 6 can be in a circular ring shape or a partial circular ring shape, and can also be a shear pin. The releasing shoulder 11 is arranged on the periphery of the lower part of the valve seat pipe 5, and the releasing ring 6 is arranged on the inner wall of the unsealing pipe 7. The valve seat tube 5 is lifted, the releasing shoulder 11 can hang the releasing ring 6 and provide shearing force for the releasing ring 6, and when the shearing force applied to the releasing ring 6 is larger than the shearing force, the releasing ring can be sheared, which is also the meaning of the matched releasing shoulder and releasing ring. The releasing well-discharging mechanism is a part for lifting out a shaft after the packer is released, and the releasing well-discharging mechanism shown in figure 1 comprises a releasing claw 1, a releasing ball 3 and a valve seat pipe 5.
After the original Y445 type packer is set, the releasing hand raises the releasing hand well-out mechanism, and when the packer needs to be lifted out, the fishing tool is used for fishing the deblocking pipe, lifting the deblocking pipe and fishing out the packer. According to the packer, after the releasing mechanism releases the hand, the upper pipe column of the packer is lifted to drive the releasing claw 1 and the valve seat pipe 5 to move upwards, the releasing shoulder 11 moves upwards to hang the releasing ring 6 to drive the releasing pipe 7 to move upwards together, and if the packer is successfully unlocked and the releasing ring 6 is not cut off, the packer completes the whole releasing and fishing unlocking process and puts the well shaft out. If the packer meets the card deblocking and is unsuccessful, lift the power and be greater than the anti-shear force of losing the ring 6, the releasing shoulder 11 cuts the ring 6 of losing, the releasing mechanism of going out the well plays the pit shaft earlier, salvages the deblocking instrument again and accomplishes the deblocking of packer. By adopting the mechanism, the fishing process can be omitted once when the packer is pulled out under the condition that the packer unsealing function is normal.
The arrangement of the back-off shoulder 11 and back-off ring 6 is reversed, as shown in fig. 1, i.e. back-off ring 6 is disposed on seat tube 5 and back-off shoulder 11 is disposed on release tube 7.
The operation method of the releasing and deblocking combined type hydraulic packer comprising the hydraulic locking claw combined type releasing mechanism comprises the following steps:
a. throwing the throwing ball 3 from the oil pipe, and driving a hydraulic shearing piston shear pin 9 to make the releasing piston 8 go down;
b. lifting the pipe column to drive the releasing well outlet mechanism to move upwards, and hanging the releasing shoulder 11 on the releasing ring 6 to release the packer by pulling up the releasing pipe 7;
c. when the packer is stuck, the releasing ring 6 is cut off, and the releasing well outlet mechanism is lifted out of the shaft;
d. and fishing and unsealing the packer by using a lower fishing tool.
In the unsealing step, if the packer is unsealed successfully, the step b is completed for removing the packer from the shaft. And d, if the packer is blocked when being lifted and unsealed, a fishing tool needs to be lowered, and the step d needs to be carried out.
Referring to fig. 3 and 4, another preferred embodiment of the present invention is shown. The releasing mechanism is a locking block type releasing mechanism which comprises a locking block 32 and a releasing piston 8, the packer outer cylinder 4, the locking block 32, the releasing piston 8 and the valve seat pipe 5 are coaxially sleeved together, a radial hole is formed in the side wall of the locking joint 31, the locking block 32 is installed in the radial hole, and the outer side of the locking block 32 is arranged in an inner annular groove 33 of the packer outer cylinder 4. To prevent the releasing piston 8 from displacing downwards during lowering, a piston shear pin 9 is also typically provided between the locking sub 31 and the releasing piston 8. Of course, piston shear pin 9 may also be disposed between the release piston 8 and the seat tube 5.
The locking block type releasing mechanism is further connected with a safety fishing mechanism, the safety fishing mechanism comprises a releasing shoulder 11 and a releasing ring 6 which are matched, and the releasing ring 6 and the releasing shoulder 11 are respectively arranged on a deblocking pipe 7 and a releasing well outlet mechanism of the packer. The ring for throwing the hand 6 can be in a circular ring shape or a partial circular ring shape, and can also be a shear pin. The releasing shoulder 11 is arranged on the periphery of the lower part of the valve seat pipe 5, and the releasing ring 6 is arranged on the inner wall of the unsealing pipe 7. Go up poppet pipe 5, release shoulder 11 can catch and lose ring 6 and give release ring 6 a shearing force, will be cut off when the shearing force that release ring 6 received is greater than its shearing force that shears. The releasing well-out mechanism is the part for lifting out the shaft after the packer is released, and the releasing well-out mechanism shown in figure 3 comprises a locking joint 31, a releasing ball 3, a valve seat pipe 5, a releasing piston 8 and a locking block 32.
If the packer needs to be lifted out of a shaft, the throwing ball 3 is thrown into an oil pipe firstly, falls on the valve seat pipe 5, then the piston shear pin 9 is sheared through the oil pipe in a hydraulic mode, the throwing piston 8 is pushed by hydraulic pressure to move downwards to avoid the inner supporting position of the locking block 32, and at the moment, the locking joint 32 and the outer barrel 4 of the packer are axially separated and can be displaced mutually. The oil lifting pipe drives the locking joint 31 to move upwards, the locking block 32 moves radially inwards, the locking joint 31, the releasing ball 3, the valve seat pipe 5, the releasing piston 8 and the locking block 32 move upwards together, the releasing shoulder 11 moves upwards to hang the releasing ring 6 to drive the releasing pipe 7 to move upwards, and if the packer is successfully released and the releasing ring 6 is not cut, the packer completes the whole releasing, salvaging and releasing processes and lifts the shaft. If the packer meets the card deblocking and is unsuccessful, lift the power and be greater than the anti-shear force of losing the ring 6, the releasing shoulder 11 cuts the ring 6 of losing, the releasing mechanism of going out the well plays the pit shaft earlier, salvages the deblocking instrument again and accomplishes the deblocking of packer. By adopting the mechanism, the fishing process can be omitted once when the packer is pulled out under the condition that the packer unsealing function is normal.
The arrangement of the back-off shoulder 11 and back-off ring 6 is reversed, as shown in fig. 3, i.e. back-off ring 6 is disposed on seat tube 5 and back-off shoulder 11 is disposed on release tube 7.
The packer shown in fig. 3 is identical to the steps described in the operation method of the releasing and unblocking compound hydraulic packer including the hydraulic locking jaw compound releasing mechanism.
Referring to fig. 5 and 6, this is yet another preferred embodiment of the present invention. The releasing mechanism is a nut type releasing mechanism, and left-handed releasing threads 10 are arranged on the releasing nut. The nut type releasing mechanism comprises an inner releasing nut 53, a releasing thread 10 and a bearing ring 52; the inner hole of the inner releasing nut 53 is provided with a releasing thread 10, and the inner releasing nut 53 is connected with the screw joint 51 through the releasing thread 10; the outer wall of the inner releasing nut is provided with a key groove, and correspondingly, the inner wall of the outer packer barrel 4 is provided with an inner key protrusion 54 matched with the key groove; the outer circumference of the bearing ring 52 is arranged in an inner groove of the outer packer barrel 4, and the inner wall of the bearing ring is arranged in an outer ring groove formed by the screw joint 51 and the inner releasing nut 53.
The nut type releasing mechanism is further connected with a safety fishing mechanism, the safety fishing mechanism comprises a releasing shoulder 11 and a releasing ring 6 which are matched, and the releasing ring 6 and the releasing shoulder 11 are respectively arranged on a deblocking pipe 7 and a releasing well outlet mechanism of the packer. The ring for throwing the hand 6 can be in a circular ring shape or a partial circular ring shape, and can also be a shear pin. Release shoulder 11 is disposed on the inner wall of screw connector 51 and release ring 6 is disposed on the outer wall of release tube 7. Lifting the screw joint 51, the releasing shoulder 11 can hang the releasing ring 6 and give a shearing force to the releasing ring 6, and when the shearing force applied to the releasing ring 6 is larger than the shearing force, the releasing ring can be sheared. The releasing well outlet mechanism is the part for lifting out the shaft after the packer is released, and the releasing well outlet mechanism shown in figure 5 only has a spiral joint 51.
In order to prevent accidental release of the release mechanism, a release shear pin 2 is also typically provided between the nipple 51 and the packer outer barrel 4.
If the packer needs to be lifted out of the shaft, the lifting load of the downhole tubular column is adjusted firstly, so that the packer is positioned at the neutral point of the tubular column or a certain weight of the oil tubular column, generally 10-30 kN, is loaded on the packer, and the weight of the oil tubular column presses on the bearing ring 52. The forward rotation oil pipe column drives the spiral joint 51 to rotate, and because a matching structure of a key groove and an inner key protrusion 54 is arranged between the inner releasing nut 53 and the packer outer cylinder 4, when the spiral joint 51 rotates positively, the inner releasing nut 53 cannot rotate but can move downwards under the pushing of the left-handed releasing thread 10, and finally the inner releasing nut 53 is disconnected from the spiral joint 51. And lifting the spiral connector 51 to enable the releasing shoulder 11 to go up to hang the releasing ring 6 to drive the releasing pipe 7 to go up together, and if the packer is released smoothly, the releasing ring 6 is not cut off, the packer finishes the whole releasing and fishing process and provides a shaft. If the packer meets the card deblocking and is unsuccessful, the lifting force is greater than the shearing resistance of the lost ring 6, the lost ring 6 is cut off by the releasing shoulder 11, the spiral connector 51 firstly exits the shaft, and then the packer is unsealed by fishing and deblocking tools. By adopting the mechanism, the fishing process can be omitted once when the packer is pulled out under the condition that the packer unsealing function is normal.
The arrangement of releasing shoulder 11 and releasing ring 6 is reversed and the arrangement shown in figure 5 can be reversed, i.e. releasing ring 6 is arranged on screw joint 51 and releasing shoulder 11 is arranged on release tube 7.
Referring to fig. 5 and 7, fig. 7 is a further exploded view of the structure shown in fig. 5. Unsealing pipe 7 in fig. 5 is disassembled in fig. 7 for installing hand-losing ring 6, and unsealing pipe 7 is disassembled into 2 parts: an upper deblocking pipe 73 and a lower deblocking pipe 74. Likewise, to install the bearing ring 52, the packer outer cylinder 4 in fig. 5 is broken down in fig. 7 into an upper seal outer cylinder 71 and a lower seal outer cylinder 72. In addition to the component disassembly example shown in fig. 7, for simplicity and clarity of illustration, the structure in the drawings of the present specification is not disassembled according to the factors such as machining and assembly to be considered in the design of the mechanism components, and the components should be disassembled as required in the actual design.
Referring to fig. 8 and 9, this is yet another preferred embodiment of the present invention. The releasing mechanism is a nut type releasing mechanism, and the nut type releasing mechanism comprises an outer releasing nut 82, a releasing thread 10 and a bearing ring 52; the outer wall of the outer releasing nut 82 is provided with a releasing thread 10, and the outer releasing nut 82 is connected with the outer packer barrel 4 through the releasing thread 10; the inner wall of the outer releasing nut 82 is provided with a key slot, and correspondingly, the outer wall of the key slot joint 81 is provided with an outer key protrusion 83 matched with the key slot; the outer circumference of the bearing ring 52 is arranged in an inner groove of the outer packer barrel 4, and the inner wall of the bearing ring is arranged in an outer ring groove formed by the keyway connector 81 and the outer releasing nut 82.
The nut type releasing mechanism is further connected with a safety fishing mechanism, the safety fishing mechanism comprises a releasing shoulder 11 and a releasing ring 6 which are matched, and the releasing ring 6 and the releasing shoulder 11 are respectively arranged on a deblocking pipe 7 and a releasing well outlet mechanism of the packer. The ring for throwing the hand 6 can be in a circular ring shape or a partial circular ring shape, and can also be a shear pin. Release shoulder 11 is arranged on the inner wall of keyway joint 81, and release ring 6 is arranged on the outer wall of deblocking pipe 7. Lifting the keyway connector 81, the releasing shoulder 11 can hang the releasing ring 6 and give the releasing ring 6 a shearing force, and when the shearing force borne by the releasing ring 6 is larger than the shearing force, the releasing ring can be sheared. The releasing well outlet mechanism is the part for lifting out the well shaft after the packer is released, and the releasing well outlet mechanism shown in figure 8 only has a keyway connector 81.
In order to prevent accidental release of the release mechanism, a release shear pin 2 is also typically provided between the keyway connector 81 and the packer outer barrel 4.
If the packer needs to be lifted out of the shaft, the lifting load of the downhole tubular column is adjusted firstly, so that the packer is positioned at the neutral point of the tubular column or a certain weight of the oil tubular column, generally 10-30 kN, is loaded on the packer, and the weight of the oil tubular column presses on the bearing ring 52. The forward rotation oil pipe column drives the keyway connector 81 to rotate, and because a matching structure of a keyway and an outer key protrusion 83 is arranged between the outer releasing nut 82 and the keyway connector 81, when the keyway connector 81 rotates positively, the outer releasing nut 82 cannot rotate but can move downwards under the pushing of the left-handed releasing thread 10, and finally the outer releasing nut 82 is disconnected from the keyway connector 81. Lift keyway joint 81, make the circular bead of giving up 11 go up and hang and lose 6 rings of hands and drive and go up together of deblocking pipe 7, if the packer deblocking is smooth, give up 6 rings of hands and not cut, then the packer has just accomplished the whole processes of giving up and salvage the deblocking, proposes the pit shaft. If the packer meets the card deblocking and is unsuccessful, lift the power and be greater than the anti-shear force of losing the ring 6, the circular bead of giving up 11 cuts the ring 6 of losing, keyway joint 81 plays the pit shaft earlier, salvages the deblocking instrument again and accomplishes the deblocking of packer. By adopting the mechanism, the fishing process can be omitted once when the packer is pulled out under the condition that the packer unsealing function is normal.
The arrangement of releasing shoulder 11 and releasing ring 6 is reversed and the arrangement shown in figure 8 is reversed, i.e. releasing ring 6 is located on keyway connector 81 and releasing shoulder 11 is located on release tube 7.
Referring to fig. 10, this is yet another preferred embodiment of the present invention. The releasing mechanism is a left-handed releasing mechanism which comprises a releasing thread 10, and the releasing joint 101 is connected with the outer barrel 4 of the packer through the left-handed releasing thread 10.
The left-handed releasing mechanism is further connected with a safe fishing mechanism, the safe fishing mechanism comprises a releasing shoulder 11 and a releasing ring 6 which are matched, and the releasing shoulder 11 and the releasing ring 6 are respectively arranged on a deblocking pipe 7 and a releasing well outlet mechanism of the packer. The ring for throwing the hand 6 can be in a circular ring shape or a partial circular ring shape, and can also be a shear pin. The ring of losing 6 sets up the inner wall at joint 101 of giving up, and the shoulder of giving up 11 sets up at deblocking pipe 7 outer wall. Lifting the releasing sub 101, the releasing ring 6 will catch the releasing shoulder 11 and give a shearing force to the releasing ring 6, and when the shearing force applied to the releasing ring 6 is larger than the shearing force, the releasing ring will be sheared. The releasing well outlet mechanism is the part for lifting out the shaft after the packer is released, and the releasing well outlet mechanism shown in figure 8 only has a releasing joint 101.
In order to prevent accidental release of the release mechanism, a release shear pin 2 is also typically provided between the release sub 101 and the packer outer barrel 4.
If the packer needs to be lifted out of the shaft, the lifting load of the underground pipe string is adjusted, so that the packer is positioned at the neutral point of the pipe string. The forward rotation oil pipe column drives the releasing joint 101 to rotate, the releasing thread 10 is a left-handed thread, the packer outer cylinder 4 does not rotate, and finally the releasing joint 101 is disconnected with the packer outer cylinder 4. And lifting the releasing joint 101 to enable the releasing ring 6 to go upwards to hang the releasing shoulder 11 to drive the releasing pipe 7 to go upwards together, and if the packer is successfully released and the releasing ring 6 is not sheared, completing the whole releasing, salvaging and releasing process of the releasing ring by the packer and lifting the shaft. If the packer meets the card deblocking and is unsuccessful, the lifting force is greater than the shearing resistance of the lost ring 6, the lost ring 6 is cut off by the releasing shoulder 11, the releasing joint 101 firstly breaks out of the shaft, and then the packer is unsealed by fishing the deblocking tool. By adopting the mechanism, the fishing process can be omitted once when the packer is pulled out under the condition that the packer unsealing function is normal.
The arrangement of releasing shoulder 11 and releasing ring 6 is reversed and the arrangement shown in fig. 10 can be reversed, i.e. releasing ring 6 is placed on deblocking pipe 7 and releasing shoulder 11 is placed on releasing sub 101.
In summary, the operation method applied to the releasing combined type hydraulic packer comprising the nut type releasing mechanism and the left-handed releasing mechanism comprises the following steps:
a. the oil pipe rotates forwards to unscrew the releasing thread, and the releasing and discharging mechanism is disconnected with the outer barrel of the packer;
b. lifting the pipe column to drive the releasing well outlet mechanism to move upwards, and hanging the releasing shoulder 11 on the releasing ring 6 to release the packer by pulling up the releasing pipe 7;
c. when the packer is stuck, the releasing ring 6 is cut off, and the releasing well outlet mechanism is lifted out of the shaft;
d. and fishing and unsealing the packer by using a lower fishing tool.
In the unsealing step, if the packer is unsealed successfully, the step b is completed for removing the packer from the shaft. And d, if the packer is blocked when being lifted and unsealed, a fishing tool needs to be lowered, and the step d needs to be carried out.
It will be apparent that those skilled in the art can make many modifications and variations based on the spirit of the present invention.
Claims (10)
1. The releasing and deblocking combined type hydraulic packer comprises a releasing mechanism and is characterized in that the releasing mechanism is further connected with a safe fishing mechanism which comprises a releasing shoulder (11) and a releasing ring (6) which are matched with each other, wherein the releasing shoulder (11) and the releasing ring (6) are respectively arranged on a releasing pipe (7) and a releasing well outlet mechanism of the packer.
2. The releasing and deblocking combined type hydraulic packer as claimed in claim 1, wherein the releasing mechanism is a hydraulic locking claw combined type releasing mechanism, the hydraulic locking claw combined type releasing mechanism comprises a releasing claw (1), releasing threads (10) and a releasing piston (8), the releasing threads (10) are left-handed threads, the releasing claw (1) is connected with the outer barrel (4) of the packer through the releasing threads (10), and the releasing piston (8) is lined at the lower releasing threads of the releasing claw (1).
3. The releasing composite hydraulic packer as claimed in claim 1, wherein the releasing mechanism is a block-type releasing mechanism, the block-type releasing mechanism comprises a block (32) and a releasing piston (8), the packer outer cylinder (4), the block (32), the releasing piston (8) and the valve seat pipe (5) are coaxially sleeved together, wherein the side wall of the locking joint (31) is radially provided with a hole, the block (32) is arranged in the radial hole, and the outer side of the block (32) is arranged in an inner annular groove of the packer outer cylinder (4).
4. The releasing composite hydraulic packer of claim 1, wherein the releasing mechanism is a nut-type releasing mechanism, and a left-handed releasing thread is provided on the releasing nut.
5. The releasing composite hydraulic packer as claimed in claim 4, wherein the nut-type releasing mechanism comprises an inner releasing nut (53), a releasing thread (10) and a bearing ring (52); the inner hole of the inner releasing nut (53) is provided with releasing threads, and the inner releasing nut is connected with the screw joint (51) through the releasing threads; the outer wall of the inner releasing nut is provided with a key groove, and correspondingly, the inner wall of the outer packer barrel (4) is provided with an inner key protrusion (54) matched with the key groove; the periphery of the bearing ring (52) is arranged in an inner groove of the outer packer cylinder (4), and the inner wall of the bearing ring is arranged in an outer ring groove formed by the spiral joint (51) and the inner releasing nut (53).
6. The releasing composite hydraulic packer as recited in claim 4, characterized in that the nut-type releasing mechanism includes an outer releasing nut (82), a releasing thread (10) and a bearing ring (52); the outer wall of the outer releasing nut (82) is provided with releasing threads, and the outer releasing nut is connected with the outer barrel (4) of the packer through the releasing threads; the inner wall of the outer releasing nut is provided with a key groove, and correspondingly, the outer wall of the key groove joint (81) is provided with an outer key protrusion (83) matched with the key groove; the periphery of the bearing ring (52) is arranged in an inner groove of the outer packer barrel (4), and the inner wall of the bearing ring is arranged in an outer ring groove formed by the keyway joint (81) and the outer releasing nut (82).
7. The releasing composite hydraulic packer as claimed in claim 1, wherein the releasing mechanism is a left-handed releasing mechanism, the left-handed releasing mechanism comprises a releasing thread (10), and the releasing joint (101) is connected with the outer barrel (4) of the packer through the left-handed releasing thread (10).
8. The releasing composite hydraulic packer of claim 1, wherein the releasing ring (6) is circular, partially circular or shear pin.
9. The operation method applied to the releasing and deblocking composite hydraulic packer of claim 2 or 3, comprises the following steps of:
a. throwing a throwing ball (3) from the oil pipe, and driving a hydraulic shearing piston shear pin (9) to enable a throwing piston (8) to descend;
b. lifting the pipe column to drive the releasing well outlet mechanism to move upwards, and hanging a releasing shoulder (11) on a releasing ring (6) to pull up a releasing pipe (7) to release the packer;
c. when the packer is blocked, the releasing ring (6) is cut off, and the releasing well outlet mechanism is lifted out of the shaft;
d. and fishing and unsealing the packer by using a lower fishing tool.
10. The releasing and deblocking combined hydraulic packer applied to any one of claims 4 to 7, comprising the following steps of:
a. the oil pipe rotates forwards to unscrew the releasing thread, and the releasing and discharging mechanism is disconnected with the outer barrel of the packer;
b. lifting the pipe column to drive the releasing well outlet mechanism to move upwards, and hanging a releasing shoulder (11) on a releasing ring (6) to pull up a releasing pipe (7) to release the packer;
c. when the packer is blocked, the releasing ring (6) is cut off, and the releasing well outlet mechanism is lifted out of the shaft;
d. and fishing and unsealing the packer by using a lower fishing tool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010959295.0A CN114183081A (en) | 2020-09-14 | 2020-09-14 | Releasing and deblocking combined hydraulic packer and operation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010959295.0A CN114183081A (en) | 2020-09-14 | 2020-09-14 | Releasing and deblocking combined hydraulic packer and operation method thereof |
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| CN114183081A true CN114183081A (en) | 2022-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010959295.0A Pending CN114183081A (en) | 2020-09-14 | 2020-09-14 | Releasing and deblocking combined hydraulic packer and operation method thereof |
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