CN107780862B - Fishing device for underground throttler - Google Patents
Fishing device for underground throttler Download PDFInfo
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- CN107780862B CN107780862B CN201710867633.6A CN201710867633A CN107780862B CN 107780862 B CN107780862 B CN 107780862B CN 201710867633 A CN201710867633 A CN 201710867633A CN 107780862 B CN107780862 B CN 107780862B
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- 210000000078 claw Anatomy 0.000 claims abstract description 30
- 238000010008 shearing Methods 0.000 claims abstract description 19
- 238000007789 sealing Methods 0.000 claims description 17
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 4
- 235000017491 Bambusa tulda Nutrition 0.000 claims 4
- 241001330002 Bambuseae Species 0.000 claims 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 4
- 239000011425 bamboo Substances 0.000 claims 4
- 238000009434 installation Methods 0.000 claims 1
- 230000009471 action Effects 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 17
- 230000008569 process Effects 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Marine Sciences & Fisheries (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to the technical field of underground salvaging devices, in particular to an underground throttle salvaging device which comprises an upper joint, a body, a claw assembly, a push rod and a piston, wherein the lower end of the upper joint is fixedly connected with the upper end of the body, the lower end of the body is fixedly connected with the claw assembly, the piston is arranged in an upper cylinder, and the push rod is arranged in the body. The invention has reasonable and compact structure, applies downward thrust to the piston and the push rod by utilizing hydraulic pressure through ingenious design of the internal structure of the jaw assembly, so that the first shearing pin is broken, the jaw assembly can further realize the action of grabbing the throttle, the throttle can be firmly grabbed, the success rate of salvage is improved, and the salvage cost is saved; if the blocking occurs, the invention only needs to be continuously lifted to break the second shearing pin, and the claw assembly is separated from the throttle at the moment, so that the practicality and the safety of the invention are improved because the danger can be flexibly removed when the blocking occurs.
Description
Technical Field
The invention relates to the technical field of underground salvaging devices, in particular to an underground throttle salvaging device.
Background
At present, the downhole throttling technology is one of key technologies for low-pressure and low-yield gas field development, and the throttler is a key device for achieving the downhole throttling technology, but due to reasons of downhole sand production, scaling, corrosion and the like, the problems of high difficulty and low success rate of fishing the downhole throttler by using steel wires exist in part of gas wells, if even fishing of the downhole throttler cannot be achieved, the fact that measures such as bubble drainage, a speed tubular column, plunger gas lift and the like cannot be implemented in part of low-pressure water and gas producing wells, the gas well yield is low or the well is stopped, and finally, the throttler is taken out, measures such as a well-killing tubing string or a tubing string with pressure are needed, the measures are expensive, and drilling clamping and high well control safety risks exist.
Disclosure of Invention
The invention provides a fishing device for an underground throttle, which overcomes the defects of the prior art and can effectively solve the problems of low success rate and high fishing cost of the traditional method for fishing the throttle.
The technical scheme of the invention is realized by the following measures: the fishing device for the downhole throttle comprises an upper joint, a body, a claw assembly, a push rod and a piston, wherein the upper joint and the body are cylindrical, a threaded section is arranged on the inner wall of an upper port of the upper joint, the lower end of the upper joint is fixedly connected with the upper end of the body, the piston is arranged in the upper joint, an outer convex upper limit boss is arranged on the upper end face of the piston, an upper shoulder corresponding to the upper limit boss is arranged on the inner wall of the upper joint below the upper limit boss, a first sliding gap is arranged between the lower end face of the upper limit boss and the upper end face of the upper shoulder, the push rod is arranged in the body, an outer convex lower limit boss is arranged on the upper end face of the push rod, a lower shoulder corresponding to the lower limit boss is arranged on the inner wall of the body below the lower limit boss, a second sliding gap is arranged between the lower end face of the lower limit boss and the upper end face of the lower shoulder, the outer side of the push rod downward along the lower end face of the lower limit boss is provided with a limit groove corresponding to the lower shoulder, the horizontal circumferential direction along the outer side face of the body is provided with a mounting ring groove corresponding to the position of the lower shoulder, at least two first through holes penetrating through the lower shoulder are arranged in the mounting ring groove, an annular tension spring is sleeved in the mounting ring groove, the first through holes are internally provided with lock pins which are limited in the first through holes by the tension spring and continuously push the outer side face of the push rod, the lower shoulder is also internally provided with at least two second through holes distributed along the horizontal circumferential direction, the second through holes are internally provided with first shearing pins for fixing the push rod, the lower end of the push rod downwards extends into the claw assembly, the outer wall of the lower end of the push rod is fixedly connected with a baffle ring for preventing the claw assembly from falling, the claw assembly is fixedly connected with the body through a second shearing pin arranged on the body, the lower extreme inside of body is provided with the first spring of suit on the push rod, and first spring is compressed form, and the one end roof pressure of first spring is on the lower terminal surface of lower shoulder, and the other end roof pressure of first spring is on the up end of jack catch subassembly, is provided with the second spring of suit on the jack catch subassembly in the outside of jack catch subassembly.
The following are further optimizations and/or improvements to the above-described inventive solution:
the claw assembly comprises a sleeve, claw seats, mounting barrels and claws, wherein the upper ends of the sleeves are inserted into the body and fixedly connected with the body through second shearing pins arranged on the body, the lower ends of the sleeves are fixedly connected with the upper ends of the claw seats, at least two claw notches are uniformly distributed in the circumferential direction of the claw seats, the claws are arranged in the claw notches, clamping teeth are integrally fixed on the inner walls of the lower ends of the claws, a section of axial sliding block notch is arranged on the barrel wall of each claw notch above the sleeve, the mounting barrels are sleeved on the outer sides of the sleeves, clamping holes corresponding to the sliding block notch are distributed on the mounting barrels at intervals along the circumference, sliding block pins are arranged in the sliding block notch, the inner sides of the sliding block pins are propped against the outer walls of the push rods, mounting gaps are formed between the inner walls of the sleeves and the outer walls of the push rods, retaining rings fixedly connected with the outer walls of the push rods, the upper ends of the first springs are propped against the lower end faces of the lower shoulders, the lower ends of the first springs are propped against the upper end faces of the sleeves, the outer sides of the second sleeves are sleeved on the upper end faces of the upper ends of the springs, and the lower ends of the second springs are propped against the upper end faces of the upper ends of the springs.
At least one first sealing ring is arranged between the outer side of the upper limit boss and the inner wall of the upper joint, at least one second sealing ring is arranged between the outer side of the upper shoulder and the inner wall of the body, and at least one third sealing ring is arranged between the outer side of the lower limit boss and the inner wall of the body.
The upper limit boss and the upper shoulder are in a ring shape, or/and the lower limit boss and the lower shoulder are in a ring shape.
The upper joint is in threaded connection with the body.
The invention has reasonable and compact structure, applies downward thrust to the piston and the push rod by utilizing hydraulic pressure through ingenious design of the internal structure of the jaw assembly, so that the first shearing pin is broken, the jaw assembly can realize the action of grabbing the throttle, the structure is simple, the performance is stable, the throttle can be firmly grabbed, the success rate of salvage is high, and the salvage cost is saved because the salvage process is simplified; if the blocking occurs, the invention is required to be separated from the salvaged object, the invention is only required to be continuously lifted up to break the second shearing pin, and the claw assembly is separated from the throttle at the moment, so that the practicability and the safety of the invention are improved because the claw assembly can be flexibly released when the blocking occurs.
Drawings
Fig. 1 is a schematic view of a semi-sectional structure in front view of a preferred embodiment of the present invention.
The codes in the drawings are respectively: 1 is an upper joint, 2 is a body, 3 is a push rod, 4 is a piston, 5 is an upper limit boss, 6 is an upper shoulder, 7 is a first sliding gap, 8 is a lower limit boss, 9 is a lower shoulder, 10 is a second sliding gap, 11 is a limit groove, 12 is a mounting ring groove, 13 is a first through hole, 14 is a tension spring, 15 is a lock pin, 16 is a second through hole, 17 is a first shearing pin, 18 is a first spring, 19 is a second spring, 20 is a sleeve, 21 is a claw seat, 22 is a second shearing pin, 23 is a claw notch, 24 is a claw, 25 is a latch, 26 is a slider notch, 27 is a slider pin, 28 is a mounting gap, 29 is a baffle ring, 30 is a first sealing ring, 31 is a second sealing ring, and 32 is a third sealing ring.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present invention.
In the present invention, for convenience of description, the description of the relative positional relationship of each component is described according to the layout manner of fig. 1 of the specification, for example: the positional relationship of up, down, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.
The invention is further described below with reference to examples and figures:
as shown in fig. 1, the fishing device for the downhole choke comprises an upper joint 1, a body 2, a claw assembly, a push rod 3 and a piston 4, wherein the upper joint 1 and the body 2 are cylindrical, a threaded section is arranged on the inner wall of an upper port of the upper joint 1, the lower end of the upper joint 1 is fixedly connected with the upper end of the body 2, the piston 4 is arranged in the upper joint 1, an outer convex upper limit boss 5 is arranged on the upper end face of the piston 4, an upper shoulder 6 corresponding to the upper limit boss 5 is arranged on the inner wall of the upper joint 1 below the upper limit boss 5, a first sliding gap 7 is arranged between the lower end face of the upper limit boss 5 and the upper end face of the upper shoulder 6, the push rod 3 is arranged in the body 2, an outer convex lower limit boss 8 is arranged on the upper end face of the push rod 3, a lower shoulder 9 corresponding to the lower limit boss 8 is arranged on the inner wall of the body 2 below the lower limit boss 8, a second sliding gap 10 is arranged between the lower end face of the lower limit boss 8 and the upper end face of the lower shoulder 9, a limit groove 11 corresponding to the lower shoulder 9 is arranged on the outer side of the push rod 3 downward along the lower end face of the lower limit boss 8, a mounting annular groove 12 corresponding to the lower shoulder 9 is arranged on the outer side face of the body 2 in the horizontal circumferential direction, at least two first through holes 13 penetrating through the lower shoulder 9 are arranged in the mounting annular groove 12, an annular tension spring 14 is sleeved in the mounting annular groove 12, lock pins 15 which are limited in the first through holes 13 by the tension spring 14 and continuously push against the outer side face of the push rod 3 are arranged in the first through holes 13, at least two second through holes 16 distributed along the horizontal circumferential direction are also arranged on the lower shoulder 9, first shear pins 17 for fixing the push rod 3 are arranged in the second through holes 16, and the lower end of the push rod 3 extends downwards into the jaw assembly, the baffle ring 29 that prevents that the jack catch subassembly from dropping is fixedly connected with on the lower extreme outer wall of push rod 3, the jack catch subassembly is through setting up the second shear pin 22 on body 2 and body 2 fixed connection, be provided with the first spring 18 of suit on push rod 3 in the lower extreme inside of body 2, first spring 18 is compressed form, the one end roof pressure of first spring 18 is on the lower terminal surface of lower shoulder 9, the other end roof pressure of first spring 18 is on the up end of jack catch subassembly, be provided with the second spring 19 of suit on the jack catch subassembly in the outside of jack catch subassembly.
When the throttle in the well is required to be fished out, the tool string connected with the hydraulic pressure type hydraulic jack catch is only required to be lowered into the well, the tool string can be used for firmly grabbing the salvaging neck of the throttle by utilizing the gravity of the tool string, then the hydraulic jack catch is required to be separated from the throttle in time by injecting liquid into the hydraulic jack catch through the tool string, the internal pressure of the hydraulic jack catch is improved, the first shearing pin 17 breaks under the action of the hydraulic jack catch is acted on the piston 4, the push rod 3 is forced to move downwards together by the downward movement of the piston 4, the cone on the throttle and the slip teeth are relatively displaced by the thrust of the push rod 3, so that the throttle is unlocked, the throttle can be fished out smoothly by continuously lifting the tool string, if the hydraulic jack catch is blocked after the throttle is grabbed for a certain reason, the hydraulic jack catch is required to be separated from the throttle in time, and the hydraulic jack catch is successfully recovered by continuously lifting the hydraulic jack catch. The invention has simple structure and stable performance, can firmly grasp the throttler, has high success rate of salvage, and the whole process of grasping or releasing the throttler is completed by a mechanism in the throttler, thereby simplifying the salvage process, saving salvage cost, saving time and labor, ensuring normal construction progress and being suitable for large-scale popularization.
The underground throttle fishing device can be further optimized or/and improved according to actual needs:
as shown in fig. 1, the jaw assembly comprises a sleeve 20, a jaw seat 21, a mounting cylinder and jaws 24, wherein the upper end of the sleeve 20 is inserted in the body 2 and fixedly connected with the body 2 through a second shear pin 22 arranged on the body 2, the lower end of the sleeve 20 is fixedly connected with the upper end of the jaw seat 21, at least two jaw notches 23 are uniformly distributed along the circumferential direction of the jaw seat 21, the jaws 24 are arranged in the jaw notches 23, clamping teeth 25 are integrally fixed on the inner wall of the lower end of the jaws 24, a section of axial slider notch 26 is arranged on the wall of the sleeve 20 above each jaw notch 23, the mounting cylinder is sleeved on the outer side of the sleeve 20, clamping holes corresponding to the slider notches 26 are circumferentially distributed on the mounting cylinder at intervals, slider pins 27 are arranged in the slider notches 26, the inner sides of the slider pins 27 are pressed on the outer wall of the push rod 3, a mounting gap 28 is formed between the inner wall of the sleeve 20 below the slider pins 27 and the outer wall of the push rod 3, a retaining ring 29 is arranged in the mounting gap 28 and fixedly connected with the outer wall of the push rod 3, the upper end of the first spring 18 is pressed against the second end face of the upper end face of the sleeve 19, and the second end face of the spring 19 is pressed against the upper end face of the second end face of the sleeve 19, and the upper end face of the second end face of the spring 19 is pressed against the upper end face of the upper end of the sleeve 19.
The jaw assembly of the present invention has two functions, one to grasp the restrictor and the other to disengage the restrictor. The claw assembly grabs the specific working process of the throttle: in the process of lowering the invention, the upper end surface of the throttle gradually enters the bottom of the jaw seat 21, the inner side of the jaw notch 23 on the jaw assembly is communicated with the inside of the jaw seat 21, the lower part of the jaw 24 installed in the jaw notch 23 is pressed by the throttle, the jaw 24 moves upwards along the slide block notch 26 through the slide block pin 27, the second spring 19 is compressed, the clamping tooth 25 arranged on the inner side of the lower end of the jaw 24 is separated from the jaw notch 23 due to the upward movement of the jaw 24 and the extrusion deformation of the throttle to the jaw 24, meanwhile, the outer edge of the throttle fishing neck, which can be hooked by the clamping tooth 25, completely enters the jaw seat 21, gradually returns to deform along with the gradual recovery of the second spring 19, the jaw 24 and the clamping tooth 25 are forced to be reset into the jaw notch 23, and the clamping tooth 25 is firmly hooked on the fishing neck at the moment.
The specific working process of the jaw assembly separating from the throttle is as follows: if the choke is blocked in the well and cannot be lifted for some reason, the salvaging plan is needed to be canceled, the choke needs to be separated from the choke, at the moment, the invention needs to be lifted up continuously, when the lifted-up pulling force reaches the design value of the second shearing pin 22, the second shearing pin 22 breaks, the first spring 18 which is originally in a compressed state instantly releases the elastic force, the pressure of the first spring 18 can force the sliding sleeve to move downwards, at the moment, a section of axial relative gap exists between the clamping tooth 25 and the clamping jaw notch 23, at the moment, the clamping jaw seat 21 can not limit the clamping tooth 25 in the clamping jaw notch 23 any more, the clamping jaw 24 can not keep the state of tightening and clamping the choke, the choke can be lifted up slightly, the clamping jaw 24 and the clamping tooth 25 can be separated from the clamping jaw notch 23 any more, the continuous lifting tool string can be recovered successfully at the well mouth, and the choke retained in the well can be fished out by other methods.
Since the whole jaw assembly is completely separated from the push rod 3 and the body 2 after the first shearing pin 17 and the second shearing pin 22 are broken, if not limited, the whole jaw assembly and the throttle are retained in the well together, the arrangement of the baffle ring 29 prevents the situation, the position of the baffle ring 29 is the descending limit of the sliding block after the second shearing pin 22 is broken, and the baffle ring 29 fixed on the push rod 3 can prevent the jaw assembly and the throttle from being retained in the well together by limiting the sliding block pin 27. The smart design of the internal structure of the claw assembly not only ensures the success rate of the claw assembly to grasp the throttle, but also can be flexibly released when encountering the blockage, thereby improving the practicability and the safety of the invention.
As shown in fig. 1, at least one first sealing ring 30 is arranged between the outer side of the upper limit boss 5 and the inner wall of the upper joint 1, at least one second sealing ring 31 is arranged between the outer side of the upper shoulder 6 and the inner wall of the body 2, and at least one third sealing ring 32 is arranged between the outer side of the lower limit boss 8 and the inner wall of the body 2. The arrangement of the first sealing ring 30, the second sealing ring 31 and the third sealing ring 32 can increase the sealing strength of the invention, ensure the tightness of the invention when the pressure is held back, and enable the invention to smoothly shear the first shear pin 17.
As shown in fig. 1, the upper limit boss 5 and the upper shoulder 6 are annular, or/and the lower limit boss 8 and the lower shoulder 9 are annular. Therefore, the stress on the contact parts of the upper limit boss 5 and the upper shoulder 6 and the lower limit boss 8 and the lower shoulder 9 is uniform, the service life of the device is prolonged, the sealing between the end faces is also facilitated by the outer circular shape, and the smooth realization of the pressure holding process is indirectly ensured.
As shown in fig. 1, the upper joint 1 and the body 2 are in threaded connection. Thus, the disassembly is convenient, and the later maintenance process is convenient.
The technical characteristics form the optimal embodiment of the invention, have stronger adaptability and optimal implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.
The use process of the best embodiment of the invention comprises the following steps:
step 1) preparation before salvaging:
before site construction, the size of the invention should be selected to be consistent with the size of the gas well choke which is salvaged, and the size of the invention is usually consistent with the size of a tool string which consists of other tools, and the tool string is usually put into a well, so that when the tool string is put into operation, a filling valve on the well is firstly opened to fill the continuous oil pipe, and when the liquid flows out from a filling hole of the filling valve, the continuous oil pipe is filled with the liquid, and the filling valve is closed.
Step 2) throwing in a fishing tool and grabbing a throttle:
the tool string connected with the invention is lowered into the well, after the invention reaches the upper part of the throttle, the tool string is quickly lowered, then the tool string is slowly lifted, and if the lifting force at the moment is larger than the hanging weight of the tool string, the invention is proved to have caught the fishing neck of the throttle.
The specific working process in the process of the invention comprises the following steps: in the process of lowering the invention, the upper end surface of the throttle gradually enters the bottom of the jaw seat 21, the inner side of the jaw notch 23 on the jaw assembly is communicated with the inside of the jaw seat 21, the lower part of the jaw installed in the jaw notch 23 is pressed by the throttle, the jaw 24 moves upwards along the slide notch 26 through the slide block pin 27, the second spring 19 is compressed, the clamping tooth 25 arranged on the inner side of the lower end of the jaw 24 is separated from the jaw notch 23 due to the upward movement of the jaw 24 and the extrusion deformation of the throttle to the jaw 24, meanwhile, the outer edge of the throttle fishing neck, which can be hooked by the clamping tooth 25, completely enters the jaw seat 21, gradually returns to deform along with the gradual recovery of the second spring 19, the jaw 24 and the clamping tooth 25 are forced to be restored into the jaw notch 23, and the clamping tooth 25 is firmly hooked on the fishing neck at the moment.
Step 3) unlocking the throttle:
when the invention is confirmed to grasp the throttle, hydraulic pressure is continuously applied to the tool string, so that the pressure at the piston 4 in the invention is gradually increased until the first shear pin 17 is broken, the piston 4 pushes the push rod 3 to move downwards together, the descending distance of the piston 4 is the length of the first sliding gap 7, the descending distance of the push rod 3 is the length of the second sliding gap 10, when the piston 4 moves downwards to the upper shoulder 6, the upper limit boss 5 on the piston 4 is limited by the upper shoulder 6, the lower limit boss 8 on the push rod 3 is limited by the lower shoulder 9, the thrust of the push rod 3 forces the cone on the throttle and the slip teeth to generate relative displacement in the process of moving downwards the push rod 3, so that the throttle is unlocked, and in the process, the lock pin 15 is pressed against the bottom of the limit groove 11 under the action of the tension spring 14 and clamps the push rod 3, so that the push rod 3 is kept at the lowest point, and the throttle is always kept in an unlocked state.
Step 4) lifting and fishing a throttle device:
after unlocking the choke, the tool string can be lifted, the choke is fished out of the well, if the choke is blocked in the well and cannot be lifted up due to a certain reason, the salvaging plan is needed to be canceled, the invention is needed to be separated from the choke, at the moment, the invention is only needed to be lifted up continuously, when the lifted-up pulling force reaches the design value of the second shearing pin 22, the second shearing pin 22 breaks, the first spring 18 in the original compressed state can instantly release the elastic force, the sliding sleeve can be forced to move downwards by the pressure of the first spring 18, at the moment, a section of axial relative gap exists between the clamping tooth 25 and the clamping jaw notch 23, at the moment, the clamping jaw seat 21 can not limit the clamping tooth 25 in the clamping jaw notch 23 any more, the clamping jaw 24 can not be kept in a state of tightening and clamping the choke, the clamping jaw 24 and the clamping tooth 25 can be separated from the clamping jaw notch 23, the choke can be recovered successfully at the well mouth after the tool string is lifted up continuously, and the choke is fished out by other methods.
Claims (5)
1. The utility model provides a downhole choke fishing device, which is characterized in that the device comprises an upper joint, a body, a claw assembly, a push rod and a piston, wherein the upper joint and the body are cylindrical, a thread section is arranged on the inner wall of an upper port of the upper joint, the lower end of the upper joint is fixedly connected with the upper end of the body, the piston is arranged in the upper joint, an outer convex upper limit boss is arranged on the upper end face of the piston, an upper shoulder corresponding to the upper limit boss is arranged on the inner wall of the upper joint below the upper limit boss, a first sliding gap is arranged between the lower end face of the upper limit boss and the upper end face of the upper shoulder, the push rod is arranged in the body, an outer convex lower limit boss is arranged on the upper end face of the push rod, a lower shoulder corresponding to the lower limit boss is arranged on the inner wall of the body below the lower limit boss, a second sliding gap is arranged between the lower end face of the lower limit boss and the upper end face of the lower shoulder, the outer side of the push rod downward along the lower end face of the lower limit boss is provided with a limit groove corresponding to the lower shoulder, the horizontal circumferential direction along the outer side face of the body is provided with a mounting ring groove corresponding to the position of the lower shoulder, at least two first through holes penetrating through the lower shoulder are arranged in the mounting ring groove, an annular tension spring is sleeved in the mounting ring groove, the first through holes are internally provided with lock pins which are limited in the first through holes by the tension spring and continuously push the outer side face of the push rod, the lower shoulder is also internally provided with at least two second through holes distributed along the horizontal circumferential direction, the second through holes are internally provided with first shearing pins for fixing the push rod, the lower end of the push rod downwards extends into the claw assembly, the outer wall of the lower end of the push rod is fixedly connected with a baffle ring for preventing the claw assembly from falling, the claw assembly is fixedly connected with the body through a second shearing pin arranged on the body, the lower extreme inside of body is provided with the first spring of suit on the push rod, first spring is compressed form, the one end roof pressure of first spring is on the lower terminal surface of shoulder down, the other end roof pressure of first spring is on the up end of jack catch subassembly, be provided with the second spring of suit on the jack catch subassembly in the outside of jack catch subassembly, the jack catch subassembly includes the sleeve, the jack catch seat, install section of thick bamboo and jack catch, telescopic upper end cartridge is in this internal and through setting up second shear pin and body fixed connection on the body, telescopic lower extreme is fixed with the upper end of jack catch seat, at least, two jack catch breach have the equipartition along jack catch seat circumferencial direction, the jack catch sets up in the jack catch breach, the lower extreme inner wall upper and lower extreme upper end of jack catch is fixed with the latch on an organic whole, be provided with first section axial slider breach on the telescopic section of thick bamboo wall of jack catch breach, install the section of thick bamboo outside, be provided with the slider pin along circumference interval distribution on the installation section of thick bamboo, all be provided with the slider pin in the slider breach, the inboard roof pressure is on the outer wall of push rod of slider, the slider pin outside, the slider pin is in the draw-in the card hole side, the upper end face of the second spring is provided with the upper end face of the sleeve under the sleeve of the upper end of the sleeve of the second spring, the upper end face of the sleeve is pressed down, the upper end face of the upper end of the spring is connected with the upper end of the second spring.
2. The downhole choke fishing device according to claim 1, wherein at least one first sealing ring is arranged between the outer side of the upper limit boss and the inner wall of the upper joint, at least one second sealing ring is arranged between the outer side of the upper shoulder and the inner wall of the body, and at least one third sealing ring is arranged between the outer side of the lower limit boss and the inner wall of the body.
3. A downhole choke fishing device according to claim 1 or 2, wherein the upper limit boss and the upper shoulder are annular, or/and the lower limit boss and the lower shoulder are annular.
4. A downhole choke fishing device according to claim 1 or 2, wherein the upper joint is in threaded connection with the body.
5. A downhole choke fishing device according to claim 3, wherein the upper joint is in threaded connection with the body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710867633.6A CN107780862B (en) | 2017-09-22 | 2017-09-22 | Fishing device for underground throttler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710867633.6A CN107780862B (en) | 2017-09-22 | 2017-09-22 | Fishing device for underground throttler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107780862A CN107780862A (en) | 2018-03-09 |
| CN107780862B true CN107780862B (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710867633.6A Active CN107780862B (en) | 2017-09-22 | 2017-09-22 | Fishing device for underground throttler |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110439492B (en) * | 2018-05-03 | 2021-11-02 | 中国石油天然气股份有限公司 | Underground choke recycling device and method |
| CN108590559B (en) * | 2018-07-12 | 2024-03-22 | 长江大学 | Underground fishing device |
| CN111946306A (en) * | 2020-08-21 | 2020-11-17 | 中国石油天然气股份有限公司 | Process method of hydraulic deblocking restrictor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19711479A1 (en) * | 1997-03-19 | 1998-09-24 | Bauer Spezialtiefbau | Method for operating a work module and device |
| CN206000503U (en) * | 2016-09-18 | 2017-03-08 | 中国海洋石油总公司 | The retracting device of packer |
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| CN107780862A (en) | 2018-03-09 |
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