CN105114021A - Hanging sealer for installing velocity string in oil pipe and feeding and recovering tool of hanging sealer - Google Patents

Hanging sealer for installing velocity string in oil pipe and feeding and recovering tool of hanging sealer Download PDF

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Publication number
CN105114021A
CN105114021A CN201510589787.4A CN201510589787A CN105114021A CN 105114021 A CN105114021 A CN 105114021A CN 201510589787 A CN201510589787 A CN 201510589787A CN 105114021 A CN105114021 A CN 105114021A
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CN
China
Prior art keywords
piston rod
sealer
connection
mandrel
enclosed
Prior art date
Application number
CN201510589787.4A
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Chinese (zh)
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CN105114021B (en
Inventor
不公告发明人
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湖南唯科拓石油科技服务有限公司
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Priority to CN201510589787.4A priority Critical patent/CN105114021B/en
Publication of CN105114021A publication Critical patent/CN105114021A/en
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Publication of CN105114021B publication Critical patent/CN105114021B/en

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Abstract

The invention discloses a hanging sealer for installing a velocity string in an oil pipe and a feeding and recovering tool of the hanging sealer. The hanging sealer comprises an inner pipe assembly and an outer pipe assembly arranged outside the inner pipe assembly in a sleeving mode; a stop step is arranged on the inner wall of the upper end of the inner pipe assembly, a first clamping jaw is arranged at the lower end of the inner pipe assembly, and a baffle ring is arranged in the first clamping jaw through a shear component; the outer pipe assembly comprises an expanding component with elasticity, a first pushing component, a second pushing component, a releasing component and a seal component, wherein the first pushing component and the second pushing component are arranged on the expanding component and slide along the inner pipe assembly to make the expanding component expand, the releasing component is arranged under the expanding component and slides along the inner pipe assembly to reset the expanding component, and the seal component is arranged between the first pushing component and the second pushing component. The hanging sealer is a special complete device for installing the velocity string in the oil pipe, and the velocity string can be installed in the oil pipe without replacing the oil pipe, so that the liquid carrying capacity of a circulating pipeline of the oil pipe is improved, and the output of an oil and gas well is increased.

Description

The suspension sealer of installation rate tubing string and feeding thereof and recovery instrument in oil pipe
Technical field
The invention belongs to the device for completion and workover treatment in petroleum drilling and mining field, be specifically related to a kind of suspension sealer of installation rate tubing string in oil pipe and feeding thereof and recovery instrument.
Background technology
In oil and gas exploitation industry, can there is permeable phenomenon in the later stage of producing in some wells, occur permeable after underproduce due to natural gas, oil pipe is excessive, and gas flow rate reduces, and fluid-carrying capability can be caused to decline, finally cause Oil/gas Well production declining even to stop production.After there is this phenomenon, adopt following way in oil industry for many years: hydrops is got rid of in 1) provisional artificial lift, but after a time after there will be again same phenomenon; 2) workover treatment, changes the oil pipe of minor diameter, improve fluid-carrying capability, but this method needs large workover cost high.
Summary of the invention
The object of this invention is to provide a kind of without the need to changing oil pipe, in oil pipe, the suspension sealer of installation rate tubing string and feeding thereof and recovery instrument, to improve the fluid-carrying capability of circulation passage, increase Oil/gas Well output.
Suspension sealer provided by the invention, comprises interior pipe assembly and is enclosed within the outer tube assembly outside interior pipe assembly; The upper end inwall of described interior pipe assembly is provided with stopping step, and lower end is provided with the first claw, is provided with baffle ring in the first claw by cutting member; Described outer tube assembly comprises tool flexible spreading parts, be located at above described spreading parts and make the first push mechanism of spreading parts spreading and the second push mechanism along described interior pipe component slippage, be located at the releasing parts making spreading member reset below described spreading parts along described interior pipe component slippage, is provided with seal member between the first push mechanism and the second push mechanism; First and second push mechanism described respectively and be respectively equipped with first, second between described interior pipe assembly and spreading parts and shear positioning element; Described first claw with adopt occlusion structure to be connected between described releasing parts releasing parts is located.
Described interior pipe assembly comprises interconnective first top connection, the first mandrel, and described first claw is located at the lower end of the first mandrel, and described stopping step is located at the upper end inwall of the first top connection; The first push mechanism in described outer tube assembly comprises and is enclosed within pushing cylinder in described first top connection and is enclosed within the center tap be connected on the first mandrel and with described pushing cylinder, described second push mechanism is the seat of honour, and described seal member comprises the some packing elements be enclosed within described first mandrel between described center tap and the described seat of honour; The first lower contact that described releasing parts comprises lower seat and is connected with lower seat; Described first shears positioning element is located between described pushing cylinder and the first top connection; Described spreading parts employing slip system is located between the described seat of honour with lower seat and coordinates with the seat of honour and lower seat, and described second shears positioning element is located between the described seat of honour and slip system.
The running tool of suspension sealer provided by the invention, comprises the piston rod portion of tubulose and is enclosed within the piston rod part that piston rod portion can slide up and down along piston rod portion; Formed between described piston rod portion with piston rod part and the plunger shaft be communicated with in the pipe of piston rod, the lower end of described piston rod part is provided with the drive disk assembly matched with push mechanism in described suspension sealer, and the lower end of described piston rod portion is provided with the linkage matched with pipe assembly interior in described suspension sealer; Described linkage comprise be located at described piston rod portion lower end by sealing device and establish the locking bar of bulge loop, be connected with described piston rod portion and be enclosed within lock tube on locking bar, be located at lock tube controls to match with the stopping step on pipe assembly in described suspension sealer by the bulge loop on locking bar lock dog, to shear the shearing positioner that positioning element makes described locking bar locate by the 3rd.
Described piston rod portion comprise the second top connection, the central tube be threaded with the second top connection, be threaded with central tube be threaded connection by some sections of piston rods the piston rod formed, the locking bar in described linkage is connected with next section of piston rod; Described piston rod part comprise be enclosed within described central tube and the upper joint sleeve be threaded, with upper joint sleeve be threaded by some sections of piston rods corresponding with described each section of piston rod, described plunger shaft comprises by the valve piston chamber all formed between each section of mutually corresponding piston rod and piston rod, shear positioning element respectively by the 3rd between neighbouring two sections of piston rods to connect, described drive disk assembly is connected with next section of piston rod.
Described shearing positioner comprises and is located in described lock tube and allows the first shear sleeve that described locking bar passes through, shear the shearing ring that positioning element is connected with the first shear sleeve by the 4th.
The recovery instrument of suspension sealer provided by the invention, comprise a rhabodoid, matching with the baffle ring of described suspension sealer lower end in the lower end of described rhabodoid, is provided with the second claw matched with the stopping step of pipe assembly upper end in described suspension sealer around the middle part of described rhabodoid.
Described rhabodoid comprises at the bottom of variable buckle joint, the second mandrel, the 3rd top connection, the first spring, overcoat, the second spring, stop collar, slip ring, extension bar, cylinder, the second lower contact, the 3rd claw, the second shear sleeve, tail; Described variable buckle joint is connected with the second mandrel by internal thread; 3rd top connection shears positioning element fixed cover on the second mandrel by the 5th, and is connected with overcoat with external screw thread; The first spring be enclosed within the second mandrel is provided with in 3rd top connection, the stop collar be enclosed within the second mandrel is provided with in overcoat, the first lower spring end is withstood in the upper end of stop collar, and be provided with in overcoat and be enclosed within the second spring on stop collar and slip ring, described second claw is located at slip ring bottom; Second mandrel is connected with extension bar by screw thread; Extension bar and cylinder are threaded connection; The lower end of cylinder is connected with the second lower contact by screw thread, and the second lower contact outer cover has the 3rd claw; Second lower contact is sheared positioning element with cover the second shear sleeve thereon by the 6th and is fixed, and is threaded connection at the bottom of the lower end of the second lower contact and tail.
Beneficial effect
The present invention is the Special complete equipment of installation rate tubing string in oil pipe, by the present invention without the need to change oil pipe just can in oil pipe installation rate tubing string, thus improve the fluid-carrying capability of oil pipe circulation passage, increase Oil/gas Well output.
Below in conjunction with accompanying drawing, technical scheme of the present invention is described.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention hangs sealer.
Fig. 2 is the structural representation that the present invention hangs the running tool of sealer.
Fig. 3 is I place's enlarged drawing in Fig. 2.
Fig. 4 is the structural representation that the present invention hangs the recovery instrument of sealer.
Fig. 5 is the scheme of installation of minor diameter speed tubing string.
Fig. 6 is that the present invention hangs sealer feeding process schematic.
Fig. 7 is that the present invention hangs sealer removal process schematic diagram.
Detailed description of the invention
See Fig. 1, suspension sealer 1 of the present invention comprise top connection 101, pushing cylinder 102, center tap 105, mandrel 108, packing element 109,110, the seat of honour 112, slips 114, slips cylinder 116, lower seat 117, claw 119, lower contact 124, the upper end inwall of described top connection 101 is provided with stopping step 1011, the lower end of top connection 101 and the upper end of mandrel 108 adopt and are threaded and use O shape to enclose 104 sealings, lower end and the claw 119 of mandrel 108 are threaded connection, pushing cylinder 102 is enclosed within outside top connection 101, be provided with shear pin 103 between top connection 101 and pushing cylinder 102 to locate, center tap 105, the seat of honour 112, lower seat 117 and lower contact 124 are enclosed within outside mandrel 108 from top to bottom, the lower end of center tap 105 and pushing cylinder 102 is threaded, center tap 105 inside is provided with fluting lock ring 106 and adopts and be threaded into mandrel 108 and prevent center tap 105 from retreating, center tap 105 is provided with the anti-spline of soket head cap screw 107, be provided with between center tap 105 and the seat of honour 112 and be enclosed within two packing elements 109 on mandrel 108 and a packing element 110 between packing element 109, separate with spacer ring 111 between packing element 109 and packing element 110, the slip system be enclosed within mandrel 108 is provided with between the seat of honour 112 and lower seat 117, slip system comprises slips cylinder 116, be provided with 4 slips 114 in slips cylinder 116 axially to be coordinated by inclined-plane with the seat of honour 112 and lower seat 117, a spring 115 is had to make it keep return state in each slips 114, slips cylinder 116 is enclosed within outside the seat of honour 112 and lower seat 117, be connected by shear screw 113 between the seat of honour 112 with slips cylinder 116, locate with cheese head screw 125 between slips cylinder 116 and lower seat 117, lower seat 117 is connected by screw thread with lower contact 124 and is provided with dog screw 118 and prevents screw thread from getting loose, employing multiple spot threaded engagement structure 126 between claw 119 with lower contact 124 is connected makes lower contact 124 locate, O shape circle 120 is respectively equipped with and O shape circle 211 seals with mandrel 108 and lower contact 124 inside and outside claw 119, baffle ring 123 is provided with in the lower end of claw 119, baffle ring 123 is connected by shear pin 122 with claw 119.Suspension sealer 1 promotes pushing cylinder 102 by the running tool 2 hanging sealer and realizes setting.
See Fig. 2, the running tool 2 that the present invention hangs sealer comprises top connection 201, central tube 204, upper joint sleeve 205, piston rod, piston rod 210, pushing cylinder 212, latching connector 213, locking bar 215, lock tube 217, lock dog 216, shear sleeve 218, shearing ring 220, lower conehead 221, sealed steel ball 214, central tube 204 is threaded with top connection 201 lower end, and with O shape circle 202 sealing, locks with check screw 203, upper joint sleeve 205 is enclosed within the stage casing of central tube 204, is threaded with central tube 204, and locks with check screw 203, piston rod is by upper, middle and lower three sections of piston rods 210,210 ', 210, and " be threaded connection and form and use O type circle 209 to seal, epimere piston rod 210 is threaded with the hypomere of central tube 204, and seals with O type circle 209, piston rod is by upper, middle and lower three sections of piston rods 207,207 ', 207 " form, be respectively equipped with cut groove, shear screw hole connecting by shearing nail 206 between neighbouring two sections of piston rods, piston-cylinder is on central tube 204 and piston rod, three sections of piston rods 207,207 ', 207 " respectively with three sections of piston rods 210,210 ', 210 " are corresponding is combined into three valve piston chambeies, and every section of piston rod is equipped with perforate 222 makes each valve piston chamber all be communicated with the central passage of central tube, there is cut groove the lower end of upper joint sleeve 205, epimere piston rod 207 to be coordinated with the cut groove on upper joint sleeve 205 by shear screw 206 and is connected with upper joint sleeve 205, the lower end of epimere piston rod 207 is provided with cut groove, use shear screw 206 to be connected with the shear screw hole of stage casing piston rod 207 ' and and be provided with O shape between epimere piston rod 210 and enclose 208, 209 make it seal, the lower end of stage casing piston rod 207 ' is provided with cut groove, use shear screw 206 and hypomere piston rod 207 " shear screw hole be connected and and be provided with O shape between stage casing piston rod 210 ' and enclose 208, 209 make it seal, be provided with O shape between hypomere piston rod 207 " lower end be provided with cut groove be connected and and hypomere piston rod 210 with the shear screw hole of lower joint sleeve 211 by shear screw 206 " and enclose 208, 209 make it seal, pushing cylinder 212 is threaded with lower joint sleeve 211, lock tube 217 is by latching connector 213 and hypomere piston rod 210, and " be connected, latching connector 213 is connected by internal thread and with seal with O ring, is connected with the upper end of lock tube 217 by external screw thread simultaneously, locking bar 215 is located in latching connector 213 and lock tube 217 and latching connector 213 and lock tube 217 clearance sliding fit, and is provided with seal with O ring, lock tube 217 is opened four square holes, be provided with a lock dog 216 and square hole matched in clearance in each square hole, lock dog 216 be along the circumferential direction provided with the muscle slightly wider than the square hole that lock tube 217 is opened, prevent lock dog 216 from dropping out from the square hole lock tube 217, shear sleeve 218 consists of shear screw 219 and shearing ring 220 shears positioner, be located in lock tube 217 and lock tube 217 matched in clearance, and the interior hole size of shear sleeve 218 can make the lower end of locking bar 215 pass through smoothly, lower conehead 221 is connected with lock tube 217 by external screw thread, and just withstands the shear sleeve 218 in lock tube 217, and the endoporus of lower conehead 221 can make shearing ring 220 pass through smoothly, the upper end of locking bar 215 is provided with sealing taper hole and sealed steel ball 214 fitted seal, and the lower end of locking bar 215 is provided with a circle bulge loop 2151 and matches with the lock dog 216 on lock tube 217.The running tool 2 hanging sealer during use is connected with top coiled tubing by top connection 201.
See Fig. 4, the recovery instrument 3 that the present invention hangs sealer comprises variable buckle joint 301, to reclaim at the bottom of mandrel 303, top connection 304, spring 305, overcoat 306, spring 307, stop collar 308, slip ring 309, claw 310, extension bar 312, cylinder 314, lower contact 315, claw 316, shear sleeve 317, tail 319; Variable buckle joint 301 is connected with recovery mandrel 303 by internal thread, and seals with O shape circle 302; Top connection 304 is being reclaimed on mandrel 303 by shear pin 320 fixed cover, and is connected with overcoat 306 with external screw thread; The spring 305 being enclosed within and reclaiming on mandrel 303 is provided with in top connection 304, the stop collar 308 being enclosed within and reclaiming on mandrel 303 is provided with in overcoat 306, spring 305 lower end is withstood in the upper end of stop collar 308, be provided with in overcoat 306 and be enclosed within spring 307 on stop collar 308 and slip ring 309, slip ring 309 bottom is provided with 4 claws 310; Reclaim mandrel 303 to be connected with extension bar 312 by screw thread, and seal with O shape circle 311; Be provided with 2 O shape circles 313 outside extension bar 312, and be threaded connection with cylinder 314; The lower end of cylinder 314 is connected with lower contact 315 by screw thread, and lower contact 315 outer cover has claw 316; Lower contact 315 and cover shear sleeve 317 is thereon fixed by 6 shear pins 318, and at the bottom of the lower end of lower contact 315 and tail, 319 are threaded connection.During use, the recovery instrument 3 hanging sealer is threadedly attached to coiled tubing by variable buckle joint 301.
Described shear pin, shear screw are shearing positioning element.
Operating principle
As shown in Figure 5, oil pipe 4 has been installed to the flow string in sleeve pipe 6 before being in the installation of minor diameter speed tubing string, and minor diameter speed tubing string 5 is sealingly clamped in oil pipe 4 by hanging sealer 1, is reduced by the passage of circulation, improves the fluid-carrying capability of well.The installation of hanging sealer comprises feeding and removal process.
One, hang sealer and send into process
Suspension sealer of the present invention sends into process as shown in Figure 6, is divided into three process: A) be connected with suspension sealer; B) pressurize setting procedure; C) to give up process.
A) be connected with suspension sealer: as shown in Figure 6 (a), when running tool 2 is sent into, the lock tube 217 of running tool 2 inserts in the top connection 101 of suspension sealer 1, lock dog 216 is ejected by the bulge loop 2151 of locking bar 215, be locked in the stopping step 1011 of suspension sealer 1 top connection 101, entirety is suspended in midair in lower going-into-well, until designated depth by the coiled tubing be connected with the top connection 201 of running tool 2.
B) pressurize setting procedure: when starting setting, ground is to coiled tubing internal pressurization, and liquid enters running tool 2 by top connection 201 endoporus of running tool 2, seals by sealed steel ball 214 and locking bar 215 in bottom.Therefore, pressure is entered and each valve piston chamber by the perforate 222 on central tube 204 and each section of piston rod, and promote piston rod to underground moving, now can cut off the upper and lower piston rod of shear pin 206(can relative motion in stroke range), and promote the pushing cylinder 102 that pushing cylinder 212 acts on suspension sealer, as shown in Figure 6 (b).Now, pushing cylinder 102 cuts off shear pin 103, starts to promote center tap 105, and extrudes packing element 109,110 spreading, and is extruded by slips 114 by the seat of honour 112, makes slips 114 firmly grasp oil pipe 4 inwall, realizes hanging sealer 1 setting (see Fig. 1, Fig. 5).
C) to give up process: after being forced into setting completing, pressure continues to raise, when the shearing force of shearing positioner of shear sleeve 218, shear screw 219, shearing ring 220 composition can not block the thrust that pressure formed to sealed steel ball 214 and locking bar 215 again, shear screw 219 is cut off, pressure is pushed into top before sealed steel ball 214, locking bar 215, shearing ring 220, now lock dog 216 drops into outside the bulge loop 2151 of locking bar 215, as shown in Figure 6 (c), now running tool 2 is given up with suspension sealer 1.
Two, sealer removal process is hung
Suspension sealer removal process of the present invention as shown in Figure 7, recovery instrument 3 is inserted and hangs in sealer 1, utilize the claw 316 of recovery instrument 3 lower end first to catch at the unlocked position B hanging sealer 1 baffle ring 123 hung on sealer 1 from down upwards to carry and cut off shear pin 122, the claw 119 now hanging sealer 1 departs from baffle ring 123, therefore the threaded engagement structure 126 between claw 119 and lower contact 124 is discharged, lower seat 117 moves down together with lower contact 124, slips 114 and packing element 109, 110 reset, suspension sealer 1 is made to discharge (see Fig. 1 from oil pipe 4, Fig. 5), recovery instrument 3 is caught at salvaging A place, position claw 310 and is hung sealer 1, upwards carry coiled tubing and the tubing string 5 hanging sealer 1 and connection is recovered to ground.

Claims (7)

1. a suspension sealer, is characterized in that the outer tube assembly comprising interior pipe assembly and be enclosed within outside interior pipe assembly; The upper end inwall of described interior pipe assembly is provided with stopping step, and lower end is provided with the first claw, is provided with baffle ring in the first claw by cutting member; Described outer tube assembly comprises tool flexible spreading parts, be located at above described spreading parts and make the first push mechanism of spreading parts spreading and the second push mechanism along described interior pipe component slippage, be located at the releasing parts making spreading member reset below described spreading parts along described interior pipe component slippage, is provided with seal member between the first push mechanism and the second push mechanism; First and second push mechanism described respectively and be respectively equipped with first, second between described interior pipe assembly and spreading parts and shear positioning element; Described first claw with adopt occlusion structure to be connected between described releasing parts releasing parts is located.
2. suspension sealer according to claim 1, it is characterized in that described interior pipe assembly comprises interconnective first top connection, the first mandrel, described first claw is located at the lower end of the first mandrel, and described stopping step is located at the upper end inwall of the first top connection; The first push mechanism in described outer tube assembly comprises and is enclosed within pushing cylinder in described first top connection and is enclosed within the center tap be connected on the first mandrel and with described pushing cylinder, described second push mechanism is the seat of honour, and described seal member comprises the some packing elements be enclosed within described first mandrel between described center tap and the described seat of honour; The first lower contact that described releasing parts comprises lower seat and is connected with lower seat; Described first shears positioning element is located between described pushing cylinder and the first top connection; Described spreading parts employing slip system is located between the described seat of honour with lower seat and coordinates with the seat of honour and lower seat, and described second shears positioning element is located between the described seat of honour and slip system.
3. hang a running tool for sealer, it is characterized in that comprising the piston rod portion of tubulose and be enclosed within the piston rod part that piston rod portion can slide up and down along piston rod portion; Formed between described piston rod portion with piston rod part and the plunger shaft be communicated with in the pipe of piston rod, the lower end of described piston rod part is provided with the drive disk assembly matched with push mechanism in described suspension sealer, and the lower end of described piston rod portion is provided with the linkage matched with pipe assembly interior in described suspension sealer; Described linkage comprise be located at described piston rod portion lower end by sealing device and establish the locking bar of bulge loop, be connected with described piston rod portion and be enclosed within lock tube on locking bar, be located at lock tube controls to match with the stopping step on pipe assembly in described suspension sealer by the bulge loop on locking bar lock dog, to shear the shearing positioner that positioning element makes described locking bar locate by the 3rd.
4. hang the running tool of sealer according to claim 3, it is characterized in that described piston rod portion comprise the second top connection, the central tube be threaded with the second top connection, be threaded with central tube be threaded connection by some sections of piston rods the piston rod formed, the locking bar in described linkage is connected with next section of piston rod; Described piston rod part comprise be enclosed within described central tube and the upper joint sleeve be threaded, with upper joint sleeve be threaded by some sections of piston rods corresponding with described each section of piston rod, described plunger shaft comprises by the valve piston chamber all formed between each section of mutually corresponding piston rod and piston rod, shear positioning element respectively by the 3rd between neighbouring two sections of piston rods to connect, described drive disk assembly is connected with next section of piston rod.
5. according to claim 3 or 4, hang the running tool of sealer, it is characterized in that described shearing positioner comprises and be located in described lock tube and allow the first shear sleeve that described locking bar passes through, the shearing ring be connected with the first shear sleeve by the 4th shearing positioning element.
6. one kind is hung the recovery instrument of sealer, it is characterized in that comprising a rhabodoid, matching with the baffle ring of described suspension sealer lower end in the lower end of described rhabodoid, is provided with the second claw matched with the stopping step of pipe assembly upper end in described suspension sealer around the middle part of described rhabodoid.
7. hang the recovery instrument of sealer according to claim 6, it is characterized in that described rhabodoid comprises at the bottom of variable buckle joint, the second mandrel, the 3rd top connection, the first spring, overcoat, the second spring, stop collar, slip ring, extension bar, cylinder, the second lower contact, the 3rd claw, the second shear sleeve, tail; Described variable buckle joint is connected with the second mandrel by internal thread; 3rd top connection shears positioning element fixed cover on the second mandrel by the 5th, and is connected with overcoat with external screw thread; The first spring be enclosed within the second mandrel is provided with in 3rd top connection, the stop collar be enclosed within the second mandrel is provided with in overcoat, the first lower spring end is withstood in the upper end of stop collar, and be provided with in overcoat and be enclosed within the second spring on stop collar and slip ring, described second claw is located at slip ring bottom; Second mandrel is connected with extension bar by screw thread; Extension bar and cylinder are threaded connection; The lower end of cylinder is connected with the second lower contact by screw thread, and the second lower contact outer cover has the 3rd claw; Second lower contact is sheared positioning element with cover the second shear sleeve thereon by the 6th and is fixed, and is threaded connection at the bottom of the lower end of the second lower contact and tail.
CN201510589787.4A 2015-09-17 2015-09-17 The suspension sealer of installation speed tubing string and its feeding and recycling tool in oil pipe CN105114021B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510589787.4A CN105114021B (en) 2015-09-17 2015-09-17 The suspension sealer of installation speed tubing string and its feeding and recycling tool in oil pipe

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Application Number Priority Date Filing Date Title
CN201510589787.4A CN105114021B (en) 2015-09-17 2015-09-17 The suspension sealer of installation speed tubing string and its feeding and recycling tool in oil pipe

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CN105114021A true CN105114021A (en) 2015-12-02
CN105114021B CN105114021B (en) 2019-01-15

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CN107420059A (en) * 2016-05-23 2017-12-01 美钻能源科技(上海)有限公司 Subsea production tree tubing hanger center plug takes out instrument

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