CN103015929B - Casting-fishing tool with strength-sensing position - Google Patents
Casting-fishing tool with strength-sensing position Download PDFInfo
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- CN103015929B CN103015929B CN201210539350.6A CN201210539350A CN103015929B CN 103015929 B CN103015929 B CN 103015929B CN 201210539350 A CN201210539350 A CN 201210539350A CN 103015929 B CN103015929 B CN 103015929B
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Abstract
The invention discloses a casting-fishing tool with strength-sensing position, comprising a cylindrical tube body provided with a first, second and third flanges at intervals; a slot hole is arranged between the second and third flanges and is internally provided with a cam, the cam is provided with a start end part and a tail end part provided with a sharp corner part, a stop part is arranged at the inside end face of the cam in a protruding mode, a trigger is arranged inside the first flange and is provided with a clamp edge on the side part, a first press spring is arranged between the clamp edge and the first flange, a steel wire penetrates through the closing end of the tube body to be connected with the trigger, a linkage post for controlling the start end part of the cam to butt is arranged below the clamp edge, a through slot is arranged below the third flange of the tube body, a support arm is eccentrically pivoted in the tube body along the though slot and is provided with a through hole, a slide seat is arranged between the support arm and the third flange, a second press spring is arranged between the slide seat and the third flange, and a trigger rod is arranged at the bottom end of the trigger and penetrates through the through hole of the support arm. According to the casting-fishing tool with strength-sensing position, accurate mechanical positioning is realized through spring preset force and the cam, and the casting-fishing requirements of large-sized injection mining tools can be met.
Description
Technical field
The invention relates to a kind of oil-field flooding special operation instrument, particularly relate to a kind of power sense location pulling and running tool for carrying out pulling operation to down-hole large scale intelligent watering device.
Background technology
China's separate zone waterflooding technology achieves remarkable effect in economical and effective exploitation, Sustainable high yield stable yields, raising waterflood recovery efficiency factor etc., and be in a leading position level in the world.Development separate zone waterflooding technology, realize effective water filling, suggestions for improvement is the inevitable choice of high water cut viscous heavy crude oil.For large-sized intelligent watering device, existing pulling mode adopts steel pipe type cable to carry out pulling; But this mode has following defect, steel pipe type cable is especially easily damaged on the one hand, and ground Communication Control short circuit also needs to use steel pipe type cable winch simultaneously simultaneously, causes device conflict, and joint connection in site is inconvenient; Pulling power on the other hand required by large scale intelligent watering device is comparatively large, and steel pipe type cable intensity is lower, cannot bear larger pulling power.If adopt the steel wire machinery pulling with larger pulling power, there will be again and locate inaccurate or the problems such as location cannot be realized, cause pulling failure.
Thus, the present inventor relies on experience and the practice of being engaged in relevant industries for many years, proposes a kind of power sense location pulling and running tool, to overcome the defect of prior art.
Summary of the invention
The object of the present invention is to provide a kind of power sense to locate pulling and running tool, utilize steel wire to carry out pulling, realize machinery accurately location, to realize the accurate location of large scale intelligent watering device and accurate pulling operation by spring preset force and cam.
The object of the present invention is achieved like this, a kind of power sense location pulling and running tool, and described pulling and running tool comprises the cylindrical tube of a upper end closed, and the inside wall of described body is interval with the first flange, the second flange and the 3rd flange from top to bottom, body between described second flange with the 3rd flange is provided with through slotted eye on relative both sides tube wall, the control cam that one rotating shaft and body axis are serrated vertical is set in this slotted eye, rotating shaft is provided with the torsion spring leaning cam, this control cam is made up of four/three-arc shape disk body, and the top portion of formation control cam and terminal part, the arc diameter of described control cam is identical with the external diameter of body, control the terminal part of cam and be provided with the corners that a radial dimension is greater than circular arc radial dimension, the inner side end of described control cam is away from the fan-shaped stopper section of rotating shaft place projection one, described first flange inner arranges a cylindrical trigger slidably, this trigger lateral wall is provided with the edge clipping be arranged in above the second flange, the first stage clip is provided with between edge clipping and the first flange, one steel wire passes the blind end on described body top and is connected to trigger upper end, be provided with one below edge clipping and convexedly stretch in connecting column below the second flange, described connecting column sidewall and the top portion controlling cam against, tube wall below described body the 3rd flange is provided with the saturating groove that extends to body bottom, in body, a support arm and the connector hinged with support arm is provided with along this saturating groove, described support arm is articulated in body prejudicially, side, support arm top is set to circular arc, opposite side is set to inclined-plane, and support arm top center is provided with a perforation, between described support arm top and the 3rd flange, the sliding slide establishing to be provided with open-work, is provided with the second stage clip between slide and the 3rd flange, the connecting column of described trigger is fixed with a trigger rod, described trigger rod passes through the open-work of the 3rd flange and slide and is arranged in the perforation at support arm top.
In a better embodiment of the present invention, described body is linked in sequence by the first body, the second body and the 3rd body and forms; Described first body increases the weight of roofbolt by one of lower ending opening and forms, and this weighted lever post is axially arranged with can through the perforation of steel wire; Described first flange, the second flange, the 3rd flange and slotted eye are all arranged on the second body; Described groove is arranged on the 3rd body.
In a better embodiment of the present invention, described first flange is made up of the union connecting the first body and the second body; Described Bearing Angle is provided with one for the steel wire head of fixing steel wire.
In a better embodiment of the present invention, described support arm lower end is provided with the top supporting described connector top, and this top is provided with the inclined-plane of inclination; Described connector top is provided with and coordinates with described top the contact jaw contacted.
In a better embodiment of the present invention, bottom described connector, be provided with the link connecting and throw in union and fishing joint.
In a better embodiment of the present invention, described control cam is axial double-decker, described two-layer between spacing be greater than the diameter of trigger rod and be less than the diameter of trigger connecting column; Described double-decker is connected as one by corners and fan-shaped stopper section.
From the above mentioned, power sense location of the present invention pulling and running tool, steel wire is utilized to carry out pulling, matched by the gathering sill that power responds to spring preset force, control cam and side-pocket mandrel, the requirement of the larger pulling power of large scale intelligent watering device needs can either be met, machinery accurately location can be realized again, pulling success rate can be increased substantially; Pulling and running tool is comparatively strong to surrounding environment compliance simultaneously, can realize accurate location under fouling, condition of shaking out.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein:
Figure 1A: for power sense location of the present invention pulling and running tool is in the structural representation of contraction state.
Figure 1B: be the schematic side view of Figure 1A.
Fig. 2 A: for power sense location of the present invention pulling and running tool is in the structural representation of open mode.
Fig. 2 B: be the schematic side view of Fig. 2 A.
Fig. 3 A: for controlling the perspective view of cam in the present invention.
Fig. 3 B: for controlling the sectional structure schematic diagram of cam in the present invention.
Fig. 4 A: be the perspective view of support arm in the present invention.
Fig. 4 B: be the sectional structure schematic diagram of support arm in the present invention.
Fig. 5 A ~ Fig. 5 D: locate the schematic flow sheet that pulling and running tool carries out throwing in operation for utilizing power sense of the present invention.
Fig. 6 A ~ Fig. 6 D: locate the schematic flow sheet that pulling and running tool carries out fishing for utilizing power sense of the present invention.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.
As shown in Figure 1A, Figure 1B, Fig. 2 A, Fig. 2 B, the present invention proposes a kind of power sense location pulling and running tool 100, described pulling and running tool 100 comprises the cylindrical tube 1 of a upper end closed, and the inside wall of described body 1 is interval with the first flange 11, second flange 12 and the 3rd flange 13 from top to bottom, described second flange 12 is provided with through slotted eye 14 with the body 1 between the 3rd flange 13 on relative both sides tube wall, the control cam 2 that one rotating shaft and body 1 axis are serrated vertical is set in this slotted eye 14, cam shaft is provided with the torsion spring 25 leaning cam, as Fig. 3 A, shown in Fig. 3 B, this control cam 2 is made up of four/three-arc shape disk body, and the top portion 21 of formation control cam 2 and terminal part 22, the arc diameter of described control cam 2 is identical with the external diameter of body 1, control the terminal part 22 of cam 2 and be provided with the corners 23 that a radial dimension is greater than circular arc radial dimension, the inner side end of described control cam 2 is away from the fan-shaped stopper section 24 of rotating shaft place projection one, described first flange 11 inner slide a cylindrical trigger 3 is set, this trigger 3 lateral wall is provided with the edge clipping 31 be arranged in above the second flange 12, the first stage clip 4 is provided with between edge clipping 31 and the first flange 11, one steel wire 9 passes the blind end on described body 1 top and is connected to trigger 3 upper end, be provided with one below edge clipping 31 and convexedly stretch in connecting column 32 below the second flange 12, described connecting column 32 sidewall and the top portion 21 controlling cam 2 against, tube wall below described body the 3rd flange 13 is provided with the saturating groove 15 that extends to body 1 bottom, in body 1, a support arm 5 and the connector 6 hinged with support arm 5 is provided with along this saturating groove 15, described support arm 5 is articulated in body 1 prejudicially, as shown in Fig. 4 A, Fig. 4 B, side, support arm 5 top is set to circular arc, opposite side is set to inclined-plane, and support arm 5 top center is provided with a perforation 51, between described support arm 5 top and the 3rd flange 13, the sliding slide 7 establishing to be provided with open-work, is provided with the second stage clip 8 between slide 7 and the 3rd flange 13, the connecting column 32 of described trigger 3 is fixed with a trigger rod 33, described trigger rod 33 passes through the open-work of the 3rd flange 13 and slide 7 and is arranged in the perforation 51 at support arm 5 top.
As shown in Figure 1A, Fig. 2 A, in the present embodiment, described body 1 can be linked in sequence by the first body 101, second body 102 and the 3rd body 103 and form; Described first body 101 increases the weight of roofbolt by one of lower ending opening and forms, and this weighted lever post is axially arranged with can through the perforation 1011 of steel wire 9; Described first flange 11, second flange 12, the 3rd flange 13 and slotted eye 14 are all arranged on the second body 102; Described groove 15 is arranged on the 3rd body 103.Further, in the present embodiment, described first flange 11 can be made up of a union of connection first body 101 and the second body 102; Described trigger 3 top is provided with one for the steel wire head 91 of fixing steel wire 9.
As shown in Fig. 3 A, Fig. 3 B, in the present embodiment, described control cam 2 is axial double-decker (that is: be made up of two spaced and parallel connections of four/three-arc shape disk body), spacing between described two-layer disk body be greater than the diameter of trigger rod 33 and the diameter being less than trigger connecting column 32 (that is, trigger rod 33 can pass between two-layer disk body, and connecting column 32 can not; When pulling and running tool 100 is in contraction state, the sidewall of connecting column 32 is with top portion 21 abutting contact controlling cam 2); Described double-decker is connected as one (that is, being connected by corners 23 and fan-shaped stopper section 24 between two disk bodies) by corners 23 and fan-shaped stopper section 24; The center controlling the two-layer disk body of cam 2, respectively by bearing pin and body pivot joint, makes control cam 2 can rotate in the slotted eye 14 of body.
As shown in Fig. 4 A, Fig. 4 B, in the present embodiment, described support arm 5 lower end is provided with the top 52 supporting described connector 6 top, and this top 52 is provided with the inclined-plane of inclination; Described connector 6 top is provided with and coordinates with described top 52 contact jaw 61 (as shown in Figure 1A) contacted; The link 62 connecting and throw in union and fishing joint is provided with bottom described connector 6.
Power sense location of the present invention pulling and running tool operationally, pull the steel wire 9 being connected to steel wire head 91, when the pressure of pulling force more than the first stage clip 4 (power induction spring), steel wire head 91 can be pulled, trigger 3 body 1 relative to trigger rod 33 moves up, when trigger rod 33 is drawn out the perforation 51 on support arm 5, slide 7 promotes support arm 5 under the effect of the second stage clip 8, because described support arm 5 is articulated on body 1 prejudicially, and side, support arm 5 top is set to circular arc, the thrust of the second stage clip 8 can produce the moment that support arm 5 is rotated on support arm 5, support arm 5 is opened (as shown in Figure 2 A), the angle opened controls by the bevel angle of support arm 5 top opposite side, and support arm 5 and the contact surface of connector 6 also exist an identical angle, after can ensureing that support arm 5 is opened, and the axis of connector 6 and the axis being parallel (as shown in Figure 2 A) of body 1.After support arm 5 is opened, because the relative body 1 of trigger 3 moves up, indentation on the connecting column 32 of trigger 3 lower end is made to enter in the second flange 12, and depart from control cam 2 top portion 21 against, control cam 2 to rotate at the clockwise under influence of torsion spring 25, the fan-shaped stopper section 24 of control cam 2 is made to lean at trigger rod 33 sidewall, the corners 23 controlling cam 2 rotates in slotted eye 14, simultaneously, the arc wheel face controlling cam 2 withstands the bottom of trigger connecting column 32, prevents trigger 3 from moving down under the effect of the first stage clip 4.
From the above mentioned, power sense location of the present invention pulling and running tool, its advantage has power induction positioning function, can realize the accurate location of pulling and running tool, meet large-scale note and adopt instrument pulling needs, can increase substantially pulling success rate; Pulling and running tool is comparatively strong to surrounding environment compliance simultaneously, can realize accurate location under fouling, condition of shaking out.
Contrast the pulling operation process of accompanying drawing to power sense location of the present invention pulling and running tool below and make description.
The input course of work is as follows:
As shown in Fig. 5 A ~ Fig. 5 D, during input, power sense location pulling and running tool 100 is in contraction state, and be connected with injection well downhole flow regulator 500 (prior art) by throwing in joint 300 (prior art), utilize steel wire 9 by power sense location pulling and running tool 100, throw in joint 300 and injection well downhole flow regulator 500 lower going-into-well cylinder, in decentralization process, because pit shaft internal diameter is limited, the control cam 2 of power sense location pulling and running tool 100 can be subject to an anticlockwise moment of friction, control cam 2 and will be rotated counterclockwise an angle, the corners 23 controlling cam 2 is made to rotate in the slotted eye 14 of body 1, ensure this power sense location pulling and running tool 100 smooth under enter, as shown in Figure 5A, when power sense location pulling and running tool 100 is lowered into side-pocket mandrel 200 bottom, because radial space increases, control cam 2 and (rotate clockwise an angle by resetting under the effect of torsion spring 25, until the top portion 21 controlling cam 2 is resisted against the sidewall of trigger connecting column 32, it is stoped to continue to rotate clockwise), as shown in Figure 5 B, on carry steel wire 9, control cam 2 in the pulling and running tool 100 of power sense location is by along the gathering sill in side-pocket mandrel 200, (gathering sill is prior art, this gathering sill top closure) move up, when controlling to suffer restraints when cam 2 moves to gathering sill top, control cam 2 no longer to move up, steel wire 9 is carried on now continuing, when the power above carried is enough to the pressure of balance first stage clip (power induction spring) 4, steel wire 9 will drive steel wire head 91, trigger 3 and trigger rod 33 upward sliding, thus be pulled out from the perforation 51 of support arm 5 bottom of trigger rod 33, now be subject to the constraint of side-pocket mandrel 200 internal diameter, the support arm 5 of power sense location pulling and running tool 100 does not eject (opening), and power sense location pulling and running tool 100 is still in contraction state, as shown in Figure 5 C.Continuation is carried steel wire 9, when power sense location pulling and running tool 100, input joint 300 and injection well downhole flow regulator 500 enter the eccentric part of side-pocket mandrel 200 completely, because radial space increases, promotion slide 7 moves downward by the second stage clip 8 in the pulling and running tool 100 of power sense location, support arm 5 is ejected, makes injection well downhole flow regulator 500 be positioned at above setting position; Transfer steel wire 9, power sense location pulling and running tool 100 will transfer to operating position with injection well downhole flow regulator 500, on carry steel wire 9, cut off the shear pin (for prior art) thrown between joint 300 and injection well downhole flow regulator 500, power sense location pulling and running tool 100 and input joint 300 are regained ground, as shown in Figure 5 D.
Salvage process is as follows:
As shown in Fig. 6 A ~ Fig. 6 D, during input, power sense location pulling and running tool 100 is in contraction state, fishing joint 400 (prior art) is connected with bottom the pulling and running tool 100 of power sense location, utilize steel wire 9 by power sense location pulling and running tool 100, fishing joint 400 lower going-into-well cylinder, in decentralization process, because pit shaft internal diameter is limited, the control cam 2 of power sense location pulling and running tool 100 can be subject to an anticlockwise moment of friction, control cam 2 and will be rotated counterclockwise an angle, the corners 23 controlling cam 2 is made to rotate in the slotted eye 14 of body 1, ensure this power sense location pulling and running tool 100 smooth under enter, as shown in Figure 6A, when power sense location pulling and running tool 100 is lowered into side-pocket mandrel 200 bottom, because radial space increases, control cam 2 and (rotate clockwise an angle by resetting under the effect of torsion spring 25, until the top portion 21 controlling cam 2 is resisted against the sidewall of trigger connecting column 32, it is stoped to continue to rotate clockwise), as shown in Figure 6B, on carry steel wire 9, control cam 2 in the pulling and running tool 100 of power sense location moves up along the gathering sill in side-pocket mandrel 200, when controlling to suffer restraints when cam 2 moves to gathering sill top, control cam 2 no longer to move up, steel wire 9 is carried on now continuing, when the power above carried is enough to the pressure of balance first stage clip (power induction spring) 4, steel wire 9 will drive steel wire head 91, trigger 3 and trigger rod 33 upward sliding, thus be pulled out from the perforation 51 of support arm 5 bottom of trigger rod 33, now be subject to the constraint of side-pocket mandrel 200 internal diameter, the support arm 5 of power sense location pulling and running tool 100 does not eject (opening), and power sense location pulling and running tool 100 is still in contraction state, as shown in Figure 6 C.Continuation is carried steel wire 9, when power sense location pulling and running tool 100, fishing joint 400 enter the eccentric part of side-pocket mandrel 200 completely, because radial space increases, promotion slide 7 moves downward by the second stage clip 8 in the pulling and running tool 100 of power sense location, support arm 5 is ejected, makes fishing joint 400 be positioned at the top of injection well downhole flow regulator 500; Transfer steel wire 9, fishing joint 400 will block the top of injection well downhole flow regulator 500, above carries steel wire 9, and power sense location pulling and running tool 100 will regain ground with fishing joint 400 and injection well downhole flow regulator 500, as shown in Figure 6 D.
From the above mentioned, power sense location of the present invention pulling and running tool, steel wire is utilized to carry out pulling, matched by the gathering sill that power responds to spring preset force, control cam and side-pocket mandrel, the requirement of the larger pulling power of large scale intelligent watering device needs can either be met, machinery accurately location can be realized again, pulling success rate can be increased substantially; Pulling and running tool is comparatively strong to surrounding environment compliance simultaneously, can realize accurate location under fouling, condition of shaking out.
The foregoing is only the schematic detailed description of the invention of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.
Claims (6)
1. a power sense location pulling and running tool, it is characterized in that: described pulling and running tool comprises the cylindrical tube of a upper end closed, the inside wall of described body is interval with the first flange, the second flange and the 3rd flange from top to bottom, body between described second flange with the 3rd flange is provided with through slotted eye on relative both sides tube wall, the control cam that one rotating shaft and body axis are serrated vertical is set in this slotted eye, rotating shaft is provided with the torsion spring leaning cam, this control cam is made up of four/three-arc shape disk body, and the top portion of formation control cam and terminal part, the arc diameter of described control cam is identical with the external diameter of body, control the terminal part of cam and be provided with the corners that a radial dimension is greater than circular arc radial dimension, the inner side end of described control cam is away from the fan-shaped stopper section of rotating shaft place projection one, described first flange inner arranges a cylindrical trigger slidably, this trigger lateral wall is provided with the edge clipping be arranged in above the second flange, the first stage clip is provided with between edge clipping and the first flange, one steel wire passes the blind end on described body top and is connected to trigger upper end, be provided with one below edge clipping and convexedly stretch in connecting column below the second flange, described connecting column sidewall and the top portion controlling cam against, tube wall below described body the 3rd flange is provided with the saturating groove that extends to body bottom, in body, a support arm and the connector hinged with support arm is provided with along this saturating groove, described support arm is articulated in body prejudicially, side, support arm top is set to circular arc, opposite side is set to inclined-plane, and support arm top center is provided with a perforation, between described support arm top and the 3rd flange, the sliding slide establishing to be provided with open-work, is provided with the second stage clip between slide and the 3rd flange, the connecting column of described trigger is fixed with a trigger rod, described trigger rod passes through the open-work of the 3rd flange and slide and is arranged in the perforation at support arm top.
2. power sense location as claimed in claim 1 pulling and running tool, is characterized in that: described body is linked in sequence by the first body, the second body and the 3rd body and forms; Described first body increases the weight of roofbolt by one of lower ending opening and forms, and this weighted lever post is axially arranged with can through the perforation of steel wire; Described first flange, the second flange, the 3rd flange and slotted eye are all arranged on the second body; Described groove is arranged on the 3rd body.
3. power sense location as claimed in claim 2 pulling and running tool, is characterized in that: described first flange is made up of the union connecting the first body and the second body; Described Bearing Angle is provided with one for the steel wire head of fixing steel wire.
4. power sense location as claimed in claim 1 pulling and running tool, is characterized in that: described support arm lower end is provided with the top supporting described connector top, and this top is provided with the inclined-plane of inclination; Described connector top is provided with and coordinates with described top the contact jaw contacted.
5. power sense location as claimed in claim 4 pulling and running tool, is characterized in that: be provided with the link connecting and throw in union and fishing joint bottom described connector.
6. power sense location as claimed in claim 1 pulling and running tool, is characterized in that: described control cam is axial double-decker, described two-layer between spacing be greater than the diameter of trigger rod and be less than the diameter of trigger connecting column; Described double-decker is connected as one by corners and fan-shaped stopper section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210539350.6A CN103015929B (en) | 2012-12-13 | 2012-12-13 | Casting-fishing tool with strength-sensing position |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210539350.6A CN103015929B (en) | 2012-12-13 | 2012-12-13 | Casting-fishing tool with strength-sensing position |
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| CN103015929A CN103015929A (en) | 2013-04-03 |
| CN103015929B true CN103015929B (en) | 2015-06-03 |
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| CN201210539350.6A Active CN103015929B (en) | 2012-12-13 | 2012-12-13 | Casting-fishing tool with strength-sensing position |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104563931B (en) * | 2013-10-27 | 2016-12-07 | 中国石油化工集团公司 | Enter under well-drilling borehole trajectory measurement instrument, reclaim tool kit |
| CN105298419A (en) * | 2015-09-23 | 2016-02-03 | 中国石油天然气股份有限公司 | Pulling and running device of solid anti-wax device for rodless lifting well and pulling and running technology thereof |
| CN105370222B (en) * | 2015-12-01 | 2017-09-01 | 中国石油天然气股份有限公司 | Drag for lance hydraulic eccentric centralizer |
| US20180230767A1 (en) * | 2017-02-16 | 2018-08-16 | Saudi Arabian Oil Company | Method and Apparatus for Reducing Downhole Losses in Drilling Operations, Sticking Prevention, and Hole Cleaning Enhancement |
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| US6216779B1 (en) * | 1997-12-17 | 2001-04-17 | Baker Hughes Incorporated | Downhole tool actuator |
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| CN102418485A (en) * | 2010-09-27 | 2012-04-18 | 中国石油天然气股份有限公司 | Positionable underground intelligent fishing tool |
| CN202531069U (en) * | 2012-03-22 | 2012-11-14 | 中国石油天然气股份有限公司 | Fixed-angle salvage device |
| CN203097771U (en) * | 2012-12-13 | 2013-07-31 | 中国石油天然气股份有限公司 | Force sensing positioning casting-fishing tool |
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| US6216779B1 (en) * | 1997-12-17 | 2001-04-17 | Baker Hughes Incorporated | Downhole tool actuator |
| CN201574708U (en) * | 2009-12-31 | 2010-09-08 | 贵州航天凯山石油仪器有限公司 | Executing device capable of realizing function of ascending and descending well repeatedly |
| CN201802374U (en) * | 2010-09-27 | 2011-04-20 | 中国石油天然气股份有限公司 | Working barrel for underground water distribution and monitoring |
| CN102418485A (en) * | 2010-09-27 | 2012-04-18 | 中国石油天然气股份有限公司 | Positionable underground intelligent fishing tool |
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| CN103015929A (en) | 2013-04-03 |
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