CN205445521U - Drag for expansion pipe subsidy instrument that expands integratively - Google Patents
Drag for expansion pipe subsidy instrument that expands integratively Download PDFInfo
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- CN205445521U CN205445521U CN201521132481.8U CN201521132481U CN205445521U CN 205445521 U CN205445521 U CN 205445521U CN 201521132481 U CN201521132481 U CN 201521132481U CN 205445521 U CN205445521 U CN 205445521U
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Abstract
The utility model provides a drag for expansion pipe subsidy instrument that expands integratively, it includes: hollow body, body include the first portion and the second portion of alternate segregation, it is stifled to locate this the internal inflation awl and the end, the first portion is located to the inflation awl, is equipped with the first portion of drawing of carrying on it, the stifled second portion of locating in the end is equipped with second cooperation portion on the end is stifled, this external expansion pipe is located to the cover, and it is connected with stifled can the dismantlement in the end, the inflation awl can expand the expansion pipe, set up in this internal body of rod, the body of rod is provided with first cooperation portion at inflation awl back to the stifled one side in the end, and first cooperation portion can carry that the portion of drawing cooperatees so that the awl led bar removal of personally experiencing sth. Part of the body of expand with first, the body of rod is provided with the second in the stifled one side of boring back to expanding in the end and carries the portion of drawing, and the second is carried and is drawn the portion to cooperate so that the body of rod salvage end is blocked up with second cooperation portion. The utility model discloses a mesh that can reduce the drag for expansion pipe subsidy instrument that expands integratively of the length of expansion pipe subsidy instrument is provided.
Description
Technical field
This utility model relates to expandable casing patching instrument, particularly relates to a kind of expandable casing patching instrument dragging for swollen one.
Background technology
It is mobile that expandable casing patching generally uses the related working string of hydraulic-driven expansion apparatus to produce in expansion tube, thus realize expansion tube and exceed elastic limit generation plastic deformation, expand into predetermined internal diameter and external diameter.Expansion tube emission cavity is in order to form confining pressure chamber, and bottom is usually plug and is connected with expansion tube by screw thread.After expandable casing patching operation completes, enter under needs milling tool drill the end block up.This technique enters working string twice under needing and just can fulfil assignment, and milling plug is the longest, requires to must be equipped with the power-equipments such as rotating disk to well head, brings great inconvenience to construction operation.
In prior art, generally use the expandable casing patching instrument dragging for swollen one disposably to complete expansion tube expansion and the end is blocked up and salvages two operations.But the expandable casing patching instrument dragging for swollen one of the prior art, generally bury in the oil pipe of expansion tube bottom by salvaging the pull bar blocked up at the end, a kind of expandable casing patching instrument dragging for swollen one as disclosed in Chinese utility model patent ZL201120111782.8, this allows for the expandable casing patching instrument dragging for swollen one of the prior art needs to form confining pressure chamber with expansion tube the bottom of oil pipe connection one and can bury the oil pipe of pull bar, thus add the length of whole expandable casing patching instrument, therefore it is not easy to operation, reduces work efficiency.
Utility model content
The purpose of this utility model is to provide the expandable casing patching instrument dragging for swollen one of a kind of length that can reduce expandable casing patching instrument.
Above-mentioned purpose of the present utility model can use following technical proposal to realize: a kind of expandable casing patching instrument dragging for swollen one, comprising: the body of hollow, described body includes Part I and the Part II being separated from each other；It is located at described intrinsic expansion cone and the end is blocked up；Described expansion cone is located at Part I, which is provided with the first pulling part；The described end, is blocked up and is located at described Part II, and the described end blocks and is provided with the second auxiliary section；Being sheathed on described external expansion tube, it blocks up with the described end and removably connects；Described expansion tube can be expanded by described expansion cone；It is arranged at the described intrinsic body of rod；The described body of rod is provided with the first auxiliary section in the side that described expansion cone is stifled back to the described end, and can match with described first pulling part in described first auxiliary section so that described expansion cone drives the described body of rod to move；At the described end, the stifled side back to described expansion cone is provided with the second pulling part to the described body of rod, can match with described second auxiliary section so that the described body of rod salvaging described end is blocked up in described second pulling part.
Preferably, the described body of rod has the extension extended from the end of described expansion tube to the direction away from described Part II, and described extension is provided with described first auxiliary section.
Preferably, described Part I is the first closure end back to one end of described Part II, described Part II is the second closure end back to one end of described Part I, it is provided with the first sealing member between described expansion cone and described expansion tube, between the stifled and described expansion tube in the described end, is provided with the second sealing member.
Preferably, described Part I is provided with suppresses through hole；Described through hole of suppressing can be connected with outside pressure device, internal to pressurize to described.
Preferably, described Part II is provided with inner lining body away from stifled one end, the described end, and described inner lining body has been radially arranged the first through hole；Described Part II is provided with the second through hole away from the stifled sidewall in the described end, and described inner lining body is fixed with described Part II by fixture, and when described inner lining body moves, described first through hole can be connected with described second through hole.
Preferably, the described body of rod is provided with the 3rd pulling part in the side that described inner lining body is stifled back to the described end, and described 3rd pulling part can lean, so that described inner lining body can be driven to move the end stifled back to the described end with described inner lining body.
Preferably, described first pulling part is that first arranged on the inwall of described expansion cone is protruding, and described first auxiliary section is that second arranged on the sidewall of the described body of rod is protruding.
Preferably, described second pulling part is that the 3rd arranged on the sidewall of the described body of rod is protruding, and described second auxiliary section is that the 4th arranged on the inwall blocked up at the described end is protruding.
Preferably, described Part I includes the connector that body is connected with described body；Expansion cone includes deviating from the cone seat that one end of described body is connected and the cone being arranged between described cone seat and described connector with described connector.
Preferably, described expansion tube is provided with groove on the inwall that the described end is blocked up, and the outer wall that the described end is stifled is provided with the resilient abutment claw stop at described expansion tube inwall, and described claw stop is fastened in described groove.
A kind of expandable casing patching instrument dragging for swollen one that this utility model provides provides the benefit that: this utility model is provided with the first auxiliary section by the body of rod in the side that expansion cone is stifled the end of back to, and can match with the first pulling part in this first auxiliary section so that expansion cone drives the body of rod to move；The end of at, the stifled side back to expansion cone is provided with the second pulling part to this body of rod, second pulling part can be matched so that the body of rod salvaging end is blocked up with the second auxiliary section, achieve when to the most internal suppressing, under the effect of hydraulic coupling, the Part I of body moves to the direction away from Part II, so that expansion cone moves, thus complete the expansion operation of expansion tube；When matching with the first auxiliary section on the body of rod in the first pulling part in expansion cone, expansion cone drives the body of rod to move, to complete to salvage the operation of the body of rod；Time matching in the second auxiliary section blocked the end of with when the second pulling part on the body of rod, blocked up by the body of rod salvaging end, thus it is stifled to complete to salvage the operation blocked up at the end, after expansion operation and fishing complete to salvage the end, down-hole only retains expansion tube, and owing to expansion cone is arranged at the Part I of body；The Part II being arranged at body is blocked up at the end；Expansion tube is sheathed on external；The body of rod is arranged at internal；Thus the body of rod is arranged at the inside of expansion tube, confining pressure chamber can be formed with expansion tube without connecting one in the bottom of oil pipe and the oil pipe of pull bar can be buried, thus decrease the length of expandable casing patching instrument, it is achieved thereby that this utility model provides the purpose of the expandable casing patching instrument dragging for swollen one of a kind of length that can reduce expandable casing patching instrument.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme in this utility model embodiment, in describing embodiment below, the required accompanying drawing used is briefly described, apparently, accompanying drawing in describing below is only embodiments more of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of expandable casing patching instrument of the present utility model.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.
Refer to Fig. 1.This utility model provides a kind of expandable casing patching instrument dragging for swollen one, comprising: the body 11 of hollow, described body 11 includes Part I 13 and the Part II 15 being separated from each other；It is located at the expansion cone 17 in described body 11 and the end blocks up 23；Described expansion cone 17 is located at Part I 13, which is provided with the first pulling part 47；The described end, is blocked up 23 and is located at described Part II 15, and the described end is blocked up 23 and is provided with the second auxiliary section 53；Being sheathed on the expansion tube 41 outside described body 11, it blocks up 23 with the described end and removably connects；Described expansion tube 41 can be expanded by described expansion cone 17；It is arranged at the body of rod 43 in described body 11；The side that the described body of rod 43 blocks up 23 in described expansion cone 17 back to the described end is provided with the first auxiliary section 51, can match with described first pulling part 47 so that described expansion cone 17 drives the described body of rod 43 to move in described first auxiliary section 51；The described body of rod 43 blocks up 23 and the side of described expansion cone 17 is provided with the second pulling part 49 at the described end, can match so that the described end salvaged by the described body of rod 43 blocks up 23 with described second auxiliary section 53 in described second pulling part 49.
The side that this utility model blocks up 23 by the body of rod 43 in expansion cone 17 end of back to is provided with the first auxiliary section 51, can match with the first pulling part 47 so that expansion cone 17 drives the body of rod 43 to move in this first auxiliary section 51；This body of rod 43 blocks up 23 and the side of expansion cone 17 is provided with the second pulling part 49 end of at, second pulling part 49 can be matched so that the end salvaged by the body of rod 43 blocks up 23 with the second auxiliary section 53, achieve when suppressing in body 11, under the effect of hydraulic coupling, the Part I 13 of body 11 moves to the direction away from Part II 15, so that expansion cone 17 moves, thus complete the expansion operation of expansion tube 41；When matching with the first auxiliary section 51 on the body of rod 43 in the first pulling part 47 in expansion cone 17, expansion cone 17 drives the body of rod 43 to move, to complete to salvage the operation of the body of rod 43；When the second pulling part 49 on the body of rod 43 block up the end of with the second auxiliary section 53 on 23 match time, salvage the end by the body of rod 43 and block up 23, thus salvage the end block up 23 with complete salvage the end block up 23 operation, after expansion operation and fishing complete, down-hole only retains expansion tube 41, and owing to expansion cone 17 is arranged at the Part I 13 of body 11；23 Part II 15 being arranged at body 11 are blocked up at the end；Expansion tube 41 is sheathed on outside body 11；The body of rod 43 is arranged in body 11；Thus the body of rod 43 is arranged at the inside of expansion tube 41, confining pressure chamber can be formed with expansion tube 41 without connecting one in the bottom of oil pipe and the oil pipe of pull bar can be buried, thus decrease expansion tube 41 and subsidize the length of instrument, it is achieved thereby that this utility model provides a kind of expansion tube 41 dragging for swollen one that can reduce the length that instrument subsidized by expansion tube 41 to subsidize the purpose of instrument.
As it is shown in figure 1, in the present embodiment, this utility model provides a kind of expandable casing patching instrument dragging for swollen one, comprising: the body 11 of hollow.Can disposably complete expansion tube 41 expansion by this body 11 and two operations of 23 salvaging are blocked up at the end, thus realize dragging for the purpose of swollen one.This body 11 includes Part I 13 and the Part II 15 being separated from each other, and this Part I 13 is provided with expansion cone 17, and this expansion cone 17 has the bulge 31 that the internal diameter of expansion tube 41 can be made to expand；Thus when Part I 13 is separated with Part II 15 under the effect of the pressure, expansion cone 17 can make expansion tube 41 expand by bulge 31.Part II 15 is provided with the end and blocks up 23；Such that it is able to drive expansion cone 17 to move to realize the purpose that expansion tube 41 expands by making Part I 13 and Part II 15 be separated.
As it is shown in figure 1, in the present embodiment, expansion tube 41 it is arranged with outside body 11；Expansion tube 41 and the end, blocked up 23 detachably connected, and this expansion tube can be expanded by expansion cone；Thus realize expansion tube and expand function.In the present embodiment, this expansion tube 41 is provided with groove 45 on the inwall that the end blocks up 23, the end, is blocked up and is provided with the resilient abutment claw stop 39 at expansion tube 41 inwall on the outer wall of 23, claw stop 39 is fastened in groove 45, when the end, being blocked up 23 applyings and making the active force that this claw stop 39 departs from this groove 45, this end, is blocked up 23 and can be disassembled from expansion tube 41, thus takes out this end and block up 23；Thus by this claw stop 39 realize this end block up 23 with expansion tube 41 block up the end of in the face of 23 the detachably connected purpose of inwall, in the present embodiment, this claw stop 39 is multiple and circumference is uniformly distributed in the end and blocks up 23 back on the sidewall of expansion cone 17.Thus the uniform force that the plurality of claw stop 39 can make the end block up 23.
As it is shown in figure 1, in the present embodiment, Part I 13 includes the connector 37 that body 35 is connected with body 35.This connected mode can be threaded, is beneficial to dismounting and installs, certainly such as can welding in the way of using other.Expansion cone 17 includes deviating from the cone seat 19 that one end of body 35 is connected and the cone 21 being arranged between cone seat 19 and connector 37 with connector 37.This connected mode is threaded, is beneficial to dismounting and installs, certainly such as can welding in the way of using other.First sealing member 27 is set between this cone seat 19 and expansion tube 41.
As it is shown in figure 1, in the present embodiment, expansion tube 41 has the different first paragraph of internal diameter 55 and second segment 57, and the internal diameter of this first paragraph 55 is less than the internal diameter of second segment 57.This cone 21 includes that external diameter is more than the bulge 31 of first paragraph 55 and the serrated end 33 of reduced diameter, thus when this cone 21 moves in first paragraph 55, this bulge 31 can make first paragraph 55 expand deformation.In the present embodiment, the external diameter of this bulge 31 is identical with the internal diameter of second segment 57, thus the internal diameter of first paragraph 55 can be made identical with the internal diameter of second segment 57 by this bulge 31.In the present embodiment, this first paragraph 55 is provided with the mesopore shoulder 59 of flaring to the crossover position of second segment 57, and this serrated end 33 can match with this mesopore shoulder 59, thus the beneficially bulge 31 expansion to first paragraph 55.
As it is shown in figure 1, in the present embodiment, Part I 13 is the first closure end 61 back to one end of Part II 15, and in the present embodiment, body 35 is connected with first joint 81 with closure end by connector 79；Part II 15 is the second closure end 63 back to one end of Part I 13, and in the present embodiment, this Part II 15 includes that the end is blocked up 23 and blocks up 23 second joints 83 with closure end being connected the end of with.The first sealing member 27 it is provided with between this expansion cone 17 and expansion tube 41, this end, is blocked up and is provided with the second sealing member 29 between 23 and expansion tube 41, thus formed in this body 11 and seal space, such that it is able to suppress in this sealing space, so that Part I 13 separates with Part II 15 under the effect of the pressure, in order to drive expansion cone 17 to move and realize the purpose that expansion tube 41 expands.In the present embodiment, this Part I 13 is provided with suppresses through hole 65；This is suppressed through hole 65 and can be connected, to pressurize in body 11 with outside pressure device.In the present embodiment, outside pressure device is hydraulic means such that it is able to suppresses through hole 65 by this and inputs highly pressurised liquid in sealing space so that Part I 13 can be separated with Part II 15 under the effect of hydraulic coupling.
As it is shown in figure 1, in the present embodiment, expansion cone 17 is provided with the first pulling part 47；It is thus possible to make the body of rod 43 lift out in body 11 by this first pulling part 47, thus salvage the body of rod 43.In the present embodiment, this first pulling part 47 is that first arranged on the inwall of expansion cone 17 is protruding.
As it is shown in figure 1, in the present embodiment, the body of rod 43 it is provided with in body 11；23 salvagings can be blocked up out in the end by this body of rod 43.The side that this body of rod 43 blocks up 23 in expansion cone 17 end of back to is provided with the first auxiliary section 51；Thus when matching with this first auxiliary section 51 in the first pulling part 47 in expansion cone 17, the body of rod 43 can be made to move by mobile expansion cone 17, thus by this body of rod 43 of salvaging.In the present embodiment, this first auxiliary section 51 is that second arranged on the sidewall of the body of rod 43 is protruding.Thus when first is protruding and the second projection abuts against, the body of rod 43 can be made to move by mobile expansion cone 17.This body of rod 43 has the extension extended from the end of expansion tube 41 to the direction away from Part II 15, the first auxiliary section 51 it is provided with on this extension, thus after expansion cone 17 only leaves expansion tube 41, the first pulling part 47 just can be made to lean with the first auxiliary section 51, it is thus possible to salvage the body of rod 43 after the expansion operation completing expansion tube 41, it is to avoid expand operation and be not fully complete the situation beginning to salvage.This body of rod 43 blocks up 23 and the side of expansion cone 17 is provided with the second pulling part 49 end of at；Thus 23 salvagings can be blocked up out in the end by this second pulling part 49.In present embodiment, this second pulling part 49 is that the 3rd arranged on the sidewall of the body of rod 43 is protruding.The end of the 3rd protruding body of rod 43 joint 67 for being connected back to one end of the first auxiliary section 51 with the body of rod 43.The side that the body of rod 43 blocks up 23 at inner lining body 71 end of back to is provided with the 3rd pulling part 69, and the 3rd pulling part 69 can be blocked up the end of 23 with inner lining body 71 and lean, so that inner lining body 71 can be driven to move the end of back to.In the present embodiment, the 3rd pulling part 69 is that the 5th arranged on the sidewall of the body of rod 43 joint 67 is protruding.
As it is shown in figure 1, in the present embodiment, the end, is blocked up and is provided with the second auxiliary section 53 on 23；Thus when matching with this second auxiliary section 53 in the second pulling part 49 on the body of rod 43, by the mobile body of rod 43, the active force that 23 applyings make claw stop 39 depart from groove 45 can be blocked up in the end, move so that the end blocks up 23, thus salvage this end and block up 23.It is protruding that the 4th arranged on the inwall of 23 is blocked up in this second auxiliary section 53 end of for, thus when the 5th protruding abut against with the 4th projection time, the end can be made to block up 23 by the mobile body of rod 43 and move.
As it is shown in figure 1, in the present embodiment, Part II 15 is provided with inner lining body 71 block up one end of 23 end of away from, and this inner lining body 71 has been radially arranged the first through hole 73；Part II 15 blocks up the end of away from and is provided with the second through hole 75 on the sidewall of 23, inner lining body 71 is fixed with Part II 15 by fixture 77, this fixture 77 will rupture under predetermined pulling force effect, when inner lining body 71 moves, first through hole 73 is connected with the second through hole 75, so that the pressure within body 11 balances each other with outside pressure, thus beneficially fishing.
This utility model provides a kind of expandable casing patching instrument dragging for swollen one, its operation principle is as follows: first, suppress in body 11 by suppressing through hole 65, thus the Part I 13 of body 11 moves to the direction deviating from Part II 15 under the effect of hydraulic coupling, thus expansion cone 17 makes expansion tube 41 expand；Secondly, when the first auxiliary section 51 that expansion cone 17 moves to its first pulling part 47 and the body of rod 43 leans, this first pulling part 47 applies to salvage the active force of the body of rod 43 to the first auxiliary section 51, so that the body of rod 43 moves, again, when second end, pulling part 49 of the body of rod 43 block up second auxiliary section 53 of 23 lean time, 23 applying active forces are blocked up at the end by this second pulling part 49, thus salvage the end and block up 23, lean when the 3rd pulling part on the body of rod 43 and inner lining body 71 block up the end of 23 end of back to, inner lining body 71 is driven to move, so that the first through hole 73 is connected with the second through hole 75, so that the pressure balance inside and outside body 11, complete expansion tube 41 to expand and salvage the body of rod 43 and the end and block up after the work of 23 completes, down-hole leaves behind expansion tube 41.
These are only several embodiment of the present utility model, those skilled in the art can carry out various change or modification without deviating from spirit and scope of the present utility model to this utility model embodiment according to application documents disclosure.
Claims (10)
1. the expandable casing patching instrument dragging for swollen one, it is characterised in that comprising:
The body of hollow, described body includes Part I and the Part II being separated from each other；
It is located at described intrinsic expansion cone and the end is blocked up；Described expansion cone is located at Part I, which is provided with the first pulling part；The described end, is blocked up and is located at described Part II, and the described end blocks and is provided with the second auxiliary section；
Being sheathed on described external expansion tube, it blocks up with the described end and removably connects；Described expansion tube can be expanded by described expansion cone；
It is arranged at the described intrinsic body of rod；The described body of rod is provided with the first auxiliary section in the side that described expansion cone is stifled back to the described end, and can match with described first pulling part in described first auxiliary section so that described expansion cone drives the described body of rod to move；At the described end, the stifled side back to described expansion cone is provided with the second pulling part to the described body of rod, can match with described second auxiliary section so that the described body of rod salvaging described end is blocked up in described second pulling part.
The expandable casing patching instrument dragging for swollen one the most according to claim 1, it is characterised in that: the described body of rod has the extension extended from the end of described expansion tube to the direction away from described Part II, and described extension is provided with described first auxiliary section.
The expandable casing patching instrument dragging for swollen one the most according to claim 1, it is characterized in that: described Part I is the first closure end back to one end of described Part II, described Part II is the second closure end back to one end of described Part I, it is provided with the first sealing member between described expansion cone and described expansion tube, between the stifled and described expansion tube in the described end, is provided with the second sealing member.
The expandable casing patching instrument dragging for swollen one the most according to claim 1, it is characterised in that: it is provided with on described Part I and suppresses through hole；Described through hole of suppressing can be connected with outside pressure device, internal to pressurize to described.
The expandable casing patching instrument dragging for swollen one the most according to claim 1, it is characterised in that: described Part II is provided with inner lining body away from stifled one end, the described end, and described inner lining body has been radially arranged the first through hole；Described Part II is provided with the second through hole away from the stifled sidewall in the described end, and described inner lining body is fixed with described Part II by fixture, and when described inner lining body moves, described first through hole can be connected with described second through hole.
The expandable casing patching instrument dragging for swollen one the most according to claim 5, it is characterized in that: the described body of rod is provided with the 3rd pulling part in the side that described inner lining body is stifled back to the described end, described 3rd pulling part can lean, so that described inner lining body can be driven to move the end stifled back to the described end with described inner lining body.
The expandable casing patching instrument dragging for swollen one the most according to claim 1, it is characterised in that: described first pulling part is that first arranged on the inwall of described expansion cone is protruding, and described first auxiliary section is that second arranged on the sidewall of the described body of rod is protruding.
The expandable casing patching instrument dragging for swollen one the most according to claim 1, it is characterised in that: described second pulling part is that the 3rd arranged on the sidewall of the described body of rod is protruding, and described second auxiliary section is that the 4th arranged on the inwall blocked up at the described end is protruding.
The expandable casing patching instrument dragging for swollen one the most according to claim 1, it is characterised in that: described Part I includes the connector that body is connected with described body；Expansion cone includes deviating from the cone seat that one end of described body is connected and the cone being arranged between described cone seat and described connector with described connector.
The expandable casing patching instrument dragging for swollen one the most according to claim 1, it is characterized in that: described expansion tube is provided with groove on the inwall that the described end is blocked up, being provided with the resilient abutment claw stop at described expansion tube inwall on the outer wall that the described end is stifled, described claw stop is fastened in described groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521132481.8U CN205445521U (en) | 2015-12-31 | 2015-12-31 | Drag for expansion pipe subsidy instrument that expands integratively |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521132481.8U CN205445521U (en) | 2015-12-31 | 2015-12-31 | Drag for expansion pipe subsidy instrument that expands integratively |
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| Publication Number | Publication Date |
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| CN205445521U true CN205445521U (en) | 2016-08-10 |
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| CN201521132481.8U Active CN205445521U (en) | 2015-12-31 | 2015-12-31 | Drag for expansion pipe subsidy instrument that expands integratively |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109681142A (en) * | 2018-12-13 | 2019-04-26 | 大港油田集团有限责任公司 | A kind of naked eye expansion device and application method |
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2015
- 2015-12-31 CN CN201521132481.8U patent/CN205445521U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109681142A (en) * | 2018-12-13 | 2019-04-26 | 大港油田集团有限责任公司 | A kind of naked eye expansion device and application method |
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