CN205025377U - Self -adaptation reducing sleeve pipe centralizer - Google Patents
Self -adaptation reducing sleeve pipe centralizer Download PDFInfo
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- CN205025377U CN205025377U CN201520678554.7U CN201520678554U CN205025377U CN 205025377 U CN205025377 U CN 205025377U CN 201520678554 U CN201520678554 U CN 201520678554U CN 205025377 U CN205025377 U CN 205025377U
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Abstract
The utility model provides a self -adaptation reducing sleeve pipe centralizer, its main part that includes the tubular structure is provided with toroidal cavity and rights the piece in the lateral wall of main part, still be provided with the outside passageway of lateral wall of intercommunication toroidal cavity and main part in the lateral wall of main part, and it is corresponding with the position of passageway to right the piece, be provided with the self -adaptation supporting mechanism in the toroidal cavity, the self -adaptation supporting mechanism can promote to right the radial position locking that to main part outside removal will right piece of piece along the main part. The utility model discloses to right the piece and hold in the inside of main part, not influence income ability under the sheathed tube, and can adapt to the well through rightting the length that the piece stretches out the main part, guarantee casing centralization.
Description
Technical field
The utility model relates to oil gas well cementing operation, completion technique field, particularly relates to a kind of self adaptation reducing casing tube centralizer.
Background technology
In shale gas exploitation, because horizontal well can link up more reservoir and crack, effectively can improve well yield, thus obtain and promote widely.Shale permeability is low, degree of porosity is little, borehole wall stability is bad, and therefore shale gas exploitation is normal adopts long bridge plug for horizontal well perforation staged fracturing technology.In bridge plug for horizontal well perforation staged fracturing process, if cementing quality is bad, easily causes fracturing fluid to alter groove, affect fracturing effect.And the major reason causing cementing quality bad to be drilling fluid not high.
To improve the standard one of effective ways of well cementing quality, that casing stabbing board by adding sufficient amount on sleeve pipe ensures casing centralization, but, can affect the setting ability of sleeve pipe at the casing stabbing board of jacket application dress, therefore prior art also starts to adopt diameter-changing centering guide to solve this problem.But the well in actual well drilled engineering also exists undergauge or expanding situation, the reducing rate of existing diameter-changing centering guide is fixing mostly, and the diameter-changing centering guide of fixing reducing rate cannot adapt to existing well.But, can affect sleeve pipe setting ability at jacket application dress conventional cannula centralizer, therefore the research and development of reducing casing tube centralizer emerge in an endless stream, but, well in actual well drilled engineering also exists undergauge or expanding situation, and the diameter-changing centering guide of fixing reducing rate cannot adapt to this operating mode.
Utility model content
For the problem of above-mentioned prior art, the purpose of this utility model proposes a kind of self adaptation reducing casing tube centralizer, ensures casing centralization, and do not affect the setting ability of sleeve pipe.
In order to achieve the above object, the utility model proposes a kind of self adaptation reducing casing tube centralizer, it comprises the main body of tubular structure, is provided with toroidal cavity and wiper block in the sidewall of main body, is also provided with the passage of the sidewall outside being communicated with toroidal cavity and main body in the sidewall of main body; Wiper block is corresponding with the position of passage, is provided with self adaptation supporting mechanism in toroidal cavity, and described self adaptation supporting mechanism can promote wiper block and move outside main body and by the locking position of wiper block along the radial direction of main body.
Along the circumference of main body, be evenly provided with multiple passage in the sidewall of main body, multiple wiper block and multiple passage one_to_one corresponding are arranged; The axis of main body is arranged in the horizontal direction, and passage is bar shaped, and the left surface of passage is inclined-plane, and the left surface of wiper block and the left surface of passage match; Described self adaptation supporting mechanism can promote wiper block synchronizing moving.
Wiper block is rigidity wiper block.
Described self adaptation supporting mechanism comprises back-up block and can promote the piston that move axially of back-up block along main body, back-up block is the block structure of the inner side being arranged at wiper block, piston coupling is arranged in toroidal cavity, and the axes coincide of the axis of piston and toroidal cavity; When under the effect of back-up block at piston along the moving axially of main body time, back-up block can promote wiper block and move outside main body along the radial direction of main body.
Wiper block and back-up block one_to_one corresponding are arranged, and the inner surface of wiper block is inclined-plane, and the external surface of back-up block is inclined-plane, and the inner surface of wiper block and the external surface of back-up block match.
Piston is tubular, is provided with hydraulic cavities between piston and the sidewall of main body, is provided with the hydraulic pressure hole of the inner chamber being communicated with hydraulic cavities and main body in the sidewall of main body.
Described self adaptation supporting mechanism also comprises closure, described closure can back-up block along during the moving axially of main body by the locking position of wiper block.
Described closure comprises pin thread and the box of the mutual grafting of energy, and piston, box are connected successively with pin thread, and pin thread is positioned at the inner side of wiper block, and back-up block is positioned at the outside of box.
Box comprises the sliding part be tightly connected with toroidal cavity, sliding part is annular, the axis of sliding part and the dead in line of main body, sliding part is arranged between piston and back-up block, sliding part abuts with piston, sliding part is provided with multiple sealed groove in strip, and back-up block is between adjacent two sealed grooves;
Pin thread comprises the fixed part be fixedly connected with main body, fixed part be annular, the axis of fixed part and the dead in line of sliding part, sliding part is provided with multiple grafting bar, grafting bar can with the grafting of sealed groove one_to_one corresponding;
Along the circumference of main body, the both sides of grafting bar are provided with broached-tooth design, the both sides of sealed groove are provided with broached-tooth design, when piston is along the moving axially of main body, box and back-up block are with piston moving axially together along main body, and the position of box realizes locking by the cooperation of the broached-tooth design of grafting bar and the broached-tooth design of sealed groove.
One end of main body is provided with box cupling, and the other end of main body is provided with joint, is provided with for the spacing elastic component of wiper block, the outer wall of main body is provided with eddy flow groove in toroidal cavity.
The beneficial effects of the utility model are, wiper block can be contained in the inside of main body, not affect the setting ability of sleeve pipe, and the length of stretching out main body by wiper block is to adapt to well, ensure casing centralization.
Accompanying drawing explanation
Fig. 1 is the structural representation of self adaptation reducing casing tube centralizer of the present utility model;
Fig. 2 is the sectional view along A-A line in Fig. 1;
Fig. 3 is the structural representation of main body of the present utility model;
Fig. 4 of the present utility modelly partly cuts open structural representation;
Fig. 5 is the connection diagram of box of the present utility model and pin thread;
Fig. 6 is the structural representation of box of the present utility model;
Fig. 7 is the structural representation of pin thread of the present utility model;
Description of reference numerals:
1. box cupling, 2. main body, 21. toroidal cavities, 22. passages, 3. hydraulic pressure hole, 4. hydraulic cavities, 5. piston, 6. box, 61. sliding parts, 62. sealed grooves, 7. eddy flow groove, 8. back-up block, 9. wiper block, 10. spring, 11. joints, 12. pin threads, 121. fixed parts, 122. grafting bars, 123. grooves.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present utility model, object and effect, now contrast accompanying drawing and detailed description of the invention of the present utility model is described.
As shown in Figure 1 to Figure 3, the utility model proposes a kind of self adaptation reducing casing tube centralizer, it comprises the main body 2 of tubular structure, toroidal cavity 21 and wiper block 9 is provided with in the sidewall of main body 2, also be provided with the passage 22 of the sidewall outside being communicated with toroidal cavity 21 and main body 2 in the sidewall of main body 2, wiper block 9 is corresponding with the position of passage 22; Be provided with self adaptation supporting mechanism in toroidal cavity 21, described self adaptation supporting mechanism can promote wiper block 9 and move outside main body 2 and by the locking position of wiper block 9 along the radial direction of main body 2.
Self adaptation reducing casing tube centralizer of the present utility model stretches out the sidewall of main body 2 by wiper block 9 and the borehole wall of contact producing well realizes sleeve pipe righting, compared with prior art: first, described self adaptation reducing casing tube centralizer arranges toroidal cavity 21 in the sidewall of main body 2, wiper block 9 is contained in the inside of main body 2, the external diameter of the reducing casing tube of self adaptation described in process centralizer is entered under reducing sleeve pipe, thus reduce the frictional resistance of sleeve pipe in the process, the setting ability of sleeve pipe is not had an impact, secondly, when carrying out casing centering, the external diameter of described self adaptation reducing casing tube centralizer depends on that wiper block 9 stretches out the length of the sidewall of main body 2, the length of stretching out when this length is the borehole wall of wiper block 9 contact producing well, therefore, the external diameter of described self adaptation reducing casing tube centralizer when righting can change according to borehole size (diameter of well), thus effectively improve the centralizer of sleeve pipe, such as running into undergauge, when the factors such as expanding or hole collapse cause borehole size to change, the length that wiper block 9 stretches out the sidewall of main body 2 can match with borehole size, the utility model still can play good righting performance, moreover, when wiper block 9 contact is to the borehole wall of producing well, described self adaptation supporting mechanism can carry out position that is effectively spacing, locking wiper block 9 to wiper block 9, therefore, wiper block 9 can stretch out the sidewall of main body 2 to greatest extent, improve overall righting effect, particularly sleeve outer and hole diameter gap larger time, advantage of the present utility model can be highlighted better.It can thus be appreciated that the utility model structure is simple, and can be applicable to various Oil/gas Well well type, can significantly improve cementing quality, keep wellbore stability, improve Oil/gas Well output.
In order to improve centralizer during casing centering further, in a feasible embodiment, be provided with multiple passage 22 uniform along the circumference of main body 2 in the sidewall of main body 2, multiple wiper blocks 9 are arranged with multiple passage 22 one_to_one corresponding; The axis of main body 2 is arranged in the horizontal direction, passage 22 is in bar shaped, the left surface of passage 22 is inclined-plane, the left surface of wiper block 9 and the left surface of passage 22 match, so that described self adaptation supporting mechanism can promote multiple wiper block 9 synchronizing moving when (being the right side in figure) forward along the axis of main body 2 and moving.Particularly when being applied to shale gas long horizontal sections, the consumption of described self adaptation reducing casing tube centralizer can be reduced, obviously reducing well cementation cost.Through experimental verification, compared with existing conventional centralizer, the utility model can make drilling fluid improve more than 80%, can significantly improve horizontal cementing quality.In the specific embodiment of as shown in Figure 2, main body 2 is provided with 6 passages 22 altogether, the left surface of passage 22 is the inclined-plane tilted from inside to outside to the right along the radial direction of main body 2,6 wiper blocks 9 are arranged at 6 passages 22 respectively, 6 wiper blocks 9 can under the promotion of described self adaptation supporting mechanism, and the sidewall outside synchronously to main body 2 is mobile.
As shown in Figure 1, described self adaptation supporting mechanism comprises back-up block 8 and can promote the piston 5 that move axially of back-up block 8 along main body 2, back-up block 8 is for being arranged at the block structure of the inner side of wiper block 9, and the inner side of wiper block 9 is the side of wiper block 9 near the axis of main body 2.Main body 2 is for can split structure, and when main body 2 splits, toroidal cavity 21 is opened, and after described self adaptation supporting mechanism receives into toroidal cavity 21, then assembles as a whole by main body 2, and toroidal cavity 21 closes; Piston 5 coupling is arranged in toroidal cavity 21, and the axes coincide of the axis of piston 5 and toroidal cavity 21; When back-up block 8 under the effect of piston 5 along the moving axially of main body 2 time, back-up block 8 can be promoted wiper block 9 and be moved outside main body 2 by passage 22.Particularly when arranging multiple wiper block 9, piston 5 evenly can exert a force to back-up block 8, and each back-up block 8 is substantially equal for the thrust of each wiper block 9, and wiper block 9 can synchronously be moved outside the sidewall of main body 2.
Particularly, wiper block 9 and back-up block 8 one_to_one corresponding are arranged, the inner surface of wiper block 9 is inclined-plane, the external surface of back-up block 8 is inclined-plane, the inner surface of wiper block 9 and the external surface of back-up block 8 match, be beneficial to back-up block 8 and promote wiper block 9, the right-hand member of back-up block 8 is between the left end and the inwall of toroidal cavity 21 of wiper block 9.Wherein, the inner surface of wiper block 9 refers to the side of the wiper block 9 of the inwall of adjacent rings cavity 21, the inner surface of wiper block 9 is from left to right towards the inclined-plane of the inclined of main body 2, the external surface of back-up block 8 refers to the side of the back-up block 8 away from the inwall of toroidal cavity 21, and the incline direction of the external surface of back-up block 8 is identical with the incline direction of the inner surface of wiper block 9; The inwall of toroidal cavity 21 refers to the ring wall surface of the central axis of the contiguous main body 2 of toroidal cavity 21, and the outer wall of toroidal cavity 21 refers to the ring wall surface of toroidal cavity 21 away from the central axis of main body 2.The external surface of wiper block 9 can be arcwall face, and as shown in Figure 2, the external surface of wiper block 9 is the side of the outer wall of the contiguous main body 2 of wiper block 9, and the radian of described arcwall face is identical with the radian of the outer wall of main body 2.The external surface of wiper block 9 can also be plane or other be suitable for practical shape.
In the embodiment of such as shown in Fig. 1 and Fig. 4, piston 5 is closed and the tubular construction of left end open for right-hand member, the right-hand member of piston 5 is provided with centre bore, the centre bore of piston 5 is connected with the inner wall sealing of toroidal cavity 21, the outer wall of piston 5 and the outer wall of toroidal cavity 21 are tightly connected, thus hydraulic cavities 4 is formed between piston 5 and the sidewall of main body 2, and in the sidewall of main body 2, be provided with the hydraulic pressure hole 3 of the inner chamber being communicated with hydraulic cavities 4 and main body 2, so that when injecting liquid in sleeve pipe, liquid energy self-hydraulic hole 3 in sleeve pipe enters hydraulic cavities 4, and promote piston 5 and move forward along the axis of main body 2.In order to make piston 5 uniform force, number can be set according to wiper block 9,3 to 6 hydraulic pressure holes 3 are evenly set on the body 2.
In order to avoid wiper block 9 is after righting, particularly after well cementation and well completion work terminate, the distortion caused because the pressure born is excessive or the working time is longer and undergauge, wiper block 9 adopts rigidity wiper block.
In a feasible embodiment, described self adaptation supporting mechanism also comprises closure, described closure can back-up block 8 along during the moving axially of main body 2 by the locking position of wiper block 9, so that after wiper block 9 righting, carry out effectively spacing to back-up block 8 and wiper block 9, prevent from producing between wiper block 9 and the borehole wall of producing well sliding, meanwhile, the supporting role of back-up block 8 pairs of wiper blocks 9 can be guaranteed.
In a specific embodiment, described closure comprises pin thread 12 and the box 6 of the mutual grafting of energy, and piston 5, box 6 are connected successively with pin thread 12, and pin thread 12 is positioned at the inner side of wiper block 9, and back-up block 8 is positioned at the outside of box 6.That is, in toroidal cavity 21, wiper block 9 and back-up block 8 are positioned at the position of the axis away from main body 2, and pin thread 12 and box 8 are positioned at the position of the axis near main body 2, as shown in Figure 2.Wherein:
As shown in Figures 5 and 6, box 6 comprises the sliding part 61 be tightly connected with toroidal cavity 21, sliding part 61 is annular, the axis of sliding part 61 and the dead in line of main body 2, sliding part 61 is arranged between piston 5 and back-up block 8, sliding part 61 abuts with piston 5, and sliding part 61 is provided with multiple sealed groove 62 in strip, and back-up block 8 is between adjacent two sealed grooves 62; Sliding part 61 can be tightly connected by sealing mat and toroidal cavity 21;
As shown in Figure 5 and 7, pin thread 12 comprises the fixed part 121 be fixedly connected with main body 2, and fixed part 121 is annular, the axis of fixed part 121 and the dead in line of sliding part 61, sliding part 61 is provided with multiple grafting bar 122, grafting bar 122 can with the grafting of sealed groove 62 one_to_one corresponding;
As shown in Figures 4 and 5, along the circumference of main body 2, the both sides of grafting bar 122 are provided with broached-tooth design, the upper and lower both sides of the grafting bar 122 namely shown in figure are provided with broached-tooth design, the both sides of sealed groove 62 are provided with broached-tooth design, the upper and lower both sides of the sealed groove 62 namely shown in figure are provided with broached-tooth design, when piston 5 is along the moving axially of main body 2, box 6 and back-up block 8 are with piston 5 moving axially together along main body 2, and the position of box 6 realizes locking by the cooperation of the broached-tooth design of grafting bar 122 and the broached-tooth design of sealed groove 62.
The embodiment that described closure comprises two pin threads 12 and two boxes 6 is illustrate only in figure, needed for production, multiple boxes 6 that described closure can also comprise multiple pin thread 12 and match with pin thread 12.
In specific embodiment as shown in Figure 1, pin thread 12 is fixedly installed on the right flank of toroidal cavity 21, for the ease of the movement of wiper block 9, the side arranging grafting bar 122 at fixed part 121 is also provided with the groove 123 matched with wiper block 9, and groove 123 is identical with the incline direction of the incline direction of the side that wiper block 9 matches and the right flank of wiper block 9.
For the ease of being connected with sleeve pipe, one end of main body 2 is provided with box cupling 1, and the other end of main body 2 is provided with joint 11.The elastic component be provided with in toroidal cavity 21 for wiper block 9 is spacing is outside to prevent wiper block 9 from falling to passage 22, is specially the spring 10 be connected between wiper block 9 and the inwall of toroidal cavity 21.And, the outer wall of main body 2 is also provided with eddy flow groove 7, the displacement efficiency of cement paste can be improved, effectively improve cementing quality.
Illustrate the course of work of the present utility model below.
Described self adaptation reducing casing tube centralizer is connected between two adjacent well cementing casing pipes, then, the thimble assembly after connecting is lowered into the position designed in advance.Under entered after, to injecting liquid in sleeve pipe and building the pressure, piston 5 moves right along the axis of main body 2, and drives the sliding part 61 of box 6 to move right together with back-up block 8.Period, the sealed groove 62 of box 6 is along grafting bar 122 right lateral, and back-up block 8 right lateral also promotes wiper block 9 and moves to the outside of main body 2, until wiper block 9 cannot move against the borehole wall to producing well, the length that wiper block 9 stretches out the sidewall of main body 2 no longer changes.Now, the righting of described self adaptation reducing casing tube centralizer completes, and unloads the hydraulic pressure in Decanning.After losing support, the sealed groove 62 of box 6 engages each other with the grafting bar 122 of pin thread 12, and wiper block 9 is fixed.
The foregoing is only the schematic detailed description of the invention of the utility model, and be not used to limit scope of the present utility model.Any those skilled in the art, the equivalent variations done under the prerequisite not departing from design of the present utility model and principle and amendment, all should belong to the scope of the utility model protection.And it should be noted that, each ingredient of the present utility model is not limited in above-mentioned overall applicability, the each technical characteristic described in manual of the present utility model can select one to adopt separately or select the multinomial use that combines according to actual needs, therefore, the utility model naturally covers other relevant with this case innovative point and combines and embody rule.
Claims (10)
1. a self adaptation reducing casing tube centralizer, it is characterized in that, described self adaptation reducing casing tube centralizer comprises the main body (2) of tubular structure, toroidal cavity (21) and wiper block (9) is provided with in the sidewall of main body (2), also be provided with the passage (22) of the sidewall outside being communicated with toroidal cavity (21) and main body (2) in the sidewall of main body (2), wiper block (9) is corresponding with the position of passage (22); Toroidal cavity is provided with self adaptation supporting mechanism in (21), and described self adaptation supporting mechanism can promote wiper block (9) and to move outward along the radial direction of main body (2) to main body (2) and by the locking position of wiper block (9).
2. self adaptation reducing casing tube centralizer as claimed in claim 1, it is characterized in that, along the circumference of main body (2), evenly be provided with multiple passage (22) in the sidewall of main body (2), multiple wiper block (9) and multiple passage (22) one_to_one corresponding are arranged; The axis of main body (2) is arranged in the horizontal direction, and passage (22) is in bar shaped, and the left surface of passage (22) is inclined-plane, and the left surface of wiper block (9) and the left surface of passage (22) match; Described self adaptation supporting mechanism can promote wiper block (9) synchronizing moving.
3. self adaptation reducing casing tube centralizer as claimed in claim 1 or 2, it is characterized in that, wiper block (9) is rigidity wiper block.
4. self adaptation reducing casing tube centralizer as claimed in claim 1, it is characterized in that, described self adaptation supporting mechanism comprises back-up block (8) and can promote the piston (5) that move axially of back-up block (8) along main body (2), back-up block (8) is for being arranged at the block structure of the inner side of wiper block (9), piston (5) coupling is arranged in toroidal cavity (21), and the axes coincide of the axis of piston (5) and toroidal cavity (21); When back-up block (8) under the effect of piston (5) along the moving axially of main body (2) time, back-up block (8) can promote the radial direction of wiper block (9) along main body (2) to main body (2) outer movement.
5. self adaptation reducing casing tube centralizer as claimed in claim 4, it is characterized in that, wiper block (9) and back-up block (8) one_to_one corresponding are arranged, the inner surface of wiper block (9) is inclined-plane, the external surface of back-up block (8) is inclined-plane, and the inner surface of wiper block (9) and the external surface of back-up block (8) match.
6. self adaptation reducing casing tube centralizer as claimed in claim 4, it is characterized in that, piston (5) is tubular, be provided with hydraulic cavities (4) between the sidewall of piston (5) and main body (2), in the sidewall of main body (2), be provided with the hydraulic pressure hole (3) of the inner chamber being communicated with hydraulic cavities (4) and main body (2).
7. self adaptation reducing casing tube centralizer as claimed in claim 6, it is characterized in that, described self adaptation supporting mechanism also comprises closure, described closure can back-up block (8) along during the moving axially of main body (2) by the locking position of wiper block (9).
8. self adaptation reducing casing tube centralizer as claimed in claim 7, it is characterized in that, described closure comprises pin thread (12) and the box (6) of the mutual grafting of energy, piston (5), box (6) are connected successively with pin thread (12), pin thread (12) is positioned at the inner side of wiper block (9), and back-up block (8) is positioned at the outside of box (6).
9. self adaptation reducing casing tube centralizer as claimed in claim 8, it is characterized in that, box (6) comprises the sliding part (61) be tightly connected with toroidal cavity (21), sliding part (61) is annular, the axis of sliding part (61) and the dead in line of main body (2), sliding part (61) is arranged between piston (5) and back-up block (8), sliding part (61) abuts with piston (5), sliding part (61) is provided with multiple sealed groove (62) in strip, back-up block (8) is positioned between two adjacent sealed grooves (62),
Pin thread (12) comprises the fixed part (121) be fixedly connected with main body (2), fixed part (121) is annular, the axis of fixed part (121) and the dead in line of sliding part (61), sliding part (61) is provided with multiple grafting bar (122), grafting bar (122) can with sealed groove (62) one_to_one corresponding grafting;
Along the circumference of main body (2), the both sides of grafting bar (122) are provided with broached-tooth design, the both sides of sealed groove (62) are provided with broached-tooth design, when piston (5) is along the moving axially of main body (2), box (6) and back-up block (8) are with piston (5) moving axially together along main body (2), and the position of box (6) realizes locking by the cooperation of the broached-tooth design of grafting bar (122) and the broached-tooth design of sealed groove (62).
10. self adaptation reducing casing tube centralizer as claimed in claim 1, it is characterized in that, one end of main body (2) is provided with box cupling (1), the other end of main body (2) is provided with joint (11), be provided with in toroidal cavity (21) for the spacing elastic component of wiper block (9), the outer wall of main body (2) be provided with eddy flow groove (7).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520678554.7U CN205025377U (en) | 2015-09-02 | 2015-09-02 | Self -adaptation reducing sleeve pipe centralizer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520678554.7U CN205025377U (en) | 2015-09-02 | 2015-09-02 | Self -adaptation reducing sleeve pipe centralizer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108843274A (en) * | 2018-06-28 | 2018-11-20 | 东北石油大学 | Water-jet spinning drag bit and carbon dioxide injection well de-plugging process |
| CN114278236A (en) * | 2021-12-24 | 2022-04-05 | 通化红光石油机械有限责任公司 | Casing centralizing and patching device |
| CN114484102A (en) * | 2022-04-14 | 2022-05-13 | 东营汇阅信息科技有限公司 | Reducing oil pipe coupling |
-
2015
- 2015-09-02 CN CN201520678554.7U patent/CN205025377U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108843274A (en) * | 2018-06-28 | 2018-11-20 | 东北石油大学 | Water-jet spinning drag bit and carbon dioxide injection well de-plugging process |
| CN114278236A (en) * | 2021-12-24 | 2022-04-05 | 通化红光石油机械有限责任公司 | Casing centralizing and patching device |
| CN114484102A (en) * | 2022-04-14 | 2022-05-13 | 东营汇阅信息科技有限公司 | Reducing oil pipe coupling |
| CN114484102B (en) * | 2022-04-14 | 2022-09-23 | 东营市科创石油装备有限公司 | Reducing oil pipe coupling |
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