CN204532230U - The protective device of packing element - Google Patents
The protective device of packing element Download PDFInfo
- Publication number
- CN204532230U CN204532230U CN201520043370.3U CN201520043370U CN204532230U CN 204532230 U CN204532230 U CN 204532230U CN 201520043370 U CN201520043370 U CN 201520043370U CN 204532230 U CN204532230 U CN 204532230U
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- packing element
- conical surface
- noumenon
- lug boss
- protective device
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- 238000012856 packing Methods 0.000 title claims abstract description 85
- 230000001681 protective effect Effects 0.000 title claims abstract description 48
- 230000008859 change Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000000638 stimulation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
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- 239000004576 sand Substances 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
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Abstract
The utility model discloses a kind of protective device of packing element, it comprises: the first noumenon, the outer wall of the first noumenon comprise there is first conical surface the first lug boss, contact part and the first holding section, the second body that the relative the first noumenon of energy slides, it comprises multiple the second body unit around the arrangement of center line circumferencial direction, each second body unit comprises the second lug boss and the second holding section, second lug boss has second conical surface corresponding with first conical surface, when relative second body of the first noumenon slides, second conical surface of the second body can along first conical surface of the first noumenon towards moving radially away from center line, so that the second holding section of the second body and the first holding section phase clamping of the first noumenon, second lug boss can offset with contact part, the outer wall of the second body forms ringwise limited impression, elastic collar is provided with in limited impression.The utility model structure is simple, and effectively prevents packing element from producing stream change, improves the bearing capacity of packer.
Description
Technical field
The utility model relate to the kit in a kind of packer, particularly a kind of protective device of packing element.
Background technology
Along with the fast development of national economy, the demand of the primary energy such as petroleum gas is constantly increased.The Global Oil and Gas Resources exploitation unconventionaloil pool that focus turns to hyposmosis gradually, difficulty is employed is hidden, and comprises tight sand oil-gas reservoir, shale oil gas reservoir, coal bed gas etc.The unconventional resource being considered to not have exploitation economic worth in the past has obtained large-scale commercial applications exploitation now, meets growing energy demand, obtains considerable economic benefit, the shale gas exploitation of such as north America region.This mainly has benefited from the progress of technology, and especially the sizable application of horizontal well in segments stimulation technology, greatly reduces development cost, improves well yield, extends stable production period.High pressure resistant external packer of pipe in horizontal well in segments stimulation technology kit is one of important instrument, and the indexs such as its withstand voltage properties, reliability, working life, cost have a significant impact reservoir reconstruction effect and oil gas field recovery ratio.But such packer, in real work, usually just often can lose efficacy, and find that packing element remains intact substantially after being tripped out by packer after setting a period of time.This is mainly caused by the contact stress between packing element and sleeve pipe declines.In order to prevent packing element contact stress from declining, guaranteeing that packing element sealing is permanently effective, just needing preferably protective device to give supporting.
At present, the existing multinomial patent about improving packer bearing capacity, wherein, in Chinese patent storehouse, application number is 201120311923.0 describe a kind of protection structure of rubber drum of packer, and it comprises: packing element, and the end of packing element has the external surface of taper; Packing element protection assembly, is set in the end of packing element; Axially stop block, along the axis of packing element and packing element end abutment and be fixed on oil pipe, packing element is protected assembly along the axial limiting of packing element on packing element by axially stop block; Wherein, packing element protection assembly comprises: the pedestal of tubular, and fixing is enclosed within axially stop block; Metal profile, metal profile is hinged on pedestal that one end near the end of packing element, and metal profile has the inner surface of conical ring; First collar, has the first conical ring be enclosed within the inner surface of metal profile; Second collar, the second conical ring between the external surface with the taper being set in the inner surface of first collar and the end of packing element.The sandwich design that protection structure of rubber drum of packer in this application adopts soft or hard to combine, effectively can improve the sealing performance of packer, prevent packing element to be extruded when operation.But the soft or hard integrated structure in this protection structure of rubber drum of packer is complicated, design difficulty is large, and execute-in-place technology difficulty is large.
Utility model content
In order to overcome the above-mentioned defect of prior art, technical problem to be solved in the utility model there is provided a kind of protective device of packing element, and it can solve the protective device complex structure of prior art, problem that execute-in-place difficulty is large.
Concrete technical scheme of the present utility model is:
A protective device for packing element, is characterized in that, it comprises: have a center line and the first noumenon cylindrically, the outer wall of described the first noumenon comprise there is first conical surface the first lug boss, contact part and the first holding section, can relatively described the first noumenon centrally line direction slide the second body, it comprises multiple the second body unit around the arrangement of center line circumferencial direction, each second body unit comprises the second lug boss and the second holding section, described second lug boss has second conical surface corresponding with described first conical surface, when relatively described second body of described the first noumenon slides, second conical surface of described second body can along first conical surface of described the first noumenon towards moving radially away from described center line, so that the second holding section of described second body and the first holding section phase clamping of described the first noumenon, described second lug boss can offset with described contact part, the outer wall of described second body forms ringwise limited impression, elastic collar is provided with in described limited impression.
Preferably, described limited impression is two, and two described limited impressions lay respectively at the two ends of described second body outer wall, is equipped with for by described elastic collar fastening for described second body unit in each described limited impression.
Preferably, described contact part has having three pyramidal faces, and described second body unit also comprises the 3rd lug boss, and described 3rd lug boss comprises four conical surface corresponding with described having three pyramidal faces.
Preferably, described first holding section comprises the first engaging place and the second engaging place, and described first engaging place is positioned at the outer rim of described first lug boss, and described second engaging place is positioned at the outer rim of described contact part.
Preferably, described first engaging place and described second engaging place are in shoulder shape.
Preferably, described second holding section comprises the 3rd engaging place and the 4th engaging place, and described 3rd engaging place is positioned at the inner edge of described second lug boss, and described 4th engaging place is positioned at the inner edge of described 3rd lug boss.
Preferably, described 3rd engaging place and described 4th engaging place are in shoulder shape.
Preferably, the angle of described first conical surface, described having three pyramidal faces, described second conical surface, described 4th conical surface and described center line is 30 degree.
Preferably, described elastic collar is made up of rubber.
A kind of packer, it is characterized in that, it comprises the protective device of packing element described above.
The utility model has following remarkable beneficial effect:
First conical surface, having three pyramidal faces, second conical surface and the 4th conical surface in the protective device of 1, packing element are conducive to the second body by even distending; after the first noumenon is subject to axially loaded; through multiple conical surface, axial force is converted into radial load, by stable for the piecemeal of the second body radially even distending.
2, the second body of the protective device of packing element is rigidity; it is conducive to the righting of packer and the bearing capacity of packing element; larger plastic strain can not be there is when the second body distending of rigidity; second body opens uniformly and plays certain centralizing function between two parties to packer; simultaneously the gap that produces after expanding of the second body is less; and it is to radial dilatation; the annular space space reducing or be filled with between packer and sleeve pipe; prevent from packing element from producing stream when pressure is higher to become, improve the bearing capacity of packer.
3, the first holding section of the protective device of packing element and the second holding section are of value to the bearing capacity improving packer further.After clamping is docked in first holding section and the second holding section, when packing element is stressed, the effect of rigidity protrusion-dispelling is played to it, and form maximum protection radius in clamping position, improve the bearing capacity of whole packer.
Accompanying drawing explanation
Accompanying drawing described here only for task of explanation, and is not intended to limit the utility model scope of disclosure by any way.In addition, the shape of each parts in figure and proportional sizes etc. are only schematic, for helping understanding of the present utility model, are not the shape and the proportional sizes that specifically limit each parts of the utility model.Those skilled in the art, under instruction of the present utility model, can select various possible shape and proportional sizes to implement the utility model as the case may be.
Fig. 1 is the main TV structure schematic diagram of the protective device of packing element of the present utility model.
Fig. 2 is the schematic diagram of the protective device cross section of packing element of the present utility model.
Fig. 3 is the packer construction schematic diagram of the protective device that packing element of the present utility model is housed.
Fig. 4 is the structural representation after the protective device of packing element of the present utility model slides.
The Reference numeral of above accompanying drawing: 1, the first noumenon; 11, the first lug boss; 111, first conical surface; 12, contact part; 13, the first engaging place; 14, the second engaging place; 121, having three pyramidal faces; 2, elastic collar; 3, the second body; 31, the second lug boss; 311, second conical surface; 312, the 3rd engaging place; 32, the 3rd lug boss; 321, the 4th conical surface; 33, limited impression; 34, the 4th engaging place; 4, central tube; 5, spacer ring; 6, packing element.
Detailed description of the invention
By reference to the accompanying drawings with the description of the utility model detailed description of the invention, can clearly understand details of the present utility model.But detailed description of the invention of the present utility model described here, only for explaining the purpose of this utility model, and can not to be understood as by any way be to restriction of the present utility model.Under instruction of the present utility model, technician can conceive based on distortion possible arbitrarily of the present utility model, and these all should be regarded as belonging to scope of the present utility model.
A protective device for packing element, it comprises: have a center line and the first noumenon 1 cylindrically, the outer wall of the first noumenon comprise there is first conical surface 111 the first lug boss 11, contact part 12 and the first holding section, can relative the first noumenon 1 centrally the second body 3 of sliding of line direction, it comprises multiple the second body unit around the arrangement of center line circumferencial direction, each second body unit comprises the second lug boss 31 and the second holding section 14, second lug boss 31 has second conical surface 311 corresponding with first conical surface 111, when relative second body 3 of the first noumenon 1 slides, second conical surface 311 of the second body 3 can along first conical surface 111 of described the first noumenon 1 towards moving radially away from center line, so that the second holding section of the second body 3 and the first holding section phase clamping of the first noumenon 1, second lug boss 31 can offset with contact part 12, the outer wall of the second body 3 forms ringwise limited impression 33, elastic collar 2 is provided with in limited impression 33.
Fig. 1 is the main TV structure schematic diagram of the protective device of packing element of the present utility model, and as shown in Figure 1, the protective device of packing element comprises the first noumenon 1 and the second body 3 with a center line.This first noumenon 1 roughly cylindrically, it has two ends, left and right, the outer wall of the first noumenon 1 has the contact part 12 towards the first lug boss 11 given prominence to away from centerline direction and annular of annular, contact part 12 is convex, its cross section is roughly in trapezoidal, the right flank of the first lug boss 11 is first conical surface 111, the first noumenon 1 also comprises the first holding section, first holding section comprises the first engaging place 13, first engaging place 13 is positioned at the top of the first lug boss 11, and the first engaging place 13 is in shoulder shape and annular is arranged at the first noumenon 1.Owing to the first noumenon 1 being provided with the first lug boss 11 and contact part 12, form a recess between the two.Roughly cylindrically, it has two ends, left and right to second body 3.Second body 3 is set in the outside of the first noumenon 1, second body 3 comprises multiple the second body unit around the arrangement of center line circumferencial direction, each second body unit comprises towards the second lug boss 31 given prominence near centerline direction, second lug boss 31 is positioned at the left end of the second body 3, second lug boss 31 is roughly tapered, and its left surface is second conical surface 311.The outer wall of the second body 3 has the limited impression 33 of annular, in limited impression 33, is provided with elastic collar 2, the second body unit by the elastic collar 2 that arranges in limited impression 33 by its fastening be one overallly form the second body 3.Second body 3 also comprises the second holding section, and the second holding section comprises the inner edge that the 3rd engaging place the 312, three engaging place 312 is positioned at the second lug boss 31, and both are all in shoulder shape and annular is arranged at the second body 3 inwall.First conical surface 111 on the first noumenon 1 and second conical surface 311 of the second body 3 match, be specially, contact part 12 and the second lug boss 31 inconsistent time, i.e. first conical surface 111 and the inconsistent cooperation of second conical surface 311, because first conical surface 111 and second conical surface 311 are the conical surface, the first noumenon 1 and the second body 3 can slide.Fig. 4 is the structural representation after the protective device of packing element of the present utility model slides; as shown in Figure 4; after the first noumenon 1 and the second body 3 slide; because the second body 3 is made up of multiple second body unit; tightened together by elastic collar 2; second body 3 can strut elastic collar 2, in radial direction, skew expansion occur; when slip arrives to a certain degree; first engaging place 13 of shoulder shape engages with the 3rd locates 312 phase clampings, stops the first noumenon 1 and the second body 3 to continue to slide.By sliding, the first noumenon 1 and the second body 3 radius of protection are diametrically increased, and two ends, left and right have access section respectively, effectively prevent the operational failure of the protective device of packing element.
Operating principle of the present utility model is as follows:
Fig. 3 is the packer construction schematic diagram of the protective device that packing element of the present utility model is housed; as shown in Figure 3; packing element 6 is sheathed on outside central tube 4; be respectively arranged with the protective device of packing element at the two ends, left and right of packing element 6, between packing element 6 and the protective device of packing element, be provided with spacer ring 5.
In an initial condition, first conical surface 111 of the first noumenon 1 and second conical surface 311 of the second body 3 inconsistent.To enter to appointment well section under above-mentioned packer, make the first noumenon 1 stressed by machinery or hydraulic action, after pressure acquires a certain degree, first conical surface 111 of the first noumenon 1 slides along second conical surface 311 of the second body 3, second body unit is owing to overcoming the binding force of elastic collar 2 after being subject to radial load, radially slow distending, when the second body 3 distending arrives to a certain degree, the 3rd engaging place 312 on second body 3 engages with first on the first noumenon 1 locates 13 phase clampings, and the second body 3 reaches maximum distending degree.The second body 3 after distending can form the protection ring of one rigidity, when after packer setting, can expanded radially be there is in packing element 6, due to the rigid protective ring that the second body 3 is formed, can at the left and right two end supports protection packing element 6 of packing element 6, block packing element 6 to move to the narrow space of sleeve pipe or the borehole wall, prevent packing element 6 from after stressed, turning over glue or play, solve packing element 6 and cause owing to giving prominence to the disadvantage that packing element 6 is torn in pressure-bearing process, in addition, the protective device of packing element is positioned at the two ends of packing element 6, the protective device of packing element and packing element 6 are not integral structures, decrease packing element 6 manufacture difficulty and cost of manufacture, increase substantially the bearing capacity of packer.
The first noumenon 1 in the protective device of packing element and the second body 3 are generally made up of the metal material with certain degree of hardness; when the second body 3 struts under the extruding of the first noumenon 1; larger plastic strain can not be there is; second body 3, by even distending, can play certain centralizing function between two parties to packer.The block construction of the second body 3 is conducive to it on the one hand and can be assemblied in outside the first noumenon 1; second gap of body 3 upon inflation between unit and unit of piecemeal is less on the one hand in addition; and the second body 3 is expanded in radial directions; its diameter increases; effective minimizing or the annular space space be filled with between the protective device of packing element and sleeve pipe; can prevent from packing element 6 from producing stream when pressure is higher to become, thus improve the bearing capacity of packer.
First holding section of the protective device of packing element and the second holding section are of value to the bearing capacity improving packer further.When behind the first holding section and the docking clamping of the second holding section; when second body 3 relative sliding forms maximum protection radius; clamping ensure that the second body 3 cannot continue outside slip; the protective device of packing element is avoided to lose efficacy; when packing element 6 is stressed; second body 3 plays the effect of rigidity protrusion-dispelling to it, and forms maximum protection radius in clamping position, improves the bearing capacity of whole packer.
In a preferred embodiment, the top right-hand side face of contact part 12 also has having three pyramidal faces 121, first holding section also comprises the outer rim that the second engaging place 14, second engaging place 14 is positioned at contact part 12, and the second engaging place 14 is in shoulder shape and annular is arranged at the first noumenon 1.Each second body unit also comprises three lug boss 32 outstanding towards the direction of close center line with the 4th conical surface 321,3rd lug boss 32 is positioned at the right-hand member of the second body unit, its cross section is roughly triangular in shape, its left surface is that the 4th conical surface the 321, four conical surface 321 is corresponding with having three pyramidal faces 121.Due to the existence of the second lug boss 31 and the 3rd lug boss 32, between the second lug boss 31 and the 3rd lug boss 32, be formed with a recess.Second holding section also comprises the top that the 4th engaging place the 34, four engaging place 34 is positioned at the 3rd lug boss 32, in shoulder shape.When the first noumenon 1 and the second body 3 are in original state, contact part 12 embeds the recess between the second lug boss 31 and the 3rd lug boss 32, second lug boss 31 embeds the recess between the first lug boss 11 and contact part 12, first conical surface 111 and second conical surface 311 offset, and having three pyramidal faces 121 and the 4th conical surface 321 offset.When the first noumenon 1 is stressed in the axial direction; second body 3 is slided by second conical surface 311 and the 4th conical surface 321 and the first noumenon 1; second body 3 expands formation one rigid protective ring; second engaging place 14 simultaneously engages place 34 with the 4th and clamping occurs, and prevents the first noumenon 1 and the second body 3 from sliding further.Due to the first noumenon 1 and the right-hand member of the second body 3 many together with the conical surface of relative sliding, more stable when can make the first noumenon 1 and the second body 3 relative sliding.Generally speaking; first conical surface 111, having three pyramidal faces 121, second conical surface 311 and the 4th conical surface 321 in the protective device of packing element are conducive to the second body 3 by even distending; after the first noumenon 1 is subject to axially loaded; through multiple conical surface, axial force is converted into radial load; by stable for the piecemeal of the second body 3 radially even distending; so, improve the stability of the protective device work of packing element.
In a preferred embodiment, limited impression 33 on second body 3 outer wall can be two, two limited impressions lay respectively at the two ends of the second body 3 outer wall, twice limited impression 33 inside is equipped with for the second body unit is tightened to holistic elastic collar 2, so, respectively establish one limited impression 33 at the two ends of the second body 3, be conducive to elastic collar 2 and carry out fastening to the second body 3, fastening power two ends are even, and then improve the fastening stability of elastic collar 2.
In the preferred embodiment of one; Fig. 2 is the schematic diagram of the protective device cross section of packing element of the present utility model; as shown in Figure 2; second body 3 is divided into 24 the second body unit uniformly around center line, so, is conducive to the second body 3 uniformity that all directions expand when distending; simultaneously; at the second body 3 piecemeal when mounted, can one by one unit be installed on packer, before going into the well, form the tubular structure of a set of entirety.Secondly, elastic collar 2 is made up of the rubber of high strength, so, by the high-strength rubber elastic collar 2 in the second body 3 unit with grooves in outer wall, piecemeal is formed tubular structure again, and the rubber of high strength can ensure the fastening contraction power of the long validity of the second body 3 and elastic collar 2.
In a preferred embodiment, first conical surface 111 on the first noumenon 1, second conical surface 311 on having three pyramidal faces 121 and the second body 3, 4th conical surface 321 is 30 degree with the angle of described center line, so, when the first noumenon 1 is after axially loaded, by the conflict of first conical surface 111 and second conical surface 311, when axial force is transformed into the radial load be applied on the second body 3 by the conflict of having three pyramidal faces 121 and the 4th conical surface 321, the angle of 30 degree is conducive to both the first noumenon 1 and the second body 3 and easier slides, the second body 3 distending is made to form rigid protective ring.
A kind of packer; it comprises the protective device of above-mentioned arbitrary packing element; as shown in Figure 3; the protective device of packing element is installed on outside the central tube 4 of packer; be specially paired use, be separately positioned on the right and left of packing element 6, to protect packing element 6; prevent packing element 6 from after stressed, turning over glue or play, solve packing element 6 and cause owing to giving prominence to the disadvantage that packing element 6 is torn in pressure-bearing process.
Each embodiment in this manual all adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar part mutually see.
Above-described embodiment, only for technical conceive of the present utility model and feature are described, its object is to person skilled in the art can be understood content of the present utility model and implement according to this, can not limit protection domain of the present utility model with this.All equivalences done according to the utility model Spirit Essence change or modify, and all should be encompassed within protection domain of the present utility model.
Claims (10)
1. a protective device for packing element, is characterized in that, it comprises:
There is a center line and the first noumenon cylindrically, the outer wall of described the first noumenon comprise there is first conical surface the first lug boss, contact part and the first holding section;
Can relatively described the first noumenon centrally line direction slide the second body, it comprises multiple the second body unit around the arrangement of center line circumferencial direction, each second body unit comprises the second lug boss and the second holding section, described second lug boss has second conical surface corresponding with described first conical surface, when relatively described second body of described the first noumenon slides, second conical surface of described second body can along first conical surface of described the first noumenon towards moving radially away from described center line, so that the second holding section of described second body and the first holding section phase clamping of described the first noumenon, described second lug boss can offset with described contact part, the outer wall of described second body forms ringwise limited impression, elastic collar is provided with in described limited impression.
2. the protective device of packing element according to claim 1; it is characterized in that; described limited impression is two; two described limited impressions lay respectively at the two ends of described second body outer wall, are equipped with for by described elastic collar fastening for described second body unit in each described limited impression.
3. the protective device of packing element according to claim 1, is characterized in that, described contact part has having three pyramidal faces, and described second body unit also comprises the 3rd lug boss, and described 3rd lug boss comprises four conical surface corresponding with described having three pyramidal faces.
4. the protective device of packing element according to claim 3; it is characterized in that; described first holding section comprises the first engaging place and the second engaging place, and described first engaging place is positioned at the outer rim of described first lug boss, and described second engaging place is positioned at the outer rim of described contact part.
5. the protective device of packing element according to claim 4, is characterized in that, described first engaging place and described second engaging place are in shoulder shape.
6. the protective device of packing element according to claim 3; it is characterized in that; described second holding section comprises the 3rd engaging place and the 4th engaging place, and described 3rd engaging place is positioned at the inner edge of described second lug boss, and described 4th engaging place is positioned at the inner edge of described 3rd lug boss.
7. the protective device of packing element according to claim 6, is characterized in that, described 3rd engaging place and described 4th engaging place are in shoulder shape.
8. the protective device of packing element according to claim 3, is characterized in that, the angle of described first conical surface, described having three pyramidal faces, described second conical surface, described 4th conical surface and described center line is 30 degree.
9. the protective device of packing element according to claim 1 and 2, is characterized in that, described elastic collar is made up of rubber.
10. a packer, is characterized in that, it comprises the protective device of the packing element any one of the claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520043370.3U CN204532230U (en) | 2015-01-22 | 2015-01-22 | The protective device of packing element |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520043370.3U CN204532230U (en) | 2015-01-22 | 2015-01-22 | The protective device of packing element |
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| CN204532230U true CN204532230U (en) | 2015-08-05 |
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| CN201520043370.3U Expired - Fee Related CN204532230U (en) | 2015-01-22 | 2015-01-22 | The protective device of packing element |
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| CN (1) | CN204532230U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106522873A (en) * | 2016-12-28 | 2017-03-22 | 隆学武 | Rubber sleeve with disk spring, packer and bridge plug |
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2015
- 2015-01-22 CN CN201520043370.3U patent/CN204532230U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106522873A (en) * | 2016-12-28 | 2017-03-22 | 隆学武 | Rubber sleeve with disk spring, packer and bridge plug |
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