CN208934633U - A kind of casing patching subsidy tubing string - Google Patents
A kind of casing patching subsidy tubing string Download PDFInfo
- Publication number
- CN208934633U CN208934633U CN201821824079.XU CN201821824079U CN208934633U CN 208934633 U CN208934633 U CN 208934633U CN 201821824079 U CN201821824079 U CN 201821824079U CN 208934633 U CN208934633 U CN 208934633U
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- subsidy
- pipeline section
- section
- slip spider
- casing
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- 238000007789 sealing Methods 0.000 claims abstract description 52
- 241000239290 Araneae Species 0.000 claims abstract description 37
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- 239000003566 sealing material Substances 0.000 claims description 7
- 238000003032 molecular docking Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 abstract description 4
- 230000009471 action Effects 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 9
- 230000006872 improvement Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000004873 anchoring Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-M hydrogensulfate Chemical compound OS([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-M 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Sealing Material Composition (AREA)
Abstract
The utility model provides a kind of casing patching subsidy tubing string, it include: the upper sealing slip spider sequentially docked from top to bottom, the first subsidy pipeline section, the second subsidy pipeline section, lower sealing slip spider, the first subsidy pipeline section and the second subsidy pipeline section are Taper Pipe, the taper of the Taper Pipe is 1:26 ~ 1:40, the small end of the first subsidy pipeline section is docked with the small end of the second subsidy pipe end, and the first subsidy pipeline section and the second subsidy pipeline section are integrally formed.When the utility model makes the first subsidy pipeline section and the second subsidy pipeline section expansion using hydraulic, since swollen head is located at the junction of the first subsidy pipeline section and the second subsidy pipeline section, swollen head promotes the first subsidy pipeline section and the second subsidy pipeline section to expand under the action of highly pressurised liquid, since the pressure of swollen head installation place is maximum, the expansion force of the first subsidy pipeline section and the second subsidy connection between pipe sections is maximum.
Description
Technical field
The utility model relates to casing patching field more particularly to a kind of casing patching subsidy tubing strings.
Background technique
With oil field at home, the oil of coal mine, the extension of gas and water well development time, down-hole casing is in sulfate, hydrogen sulfide etc.
Corrosion under, the damaged condition of down-hole casing continuously emerges, while directly affecting the production of oil gas and the warp of each oil field coal mine
Ji benefit, therefore the improvement for covering damage also just becomes guarantee oil gas, the main problem that well normally produces.
In view of this, it is necessary to existing subsidy casing be improved, to solve the above problems.
Summary of the invention
The purpose of this utility model is to provide a kind of casing patching subsidy tubing strings, pass through hydraulic compressed metal drum
It is swollen, it is generated with internal surface of sleeve pipe and squeezes sealing, while both ends slips anchoring formula is fixed on casing wall, the leakage loss position of casing obtains
It repairs.
Realize that the technical solution of the utility model aim is as follows:
A kind of casing patching subsidy tubing string, comprising: upper sealing slip spider, the first patching tube sequentially docked from top to bottom
Section, the second subsidy pipeline section, lower sealing slip spider, the first subsidy pipeline section and the second subsidy pipeline section are Taper Pipe, the Taper Pipe
Taper is 1:26 ~ 1:40, and the small end of the first subsidy pipeline section is docked with the small end of the second subsidy pipe end, first patching tube
Section is integrally formed with the second subsidy pipeline section.The utility model keeps the first subsidy pipeline section and the second subsidy pipeline section swollen using hydraulic
When swollen, since swollen head is located at the junction of the first subsidy pipeline section and the second subsidy pipeline section, swollen head promotees under the action of highly pressurised liquid
The first subsidy pipeline section and the second subsidy pipeline section are expanded, since the pressure of swollen head installation place is maximum, the first patching tube
Section and the expansion force of the second subsidy connection between pipe sections are maximum, and the utility model subsidizes pipeline section and the second subsidy pipeline section point for first
It is not arranged to Taper Pipe, therefore the diameter after the first subsidy pipeline section and the second subsidy pipeline section expansion is equal.The utility model is by Taper Pipe
Taper be arranged to 1:26 ~ 1:40, when to repairing at the leakage loss of down-hole casing, subsidy effect is more preferable.The utility model is adopted
The first subsidy pipeline section and the second subsidy pipeline section, when swollen head being made to work under high pressure, the first subsidy are manufactured with integrally formed mode
The junction of pipeline section and the second subsidy pipeline section will not cracking.
As a further improvement of the utility model, it is described first subsidy pipeline section top, second subsidy pipeline section bottom end
It is respectively provided with hollow prismoid section, the big end of the hollow prismoid section is equal with the first subsidy pipeline section outer diameter, the hollow prismoid section
Small end outer diameter be 0.7 ~ 0.9 times of big end outer diameter, the height value of the hollow prismoid section is less than the outer diameter value of prismoid section small end；
The big end of the prismoid section is connect with the bottom end on the top of the first subsidy pipeline section or the second subsidy pipeline section.The utility model is by setting
Hollow prismoid section is set, sealing patching tube and upper sealing slip spider are not only facilitated, after subsidizing tube swelling, due to hollow prismoid section
There is gap between the inner wall of down-hole casing, it can be quickly to down-hole casing and the first subsidy pipeline section, the second benefit by this gap
Sealant is perfused between patch pipeline section, keeps down-hole casing more permanent using the time.
The junction of the upper sealing slip spider and the first subsidy pipeline section is equipped with as a further improvement of the utility model,
The junction of first band, the lower sealing slip spider and the second subsidy pipeline section is equipped with the second band, first sealing
Band, the second band are made of carbon graphite sealing material.The mesh of the utility model setting the first band and the second band
, it is easy for the sealing of sealing slip spider and the first subsidy pipeline section, the sealing of lower sealing slip spider and the second subsidy pipeline section；This
First band of utility model and the second band select purpose made of carbon graphite sealing material, are to subsidize pipeline section for first
After the second subsidy pipeline section expansion, carbon graphite sealing material can be thermally expanded under heat effect, convenient for sealing card in extraction
Watt seat and lower sealing slip spider.
The top of the upper sealing slip spider is equipped with pull rod as a further improvement of the utility model, and the pull rod is same
When with it is upper sealing slip spider inner wall, it is lower sealing slip spider inner wall contact.The purpose of pull rod is arranged in the utility model, is easy for
Slip spider and lower sealing slip spider are sealed in pull-out.
The first subsidy pipeline section, the second inner hole for subsidizing pipeline section are cylinder as a further improvement of the utility model,
Hole.The inner hole of first subsidy pipeline section and the second subsidy pipeline section is arranged to the purpose of cylindrical hole by the utility model, is easy in hole
It is interior to place swollen head.
The bottom end of the lower sealing slip spider is equipped with plug as a further improvement of the utility model,.The utility model
The purpose that plug is arranged is easy for the first subsidy pipeline section, the inner hole of the second subsidy pipeline section forms seal chamber, is more conducive to the first benefit
The expansion of patch pipe and the second patching tube.
Compared with prior art, the utility model has the beneficial effects that
There is ellipticity or irregular shape for casing, as long as in the case where guarantee tool passes through, the utility model
Subsidy tubing string can reinforce sealing.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of patching tube；
Fig. 2 is the state diagram before casing patching subsidy tubing string expands；
Fig. 3 is the structural schematic diagram for subsidizing tubing string.
In figure, the 10, first subsidy pipeline section；10-1, the first hollow prismoid section；20, the second subsidy pipeline section；20-1, the second sky
Heart prismoid section；30, upper sealing slip spider；40, lower sealing slip spider；50, the first band；60, the second band；100, underground
Casing；200, at leakage loss；1, connector；2, connecting rod；3, hydraulic cylinder；4, built-in synchronizer；5, upper seal support；6, internal locking
Retaining ring；11, built-in stress damper；12, rivet slips；13, built-in clutch；14, shearing ring；15, pull rod is locked.
Specific embodiment
The utility model is described in detail in each embodiment shown in reference to the accompanying drawing, but it should be stated that,
These embodiments are not limitation of the utility model, those of ordinary skill in the art according to these embodiments made by function
Energy, method or equivalent transformation or substitution in structure, belong within the protection scope of the utility model.
In the description of the present embodiment, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description the invention and simplifies description, rather than indicate
Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot understand
For the limitation to the invention.
In addition, term " first ", " second ", " third " etc. are used for description purposes only, it is not understood to indicate or imply
Relative importance or the quantity for implicitly indicating indicated technical characteristic.The feature of " first ", " second " etc. is defined as a result,
It can explicitly or implicitly include one or more of the features.In the description of the invention, unless otherwise indicated,
The meaning of " plurality " is two or more.
Term " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, be also possible to removable
Connection is unloaded, or is integrally connected；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be in
Between medium be indirectly connected, can be the connection inside two elements.For the ordinary skill in the art, can pass through
Concrete condition understands concrete meaning of the above-mentioned term in the invention.
Embodiment 1:
With oil field at home, the oil of coal mine, gas, the extension of well development time, down-hole casing is in sulfate, hydrogen sulfide etc.
Corrosion under, the damaged condition of down-hole casing continuously emerges, while directly affecting the production of oil gas and the warp of each oil field coal mine
Ji benefit, therefore the improvement for covering damage also just becomes guarantee oil gas, water, the main problem that well normally produces.High-intensitive self-locking slips
Formula casing patching technology has advanced and original one side in terms of set damages improvement, this technical matters mainly uses hydraulic
Compressed metal bulging generates with internal surface of sleeve pipe and squeezes sealing, while both ends slips anchoring formula is fixed on casing wall, leakage loss position
It is repaired.Traditional straight-tube shape patching tube is unable to satisfy the demand of high-strength self-locking slip type casing patching technology, therefore anxious
Traditional patching tube need to be improved.
Present embodiment discloses a kind of casing patching subsidy tubing strings, comprising: the upper sealing card sequentially docked from top to bottom
Watt seat 30, first subsidizes pipeline section 10, second and subsidizes pipeline section 20, lower sealing slip spider 40, and the first subsidy pipeline section 10 and second are subsidized
Pipeline section 20 is Taper Pipe, and the taper of the Taper Pipe is 1:26 ~ 1:40, and the small end of the first subsidy pipeline section 10 is small with the second subsidy pipe end
End docking, the first subsidy pipeline section 10 and the second subsidy pipeline section 20 are integrally formed.The present embodiment makes the first subsidy using hydraulic
When pipeline section 10 and the second subsidy pipeline section 20 expand, since swollen head is located at the connection of the first subsidy pipeline section 10 and the second subsidy pipeline section 20
Place, swollen head promotes the first subsidy pipeline section 10 and the second subsidy pipeline section 20 to expand under the action of highly pressurised liquid, due to swollen head
The pressure of installation place is maximum, therefore the expansion force of the first subsidy pipeline section 10 and the second subsidy 20 junction of pipeline section is maximum, this reality
It applies example and the first subsidy pipeline section 10 and the second subsidy pipeline section 20 is arranged respectively to Taper Pipe, therefore the first subsidy pipeline section 10 and second is mended
It is equal to paste the diameter after pipeline section 20 expands.The taper of Taper Pipe is arranged to 1:26 ~ 1:40 by the present embodiment, to down-hole casing 100
200 when being repaired at leakage loss, and subsidy effect is more preferable.The present embodiment manufactures the first subsidy pipeline section 10 using integrally formed mode
With the second subsidy pipeline section 20, when swollen head being made to work under high pressure, the junction of the first subsidy pipeline section 10 and the second subsidy pipeline section 20
It will not cracking.
It is preferred that the bottom end on the top of the first subsidy pipeline section 10, the second subsidy pipeline section 20 is respectively provided with hollow prismoid section, it is hollow
The big end of prismoid section is equal with the first subsidy 10 outer diameter of pipeline section, and the small end outer diameter of hollow prismoid section is the 0.7 ~ 0.9 of big end outer diameter
Times, the height value of hollow prismoid section is less than the outer diameter value of prismoid section small end；The top of the big end of prismoid section and the first subsidy pipeline section 10
The bottom end connection of end or the second subsidy pipeline section 20.The present embodiment not only facilitates sealing patching tube by the way that hollow prismoid section is arranged
With upper sealing slip spider 30, after subsidizing tube swelling, between having between hollow prismoid section and the inner wall of down-hole casing 100
Gap quickly can be subsidized to be perfused between pipeline section 20 and sealed by this gap to down-hole casing 100 and the first subsidy pipeline section 10, second
Glue keeps down-hole casing 100 more permanent using the time.
It is preferred that the junction of upper sealing slip spider 30 and the first subsidy pipeline section 10 is equipped with the first band 50, lower sealing slips
The junction of seat 40 and the second subsidy pipeline section 20 is equipped with the second band 60, and the first band 50, the second band 60 are by carbon
Graphite sealing material is made.The purpose of the first band 50 and the second band 60 is arranged in the present embodiment, is easy for sealing card
The sealing of watt seat 30 and the first subsidy pipeline section 10, the sealing that lower sealing slip spider 40 subsidizes pipeline section 20 with second；The present embodiment
First band 50 and the second band 60 select purpose made of carbon graphite sealing material, are by the first subsidy pipeline section 10 and the
After two subsidy pipeline sections 20 expand, carbon graphite sealing material can be thermally expanded under heat effect, convenient for sealing slips in extraction
Seat 30 and lower sealing slip spider 40.
It is preferred that the top of upper sealing slip spider 30 is equipped with pull rod, pull rod simultaneously with the inner wall of upper sealing slip spider 30, under it is close
Seal the inner wall contact of slip spider 40.The purpose of pull rod is arranged in the present embodiment, is easy for pulling out sealing slip spider 30 and lower sealing
Slip spider 40.
It is preferred that the inner hole that the first subsidy pipeline section 10, second subsidizes pipeline section 20 is cylindrical hole.The present embodiment is by the first patching tube
The inner hole of section 10 and the second subsidy pipeline section 20 is arranged to the purpose of cylindrical hole, is easy for placing swollen head in hole.
It is preferred that the bottom end of lower sealing slip spider 40 is equipped with plug.The purpose of the present embodiment setting plug is easy for the first subsidy
The inner hole that pipeline section 10, second subsidizes pipeline section 20 forms seal chamber, is more conducive to the expansion of the first patching tube and the second patching tube.
The casing patching of the present embodiment is had the advantage that with subsidy tubing string
1, it synchronizes self-locking slips to fix, will not glide due to tool collision under operation.
2, this subsidy technology will not oil supply, gas and water well cause overhaul or other down-hole accidents.
3, there is ellipticity or irregular barrel dliameter for casing, can be reinforced in the case where guarantee tool passes through close
Envelope.
4, anti-high pressure 35Mpa and tool fishing property after casing patching.
5, high-voltage ultralong subsidizes longest 50m
6, easy to operate, it is not limited by conditions such as temperature, 500 DEG C of high temperature resistant
7, subsidy tool is gone into the well when being hampered, and can be forced through in right amount.
8, this subsidy technology can be applied to oil, gas well blocks water layer, and oil reservoir perforated interval is scrapped in closure.
9, soft metal wall thickness 8mm after subsidizing, the influence very little to subsequent production tool
10, after subsidizing, the service life of patching tube is equal with current set tube lifetime.
High-strength self-locking slip type casing patching technique is a technology more more advanced than the prior art, it effectively overcomes
The shortcomings of the prior art and defect change subsidy tool construction, enhance casing patching length, to be one have hair very much
The technology of exhibition prospect restores oil/gas well production to casing damaged well, improves old area oil recovery rate and be of great significance.
Embodiment 2:
On the basis of embodiment 1, this gives the practical application examples of a subsidy casing.
Well casing outer diameter 139.7mm internal diameter 124mm to be subsidized.Subsidy tool is as follows:
1. subsidizing the anti-high pressure 35Mpa of bushing pipe outer diameter 116mm internal diameter 100mm wall thickness 8mm.
2. connection type: the partially terraced seal buckle link of 1:16 taper.
3. fixed form: slips anchoring formula is fixed, and upper and lower ends have draw tiltedly.
4. sealing means: compressing soft metal bulging with hydraulic, generated with internal surface of sleeve pipe and squeeze sealing, anti-high pressure
35Mpa。
Subsidy process:
1. after going out down-hole string and oil well pump, Imitating gauguste cutter (118 × 8m of gauguste cutter outer diameter)；2. according to set
Pipe deformation diameter enlarging；3. testing leakage instrument with packer or electronics finds leakage loss position accurately；4. implementing pipe cleaning, well casing inner wall
It cleans out, then well-flushing；5. fitting allowance tool (according to leakage loss position distance, adjusts the length of subsidy tool)；6. lower mend
Patch tool and center pull rod, then connect hydraulic tool, in 5 well casing of tripping in；7. it is connect with 27/8 oil pipe with hydraulic tool,
It is directly lower to arrive leakage loss position.8. being connect with high-pressure hose with well head pump truck；9. pump truck suppresses (pressure 16Mpa~20Mpa) tool
It is setting；10. go out 2,27/8 oil pipe, fill well head, full well pressure testing；11. going out 27/8 oil pipe and hydraulic tool, inflatable technology is complete
At.
Tool of the series of detailed descriptions listed above only for the feasible embodiment of the utility model
Body explanation, they are all without departing from made by the utility model skill spirit not to limit the protection scope of the utility model
Equivalent implementations or change should be included within the scope of protection of this utility model.
It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and
And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this is practical new in other specific forms
Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this is practical new
The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing for the equivalent requirements of the claims will be fallen in
All changes in justice and range are embraced therein.It should not treat any reference in the claims as limiting
Related claim.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (6)
1. a kind of casing patching subsidy tubing string, comprising: the upper sealing slip spider (30) sequentially docked from top to bottom, the first subsidy
Pipeline section (10), second subsidy pipeline section (20), lower sealing slip spider (40), which is characterized in that it is described first subsidize pipeline section (10) and
Second subsidy pipeline section (20) is Taper Pipe, and the taper of the Taper Pipe is 1:26 ~ 1:40, the small end of first subsidy pipeline section (10) with
The small end docking of second subsidy pipe end, first subsidy pipeline section (10) are integrally formed with the second subsidy pipeline section (20).
2. casing patching according to claim 1 subsidy tubing string, which is characterized in that first subsidy pipeline section (10)
Top, the second bottom end for subsidizing pipeline section (20) are respectively provided with hollow prismoid section, the big end of the hollow prismoid section and the first subsidy
Pipeline section (10) outer diameter is equal, and the small end outer diameter of the hollow prismoid section is 0.7 ~ 0.9 times of big end outer diameter, the hollow prismoid section
Height value be less than prismoid section small end outer diameter value；The top or second of the big end of the prismoid section and the first subsidy pipeline section (10)
Subsidize the bottom end connection of pipeline section (20).
3. casing patching according to claim 1 or 2 subsidy tubing string, which is characterized in that the upper sealing slip spider
(30) junction with the first subsidy pipeline section (10) is equipped with the first band (50), and the lower sealing slip spider (40) is mended with second
The junction for pasting pipeline section (20) is equipped with the second band (60), and first band (50), the second band (60) are by carbon
Graphite sealing material is made.
4. casing patching according to claim 1 subsidy tubing string, which is characterized in that upper sealing slip spider (30)
Top is equipped with pull rod, and the pull rod is contacted with the inner wall of the inner wall of upper sealing slip spider (30), lower sealing slip spider (40) simultaneously.
5. casing patching according to claim 1 or 2 subsidy tubing string, which is characterized in that the first subsidy pipeline section
(10), the inner hole of the second subsidy pipeline section (20) is cylindrical hole.
6. according to claim 1,2 or 4 described in any item casing patchings subsidy tubing string, which is characterized in that the lower sealing
The bottom end of slip spider (40) is equipped with plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821824079.XU CN208934633U (en) | 2018-11-07 | 2018-11-07 | A kind of casing patching subsidy tubing string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821824079.XU CN208934633U (en) | 2018-11-07 | 2018-11-07 | A kind of casing patching subsidy tubing string |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208934633U true CN208934633U (en) | 2019-06-04 |
Family
ID=66727296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201821824079.XU Active CN208934633U (en) | 2018-11-07 | 2018-11-07 | A kind of casing patching subsidy tubing string |
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| CN (1) | CN208934633U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852373A (en) * | 2020-06-24 | 2020-10-30 | 中国石油天然气股份有限公司 | A heat-sensitive high temperature shape memory polymer sleeve subsidy process |
-
2018
- 2018-11-07 CN CN201821824079.XU patent/CN208934633U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852373A (en) * | 2020-06-24 | 2020-10-30 | 中国石油天然气股份有限公司 | A heat-sensitive high temperature shape memory polymer sleeve subsidy process |
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