CN106351602A - Expanding type differential pressure opening type fine leakage finding and leakage checking packer - Google Patents

Expanding type differential pressure opening type fine leakage finding and leakage checking packer Download PDF

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Publication number
CN106351602A
CN106351602A CN201610955627.1A CN201610955627A CN106351602A CN 106351602 A CN106351602 A CN 106351602A CN 201610955627 A CN201610955627 A CN 201610955627A CN 106351602 A CN106351602 A CN 106351602A
Authority
CN
China
Prior art keywords
omission
packing element
leakage
lower rubber
look
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610955627.1A
Other languages
Chinese (zh)
Inventor
仝少凯
王祖文
白明伟
杨小平
岳艳芳
樊炜
温亚魁
任荣利
张冕
徐迎新
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Changqing Downhole Operation Co of CNPC Chuanqing Drilling Engineering Co Ltd
Original Assignee
Changqing Downhole Operation Co of CNPC Chuanqing Drilling Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Changqing Downhole Operation Co of CNPC Chuanqing Drilling Engineering Co Ltd filed Critical Changqing Downhole Operation Co of CNPC Chuanqing Drilling Engineering Co Ltd
Priority to CN201610955627.1A priority Critical patent/CN106351602A/en
Publication of CN106351602A publication Critical patent/CN106351602A/en
Pending legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/12Packers; Plugs
    • E21B33/127Packers; Plugs with inflatable sleeve
    • E21B33/1277Packers; Plugs with inflatable sleeve characterised by the construction or fixation of the sleeve

Abstract

The invention provides an expanding type differential pressure opening type fine leakage finding and leakage checking packer. The expanding type differential pressure opening type fine leakage finding and leakage checking packer comprises an upper rubber sleeve and a lower rubber sleeve, wherein two ends of the upper rubber sleeve are connected with an upper rubber sleeve upper base and an upper rubber sleeve lower base respectively; the two ends of the lower rubber sleeve are connected with a lower rubber sleeve upper base and a lower rubber sleeve lower base respectively; the upper rubber sleeve lower base and the lower rubber sleeve upper base are connected though a check valve body, and the check valve body is provided with a check valve; and an upper slit central pipe is arranged in the upper rubber sleeve, and a lower slit central pipe is arranged in the lower rubber sleeve. By adopting a manner of combining the upper and lower rubber sleeves and the check valve, the aims of accurately determining a layer position, finely judging a leakage point position and easily unpacking setting are realized according to low-differential-pressure setting and a constant distance of the upper and lower rubber sleeves and a high-differential-pressure forward opening function of the check valve; and the problems of an existing old well leakage finding and leakage checking packer (tubular column) of an existing oil-gas well that leakage finding is extensive, a leakage point is easy to miss, performances are not reliable, the unpacking is difficult and the like are solved.

Description

A kind of expanding pressure reduction is opened and is finely looked for omission of examination leakage packer
Technical field
The present invention relates to a kind of expanding pressure reduction is opened finely looks for omission of examination leakage packer, it is primarily adapted for use in the old Jing Jing of Oil/gas Well Cylinder is looked in omission of examination leakage operation.
Background technology
In recent years, Changqing oilfields Oil/gas Well old well well workover business gradually increases, be mainly manifested in old well look for Lou, test Lou, stifled The aspects such as leakage, shaft deformation, sand washing, salvaging reducer.Because old well produces, the cycle is long, and yield gradually decreases, the old well of great majority Needs carry out repeating to transform pressure break, and to improve old well yield and recovery ratio, but the early stage repeating to transform seeks to judge pit shaft Whether there is leakage point, whether pit shaft has deformation, and assessing pit shaft leakage situation is an of paramount importance job.And current, oil Gas well great majority look for omission of examination leakage packer tubing string all using double envelope single deck tape-recorder packer tubing strings, carry two compression packers, tubing string Bit freezing easily occurs during above carrying, slips unseals the problems such as difficult, packing element weares and teares, look for leak source to be that comparison is extensive simultaneously, look for leakage During easy staggered floor position stuck point, lead to the situation missing leak source more it is impossible to accurately judge the whole leak source of pit shaft, thus cannot There is provided good wellbore conditions to repeating to transform.
For this reason, finely looking for omission of examination leakage demand in order to be able to efficiently meet old well, a kind of expanding pressure reduction of innovative design is opened Finely look for omission of examination leakage packer.
Content of the invention
The purpose of the present invention be the old well of the existing Oil/gas Well of effectively solving look for the omission of examination leakage packer (tubing string) look for Lou extensive, easy Miss the problems such as leak source, performance are unreliable, deblocking is difficult, improve and look for omission of examination leakage success rate and its degree that becomes more meticulous, be Oil/gas Well Old well repeats transformation provides pit shaft decision-making foundation.A kind of expanding pressure reduction that the present invention provides is opened and is finely looked for omission of examination leakage packing Device, make the old well of Oil/gas Well look for omission of examination leakage packer tubing string only need to connect one this finely look for omission of examination leakage packer it is possible to realize Accurately card layer position, fine judge leak source position, set the easy target of deblocking.
The technical scheme is that
A kind of expanding pressure reduction is opened and is finely looked for omission of examination leakage packer, and including upper packing element and lower rubber cylinder, described upper packing element two ends are divided It is not connected with seat under the packing element seat of honour and upper packing element;Described lower rubber cylinder two ends are connected under the lower rubber cylinder seat of honour and lower rubber cylinder Seat;Connected by unidirectional valve body between seat and the lower rubber cylinder seat of honour under described upper packing element, described unidirectional valve body is provided with unidirectional Valve;It is provided with slotted base pipe in described upper packing element, in described lower rubber cylinder, be provided with lower slotted base pipe.
Described check valve includes valve seat, spring and valve element, and described spring is located between valve seat and valve element.
Under described lower rubber cylinder, seat lower end is connected with lower contact;It is connected with top connection on the described upper packing element seat of honour.
Described top connection is tightly connected by sealing ring with the upper packing element seat of honour.
Described upper packing element is identical with the structure of lower rubber cylinder, long 300mm, and spacing 1200mm sets pressure reduction 1.0mpa.
The length direction local of described upper slotted base pipe and lower slotted base pipe all has slot, the long 1.0mm of its slot, Wide 0.5mm.
Described upper slotted base pipe and lower slotted base pipe are all using 35crmo materials processing, hardness hb197 ~ 235.
Described upper packing element is identical with lower rubber cylinder structure, all using the oil resistant hydrogenated nitrile-butadiene rubber of shoulder protection.
Described check valve adopts stainless steel material, bore dn06-32, Opening pressure 4.0mpa.
The button-type of described top connection and lower contact is 2-7/8 " eue.
The invention has the benefit that
The present invention adopts packing element and lower rubber cylinder and the combined mode of check valve in structure design, according to upper packing element and lower rubber cylinder Between constant length and check valve forward direction open function it is achieved that accurate card layer position, fine judging leak source position, easily set deblocking Purpose, solve the old well of existing Oil/gas Well look for the omission of examination leakage packer (tubing string) look for Lou extensive, easily miss leak source, performance can not The problems such as lean on, unseal difficulty, improves oil gas well shaft and looks for omission of examination leakage success rate and its integrity to become more meticulous assessment efficiency.Structure Simply, easy to use, application effect substantially, looks for omission of examination leakage success rate high, practical.
It is further detailed below with reference to accompanying drawing.
Brief description
Fig. 1 is that omission of examination leakage packer schematic diagram is finely looked in a kind of expanding pressure reduction unlatching.
Fig. 2 is check valve schematic diagram.
Reference is as follows: 1- top connection;2- sealing ring;The 3- upper packing element seat of honour;The upper slotted base pipe of 4-;The upper packing element of 5-; Seat under the upper packing element of 6-;The unidirectional valve body of 7-;8- check valve;The 9- lower rubber cylinder seat of honour;Slotted base pipe under 10-;11- lower rubber cylinder;12- Seat under lower rubber cylinder;13- lower contact;14- valve seat;15- spring;16- valve element.
Specific embodiment
Embodiment 1:
The purpose of the present invention be the old well of the existing Oil/gas Well of effectively solving look for the omission of examination leakage packer (tubing string) look for Lou extensive, easily miss The problems such as leak source, performance are unreliable, deblocking is difficult, improves and looks for omission of examination leakage success rate and its degree that becomes more meticulous, be the old well of Oil/gas Well Repeating transformation provides pit shaft decision-making foundation.A kind of expanding pressure reduction as shown in Figure 1 that the present invention provides is opened and is finely looked for the omission of examination Leakage packer, make the old well of Oil/gas Well look for omission of examination leakage packer tubing string only need to connect one this finely look for omission of examination leakage packer so that it may To realize accurate card layer position, fine judgement leak source position, to set the easy target of deblocking.
A kind of expanding pressure reduction is opened and is finely looked for omission of examination leakage packer, including upper packing element 5 and lower rubber cylinder 11, described upper packing element 5 two ends are connected to seat 6 under the packing element seat of honour 3 and upper packing element;Described lower rubber cylinder 11 two ends are connected to the lower rubber cylinder seat of honour 9 With seat 12 under lower rubber cylinder;Connected by unidirectional valve body 7 between seat 6 and the lower rubber cylinder seat of honour 9 under described upper packing element, described check valve Body 7 is provided with check valve 8;It is provided with slotted base pipe 4 in described upper packing element 5, be provided with lower slot in described lower rubber cylinder 11 Heart pipe 10.
The present invention is based on constant length and the positive open function of check valve 8 between upper packing element 5 and lower rubber cylinder 11, and liquid is along pipe Post and upper slotted base pipe flow at check valve 8, continue infusion liquid, when upper and lower slotted base pipe fluid pressure exceedes sleeve pipe Annulus fluid pressure, and inside and outside differential pressure rises to after upper and lower packing element sets pressure reduction 1.0mpa, upper and lower packing element could set simultaneously, Block casing annulus position, form limited airtight casing annulus;When upper and lower slotted base pipe and limited airtight casing annulus liquid When pressure differential is more than 4mpa, check valve 8 is positive to be opened, and liquid enters limited airtight casing annulus region from check valve 8, continues to carry High fluid injection discharge capacity simultaneously keeps stable: if now well head pump pressure is decreased obviously, it is intersegmental that this illustrates that the upper and lower packing element of this packer sets Leakage in sleeve pipe, is leak source position at this well depth;If now well head pump pressure does not decline, rise on the contrary, this illustrates this envelope Set intersegmental sleeve pipe every the upper and lower packing element of device intact, do not leak.Principle is it can be determined that the upper and lower packing element of this packer sets accordingly Whether intersegmental sleeve pipe is complete, thus realize becoming more meticulous looking for omission of examination leakage operation.
The present invention adopts packing element 5 and lower rubber cylinder 11 and the combined mode of check valve in structure design, according to upper packing element 5 With 11 constant length of lower rubber cylinder and check valve forward direction open function it is achieved that accurate card layer position, fine judging leak source position, appearance Easily set the purpose of deblocking, solve the old well of existing Oil/gas Well look for the omission of examination leakage packer (tubing string) look for Lou extensive, easily miss leakage The problems such as point, performance are unreliable, deblocking is difficult, improves oil gas well shaft and looks for omission of examination leakage success rate and its integrity to become more meticulous and comment Estimate efficiency.Structure is simple, easy to use, and application effect substantially, looks for omission of examination leakage success rate high, practical.
Embodiment 2:
On the basis of embodiment 1, as shown in Fig. 2 described check valve 8 includes valve seat 14, spring 15 and valve in the present embodiment Core 16, described spring 15 is located between valve seat 14 and valve element 16.
Under described lower rubber cylinder, seat 12 lower end is connected with lower contact 13;It is connected with top connection 1 on the described upper packing element seat of honour 3.
Described top connection 1 is tightly connected by sealing ring 2 with the upper packing element seat of honour 3.
Described upper packing element 5 is identical with the structure of lower rubber cylinder 11, long 300mm, and spacing 1200mm sets pressure reduction 1.0mpa.
The length direction local of described upper slotted base pipe 4 and lower slotted base pipe 10 all has slot, and its slot is long 1.0mm, wide 0.5mm.
Described upper slotted base pipe 4 and lower slotted base pipe 10 are all using 35crmo materials processing, hardness hb197 ~ 235.
Described upper packing element 5 is identical with lower rubber cylinder 11 structure, all using the oil resistant hydrogenated nitrile-butadiene rubber of shoulder protection.
Described check valve 8 adopts stainless steel material, bore dn06-32, Opening pressure 4.0mpa.
The button-type of described top connection 1 and lower contact 13 is 2-7/8 " eue.
This packer length 2680mm providing in the present invention, steel body maximum outside diameter 118mm, interior latus rectum 56mm, upper and lower The long 300mm of packing element, spacing 1200mm, set pressure reduction 1.0mpa, check valve 8 starting differential pressure 4.0mpa, upper and lower slotted base pipe office Portion's length direction slot long 1.0mm, wide 0.5mm, upper and lower joint button-type is 2-7/8 " eue.Described upper and lower slotted base pipe adopts 35crmo materials processing, thermally treated hb197 ~ 235, and carry out slot hole in focal length direction using line cutting technology, it is Packing element sets offer liquid feed channel;Upper and lower packing element adopts the oil resistant hydrogenated nitrile-butadiene rubber (hnbr) of shoulder protection, has very High high temperature resistant, anticorrosive, wear-resisting, anti-shear performance;Check valve 8 adopts stainless steel material, bore dn06-32, Opening pressure 4.0mpa;During processing and manufacturing, slotted base pipe, check valve 8 etc. are not allow for the defects such as crackle, pore.
Under unidirectional valve body 7 in the present invention and upper packing element, seat 6, the lower rubber cylinder seat of honour 9, upper and lower slotted base pipe pass through screw thread Connect.
Check valve 8 in the present invention is threadeded by the valve seat in check valve 8 with unidirectional valve body 7.
The connected mode of the present invention is threaded, in order to dismantling, changing and maintain.
The application mode of the present invention is:
1., before the old well shaft of Oil/gas Well carries out looking for omission of examination leakage operation first, should have been predicted whether according to early stage pit shaft working condition Leak source and the position of leak source, probably provide a well depth position.
2., according to looking for omission of examination leakage packer tubular column structure figure, this expanding pressure reduction is opened and finely looks for omission of examination leakage packer It is connected to and look for the omission of examination leakage corresponding position of packer tubing string.
3. complete above-mentioned look for omission of examination leakage packer tubing string to connect after, this is looked for entering in advance under omission of examination leakage packer tubing string The well depth position of prediction.
4. after putting in place under tubing string, infusion liquid in tubing string, liquid reaches this along tubing string and finely looks for omission of examination leakage packer At upper slotted base pipe 4 and lower slotted base pipe 10 slot hole and check valve 8, because upper packing element 5 and lower rubber cylinder 11 set pressure reduction Less than check valve starting differential pressure, so liquid enters slotted base pipe outer wall and upper packing element 5 and lower rubber cylinder 11 inwall from slot hole Between annular region when, when inside and outside differential pressure is more than 1.0mpa, upper packing element 5 and lower rubber cylinder 11 initially set;With infusion liquid The increase of body discharge capacity, in upper slotted base pipe 4, fluid pressure raises, when exceeding upper packing element 5 and lower rubber cylinder 11 sets a section sleeve ring After empty fluid pressure 4.0mpa, check valve 8 is positive to be opened, and liquid packing element 5 and lower rubber cylinder 11 from check valve 8 enters set section Between limited airtight casing annulus region.
5. continue to improve infusion discharge capacity and keep stable, if now well head pump pressure is decreased obviously, this illustrates that this is finely looked for leakage Test Lou on packer packing element 5 and lower rubber cylinder 11 set intersegmental sleeve pipe and leakage occur, be leak source position at this well depth;If now well Mouth pump pressure does not decline, and rises on the contrary, and this illustrates that this finely looks for packing element 5 and lower rubber cylinder 11 on omission of examination leakage packer to set intersegmental sleeve pipe Intact, do not leak.Judge whether this finely looks for packing element 5 and lower rubber cylinder 11 on omission of examination leakage packer to set intersegmental sleeve pipe complete accordingly Whole, pit shaft looks for omission of examination leakage operation, and whether success is effective.
6. complete this prediction well depth position wellbore casing look for the omission of examination leakage operation after, if sleeve pipe does not leak, termination of pumping is let out Pressure, this finely looks for packing element 5 and lower rubber cylinder 11 on omission of examination leakage packer to unseal, upper lifting pipe post 1 ~ 2m.
7. then according to 4,5 two steps carry out other shaft locations and look for omission of examination leakage operation, until completing all of pit shaft design Look for omission of examination blind hole depth position.
8. complete after the old well shaft of Oil/gas Well looks for omission of examination leakage all to work, termination of pumping pressure release, acts this and finely looks for omission of examination leakage envelope Every device tubing string, dismantle this in time and finely look for omission of examination leakage packer, check that this finely looks for omission of examination leakage packing element, check valve 8 feelings Condition, maintains or changes this and finely look for omission of examination leakage packer, subsequently to look for omission of examination leakage operation to use again.

Claims (10)

1. a kind of expanding pressure reduction open finely look for omission of examination leakage packer it is characterised in that: packing element (5) and lower rubber cylinder in inclusion (11), described upper packing element (5) two ends are connected to seat (6) under the packing element seat of honour (3) and upper packing element;Described lower rubber cylinder (11) two End is connected to seat (12) under the lower rubber cylinder seat of honour (9) and lower rubber cylinder;Under described upper packing element seat (6) and the lower rubber cylinder seat of honour (9) it Between connected by unidirectional valve body (7), described unidirectional valve body (7) is provided with check valve (8);It is provided with described upper packing element (5) Upper slotted base pipe (4), is provided with lower slotted base pipe (10) in described lower rubber cylinder (11).
2. a kind of expanding pressure reduction according to claim 1 open finely look for omission of examination leakage packer it is characterised in that: described Check valve (8) includes valve seat (14), spring (15) and valve element (16), and described spring (15) is located at valve seat (14) and valve element (16) Between.
3. a kind of expanding pressure reduction according to claim 1 open finely look for omission of examination leakage packer it is characterised in that: described Lower rubber cylinder under seat (12) lower end be connected with lower contact (13);It is connected with top connection (1) on the described upper packing element seat of honour (3).
4. a kind of expanding pressure reduction according to claim 3 open finely look for omission of examination leakage packer it is characterised in that: described Top connection (1) is tightly connected by sealing ring (2) with the upper packing element seat of honour (3).
5. a kind of expanding pressure reduction according to claim 1 open finely look for omission of examination leakage packer it is characterised in that: described Upper packing element (5) identical with the structure of lower rubber cylinder (11), long 300mm, spacing 1200mm, set pressure reduction 1.0mpa.
6. a kind of expanding pressure reduction according to claim 1 open finely look for omission of examination leakage packer it is characterised in that: described The length direction local of upper slotted base pipe (4) and lower slotted base pipe (10) all has slot, and the long 1.0mm of its slot is wide 0.5mm.
7. a kind of expanding pressure reduction according to claim 1 open finely look for omission of examination leakage packer it is characterised in that: described Upper slotted base pipe (4) and lower slotted base pipe (10) are all using 35crmo materials processing, hardness hb197 ~ 235.
8. a kind of expanding pressure reduction according to claim 1 open finely look for omission of examination leakage packer it is characterised in that: described Upper packing element (5) identical with lower rubber cylinder (11) structure, all using shoulder protection oil resistant hydrogenated nitrile-butadiene rubber.
9. a kind of expanding pressure reduction according to claim 1 open finely look for omission of examination leakage packer it is characterised in that: described Check valve (8) adopts stainless steel material, bore dn06-32, Opening pressure 4.0mpa.
10. a kind of expanding pressure reduction according to claim 1 open finely look for omission of examination leakage packer it is characterised in that: institute State top connection (1) and the button-type of lower contact (13) is 2-7/8 " eue.
CN201610955627.1A 2016-10-27 2016-10-27 Expanding type differential pressure opening type fine leakage finding and leakage checking packer Pending CN106351602A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610955627.1A CN106351602A (en) 2016-10-27 2016-10-27 Expanding type differential pressure opening type fine leakage finding and leakage checking packer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610955627.1A CN106351602A (en) 2016-10-27 2016-10-27 Expanding type differential pressure opening type fine leakage finding and leakage checking packer

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Publication Number Publication Date
CN106351602A true CN106351602A (en) 2017-01-25

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107178363A (en) * 2017-05-26 2017-09-19 中国石油天然气股份有限公司 Casing deformation well Tube-colume for seanching leakage area and its look for leakage technique
CN107313767A (en) * 2017-05-26 2017-11-03 中国石油天然气股份有限公司 Tube-colume for seanching leakage area and its look for leakage process

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Publication number Priority date Publication date Assignee Title
CN101050699A (en) * 2006-12-11 2007-10-10 大庆油田有限责任公司 Method for obtaining thick oil layer vertical permeability using same layer vertical interference test well and test tubular pole
CN201532295U (en) * 2009-11-06 2010-07-21 安东石油技术(集团)有限公司 High pressure clamping seal gas injection leakage checking tool with anti-jumping function
CN201661267U (en) * 2010-03-16 2010-12-01 北京德林伟业工程技术有限责任公司 Plugging packer
US20120000676A1 (en) * 2010-06-30 2012-01-05 Halliburton Energy Services, Inc. Mitigating leaks in production tubulars
CN104453775A (en) * 2014-12-18 2015-03-25 天津汇铸石油设备科技有限公司 Casing checking packer
CN105221100A (en) * 2015-09-21 2016-01-06 西南石油大学 A kind of non-tubing string motion can restting deblocking packer
CN205078222U (en) * 2015-09-08 2016-03-09 中国石油化工股份有限公司 Hourglass packer is looked for to oil well
CN206158664U (en) * 2016-10-27 2017-05-10 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 Meticulous omission of examination hourglass packer of looking for is opened to expanding pressure differential

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101050699A (en) * 2006-12-11 2007-10-10 大庆油田有限责任公司 Method for obtaining thick oil layer vertical permeability using same layer vertical interference test well and test tubular pole
CN201532295U (en) * 2009-11-06 2010-07-21 安东石油技术(集团)有限公司 High pressure clamping seal gas injection leakage checking tool with anti-jumping function
CN201661267U (en) * 2010-03-16 2010-12-01 北京德林伟业工程技术有限责任公司 Plugging packer
US20120000676A1 (en) * 2010-06-30 2012-01-05 Halliburton Energy Services, Inc. Mitigating leaks in production tubulars
CN104453775A (en) * 2014-12-18 2015-03-25 天津汇铸石油设备科技有限公司 Casing checking packer
CN205078222U (en) * 2015-09-08 2016-03-09 中国石油化工股份有限公司 Hourglass packer is looked for to oil well
CN105221100A (en) * 2015-09-21 2016-01-06 西南石油大学 A kind of non-tubing string motion can restting deblocking packer
CN206158664U (en) * 2016-10-27 2017-05-10 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 Meticulous omission of examination hourglass packer of looking for is opened to expanding pressure differential

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107178363A (en) * 2017-05-26 2017-09-19 中国石油天然气股份有限公司 Casing deformation well Tube-colume for seanching leakage area and its look for leakage technique
CN107313767A (en) * 2017-05-26 2017-11-03 中国石油天然气股份有限公司 Tube-colume for seanching leakage area and its look for leakage process
CN107313767B (en) * 2017-05-26 2021-07-02 中国石油天然气股份有限公司 Leakage finding pipe column and leakage finding process method thereof

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Application publication date: 20170125

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