CN202140062U - Hydraulic drilling-free tail pipe suspension packer - Google Patents
Hydraulic drilling-free tail pipe suspension packer Download PDFInfo
- Publication number
- CN202140062U CN202140062U CN201120228110U CN201120228110U CN202140062U CN 202140062 U CN202140062 U CN 202140062U CN 201120228110 U CN201120228110 U CN 201120228110U CN 201120228110 U CN201120228110 U CN 201120228110U CN 202140062 U CN202140062 U CN 202140062U
- Authority
- CN
- China
- Prior art keywords
- hanger
- packer
- seal box
- plug
- pressure
- 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.)
- Expired - Lifetime
Links
- 239000000725 suspension Substances 0.000 title 1
- 239000012530 fluid Substances 0.000 claims abstract description 41
- 238000005553 drilling Methods 0.000 claims abstract description 38
- 238000012856 packing Methods 0.000 claims abstract description 23
- 208000034656 Contusions Diseases 0.000 claims description 17
- 238000007789 sealing Methods 0.000 abstract description 18
- 230000005465 channeling Effects 0.000 abstract description 7
- 239000011440 grout Substances 0.000 abstract 1
- 239000004568 cement Substances 0.000 description 41
- 238000010276 construction Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 210000000056 organ Anatomy 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 210000000664 rectum Anatomy 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The utility model discloses a hydraulic pressure exempts from to bore tail pipe and hangs packer, including feeder, packer and hanger, still include drilling rod plug, suppress pressure ball, hydraulic cylinder, packer packing element assembly, seal box, hanger hydraulic cylinder, hollow sleeve pipe plug and bump the pressure assembly, the hollow sleeve pipe plug sets up at the feeder lower extreme, and the seal box setting is in the hanger, and the seal box fixes in the lower part of feeder, and hydraulic cylinder and packer packing element assembly set up on the hanger, and the hanger hydraulic cylinder is located the hanger lower extreme. The utility model discloses a hydraulic pressure is sat and is hung the realization tail pipe and hang, annotates behind the grout, sits to seal through hydraulic pressure, realizes tail pipe top annular space packing to realize tail pipe annular space fluid and pressure shield, restrain gas channeling and lost circulation, improve well cementation quality and permanent sealing quality.
Description
Technical field
The utility model relate to a kind of be used for well cementation such as oil gas field oil gas well with band hydraulic setting packer exempt to bore extension hanger, belong to the manufacturing technology field of industrial gas oil down-hole cementing tool.
Background technology
In the oilfield drilling process, when carrying out drilling liner cementing, need to use extension hanger to realize sending tail pipe under the drilling rod; And the realization tail pipe is slipped out of the hand and cementing operation; Thereby increase the upper strata casing inner diameter, be convenient to step operation down, simultaneously; Realize practicing thrift sleeve pipe and cementing operation expense, reach the purpose that reduces drilling cost.The extension hanger that generally uses at present has multiple.
Conventional tail pipe hanger: basic function with extension hanger.On the one hand, annotate for during the Hou Ning that puts in place at cement paste, the annular space cement paste is in free state, owing to leakage, has channeling, causes the migration of annular space cement paste, influences the cement sheath quality, possibly form the blowby passage, and final sealing is second-rate, causes the horn mouth gas blowby.On the other hand, the seal box and the sleeve pipe plug holder of little internal diameter arranged in the hanger,, need after the well cementation to bore for guaranteeing latus rectum in the hanger.Simultaneously, for the loss of compensation interval isolation cement paste during Hou Ning, generally to stay cement plug.So, bore twice under needing after the well cementation and fill in, one time brill is gone up cement plug, and the cement plug of brill sedimentation and the annex in the hanger like this, had both injured the annular space cement sheath, influenced the sealing quality, increased drilling period again.
All-pass footpath extension hanger: this hanger seal box generally adopts fixture block to be embedded in the hanger inner body wall; Sleeve pipe plug seat is fixed on the running tool afterbody; Realize that the hanger body has identical latus rectum with sleeve pipe, i.e. all-pass footpath is though can solve the drilling well work of the interior annex of hanger; But still can not solve the influence of leakage, has channeling to the migration of annular space cement paste; Can not guarantee cementing quality, can not solve and bore the drilling well work of going up sedimentation cement plug in cement plug and the hanger that cementing quality and economic benefit are limited.Simultaneously, because seal box is embedded in the hanger inwall through fixture block, the fixture block failure mechanisms takes place easily; Can not in hanger, slip out of the hand smoothly, when the tail pipe tubing string is light, can trip out whole tail pipe tubing string; When the tail pipe tubing string is heavier, can cause running tool, send into drilling tool and can not trip out smoothly, all can cause the Important Project accident; The post-processed difficulty, economic loss is huge.
The extension hanger of band mechanical-set packer: when this hanger is annotated for the cement paste end in the drilling liner cementing construction, press down, start and set packer through the running tool brute force; Realize the mechanical packing between hanger and upper strata sleeve ring; Avoid the pressure transmission and the fluid migration of extension hanger annular space, play preventing has channeling, suppress leakage; Protection annular space cement sheath improves drilling liner cementing sealing quality.Simultaneously, cement sealing and packer acting in conjunction realize the long-lasting of annular space packing, prolong the application life of well.Can not stay cement plug, practice thrift drilling period.But this instrument puts inspection and the construction period that puts on slipping out of the hand carrying out back-off, and strict control is wanted in operation; Downforce must not reach the startup downforce of packer, must not start packer, otherwise; To cause packer setting; Cement paste can't inject, and can not carry out cementing operation, causes bigger engineering accident.For deep-well, ultradeep well, big gradient and horizontal well etc., the drilling tool frictional resistance is bigger, carry out the success or not of hanger back-off on put and put inspection when judging; Will accurately control downforce, difficulty is very big, so; This type hanging packer is generally used in the better simply well of hole condition, and for the well of complex hole condition such as deep-well, ultradeep well, application risk is bigger; So use lessly, the superiority of hanging packer fails in engineering application, fully to be represented.
In sum, existing extension hanger be with mechanical-set extension hanger, can not fully satisfy the scene needs.
Summary of the invention
The purpose of the utility model is to overcome the problems referred to above that existing extension hanger exists, and provides a kind of hydraulic pressure to exempt to bore tail tube hanging packer, and the utility model is sat to hang through hydraulic pressure and realized tail tube hanging; Annotate for behind the cement paste; Through hydraulic setting, realize tail pipe top annular space packing, thereby realize tail pipe annular fluid and pressure shielding; Suppress has channeling and leakage, improve cementing quality and permanent mounting quality.
For realizing above-mentioned purpose, the technical scheme that the utility model adopts is following:
A kind of hydraulic pressure exempts to bore tail tube hanging packer; Comprise and send into device, packer and hanger, it is characterized in that: also comprise the drilling rod plug, the ball that builds the pressure, fluid cylinder, packing element assembly, seal box, hanger fluid cylinder, hollow bushing plug and bruising assembly, said hollow bushing plug is arranged on sends into the device lower end; Seal box is arranged in the hanger; And seal box is fixed on the bottom of sending into device, and fluid cylinder and packing element assembly are arranged on the hanger, and the hanger fluid cylinder is positioned at the hanger lower end.
Said fluid cylinder is arranged on the hanger through the elasticity lock ring.
Said hanger and hanger fluid cylinder are sat the extension shear pin through hanger and are fixed.
Said hollow bushing plug is connected the lower end of sending into device through the plug shear pin of slipping out of the hand.
Said seal box is two, comprises first seal box on top and second seal box of first seal box below.
Adopt the advantage of the utility model to be:
One, the utility model is sat to hang through hydraulic pressure and is realized tail tube hanging, annotates for behind the cement paste, through hydraulic setting; Realize tail pipe top annular space packing; Thereby realize the shielding of tail pipe annular fluid and pressure, suppress has channeling and leakage, improve cementing quality and permanent mounting quality.
Two, in the utility model, the hollow bushing plug is connected the lower end of sending into device through the plug shear pin of slipping out of the hand, and seal box is installed in the bottom of sending into device, during construction; Plug is slipped out of the hand, and after the construction, sends into device and trips out; Need not to bore annex in the hanger, the realization hanger exempts to bore, and is easy to operate.
Three, in the utility model, the hanger fluid cylinder is positioned at the hanging packer bottom, is in below the flexible sealing box, is in to send into organ pipe internal pressure system, is convenient to hanging packer and sits extension.
Four, in the utility model, seal box is fixed on the bottom of sending into device, and the outer rim of seal box and hanging packer inwall interference fit realize the sealing with the hanging packer inwall; Seal box is with sending into that device rotates and when up and down, with the favorable sealing property of hanging packer inwall, two seal boxes have improved the reliability of sealing in hanger, and after seal box extracts the hanging packer inwall; Can insert again, still can guarantee the sealing, for stub liner, when tail pipe very light; Can't judge back-off whether during success through suspending weight, submit into device on can be fully, extract hanging packer to the flexible sealing box, turn on pump; The anti-circulation, circulation is normal, and the back-off success then is described, and tail pipe is slipped out of the hand; If can not instead circulate, explain that then back-off is unsuccessful, tail pipe is not slipped out of the hand, and judges easily.
Five, in the utility model, fluid cylinder, packing element assembly are positioned at the hanger middle and upper part, and are positioned at flexible sealing box top; When the drilling liner cementing construction finishes; All be in inside and outside the fluid cylinder and send into outside the organ pipe, be i.e. hanging packer pipe external pressure system, the inside and outside no pressure reduction of fluid cylinder; Can not cut off and set shear pin, can not cause the packer mistake to set accident.
Six, in the utility model, when annotating for the cement paste end, drilling rod plug and hollow bushing plug are compound, and the hollow bushing plug is slipped out of the hand; And with the bruising of bruising assembly, connect kelly bar this moment, suppresses interior pressure (pressure be enough to cut off set shear pin), submits into device on slowly; Link up the fluid cylinder inner chamber and send into the organ pipe internal pressure, cut off and set shear pin, set packer is realized the permanent mechanical packing of hanger and outer layer sleeve; Can bear the annular space bidirection press, after the packing element assembly sets, when the high pressure formation fluid gets into cement paste; The casing annulus fluid volume increases, and controlled by packer, and annular pressure increases; Can resist it and continue to get into, and then scurry on the control fluid, avoid cement paste to scurry groove; When the low pressure lost-circulation zone was missed, the casing annulus fluid volume reduced, and controlled by packer, and annular pressure reduces, and suppressed it and continued leakage, prevented superposition section cement paste disappearance; During circulation superfluous water mud, avoid circulating pressure to act on low-pressure stratum, press and leak the stratum; During the Hou Ning, when cement paste is weightless, prevent that the stratum from can not press surely, therefore fundamentally guaranteed effective formation of drilling liner cementing cement sheath, simultaneously,, ensured permanently effective drilling liner cementing sealing quality with the mechanical packing acting in conjunction of packer.
Seven, the utility model carries out drilling liner cementing, when annotating for the cement paste end, connects kelly bar and builds the pressure, slowly the upper lifting pipe post; Set packer is realized tailpipe section annular space cement paste and pressure shielding, and after sending into device and extracting hanger, promptly turn on pump circulates; Wash out unnecessary cement paste and mix slurry,, can be placed in the bruising assembly below the artificial bottom of a well in advance, thereby realize the both supreme cement plug of drilling liner cementing for the completion tail pipe; Also do not have following cement plug, also anhydrous mud is starched with mixing in hanging packer and the tail pipe, after cement paste solidifies; Do not need drilling well in the pipe, can realize finishing drilling, novel structure after the well cementation; Both can guarantee the cementing quality of complicated wells such as high-pressure gas well, easy absorption well, can practice thrift drilling time again, create good economic benefit.
Description of drawings
Fig. 1 is the utility model top structural representation
Fig. 2 is the lower part structural representation of integral body for the utility model and top
Be labeled as among the figure: 1, drilling rod plug, 2, the ball that builds the pressure, 3, send into device, 4, set shear pin; 5, fluid cylinder, 6, the elasticity lock ring, 7, the packing element assembly; 8, seal box, 9, the hanger fluid cylinder, 10, hanger sits and hang shear pin; 11, the plug shear pin of slipping out of the hand, 12, the hollow bushing plug, 13, the bruising assembly.
The specific embodiment
A kind of hydraulic pressure exempts to bore tail tube hanging packer; Comprise and send into device, packer and hanger that also comprise the drilling rod plug, the ball that builds the pressure, fluid cylinder, packing element assembly, seal box, hanger fluid cylinder, hollow bushing plug and bruising assembly, said hollow bushing plug is arranged on sends into the device lower end; Seal box is arranged in the hanger; And seal box is fixed on the bottom of sending into device, and fluid cylinder and packing element assembly are arranged on the hanger, and the hanger fluid cylinder is positioned at the hanger lower end.
In the utility model, said fluid cylinder is arranged on the hanger through the elasticity lock ring.Said hanger and hanger fluid cylinder are sat the extension shear pin through hanger and are fixed.Said hollow bushing plug is connected the lower end of sending into device through the plug shear pin of slipping out of the hand.The outer rim of said seal box and hanger inwall interference fit, flexible sealing box 8 is at hanging packer inwall movable sealing.Said seal box is two, comprises first seal box on top and second seal box of first seal box below.Said hanger fluid cylinder is positioned at first seal box below.
The utility model mainly by drilling rod plug 1, the ball 2 that builds the pressure, send into device 3, set shear pin 4, fluid cylinder 5, elasticity lock ring 6, packing element assembly 7, flexible sealing box 8, hanger fluid cylinder 9, hanger sit and hang slip out of the hand shear pin 11, hollow bushing plug 12, bruising assembly 13 etc. of shear pin 10, plug and form.When using this hanging packer to carry out drilling liner cementing, bruising assembly 13 times below the artificial bottom of a well, the upper end of following cement plug, under the hanging packer more than the casing shoe of upper strata sleeve pipe.After delivering to the position under the tubing string, drop into the ball 2 that builds the pressure, treat that it arrives bruising assembly 13 after, build the pressure, cut off to sit and hang shear pin 4, hanger fluid cylinder 9 is up, realizes that the seat of tail tube hanging packer is hung.Just passing on then into device 3 back-offs, after the back-off number of turns was enough, put-on and delegated was sent into device 3 and is judged the back-off success or not; For stub liner, adopt put-on and delegated to send into device 3 and be not sure of back-off whether during success, submit into device on can be fully; More than the last raising degree 4m, turn on pump, the anti-circulation; It is unimpeded to circulate, then back-off success.After confirming the back-off success,, carry out the tail pipe cementing practice, when cement paste has been annotated, drop into drilling rod plug 1 sending into the bottom that device 3 is inserted into hanging packer; Replace into mud, drilling rod plug 1 is compound with hollow bushing plug 12, cuts off the plug shear pin 11 of slipping out of the hand, when cement paste is annotated when putting in place; Drilling rod plug 1 and Compounded rubber plug and 13 bruisings of bruising assembly that hollow bushing plug 12 forms connect kelly bar then, and build the pressure (be enough to cut off set shear pin 4), slow having gone up sent into device 3; Move on the flexible sealing box 8, link up the pressure of sending into device 3 and fluid cylinder 5 inner chambers, cut off and set shear pin 4, fluid cylinder 5 is descending; Realize that packing element assembly 7 sets and the annular space packing, continue to pull out of hole that flexible sealing box 8 breaks away from the hanging packer inwall, pressure descends; Outlet return of drilling mud, the turn on pump circulation washes out unnecessary cement paste and mixes slurry, carries out cement paste Hou Ning then.
The utility model is used for the oil gas field drilling liner cementing, and particularly the drilling liner cementing of complex hydrocarbon such as high-pressure gas well, low-pressure absorption well well is sat extension through hydraulic pressure and realized tail tube hanging; Annotate for behind the cement paste; Through hydraulic setting, realize tail pipe top annular space packing, thereby realize tail pipe annular fluid and pressure shielding; Suppress has channeling and leakage, improve cementing quality and permanent mounting quality.The hanging packer inside of the utility model need not to bore annex, can not stay cement plug, practices thrift and bores the plug time.
The operating principle of the utility model is following: during the completion drilling liner cementing, be connected on bruising assembly 13 below the artificial bottom of a well, can realize that after the well cementation be completion.During well cementation, bruising assembly 13 times below the artificial bottom of a well, deliver to the position under the drilling liner cementing tubing string after, throw the ball 2 that builds the pressure, treat that it arrives bruising assembly 13 after, build the pressure; Cut off to sit and hang shear pin 4, sit and hang, just passing on into instrument 3 back-offs, drilling rod plug 1 is thrown in cementing; For mud, drilling rod plug 1 is compound with hollow bushing plug 12, when cement paste when putting in place, with 13 bruisings of bruising assembly, connect kelly bar then; Build the pressure, slowly gone up running tool 3, link up the pressure of running tool 3 and fluid cylinder 5 inner chambers, cut off and set shear pin 4, realize that packing element assembly 7 sets; Continue to pull out of hole, set up circulation canal, circulation washes out unnecessary cement paste and mixes slurry, carries out cement paste Hou Ning then.
Claims (5)
1. a hydraulic pressure exempts to bore tail tube hanging packer; Comprise and send into device, packer and hanger, it is characterized in that: also comprise the drilling rod plug, the ball that builds the pressure, fluid cylinder, packing element assembly, seal box, hanger fluid cylinder, hollow bushing plug and bruising assembly, said hollow bushing plug is arranged on sends into the device lower end; Seal box is arranged in the hanger; And seal box is fixed on the bottom of sending into device, and fluid cylinder and packing element assembly are arranged on the hanger, and the hanger fluid cylinder is positioned at the hanger lower end.
2. hydraulic pressure according to claim 1 exempts to bore tail tube hanging packer, it is characterized in that: said fluid cylinder is arranged on the hanger through the elasticity lock ring.
3. hydraulic pressure according to claim 1 and 2 exempts to bore tail tube hanging packer, it is characterized in that: said hanger and hanger fluid cylinder are sat the extension shear pin through hanger and are fixed.
4. hydraulic pressure according to claim 1 and 2 exempts to bore tail tube hanging packer, it is characterized in that: said hollow bushing plug is connected the lower end of sending into device through the plug shear pin of slipping out of the hand.
5. hydraulic pressure according to claim 1 and 2 exempts to bore tail tube hanging packer, it is characterized in that: said seal box is two, comprises first seal box on top and second seal box of first seal box below.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120228110U CN202140062U (en) | 2011-06-30 | 2011-06-30 | Hydraulic drilling-free tail pipe suspension packer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120228110U CN202140062U (en) | 2011-06-30 | 2011-06-30 | Hydraulic drilling-free tail pipe suspension packer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202140062U true CN202140062U (en) | 2012-02-08 |
Family
ID=45551123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120228110U Expired - Lifetime CN202140062U (en) | 2011-06-30 | 2011-06-30 | Hydraulic drilling-free tail pipe suspension packer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202140062U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104358539A (en) * | 2014-11-18 | 2015-02-18 | 盐城市森鑫石油机械有限公司 | Small sleeve drilling liner cementing device for reforming old well and abandoned well in old oil region of oil field |
| CN113622865A (en) * | 2021-08-26 | 2021-11-09 | 中海石油(中国)有限公司 | Tail pipe pressure control well cementation method under packer setting condition |
| CN114961636A (en) * | 2022-06-21 | 2022-08-30 | 中煤科工集团重庆研究院有限公司 | Fixed-point grouting and sealing method for complex structural stratum of underground coal mine |
-
2011
- 2011-06-30 CN CN201120228110U patent/CN202140062U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104358539A (en) * | 2014-11-18 | 2015-02-18 | 盐城市森鑫石油机械有限公司 | Small sleeve drilling liner cementing device for reforming old well and abandoned well in old oil region of oil field |
| CN113622865A (en) * | 2021-08-26 | 2021-11-09 | 中海石油(中国)有限公司 | Tail pipe pressure control well cementation method under packer setting condition |
| CN114961636A (en) * | 2022-06-21 | 2022-08-30 | 中煤科工集团重庆研究院有限公司 | Fixed-point grouting and sealing method for complex structural stratum of underground coal mine |
| CN114961636B (en) * | 2022-06-21 | 2023-09-01 | 中煤科工集团重庆研究院有限公司 | Fixed-point grouting sealing method for underground complex-structure stratum of coal mine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103015955B (en) | Open-hole horizontal well multi-cluster sliding sleeve staged fracturing string and fracturing method thereof | |
| CN102953698B (en) | A kind of expansion-type rotatable tail pipe hanger | |
| CN101614117B (en) | Expansion pipe type tail pipe hanger | |
| CN202194613U (en) | Hydraulic drilling-free suspension packer | |
| CN107701121B (en) | Exempt to bore and exempts to fish out solid completion integral tubing string | |
| CN201705219U (en) | Lateral drilling gravel pack completion string | |
| CN201460778U (en) | Expansion pipe type tail pipe hanger | |
| CN103835677B (en) | A kind of horizontal well two-stage sealing bruising salvagable completion system | |
| CN108266173A (en) | A kind of method for being segmented transformation completion | |
| CN107387006A (en) | Running tool and the large diameter hanger for being provided with the running tool | |
| CN202140062U (en) | Hydraulic drilling-free tail pipe suspension packer | |
| CN101285375A (en) | Sleeve expanding method for horizontal well | |
| CN204327042U (en) | Cementing plug bruising positioner | |
| CN103573226B (en) | A kind of completion and sand control technique and sand control pipe thereof | |
| CN103306636B (en) | A kind of completion tubular string and cemented method | |
| CN103628834B (en) | Locking type expansion liner hanger | |
| CN202832323U (en) | Locking type expansion liner hanger | |
| CN206917631U (en) | Can bore can drag for the anti-pollution packer of horizontal well | |
| CN201778750U (en) | Suspension fracturing packer | |
| CN101187300B (en) | Rotary hydraulic machinery double function expansion type tail pipe hanger | |
| CN103206191B (en) | Viscous crude drilling liner cementing squeezes and alters integrated method | |
| CN101280674B (en) | Oil well cementing system with inverse squeezing and pouring functions | |
| CN201225121Y (en) | Oil gas well selective completion tool | |
| CN109989725A (en) | Exempt from brill formula blind plate and exempts to bore plug well shaft fixing technology | |
| CN207420469U (en) | Exempt to bore and exempt to drag for solid completion integral tubing string |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120208 |