CN104929603B - Infinite stage sectional fracturing method for casing - Google Patents
Infinite stage sectional fracturing method for casing Download PDFInfo
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- CN104929603B CN104929603B CN201510307413.9A CN201510307413A CN104929603B CN 104929603 B CN104929603 B CN 104929603B CN 201510307413 A CN201510307413 A CN 201510307413A CN 104929603 B CN104929603 B CN 104929603B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000004576 sand Substances 0.000 claims abstract description 11
- 230000008878 coupling Effects 0.000 claims abstract description 7
- 238000010168 coupling process Methods 0.000 claims abstract description 7
- 238000005859 coupling reaction Methods 0.000 claims abstract description 7
- 238000005488 sandblasting Methods 0.000 claims description 19
- 238000010276 construction Methods 0.000 abstract description 17
- 241000239290 Araneae Species 0.000 description 10
- 238000012856 packing Methods 0.000 description 9
- 238000003825 pressing Methods 0.000 description 9
- 210000002445 nipple Anatomy 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000002929 anti-fatigue Effects 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Earth Drilling (AREA)
Abstract
The invention discloses a casing infinite stage sectional fracturing method, which comprises the following steps: 1) setting a casing and cementing a tubular column; 2) a service tool is put to the bottom of the artificial well; 3) lifting the continuous oil pipe, and positioning the bottommost layer infinite sliding sleeve by using a mechanical coupling positioner; 4) setting the repeatable setting and unsealing tool in the bottommost infinite sliding sleeve and between the upper through hole and the lower through hole; 5) fracturing; after the repeatable setting and unsealing tool is completely set, annular pressure is applied to push the piston to move downwards and clamp the piston on the locking ring, the infinite sliding sleeve is opened, and sand fracturing is performed; 6) after fracturing is completed, lifting the coiled tubing, and unsealing the repeatable setting and unsealing tool; 7) sequentially positioning the infinite sliding sleeves 2 upwards by using the method in the step 3); 8) and repeating the steps 4) to 7) until the fracturing of the whole well section is completed. The method can greatly shorten the construction period, improve the fracturing efficiency and reduce the construction cost.
Description
Technical field
The present invention relates to oil-drilling field, more particularly to a kind of sleeve pipe infinite stages staged fracturing method.
Background technology
Increasing with domestic horizontal well development, staged fracturing of horizontal well technology has been increasingly becoming horizontal well development mistake
Major technique in journey, is in general divided into barefoot completion and cased hole completion.What cased-hole applications were more at present is motionless pipe
Post hydrajetting techniques, water-jet bridging plug packing sleeve pipe fracturing technique and coiled tubing band underseal abrasive perforating staged fracturing skill
Art.Fixed tubular column hydrajetting techniques connect hydraulic sand blasting instrument by oil pipe and enter well, open sliding sleeves at different levels by pitching and realize
Multistage pressure break.The main pressure break of sleeve pipe is generally used, oil pipe fluid infusion mode is constructed.Because oil jacket annular clearance is smaller, construction pressure
Power is high, it is impossible to meet massive hydraulic fracture needs.Meanwhile, using pitching unfolding mode by casing size and ball and the differential limit of ball seat
System, the pressure break number of plies is limited.Water-jet bridging plug packing sleeve pipe fracturing technique insulates fractured interval by setting bridging plug first, then
Pitching opens hydrajet tool and completes many cluster perforating jobs.This technique uses casing fracturing, can not only realize larger rule
The pressing crack construction of mould, can also carry out multiple perforation, but once enter to carry out one layer of pressing crack construction down, it is necessary to repeatedly rise
Lower bridging plug and replacing hydrajet tool, long construction period.After pressure break terminates, in addition it is also necessary under enter to bore plug instrument bore mill bridging plug, apply
Work complex process.After coiled tubing band underseal abrasive perforating staged fracturing technology is positioned using mechanical collar locator, lead to
Cross hydrajet tool and penetrate out sleeve pipe, annular space carries out huge discharge sand fracturing.Due to needing to carry out multiple perforation, to spray tip
Wearability and anti-backwash nocuity can require higher., it is necessary to replace perforating fluid after perforation terminates, the activity duration is added.
The content of the invention
In order to solve the above-mentioned technical problem, the present invention provides a kind of sleeve pipe infinite stages staged fracturing method and solves prior art
The pressure break number of plies is limited, long construction period, and the defect high to equipment requirement greatly shortens construction period, improves pressure break efficiency and drop
Low construction cost.
Therefore, technical scheme is as follows：
A kind of sleeve pipe infinite stages staged fracturing method, comprises the following steps：
1) setting of casing well cementation tubing string；Described sleeve pipe well cementation tubing string include from shaft bottom to well head set float shoe, float collar and
The spaced more piece sleeve pipe of horizontal segment and multiple infinite stages sliding sleeves, near well head at be provided that sleeve pipe and its always from water
Flat section extends to well head；Two short sleeves are further respectively had between the single infinite stages sliding sleeve and sleeve pipe；
2) service aid is to artificial bottom of a well under；The service aid is is connected to coiled tubing lower end, from top to bottom successively
The jointing of connection, give up, centralizer, hydrajet tool, reverse circulation valve, repeat setting unsealing tool, mechanical box cupling
Locator and seeker；
3) coiled tubing is above carried to position bottom infinite stages sliding sleeve；The mechanical collar locator is by connecting
Load fluctuation can be produced when connecing at the casing coupling of short sleeve, determines whether the service aid is in the bottom by load fluctuation
The position of infinite stages sliding sleeve；
4) to repeat setting unsealing tool setting in the bottom infinite stages sliding sleeve by described, and between upper and lower logical
Between hole；The infinite stages sliding sleeve includes top connection, central tube, piston, lock ring, outer barrel, adapter sleeve and lower contact, the center
Pipe upper end is caught in top connection, and both longitudinal correspondence positions are equipped with sandblasting hole；The outer barrel upper end passes through screw thread and top connection
Connection, lower end is connected by adapter sleeve with lower contact；Withstand central tube in the lower contact top；The outer barrel and the company of top connection
Socket part position card has lock ring, and lock ring is held out against by outer barrel；The outer surface of piston is provided with pawl, can be stuck on the lock ring, prevents from living
Retreated after plug is descending；The cavity volume for accommodating piston is formed between the central tube and top connection and outer barrel；The piston is by cutting
Nail, which is fixed between central tube and top connection, closes sandblasting hole, and the length of piston is less than the cavity volume bottom to the sandblasting hole
The length of lower edge；The piston does not leave space when fixing with being in contact at the top of the cavity volume, the central tube pair
The position in the space is answered to be provided with upper through hole；The central tube is provided with lower through-hole on the downside of the cavity volume；
5) pressure break；After the repeatable setting unsealing tool is completely setting, annular space is suppressed, and pressure is acted on by upper through hole
The upper surface of piston, lower through-hole will not act on the lower end of piston due to the packing for repeating setting unsealing tool, pressure
Face, the pressure difference of the piston upper and lower end face cuts shear pin, and descent of piston is simultaneously stuck on lock ring, in the top connection and central tube
Sandblasting hole connection so that establish with stratum link up passage；Sand fracturing；
6) treat after the completion of pressure break, above carry the coiled tubing, unseal the repeatable setting unsealing tool；
7) utilize step 3) method, infinite stages sliding sleeve is positioned upwards successively；
8) repeat step 4)~7), until full well section pressure break is completed.
The structure for repeating setting unsealing tool is shown in patent CN204024574U disclosures, is mainly used for beating
Open infinite stages sliding sleeve and insulate non-fractured interval.Its structure is to include：Central tube and the spacer ring being sequentially arranged on central tube,
Packing element, centrum, slips, slip spider, centralizer seat, slip ring sheath, slip ring and sliding block, be provided with central tube bottom nipple and
Lower contact, central tube threaded upper ends connect a upper instrument, and the spacer ring, packing element and centrum are enclosed within central tube, and centrum is in
The step formed on heart pipe is spacing；The slip spider, centralizer seat, slip ring sliding sleeve and lower contact are sequentially connected and led to by screw thread
Cross sliding block to be connected on central tube, the track by being easy to sliding block to slide up and down is formed on central tube, at the center of the slideway end
Position limiting structure is formed with pipe；Multiple slips central tube be circumferentially mounted on slip spider and by be arranged on slip spider and
The first spring between slips is fixed；Multiple wiper blocks are circumferentially disposed on centralizer seat, the upper and lower ends of wiper block
Spacing by slip spider lower end and baffle ring respectively, wiper block is fixed by its second spring between centralizer seat；The slip ring
It is arranged in slip ring sheath and fixed by centralizer seat, the sliding block is arranged on slip ring；The nipple is located in lower contact,
And be threadedly coupled with central tube lower end, it can be relatively moved between nipple and lower contact.
First step is provided with the top of the lower contact, center bottom of the tube is provided with second matched with the first step
Rank, first step holds out against second step.
If some infinite stages sliding sleeve can not be opened normally, i.e., described top connection can not be connected with the sandblasting hole on central tube
When, service aid is above carried to the sleeve pipe for the infinite stages sliding sleeve upper end that can not normally open, by repeatable setting unsealing tool
Setting in sleeve pipe, avoiding, casing coupling is carried out to sleeve pipe plus sand blasting is penetrated, and sleeve pipe is penetrated out into rear annular space carries out sand fracturing；Complete
Afterwards, a upper infinite stages sliding sleeve is repositioned, step 5 is carried out)~8).
Compared with prior art, the present invention has the following effects that：
1st, casing cementing pressing crack construction conventional at present needs to carry out perforation to sleeve pipe, requires higher to perforating apparatus, often
The fracturing process occurred in the situation that pressure break is not opened after perforation, the present invention need not carry out perforation construction, by the way that packer is sat
Envelope can link up stratum progress pressure break with suppressing opening sliding sleeve from annular space in sliding sleeve.
2nd, the present invention is using a kind of repeatable fracturing packer for setting, unsealing.Packing element setting force is low, using coiled tubing
Packing element can be set by pushing, and meet higher operation pressure.Packing element anti-fatigue performance is strong, can repeatedly be set, unsealed by switching tracks.
3rd, the pressing crack construction of different layers position is realized by opening sliding sleeve, the layer transition time is short, opens efficiency high.Pressure break knot
Operating tool string acts ground in Shu Hou, well, it is ensured that the full-bore in well.
4th, when sliding sleeve is not opened, abrasive perforating is carried out using hydrajet tool, it is ensured that each layer can smoothly enter
Row pressing crack construction.
In summary, the present invention by it is repeatable set, deblocking packer opens well cementation sliding sleeve and carries out pressing crack construction step by step
Method, can as needed under enter sliding sleeve, due to not limiting the series of pressure break, larger pressure break scale needs can be met, contract
In the short pressing crack construction cycle, production cost is reduced, there is positive effect for improving oil gas field recovery ratio.
Brief description of the drawings
Fig. 1 is casing cementing tubular column structure schematic diagram；
Fig. 2 is structure chart when infinite stages sliding sleeve is closed；
Fig. 3 is structure chart when infinite stages sliding sleeve is opened；
Fig. 4 is that service aid opens infinite stages sliding sleeve schematic diagram.
Embodiment
The technical scheme of invention is described in detail below in conjunction with the drawings and specific embodiments.
Infinite stages sliding sleeve 2 includes top connection 201, central tube 202, piston 209, lock ring 210, outer barrel 203, adapter sleeve 206
With lower contact 205, the upper end of central tube 202 is caught in top connection 201, and both longitudinal correspondence positions are equipped with sandblasting hole 213；
The upper end of outer barrel 203 is connected by screw thread with top connection 201, and lower end is connected by adapter sleeve 206 with lower contact 205；It is described
Withstand central tube 202 in the top of lower contact 205；The outer barrel 203 and the connecting portion card of top connection 201 have lock ring 210；The work
209 outer surfaces are filled in provided with pawl, can be stuck on the lock ring 210, are retreated after preventing piston 209 descending；The central tube 202 with
The cavity volume 212 for accommodating piston 209 is formed between top connection 201 and outer barrel 203；The piston 209 is fixed on by shear pin 211
Between central tube 202 and top connection 201, sandblasting hole 213 is closed, and the length of piston 209 is less than the bottom of cavity volume 212 to institute
State the length of the lower edge of sandblasting hole 213；Space, the correspondence of central tube 202 space are left in top when the piston 209 is fixed
Position be provided with upper through hole 207；The central tube 202 is provided with lower through-hole 208 in the downside of cavity volume 212.The lower contact 205
Top is provided with first step, and the bottom of central tube 202 is provided with the second step that matches with the first step, and first step is by the
Two steps are held out against.
Tubing string cement the well including the float shoe 4 set from shaft bottom to well head, float collar 3 and in the spaced more piece sleeve pipe of horizontal segment
1 and multiple infinite stages sliding sleeves 2, near well head at be provided that sleeve pipe 1 and it extends to well head from horizontal segment always；The list
Two short sleeves 12 are further respectively had between individual infinite stages sliding sleeve 2 and sleeve pipe 1.
Service aid is is connected to the lower end of coiled tubing 5, the jointing 6 being sequentially connected from top to bottom, 7, righting of giving up
Device 8, hydrajet tool 9, reverse circulation valve 10, repeatable setting unsealing tool 11, mechanical collar locator 13 and seeker 15.
The structure for repeating setting unsealing tool is shown in patent CN204024574U disclosures, is mainly used for opening nothing
Limit level sliding sleeve and insulate non-fractured interval.Its structure is to include：Central tube and the spacer ring being sequentially arranged on central tube, glue
Cylinder, centrum, slips, slip spider, centralizer seat, slip ring sheath, slip ring and sliding block, nipple is provided with central tube bottom with
Joint, central tube threaded upper ends connect a upper instrument, and the spacer ring, packing element and centrum are enclosed within central tube, and centrum is by center
The step formed on pipe is spacing；The slip spider, centralizer seat, slip ring sliding sleeve and lower contact are sequentially connected and passed through by screw thread
Sliding block is connected on central tube, and the track by being easy to sliding block to slide up and down is formed on central tube, in the central tube of the slideway end
On be formed with position limiting structure；Multiple slips are circumferentially mounted on slip spider and by being arranged on slip spider and card in central tube
The first spring between watt is fixed；Multiple wiper blocks are circumferentially disposed on centralizer seat, the upper and lower ends point of wiper block
Not spacing by slip spider lower end and baffle ring, wiper block is fixed by its second spring between centralizer seat；The slip ring is set
Put in slip ring sheath and fixed by centralizer seat, the sliding block is arranged on slip ring；The nipple is located in lower contact, and
It is threadedly coupled, can be relatively moved between nipple and lower contact with central tube lower end.
A kind of sleeve pipe infinite stages staged fracturing method, comprises the following steps：
1) setting of casing well cementation tubing string；
2) service aid is to artificial bottom of a well under；Depth of setting can be checked by preset positioning short sleeve in well；
3) coiled tubing 5 is above carried to position bottom infinite stages sliding sleeve 2；The mechanical collar locator 13 is passed through
Load fluctuation can be produced when crossing at the casing coupling 14 of connection short sleeve 12, whether the service aid is determined by load fluctuation
In the position of bottom infinite stages sliding sleeve 2；
4) to repeat setting unsealing tool 11 setting in the bottom infinite stages sliding sleeve 2 by described, and between upper
207th, between lower through-hole 208；
5) pressure break；After the repeatable setting unsealing tool 11 is completely setting, annular space is suppressed, and pressure passes through upper through hole 207
The upper surface of piston 209 is acted on, then promotes piston 209 descending and is stuck on lock ring 210, the top connection 201 and center
Sandblasting hole 213 on pipe 202 is connected, so as to establish the passage linked up with stratum；Sand fracturing；
6) treat after the completion of pressure break, above carry the coiled tubing 5, unseal the repeatable setting unsealing tool 11；
7) utilize step 3) method, infinite stages sliding sleeve 2 is positioned upwards successively；
8) repeat step 4)~7), until full well section pressure break is completed.
If some infinite stages sliding sleeve 2 can not be opened normally, i.e., the sandblasting hole in described top connection 201 and central tube 202
213 when can not connect, and service aid above be carried to the sleeve pipe 1 for the upper end of infinite stages sliding sleeve 2 that can not normally open, will be repeatable
Setting unsealing tool 11 is setting, and in sleeve pipe 1, avoiding, casing coupling 14 is carried out to sleeve pipe 1 plus sand blasting is penetrated, and sleeve pipe 1 is penetrated out into rear ring
Sky carries out sand fracturing；After the completion of, a upper infinite stages sliding sleeve is repositioned, step 5 is carried out)~8).
When there is sand plug or sand is buried, it can use and just wash and two kinds of well-flushing modes of backwash.When just washing, liquid is from continuous oil
It is pumped into and is flowed out through hydrajet tool nozzle in pipe, is discharged after being cleaned to sleeve pipe sand setting from sleeve gate.Due to reacting cycle
Ball sealer closure in valve top connection, liquid can not be discharged through the backwash hole on reverse circulation valve outer barrel.During backwash, liquid is from sleeve pipe
It is pumped into, enters coiled tubing by the backwash hole on reverse circulation valve.Because the ball sealer in reverse circulation valve top connection does not rise now
Effect, liquid can be discharged from this after entering coiled tubing from coiled tubing.
The sleeve pipe infinite stages staged fracturing method of the present invention is to will be equipped with mechanical collar locator and repeatable setting deblocking
The fracturing string of instrument is by the way that in coiled tubing G.I.H sleeve pipe, infinite stages sliding sleeve is opened using the positioning of mechanical collar locator
Pressing crack construction is carried out, pressure break well section is insulated using repeatable setting unsealing tool.Due to not limiting the series of pressure break, Ke Yiman
The larger pressure break scale of foot needs, and shortens the pressing crack construction cycle, reduces production cost, has for improving oil gas field recovery ratio
Positive effect.
Claims (3)
1. a kind of sleeve pipe infinite stages staged fracturing method, it is characterised in that comprise the following steps：
1) setting of casing well cementation tubing string；Described sleeve pipe well cementation tubing string include from shaft bottom to well head set float shoe (4), float collar (3) and
In the spaced more piece sleeve pipe (1) of horizontal segment and multiple infinite stages sliding sleeves (2), near well head at be provided that sleeve pipe (1)
And it extends to well head from horizontal segment always；Further respectively had between the single infinite stages sliding sleeve (2) and sleeve pipe (1) two short
Sleeve pipe (12)；
2) service aid is to artificial bottom of a well under；The service aid connects successively from top to bottom to be connected to coiled tubing (5) lower end
The jointing (6) that connects, give up (7), centralizer (8), hydrajet tool (9), reverse circulation valve (10), repeat setting deblocking
Instrument (11), mechanical collar locator (13) and seeker (15)；
3) coiled tubing (5) is above carried to position bottom infinite stages sliding sleeve (2)；The mechanical collar locator (13)
Through connection short sleeve (12) casing coupling (14) place when can produce load fluctuation, the service aid is determined by load fluctuation
Whether the position of bottom infinite stages sliding sleeve (2) is in；
4) it is the repeatable setting unsealing tool (11) is setting in the bottom infinite stages sliding sleeve (2), and between upper and lower
Between through hole (207,208)；The infinite stages sliding sleeve (2) includes top connection (201), central tube (202), piston (209), lock ring
(210), outer barrel (203), adapter sleeve (206) and lower contact (205), central tube (202) upper end are caught in top connection (201),
And both longitudinal correspondence positions are equipped with sandblasting hole (213)；Outer barrel (203) upper end is connected by screw thread and top connection (201)
Connect, lower end is connected by adapter sleeve (206) with lower contact (205)；Withstand central tube (202) in lower contact (205) top；Institute
Stating outer barrel (203) and the connecting portion card of top connection (201) has lock ring (210)；Piston (209) outer surface is provided with pawl,
It can be stuck on the lock ring (210), be retreated after preventing piston (209) descending；The central tube (202) and top connection (201) and
The cavity volume (212) for accommodating piston (209) is formed between outer barrel (203)；The piston (209) is fixed on by shear pin (211)
Between central tube (202) and top connection (201), the sandblasting hole (213) is closed, and the length of piston (209) is less than described hold
Length of chamber (212) bottom to the sandblasting hole (213) lower edge；Space is left at top when the piston (209) is fixed, it is described in
The position in heart pipe (202) the correspondence space is provided with upper through hole (207)；The central tube (202) is on the downside of the cavity volume (212)
Provided with lower through-hole (208)；
5) pressure break；After the repeatable setting unsealing tool (11) is completely setting, annular space is suppressed, and pressure passes through upper through hole (207)
The upper surface of piston (209) is acted on, then promotes piston (209) descending and is stuck on lock ring (210), the top connection
(201) connected with the sandblasting hole (213) on central tube (202), so as to establish the passage linked up with stratum；Sand fracturing；
6) treat after the completion of pressure break, above carry the coiled tubing (5), unseal the repeatable setting unsealing tool (11)；
7) utilize step 3) method, infinite stages sliding sleeve (2) is positioned upwards successively；
8) repeat step 4)~7), until full well section pressure break is completed.
2. sleeve pipe infinite stages staged fracturing method as claimed in claim 1, it is characterised in that：Set at the top of the lower contact (205)
There is first step, central tube (202) bottom is provided with the second step matched with the first step, and first step is by second
Rank holds out against.
3. sleeve pipe infinite stages staged fracturing method as claimed in claim 1, it is characterised in that：If some infinite stages sliding sleeve (2) nothing
When method is normally opened, i.e., when described top connection (201) can not connect with the sandblasting hole (213) on central tube (202), work will be serviced
Carried on tool to the sleeve pipe (1) of infinite stages sliding sleeve (2) upper end that can not normally open, by repeatable setting unsealing tool (11) seat
It is encapsulated in sleeve pipe (1), avoids casing coupling (14) and sleeve pipe (1) is carried out to add sand blasting to penetrate, sleeve pipe (1) is penetrated out into rear annular space is added
Sand pressure break；After the completion of, a upper infinite stages sliding sleeve is repositioned, step 5 is carried out)~8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510307413.9A CN104929603B (en) | 2015-06-05 | 2015-06-05 | Infinite stage sectional fracturing method for casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510307413.9A CN104929603B (en) | 2015-06-05 | 2015-06-05 | Infinite stage sectional fracturing method for casing |
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| Publication Number | Publication Date |
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| CN104929603A CN104929603A (en) | 2015-09-23 |
| CN104929603B true CN104929603B (en) | 2017-07-11 |
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| CN201510307413.9A Active CN104929603B (en) | 2015-06-05 | 2015-06-05 | Infinite stage sectional fracturing method for casing |
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| CN106639968A (en) * | 2015-10-30 | 2017-05-10 | 中石化石油工程技术服务有限公司 | Multi-cluster infinite-order well cementation segmentation fracturing string and fracturing method |
| CN106640014A (en) * | 2015-10-30 | 2017-05-10 | 中石化石油工程技术服务有限公司 | Counting type infinite class multi cluster full path sectional fracturing slip sleeve |
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| CN108571306B (en) * | 2017-03-09 | 2020-06-26 | 中国石油化工股份有限公司 | Sliding sleeve, fracturing tool and fracturing method |
| CN109707358B (en) * | 2017-10-25 | 2023-09-05 | 中海石油(中国)有限公司上海分公司 | Fracturing string and fracturing method thereof |
| CN107701147B (en) * | 2017-10-26 | 2023-11-10 | 中国石油大学(北京) | An annular pressure downhole control valve |
| CN108868732B (en) * | 2018-07-26 | 2020-11-06 | 东北石油大学 | Coiled tubing stratified fracturing system tool and its stratified fracturing method |
| CN110748336B (en) * | 2019-08-06 | 2024-01-23 | 中国石油天然气集团有限公司 | Magnetic signal control electromagnetic force driving mechanical positioner and method |
| CN111472738A (en) * | 2020-03-12 | 2020-07-31 | 中国石油天然气股份有限公司 | Switchable well cementation sliding sleeve water control fracturing method for horizontal well |
| CN114075961B (en) * | 2020-08-19 | 2024-08-27 | 中国石油天然气股份有限公司 | Fracturing tool, fracturing process string and horizontal well fracturing construction method |
| CN114427420B (en) * | 2020-09-25 | 2024-03-22 | 中国石油化工股份有限公司 | Stage fracturing sliding sleeve of unlimited full-drift-diameter oil-gas well |
| CN114482958B (en) * | 2020-10-26 | 2024-06-18 | 中国石油化工股份有限公司 | Casing well cementation full-drift diameter infinite stage fracturing completion device and fracturing completion method thereof |
| CN112780227B (en) * | 2021-02-20 | 2023-06-23 | 中海油能源发展股份有限公司 | Infinite-level well cementation sliding sleeve capable of preventing cement from being solidified and assembling and operating method thereof |
| CN113266329B (en) * | 2021-06-11 | 2023-04-07 | 中煤科工集团西安研究院有限公司 | Intelligent infinite-grade segmental hydraulic fracturing system |
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| CN204002746U (en) * | 2014-08-23 | 2014-12-10 | 中国石油集团渤海钻探工程有限公司 | Coiled tubing infinite stages fracturing sliding bush |
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