CN104373103B - A kind of refracturing tubing string and method can be temporarily blocked up in the old well seam of high flow rate operation - Google Patents
A kind of refracturing tubing string and method can be temporarily blocked up in the old well seam of high flow rate operation Download PDFInfo
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- CN104373103B CN104373103B CN201410735076.9A CN201410735076A CN104373103B CN 104373103 B CN104373103 B CN 104373103B CN 201410735076 A CN201410735076 A CN 201410735076A CN 104373103 B CN104373103 B CN 104373103B
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- 238000000034 method Methods 0.000 title claims description 12
- 238000010276 construction Methods 0.000 claims abstract description 22
- 230000009466 transformation Effects 0.000 claims abstract description 8
- 238000011010 flushing procedure Methods 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 210000002445 nipple Anatomy 0.000 claims description 12
- 238000013461 design Methods 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 abstract description 8
- 230000000903 blocking effect Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 206010010214 Compression fracture Diseases 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 208000010392 Bone Fractures Diseases 0.000 description 3
- 206010017076 Fracture Diseases 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000001965 increasing effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
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Abstract
The invention belongs to oil field compression fracture technical field, and in particular to a kind of can temporarily block up refracturing tubing string in the old well seam of high flow rate operation, including oil pipe, hydraulic anchor and hydraulic anchor packer even, packer lower end is connected with straight nozzle sliding sleeve throttling device, and oil pipe is 31/2Oil pipe, the oil pipe are connected with hydraulic anchor by variable buckle crossover sub.Present invention also offers fracturing technology, comprises the steps：1）Connection fracturing string；2）Under enter fracturing string；3）Pressure break is temporarily blocked up；4）Huge discharge pressure break；5）After construction terminates, first control open flow, then reacting cycle well-flushing from oil pipe, repeat transformation and finish, finally proceed to blowdown period.Beneficial effect：Under the restriction of sleeve pipe size, with conventional 27/8Pressure break tubing string is compared, and adopts 31/2Oil pipe and straight nozzle sliding sleeve throttling device, realize one-trip string working continuously in small displacement and high flow rate operation, have both met the requirement for temporarily blocking up pressure break in stitching under small displacement, and have also realized huge discharge and work continuously.
Description
Technical field
The invention belongs to oil field compression fracture technical field, and in particular to a kind of temporarily stifled in the old well seam of high flow rate operation can repeat
Fracturing string and method, are primarily directed under low permeability reservoir old filed straight well huge discharge（6 m3/min）Carry out stitching interior temporarily stifled weight
Multiple fracturing reform, is suitable for less to stress difference with level two and intrinsic fracture comparative development stratum middle sleeve completion repetition
Transformation well（Well depth is less than 2000m）.
Background technology
At present, most domestic oil field all enters high water cut rate, and the situation is tense for stable yields, and old well refracturing becomes old oil
One of requisite offensive measure of field stable yields.
For the middle low water cut well for only exploiting a main layer position flatly, old well refracturing is mainly with increase plus sand at present
Scale, temporarily stifled old seam press the refracturing techniques such as new seam.Press new seam fracturing technology collection laterally to make due to temporarily stifled old seam newly to stitch and change
Be apt to always seam flow conductivity, development length is stitched always with the lateral remaining oil in communication crack, control and reduce water breakthrough risk etc.
Advantage, is widely used in the transformation of old filed refracturing.
Research shows, for low permeability oil field, reservoir is fine and close, and the new seam of pressure is temporarily blocked up in simple dependence, and crack turning radius is little, arranges
Apply amount of increase in production low short with the term of validity, need to expand transformation scale further, increase lateral seam complexity and crack bandwidth is come
Improve correctional effect, such as light sleeve pipe huge discharge mixing pressure break.And early stage light sleeve pipe huge discharge fracturing technology can only be directed to sleeve pipe
Intact well, meanwhile, carry out stitching under huge discharge the new joint stabilizing process of interior temporarily stifled pressure and realize difficulty greatly, and pursue simply and improve construction
Discharge capacity is little to increase net pressure amplitude.Accordingly, it would be desirable to the temporarily stifled pressure break that can be met under conventional discharge capacity can meet huge discharge and apply again
The integral process tubing string of work.
Content of the invention
The purpose of the present invention be temporarily blocking up under pressure break of overcoming that existing fracturing string can not be under conventional discharge capacity be met while
Meet the problem of high flow rate operation.
For this purpose, the invention provides a kind of can temporarily block up refracturing tubing string in the old well seam of high flow rate operation, including oil pipe,
Hydraulic anchor and hydraulic anchor packer even, the packer lower end are connected with straight nozzle sliding sleeve throttling device, and the oil pipe is 31/2〞
Oil pipe, the oil pipe are connected with hydraulic anchor by variable buckle crossover sub.
The packer is k344 type 27/8Packer.
The variable buckle crossover sub is 31/2〞—27/8Variable buckle crossover sub.
The packer lower end passes through 27/8Tubing nipple is connected with straight nozzle sliding sleeve throttling device.
Present invention also offers a kind of can temporarily block up refracturing method in the old well seam of high flow rate operation, including following step
Suddenly：
Step 1）Connection fracturing string：According to being sequentially connected 3 from top to bottom1/2Oil pipe, 31/2〞—27/8Variable buckle conversion connects
Head, hydraulic anchor, packer, 27/8Tubing nipple, straight nozzle sliding sleeve throttling device；
Step 2）Under enter fracturing string：Through wash well, be able to temporarily will block up under refracturing tubing string in the old well seam of high flow rate operation
Enter to design attitude, make straight nozzle sliding sleeve throttling device be located at perforated interval top circle 3-5m；
Step 3）Temporarily block up the pressure break stage：Sit fracture well head, start Frac unit, 0.3 ~ 0.5 side/point discharge capacity direct circulation low
For well-flushing, low for circulation normal after put forward discharge capacity, using carrying out crack after conventional 1 ~ 2 side of discharge capacity/point make packer normally set
Open, fracturing fluid is injected from well mouth oil pipe, temporarily blocked up pressure break staged construction, realize temporarily stifled boosting and make new seam；
Step 4）The huge discharge pressure break stage：Temporarily after the completion of the new seam of stifled pressure, steel ball is put into from oil pipe, with 0.3-0.5m3/min
Discharge capacity send steel ball to straight nozzle sliding sleeve throttling device ball seat, build the pressure after cutting off straight nozzle sliding sleeve throttling device ball seat pin, steel ball and
Sump hole fallen into by straight nozzle sliding sleeve throttling device ball seat, realizes straight nozzle sliding sleeve throttling device and 27/8Tubing nipple full-bore；Ball
After seat sliding sleeve access opening feature is obvious, improving discharge capacity to design requirement carries out the main pressing crack construction of huge discharge；
Step 5）After construction terminates, first control open flow, then reacting cycle well-flushing from oil pipe, repeat transformation and finish, finally proceed to
Blowdown period.
Beneficial effects of the present invention have following some：
Firstth, under the restriction of sleeve pipe size, with conventional 27/8Pressure break tubing string is compared, and adopts 31/2Oil pipe and Zhi Zui
Sub- sliding sleeve throttling device, realizes one-trip string working continuously in small displacement and high flow rate operation, had both met under small displacement and has stitched
The interior requirement for temporarily blocking up pressure break, also achieves huge discharge and works continuously, facilitate under huge discharge and temporarily blocked up refracturing technique
Realize.
Secondth, in integrated seam, temporarily the new seam of stifled pressure and huge discharge improve crack complexity and increase the advantage of crack bandwidth,
Expand the lateral remaining oil in crack and involve scope, repetition correctional effect is improve, oil increment from stimulation is 2 times of conventional refracturing.
3rd, the tubing string is furnished with packer and hydraulic anchor protection sleeve pipe and fracturing string, and working security is high.
4th, the tubing string is also applied for the well that wellbore casing has corrosion failure, and eliminates and carry out light sleeve pipe huge discharge
Engineering log expense before mixing pressure break, while old well capacity is recovered, shortens construction period, has saved construction cost,
Show very strong economy.
Description of the drawings
Fig. 1 is the structural representation of the present invention.
In figure：1、31/2Oil pipe；2nd, variable buckle crossover sub；3rd, hydraulic anchor；4th, packer；5. straight nozzle sliding sleeve throttling device；
6、27/8Tubing nipple；7th, sleeve pipe.
It is described in further details below in conjunction with accompanying drawing.
Specific embodiment
Embodiment 1：
Temporarily blocking up under pressure break while meeting huge discharge under conventional discharge capacity can not met to solve existing fracturing string
The problem of construction, present embodiments provide a kind of can temporarily block up refracturing tubing string in the old well seam of high flow rate operation, including oil pipe,
Hydraulic anchor 3 and hydraulic anchor 3 packer 4 even, 4 lower end of packer are connected with straight nozzle sliding sleeve throttling device 5, and oil pipe is 31/2〞
Oil pipe 1, the oil pipe are connected with hydraulic anchor 3 by variable buckle crossover sub 2.
According to being sequentially connected 3 from top to bottom1/2Oil pipe 1, variable buckle crossover sub 2, hydraulic anchor 3, packer 4, straight nozzle are sliding
Set flow controller 5, constitutes fracturing string；The course of work and principle of the fracturing string：By under fracturing string lower going-into-well, straight nozzle is made
Sliding sleeve throttling device 5 is located at perforated interval top circle 3-5m, due to straight nozzle sliding sleeve throttling device 5（As aperture ￠ 25mm）Throttling action,
Packer 4 sets, then according to design injects fracturing fluid from well mouth oil pipe, is temporarily blocked up pressure break staged construction, realizes temporarily stifled liter
Pressure makes new seam.
After the completion of temporarily stifled pressure is newly stitched, steel ball is put into from oil pipe（As ￠ 38mm, mate with ball seat）, with 0.3-0.5m3/
The discharge capacity release of min is built the pressure after cutting off straight 5 ball seat pin of nozzle sliding sleeve throttling device to straight 5 ball seat of nozzle sliding sleeve throttling device, steel ball
Sump hole is fallen into straight 5 ball seat of nozzle sliding sleeve throttling device, realize straight nozzle sliding sleeve throttling device 5 and 27/8Tubing nipple all-pass
Footpath；After ball seat sliding sleeve access opening feature is obvious, improving discharge capacity to design requirement carries out the main pressing crack construction of huge discharge, as tubing string is temporary
Stifled pressure is new to stitch stage to high flow rate operation stage tool continuity, well head not pressure release, it is ensured that safe construction.
Pressure break discontinuous running is temporarily blocked up in seam when straight nozzle sliding sleeve throttling device 5 can realize the construction of early stage small displacement；Later stage
Throwing steel ball is built the pressure after cutting the ball seat pin of flow controller, and steel ball together falls into sump hole with straight 5 ball seat of nozzle sliding sleeve throttling device,
Guarantee flow controller body and tubing string full-bore, by 31/2The big orifice of 1 post of oil pipe, realizes huge discharge fracturing work.
Embodiment 2：
Present embodiments provide a kind of as shown in Figure 1 a kind of refracturing pipe can be temporarily blocked up in the old well seam of high flow rate operation
Post, by 31/2Oil pipe 1,31/2〞—27/8Variable buckle crossover sub 2, hydraulic anchor 3, packer 4,27/8Tubing nipple 6, straight nozzle
Sliding sleeve throttling device 5 is sequentially connected composition, and wherein packer 4 is k344 type 27/8Packer 4.
As variable buckle crossover sub 2 is 31/2〞—27/8Variable buckle crossover sub 2,31/2Tip side and 31/2Oil pipe 1 connects
Connect, 27/8Joint and 27/8Hydraulic anchor 3 connect, be then sequentially connected packer 4,27/8Tubing nipple 6, straight nozzle sliding sleeve
Flow controller 5, in the present embodiment, packer 4 is k344 type 27/8Packer 4.
The course of work and principle of the present embodiment fracturing string：Under fracturing string lower going-into-well, straight nozzle sliding sleeve throttling will be made
Device 5 is located at perforated interval top circle 3-5m, due to straight nozzle sliding sleeve throttling device 5（As aperture ￠ 25mm）Throttling action, packer 4 sits
Envelope, then according to design injects fracturing fluid from well mouth oil pipe, is temporarily blocked up pressure break staged construction, and realization is temporarily blocked up boosting and makes new seam.
After the completion of temporarily stifled pressure is newly stitched, steel ball is put into from oil pipe（As ￠ 38mm, mate with ball seat）, with 0.3-0.5m3/
The discharge capacity release of min is built the pressure after cutting off straight 5 ball seat pin of nozzle sliding sleeve throttling device to straight 5 ball seat of nozzle sliding sleeve throttling device, steel ball
Sump hole is fallen into straight 5 ball seat of nozzle sliding sleeve throttling device, realize straight nozzle sliding sleeve throttling device 5 and 27/86 all-pass of tubing nipple
Footpath；After ball seat sliding sleeve access opening feature is obvious, improving discharge capacity to design requirement carries out the main pressing crack construction of huge discharge, as tubing string is temporary
Newly seam stage to high flow rate operation stage tool continuity, the well head not pressure release of stifled pressure, adds operating tool string 31/2To 27/8Oil pipe
Reducing conversion itself has certain throttling action under huge discharge and is always maintained at setting so as to ensure packer 4, it is ensured that peace
Full construction.
With conventional 27/8Pressure break tubing string is compared, and the tubing string is met under conventional discharge capacity to carry out stitching interior temporary stifled old seam pressure newly
Seam, can carry out huge discharge pressure break again under same tubing string.Lateral seam is made by temporary stifled boosting, then high flow rate operation increases crack
Net pressure, improves lateral seam complexity, increases crack bandwidth, at utmost link up the lateral remaining oil in crack, it is ensured that same to well
With layer refracturing effect.Meanwhile, the tubing string not only eliminates old well due to protecting the above sleeve pipe 7 of perforated interval with packer 4
Must be carried out outside the expenses such as 7 engineering log of sleeve pipe before huge discharge refracturing being carried out using light sleeve pipe 7, be also applied for sleeve pipe 7
Old well with corrosion failure, has not only saved operating expenses, and has recovered old well capacity and improve correctional effect.
Embodiment 3：
The present invention temporarily can block up refracturing method in the old well seam of high flow rate operation, comprise the steps：
Step 1）Connection fracturing string：According to being sequentially connected 3 from top to bottom1/2Oil pipe 1,31/2〞—27/8Variable buckle is changed
Joint 2, hydraulic anchor 3, packer 4,27/8Tubing nipple 6, straight nozzle sliding sleeve throttling device 5；
Step 2）Under enter fracturing string：Through wash well, be able to temporarily will block up under refracturing tubing string in the old well seam of high flow rate operation
Enter to design attitude, make straight nozzle sliding sleeve throttling device 5 be located at perforated interval top circle 3-5m；
Step 3）Temporarily block up the pressure break stage：Fracture well head is sat, starts Frac unit, small displacement direct circulation is low for well-flushing, low replace
Discharge capacity is put forward after circulation is normal, make packer 4 crack unlatching be carried out after normally setting using conventional discharge capacity, inject from well mouth oil pipe
Fracturing fluid, is temporarily blocked up pressure break staged construction, is realized temporarily stifled boosting and is made new seam；
Step 4）The huge discharge pressure break stage：Temporarily after the completion of the new seam of stifled pressure, steel ball is put into from oil pipe, with 0.3-0.5m3/min
Discharge capacity send steel ball to straight 5 ball seat of nozzle sliding sleeve throttling device, build the pressure after cutting off straight 5 ball seat pin of nozzle sliding sleeve throttling device, steel ball
Sump hole is fallen into straight 5 ball seat of nozzle sliding sleeve throttling device, realize straight nozzle sliding sleeve throttling device 5 and 27/86 all-pass of tubing nipple
Footpath；After ball seat sliding sleeve access opening feature is obvious, improving discharge capacity to design requirement carries out the main pressing crack construction of huge discharge；
Step 5）After construction terminates, first control open flow, then reacting cycle well-flushing from oil pipe, repeat transformation and finish, finally proceed to
Blowdown period.
In sum, the present invention is under the restriction of 7 size of sleeve pipe, with conventional 27/8Pressure break tubing string is compared, and adopts 31/2〞
Oil pipe 1 and straight nozzle sliding sleeve throttling device 5, realize one-trip string working continuously in small displacement and high flow rate operation, both met
The requirement of pressure break is temporarily blocked up under small displacement in seam, is also achieved huge discharge and is improved crack complexity and increase the effect of bandwidth,
There is the old seam length of control and reduce water breakthrough risk, it is achieved that huge discharge is worked continuously, and improves efficiency of construction and increasing
Effect is produced, and facilitates under the huge discharge realization temporarily blocked up by refracturing technique.Meanwhile, the tubing string is due to protecting with packer 4
The above sleeve pipe 7 of shield perforated interval, not only eliminating old well must carry out sleeve pipe before huge discharge refracturing is carried out using light sleeve pipe 7
Outside the expenses such as 7 engineering logs, old well of the sleeve pipe 7 with corrosion failure is also applied for, operating expenses has not only been saved, and has been recovered
Old well capacity and improve correctional effect.
The fracturing string of the present invention and technique can be used for low permeability reservoir old filed straight well huge discharge under the conditions of seam in temporarily
Stifled refracturing transformation, well depth are less than 2000m, and operational discharge capacity is more than 6m3/min.
Part that the present embodiment is not described in detail and structure belong to well-known components and common structure or the conventional hand of the industry
Section, is not described here one by one.
Illustration only to the present invention exemplified as above, does not constitute the restriction to protection scope of the present invention, all
It is that design same or analogous with the present invention is belonged within protection scope of the present invention.
Claims (1)
1. a kind of refracturing method can temporarily be blocked up in the old well seam of high flow rate operation, it is characterised in that comprise the steps：
Step 1）Connection fracturing string：According to being sequentially connected 3 from top to bottom1/2Oil pipe（1）、31/2〞—27/8Variable buckle conversion connects
Head（2）, hydraulic anchor（3）, packer（4）、27/8Tubing nipple（6）, straight nozzle sliding sleeve throttling device（5）；
Step 2）Under enter fracturing string：Through wash well, is lowered into can temporarily block up refracturing tubing string in the old well seam of high flow rate operation
Design attitude, makes straight nozzle sliding sleeve throttling device（5）Positioned at perforated interval top circle 3-5m；
Step 3）Temporarily block up the pressure break stage：Sit fracture well head, start Frac unit, 0.3 ~ 0.5 side/point discharge capacity direct circulation low for washing
Well, low for circulation normal after put forward discharge capacity, using conventional 1 ~ 2 side of discharge capacity/point make packer（4）Carry out crack to open after normally setting
Open, fracturing fluid is injected from well mouth oil pipe, temporarily blocked up pressure break staged construction, realize temporarily stifled boosting and make new seam；
Step 4）The huge discharge pressure break stage：Temporarily after the completion of the new seam of stifled pressure, steel ball is put into from oil pipe, with 0.3-0.5m3The discharge capacity of/min
Steel ball is sent to straight nozzle sliding sleeve throttling device（5）Ball seat, builds the pressure and cuts off straight nozzle sliding sleeve throttling device（5）After ball seat pin, steel ball and
Straight nozzle sliding sleeve throttling device（5）Sump hole fallen into by ball seat, realizes straight nozzle sliding sleeve throttling device（5）With 27/8Tubing nipple（6）
Full-bore；After ball seat sliding sleeve access opening feature is obvious, improving discharge capacity to design requirement carries out the main pressing crack construction of huge discharge；
Step 5）After construction terminates, first control open flow, then reacting cycle well-flushing from oil pipe, repeat transformation and finish, finally proceed to discharge opeing
Stage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410735076.9A CN104373103B (en) | 2014-12-08 | 2014-12-08 | A kind of refracturing tubing string and method can be temporarily blocked up in the old well seam of high flow rate operation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410735076.9A CN104373103B (en) | 2014-12-08 | 2014-12-08 | A kind of refracturing tubing string and method can be temporarily blocked up in the old well seam of high flow rate operation |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106351634B (en) * | 2015-07-16 | 2019-03-05 | 中国石油化工股份有限公司 | Casing horizontal well multistage refracturing method |
| CN107387049B (en) * | 2016-09-22 | 2020-02-14 | 中国石油天然气股份有限公司 | Repeated fracturing method and system |
| CN107965305B (en) * | 2016-10-20 | 2019-12-24 | 中国石油化工股份有限公司 | Layered repeated fracturing method |
| CN109236259A (en) * | 2018-10-31 | 2019-01-18 | 西安科技大学 | A kind of contradictory fracturing process of adjustment water injection well plane water drive |
| CN109707362B (en) * | 2019-01-24 | 2021-01-01 | 中国石油天然气股份有限公司 | Fixed-point fracturing method for residual oil in longitudinal single sand body of mining and submerging old well reservoir |
| CN111219177B (en) * | 2020-03-03 | 2022-05-10 | 中国石油天然气股份有限公司 | 3-inch and half-small-borehole fracturing method for sidetracking horizontal well of ultra-low permeability sandstone reservoir |
| CN112031731A (en) * | 2020-09-17 | 2020-12-04 | 中国石油天然气股份有限公司 | Repeated fracturing process method for longitudinal seam horizontal well |
| CN112049593A (en) * | 2020-10-27 | 2020-12-08 | 中国石油天然气集团有限公司 | Long-rod coiled tubing injection tool and use method thereof |
| CN112360419B (en) * | 2020-11-16 | 2023-04-07 | 中国石油天然气股份有限公司 | Small-displacement energy supplementing and large-displacement fracturing continuous fracturing string and fracturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2240798A (en) * | 1990-02-12 | 1991-08-14 | Shell Int Research | Method and apparatus for perforating a well liner and for fracturing a surrounding formation |
| US20080066917A1 (en) * | 2006-09-14 | 2008-03-20 | Bj Services Company | Annular fracturing combo service tool |
| CN200985782Y (en) * | 2006-10-23 | 2007-12-05 | 大港油田集团有限责任公司 | Operating tool string for gas well fracturing and production put |
| CN201802376U (en) * | 2010-09-07 | 2011-04-20 | 中国石油天然气股份有限公司 | Barefoot well completion hydraulic power sand blast immovable pipe column staged fracturing string |
| CN203321476U (en) * | 2013-06-05 | 2013-12-04 | 中国石油天然气股份有限公司 | Coiled tubing controllable packer technique pipe for repeated reconstruction of old wells |
| CN204371286U (en) * | 2014-12-08 | 2015-06-03 | 中国石油天然气股份有限公司 | A kind of can stifled refracturing tubing string temporarily in the old well seam of high flow rate operation |
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