CN105003226B - Electro-hydraulic dual control energy storage type pressure break completion switch and method of controlling switch - Google Patents
Electro-hydraulic dual control energy storage type pressure break completion switch and method of controlling switch Download PDFInfo
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- CN105003226B CN105003226B CN201410670324.6A CN201410670324A CN105003226B CN 105003226 B CN105003226 B CN 105003226B CN 201410670324 A CN201410670324 A CN 201410670324A CN 105003226 B CN105003226 B CN 105003226B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 34
- 230000009977 dual effect Effects 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 23
- 230000005540 biological transmission Effects 0.000 claims abstract description 62
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 66
- 239000003921 oil Substances 0.000 claims description 57
- 229910052757 nitrogen Inorganic materials 0.000 claims description 33
- 230000006835 compression Effects 0.000 claims description 21
- 238000007906 compression Methods 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 11
- 238000010276 construction Methods 0.000 claims description 6
- 239000010729 system oil Substances 0.000 claims description 6
- 230000008676 import Effects 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 208000002925 dental caries Diseases 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 239000003129 oil well Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 210000000664 rectum Anatomy 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Abstract
The invention discloses electro-hydraulic dual control energy storage type pressure break completion switch, including the top connection being sequentially connected from top to bottom, central tube, pressure transmission outer barrel, sliding sleeve outer barrel, oversheath, lower contact, energy storage device is set on the central tube, the sliding sleeve outer barrel sets sliding sleeve system, Hydraulic Power Transmission System is set inside the sliding sleeve outer barrel and oversheath, the central tube, pressure transmission outer barrel, sliding sleeve outer barrel open up the pressure transmission hole being connected, and the energy storage device, sliding sleeve system, Hydraulic Power Transmission System are connected by pressure transmission hole.Control drive system is also set up between the sliding sleeve outer barrel the latter half and oversheath.The present invention solves conventional pitching sliding sleeve staged fracturing, due to the presence of ball seat, and layering series is limited, and oil well output is impacted, and does not possess the problems such as later stage control production and selectivity exploitation.
Description
Technical field
The present invention relates to staged fracturing well-completing process, specifically electro-hydraulic dual control energy storage type pressure break completion switch and switch
Control method.
Background technology
Staged fracturing well-completing process is the important means for improving Development Response of Oilfield, not only realizes the stable yields of oil well, also
Interlayer contradiction can effectively be alleviated, ultimate recovery is improved.Particularly during staged fracturing completion, accurate, closing in time
The fluid course of lower floor is flowed to, is a crucial step in staged fracturing well-completing process.
In recent years, the technology such as interior pumping bridging plug staged fracturing of bore hole pitching sliding sleeve staged fracturing, pipe was widely applied,
Also preferable application effect is achieved.But the expansion of the expansion, application field with application scale, prior art exposes
Inadaptability.The pressure break mode of sliding sleeve is opened for pitching, due to being limited by operating tool string and tool design size, has been only capable of
Separate stratum fracfturing into finite progression is transformed, meanwhile, the presence of low-density ball and small latus rectum ball seat is impacted to wellbore tubular stream,
Increase flow resistance, cause oil well output to reduce.For in pipe pump bridging plug staged fracturing mode, it is necessary to by wireline operation by
Bored after level tripping in bridging plug perforation, pressure break and pressure break and remove bridging plug, construction period is longer, employ that equipment is more, costly, the later stage bores plug and made
Industry is also possible to produce secondary pollution to oil reservoir.The separate stratum fracfturing technology used at present, does not possess later stage control production and choosing typically
The function of selecting property exploitation.In recent years, many scientific research institutions and research institution all had been directed to developing new pressure break completion both at home and abroad
Technique, to meet the technical need at scene.
The content of the invention
It is an object of the invention to provide electro-hydraulic dual control energy storage type pressure break completion switch and method of controlling switch, solve often
The pitching sliding sleeve staged fracturing of rule, due to the presence of ball seat, layering series is limited, and oil well output is impacted, and is not had
The problems such as standby later stage control production and selectivity exploitation.
In order to reach above-mentioned purpose, present invention employs following technical scheme, electro-hydraulic dual control energy storage type pressure break completion is switched,
Including the top connection being sequentially connected from top to bottom, central tube, pressure transmission outer barrel, sliding sleeve outer barrel, oversheath, lower contact, the center
Energy storage device is set on pipe, and the sliding sleeve outer barrel sets and sets liquid inside sliding sleeve system, the sliding sleeve outer barrel and oversheath
Transmission system is pressed, the central tube, pressure transmission outer barrel, sliding sleeve outer barrel open up the pressure transmission hole being connected, the energy storage device, sliding sleeve
System, Hydraulic Power Transmission System are connected by pressure transmission hole.
Control drive system, the control drive system bag are also set up between the sliding sleeve outer barrel the latter half and oversheath
Control device, high-temperature battery group and solenoid directional control valve are included, control device is made up of radio receiver, controller, control device,
High-temperature battery group is arranged in the preceding cavity that sliding sleeve outer barrel is surrounded with oversheath, and solenoid directional control valve is arranged on sliding sleeve outer barrel and outer shield
Cover in the rear cavity surrounded, two of solenoid directional control valve export the two pressure transmission holes company opened up respectively with sliding sleeve outer barrel top half
Connect, the pressure transmission hole that an import is opened up with sliding sleeve outer barrel the latter half is connected, control device passes through signal pipe with solenoid directional control valve
Line is connected, and signal pipe line is arranged in the side annular groove that sliding sleeve outer barrel is surrounded with oversheath.
The Hydraulic Power Transmission System includes oil pocket, lower piston, and oil pocket is enclosed by sliding sleeve outer barrel bottom, oversheath and lower contact
Into cavity, oversheath is connected through a screw thread with sliding sleeve outer barrel and lower contact respectively up and down, edge in the thick arm in top of sliding sleeve outer barrel
Axially it is provided with to be provided with vertically in a pressure transmission hole, sliding sleeve outer barrel external wall of upper portion in two pressure transmission holes, bottom thickness arm and radially opens
Have and be radially provided with inlet on liquid outlet, lower contact inwall.
The energy storage device includes nitrogen charging device, nitrogen chamber, compression spring, compression nut, upper piston, and nitrogen charging device is by certainly
Nitrogen charging joint, ball seat, ball sealer, push rod and the nitrogen charging spring composition being sequentially connected under above, in central tube heavy wall
In pre-manufactured hole, the top of pressure transmission outer barrel and the top of central tube are connected through a screw thread, and the cavity of formation is nitrogen chamber, and inside is set
There are compression spring, upper piston, compression spring top is cased with compression nut, and spring bottom sets upper piston, and compression nut is used for pre-
Tight compression spring, nitrogen pressure and initial tension of spring are all acted on upper piston, and energy storage device is to be used to provide to sliding sleeve system
Close power.
The sliding sleeve system includes sliding sleeve, upper oil cavitie, lower oil cavitie, anti-rotation pin, and the upper and lower oil pocket is by sliding sleeve and cunning
Two cavitys that set outer barrel is surrounded, the two pressure transmission hole phases of two cavitys respectively with being opened up vertically in the thick arm in sliding sleeve outer barrel top
Connection, upper oil cavitie is also connected with nitrogen chamber, and inlet is radially provided with sliding sleeve inwall.
In order to reach above-mentioned another object, present invention employs following technical scheme, the control mode of completion switch is adopted
With automatically controlled, send wireless signal instruction by putting into signal ball and control the on off state that completion is switched, type of drive using electricity,
Liquid joint drives, and the implementation process of control method is：
Original state：Solenoid directional control valve is closed, and inlet is closed, two liquid outlet connections, sliding sleeve two ends oil
Chamber is in connected state, pressure at two ends by two pressure transmission holes above pressure line and sliding sleeve outer barrel, and solenoid directional control valve
Balance, sliding sleeve is failure to actuate, and completion switch is closed；
Electro-hydraulic dual control energy storage type pressure break completion switchs opening procedure：Control drive system in completion switch is connected to opening and referred to
After order, solenoid directional control valve is controlled, valve element is acted, and transmission system oil pocket is connected with sliding sleeve lower oil cavitie, when overpressure reaches shear pin
When cutting pressure, shear pin is cut, and overpressure promotes lower piston to move up, and the pressure oil in oil pocket enters sliding sleeve lower oil cavitie
Sliding sleeve is promoted to move up, the pressure oil in sliding sleeve upper oil cavitie enters chamber below nitrogen chamber by the pressure transmission hole on pressure transmission outer barrel,
Promote upper piston to move up, compression spring and nitrogen realize that pressure is stored, complete thermal energy storage process, completion switch liquid outlet is opened, entered
Row pressing crack construction；
Electro-hydraulic dual control energy storage type pressure break completion switchs closing process：Pressing crack construction terminates rear overpressure reduction, nitrogen chamber
Interior pressure is more than overpressure, promotes upper piston to move down, and pressure oil enters sliding sleeve upper oil cavitie, promotes sliding sleeve to move down, under sliding sleeve
Pressure oil in oil pocket is back to transmission system oil pocket, and completion switch liquid outlet closing controls drive system to be connected to closing afterwards
Instruction, control solenoid directional control valve resets, and closes inlet, and completion switch returns to initial closed state, and on off state is not managed
Interior pressure influence；
Repeat appeal operation and completion switch multiple switching operation can be achieved.
Compared to prior art, the invention has the advantages that：
The electro-hydraulic dual control energy storage type pressure break completion switch, is designed, layering series is unrestricted using full-bore.On off state
Using automatically controlled mode, switch is repeated, later stage selectively exploitation etc. is met and requires.Type of drive is using electricity, liquid joint driving, electricity
Magnetic reversal valve uses driven by power, the lower oil cavitie feed pathway on switching sliding sleeve, and valve element is designed using pressure balance type, valve element
Action only needs to overcome frictional force, and operation power is smaller, can select the magnetic valve of reduced size, meets the peace in small space
Reload request, sliding sleeve switch operation uses hydraulic-driven, and driving power is larger, is conducive to sliding sleeve to move up and down, it is ensured that sliding sleeve switch
The reliability of action.
Brief description of the drawings
Fig. 1 is the structural representation of electro-hydraulic dual control energy storage type pressure break completion switch；
Fig. 2 is partial enlarged drawing at Fig. 1 I；
Fig. 3 is the profile that pressure break completion switchs section A-A；
Fig. 4 is the profile that pressure break completion switchs section B-B；
Fig. 5 is the profile that pressure break completion switchs section C-C；
Fig. 6 is the structural representation of pressure break completion switch controlling device；
Fig. 7 is electromagnetic switch valve closed mode schematic diagram；
Fig. 8 is solenoid directional control valve opening schematic diagram.
In figure, top connection 1, nitrogen charging device 2, compression nut 3, spring 4, central tube 5, piston 6, pressure transmission outer barrel 7, pressure transmission hole
8th, sliding sleeve 9, upper oil cavitie 10, lower oil cavitie 11, pressure transmission hole 12, pressure transmission hole 13, liquid outlet 14, anti-rotation pin 15, sliding sleeve outer barrel 16, height
Warm battery pack 17, control device 18, inlet 19, solenoid directional control valve 20, signal pipe line 21, pressure transmission hole 22, oil pocket 23, lower piston
24th, inlet 25, shear pin 26, lower piston retainer ring 27, oversheath 28, lower contact 29, cavity 30, annular groove 31, cavity 32.
Embodiment
Detailed description for the present invention and technology contents, coordinate brief description of the drawings it is as follows, but accompanying drawing only provide reference with
Purposes of discussion, not for being any limitation as to the present invention.
According to Fig. 1-8, electro-hydraulic dual control energy storage type pressure break completion switch, mainly outside top connection 1, central tube 5, pressure transmission
Cylinder 7, sliding sleeve outer barrel 16, oversheath 28, lower contact 29 and the internal energy storage device set, Hydraulic Power Transmission System, control drivetrain
System and sliding sleeve system composition.
Energy storage device includes nitrogen charging device 2, nitrogen chamber, spring 4, compression nut 3, upper piston 6.Nitrogen charging device 2 is by nitrogen charging
Joint 2-1, ball seat 2-2, ball sealer 2-3, push rod 2-4 and spring 2-5 compositions, in the pre-manufactured hole in the heavy wall of central tube 5,
The top of pressure transmission outer barrel 7 and the top of central tube 5 are connected through a screw thread, and the cavity of formation is nitrogen chamber, is internally provided with compression
Nut 3, spring 4, upper piston 6, compression nut 3 are used for preloading spring 4, and nitrogen pressure and initial tension of spring all act on upper piston
On 6.Energy storage device is to be used to provide to sliding sleeve 9 to close power.
Hydraulic Power Transmission System includes oil pocket and pressure oil 23, pressure line and pressure transmission hole 12,13,22, pressure transmission hole 8, lower work
Plug 24, oil pocket is the cavity surrounded by sliding sleeve outer barrel 16, oversheath 28 and lower contact 29, oversheath about 28 with sliding sleeve outer barrel 16
It is connected through a screw thread with lower contact 29, is provided with two pressure transmission holes 12,13 vertically in the thick arm in top of sliding sleeve outer barrel 16, bottom is thick
It is provided with vertically in arm in a pressure transmission hole 22, external wall of upper portion and is radially provided with liquid outlet 14, on the inwall of lower contact 29 radially
It is provided with inlet 25.
Drive system is controlled to include control device 18, high-temperature battery group 17 and solenoid directional control valve 20, control device 18, high temperature
Battery pack 17 is arranged in the cavity 32 that sliding sleeve outer barrel 16 is surrounded with oversheath 28, and solenoid directional control valve 20 is arranged on sliding sleeve outer barrel 16
In the cavity 30 surrounded with oversheath 28, two outlets of solenoid directional control valve 20 are connected with pressure transmission hole 12,13 respectively, an import
It is connected with pressure transmission hole 22, control device 18 is connected with solenoid directional control valve 20 by signal pipe line 21, signal pipe line 21 is arranged in ring
In shape groove 31.Control device 18 is made up of radio receiver 18-1, controller 18-2, and radio receiver 18-1 is used to receive
Wireless control signal, controller 18-2 is used for the action for controlling magnetic valve, radio receiver 18-1 signal output part connection
Controller 18-2 signal input part, controller 18-2 signal output part connection solenoid directional control valve 20.Controller therein and
Reception device is the product that existing market can directly be bought, just not reinflated herein to repeat.
Sliding sleeve system includes sliding sleeve 9, sliding sleeve outer barrel 16, upper oil cavitie 10, lower oil cavitie 11, anti-rotation pin 15, and upper and lower oil pocket is
The cavity surrounded by sliding sleeve 9 and sliding sleeve outer barrel 16, is connected with pressure transmission hole 12,13, and upper oil cavitie 10 is also connected with nitrogen chamber, sliding
Cover and inlet 19 is radially provided with 9 inwalls.
The implementation process of the control method of electro-hydraulic dual control energy storage type pressure break completion switch is：
Original state：The valve element of solenoid directional control valve 20 is in position shown in Fig. 6, and inlet is closed, two liquid outlet connections,
The two ends oil pocket 10,11 of sliding sleeve 9 is in connected state by pressure transmission hole 12,13, and solenoid directional control valve 20, and pressure at two ends is balanced,
Sliding sleeve 9 is failure to actuate, and completion switch is closed.
Opening procedure：Control drive system in pressure break completion switch is connected to after OPEN, controls solenoid directional control valve 20,
Valve element is moved to position shown in Fig. 7, and transmission system oil pocket 23 passes through pressure transmission hole 22,13 and the inlet and outlet pressure pipe of solenoid directional control valve 20
Line is connected with sliding sleeve lower oil cavitie 11, and overpressure is acted on lower piston 24 by inlet 25, when overpressure reaches shear pin
During 26 cutting pressure, shear pin is cut, and overpressure promotes lower piston 24 to move up, and the pressure oil in oil pocket 23 enters sliding sleeve
9 lower oil cavities 11 promote sliding sleeve 9 to move up, and the inlet 19 on sliding sleeve 9 is connected with the liquid outlet 14 on sliding sleeve outer barrel 16, upper oil cavitie 10
Interior pressure oil enters nitrogen chamber by pressure transmission hole 8 and promotes upper piston 6 to move up, and compression spring 4 and nitrogen realize that pressure is stored,
Completion switch is opened.
Closing process：Pressing crack construction terminates rear overpressure reduction, and nitrogen cavity pressure is more than living in overpressure, promotion
Plug 6 is moved down, and pressure oil enters sliding sleeve upper oil cavitie 10, promotes sliding sleeve 9 to move down, the pressure oil in sliding sleeve lower oil cavitie 11 is back to biography
Dynamic system oil pocket 23, completion switch liquid outlet closing, controls drive system to be connected to out code afterwards, and control solenoid directional control valve is answered
Position, closes solenoid directional control valve inlet, and completion switch returns to initial closed state, and on off state is not influenceed by overpressure.
Repeat appeal operation and completion switch multiple switching operation can be achieved.
Presently preferred embodiments of the present invention is the foregoing is only, is not used to limit the scope of the claims of the present invention, other are with this
The equivalence changes of the patent spirit of invention, all should all belong to the scope of the claims of the present invention.
Claims (5)
1. electro-hydraulic dual control energy storage type pressure break completion switch, it is characterised in that including be sequentially connected from top to bottom top connection, center
Energy storage device, the sliding sleeve outer barrel are set on pipe, pressure transmission outer barrel, sliding sleeve outer barrel, oversheath, lower contact, the central tube
Set and Hydraulic Power Transmission System, the central tube, pressure transmission outer barrel, cunning are set inside sliding sleeve system, the sliding sleeve outer barrel and oversheath
Set outer barrel opens up the pressure transmission hole being connected, and the energy storage device, sliding sleeve system, Hydraulic Power Transmission System are connected by pressure transmission hole
It is logical；
The energy storage device includes nitrogen charging device, nitrogen chamber, compression spring, compression nut, upper piston, and nitrogen charging device is by from upper
Under be sequentially connected nitrogen charging joint, ball seat, ball sealer, push rod and nitrogen charging spring composition, it is prefabricated in central tube heavy wall
In hole, the top of pressure transmission outer barrel and the top of central tube are connected through a screw thread, and the cavity of formation is nitrogen chamber, is internally provided with pressure
Contracting spring, upper piston, compression spring top are cased with compression nut, and compression spring bottom sets upper piston, and compression nut is used for pre-
Tight compression spring, nitrogen pressure and initial tension of spring are all acted on upper piston, and energy storage device is to be used to provide to sliding sleeve system
Close power.
2. electro-hydraulic dual control energy storage type pressure break completion switch according to claim 1, it is characterised in that under the sliding sleeve outer barrel
Control drive system is also set up between half part and oversheath, the control drive system includes control device, high-temperature battery group
And solenoid directional control valve, control device, high-temperature battery group are in the preceding cavity that sliding sleeve outer barrel and oversheath are surrounded, electromagnetic switch
Valve is arranged in the rear cavity that sliding sleeve outer barrel and oversheath are surrounded, two outlets of solenoid directional control valve respectively with sliding sleeve outer barrel upper half
Two pressure transmission holes connection that part is opened up, the pressure transmission hole that an import and the sliding sleeve outer barrel the latter half of solenoid directional control valve are opened up connects
Connect, control device is connected with solenoid directional control valve by signal pipe line, signal pipe line is arranged in what sliding sleeve outer barrel was surrounded with oversheath
In the annular groove of side.
3. electro-hydraulic dual control energy storage type pressure break completion switch according to claim 1, it is characterised in that the hydraulic drive system
System includes oil pocket, lower piston, and oil pocket is divided above and below the cavity surrounded by sliding sleeve outer barrel bottom, oversheath and lower contact, oversheath
It is not connected through a screw thread with sliding sleeve outer barrel and lower contact, two pressure transmission holes is provided with vertically in the thick arm in top of sliding sleeve outer barrel, under
Portion thickness arm in be provided with vertically in a pressure transmission hole, sliding sleeve outer barrel external wall of upper portion be radially provided with completion switch liquid outlet, under connect
The second inlet is radially provided with head inwall.
4. electro-hydraulic dual control energy storage type pressure break completion switch according to claim 1, it is characterised in that the sliding sleeve system bag
Sliding sleeve, upper oil cavitie, lower oil cavitie, anti-rotation pin are included, the upper and lower oil pocket is two cavitys surrounded by sliding sleeve and sliding sleeve outer barrel,
Two cavitys are connected with two pressure transmission holes opened up vertically in the thick arm in sliding sleeve outer barrel top respectively, upper oil cavitie also with nitrogen chamber
It is connected, the first inlet is radially provided with sliding sleeve inwall.
5. electro-hydraulic dual control energy storage type pressure break completion method of controlling switch, it is characterised in that the control mode of completion switch is used
It is automatically controlled, the on off state that completion is switched is controlled by putting into signal ball transmission wireless signal instruction, type of drive is using electricity, liquid
Joint drives, and the implementation process of control method is：
Original state：Solenoid directional control valve is closed, and an import of solenoid directional control valve is closed, two of solenoid directional control valve
Outlet, sliding sleeve two ends oil pocket by two pressure transmission holes, and solenoid directional control valve above pressure line and sliding sleeve outer barrel at
In connected state, pressure at two ends balance, sliding sleeve is failure to actuate, and completion switch is closed；
Electro-hydraulic dual control energy storage type pressure break completion switchs opening procedure：Control drive system in completion switch is connected to OPEN
Afterwards, solenoid directional control valve is controlled, valve element is acted, and transmission system oil pocket is connected with sliding sleeve lower oil cavitie, when overpressure reaches that shear pin is cut
During disconnected pressure, shear pin is cut, and overpressure promotes lower piston to move up, and the pressure oil in oil pocket is pushed away into sliding sleeve lower oil cavitie
Dynamic sliding sleeve is moved up, and the pressure oil in sliding sleeve upper oil cavitie enters chamber below nitrogen chamber by the pressure transmission hole on pressure transmission outer barrel, pushes away
Dynamic upper piston is moved up, and compression spring and nitrogen realize that pressure is stored, and completes thermal energy storage process, and completion switch liquid outlet is opened, carried out
Pressing crack construction；
Electro-hydraulic dual control energy storage type pressure break completion switchs closing process：Pressing crack construction terminates rear overpressure reduction, nitrogen intracavitary pressure
Power is more than overpressure, promotes upper piston to move down, and pressure oil enters sliding sleeve upper oil cavitie, promotes sliding sleeve to move down, sliding sleeve lower oil cavitie
Interior pressure oil is back to transmission system oil pocket, and completion switch liquid outlet closing controls drive system to be connected to out code afterwards,
Control solenoid directional control valve to reset, close an import of solenoid directional control valve, completion switch returns to initial closed state, switchs shape
State is not influenceed by overpressure；
Completion switch multiple switching operation can be realized by repeating aforesaid operations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410670324.6A CN105003226B (en) | 2014-11-20 | 2014-11-20 | Electro-hydraulic dual control energy storage type pressure break completion switch and method of controlling switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410670324.6A CN105003226B (en) | 2014-11-20 | 2014-11-20 | Electro-hydraulic dual control energy storage type pressure break completion switch and method of controlling switch |
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| Publication Number | Publication Date |
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| CN105003226A CN105003226A (en) | 2015-10-28 |
| CN105003226B true CN105003226B (en) | 2017-09-12 |
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| US7802627B2 (en) * | 2006-01-25 | 2010-09-28 | Summit Downhole Dynamics, Ltd | Remotely operated selective fracing system and method |
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| CN105003226A (en) | 2015-10-28 |
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