CN106481326A - The no chock pressure difference fracturing strings of self controllable supercharging - Google Patents
The no chock pressure difference fracturing strings of self controllable supercharging Download PDFInfo
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- CN106481326A CN106481326A CN201510554723.0A CN201510554723A CN106481326A CN 106481326 A CN106481326 A CN 106481326A CN 201510554723 A CN201510554723 A CN 201510554723A CN 106481326 A CN106481326 A CN 106481326A
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- fracturing
- high pressure
- pressure
- packer
- supercharging
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- 230000005540 biological transmission Effects 0.000 claims abstract description 35
- 239000004576 sand Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 10
- 238000012856 packing Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000011218 segmentation Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000009418 renovation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
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Abstract
The invention discloses the no chock pressure difference fracturing strings of self controllable supercharging, including tubular column main body, described tubular column main body sets gradually anchor from top to bottom, supercharging sets controller, high pressure resistant fracturing packer, and described supercharging sets controller and connects high pressure resistant fracturing packer also by pressure transmission pipeline.Described high pressure resistant fracturing packer is at least provided with a set of, when pressure break is carried out to multistage, need to configure the high pressure resistant fracturing packer of many sets successively, no throttle pitching fracturing sliding bush in the settings between any two covering high pressure resistant fracturing packer, all of high pressure resistant fracturing packer is sequentially connected in series also by pressure transmission pipeline more.Safety joint, guide head are also set up on described tubular column main body, described safety joint is located above anchor, and guide head is positioned at the lower section that tubular column main body bottom is last high pressure resistant fracturing packer.The present invention makes inside and outside generation of packer set pressure reduction and realize setting by disposing supercharging to set controller, thus reaching effective oil-separating layer, carries out the purpose of staged fracturing.
Description
Technical field
The present invention relates to oil well fracturing technique, the no chock pressure difference fracturing strings of specifically self controllable supercharging.
Background technology
In sleeve pipe packer staged fracturing renovation technique be realize hyposmosis, important means that thin mutual oil reservoir is effectively employed it
One, it is with strong points to have a fractured interval, and fracturing process is continuous, increases drainage area, improves oil displacement efficiency, return after pressure break
Row is timely, the technical advantage such as energy effective protection reservoir.
In the domestic trocar sheath that can retrieve at present, packer staged fracturing renovation technique mainly has upper lifting pipe post packer to divide
Section fracturing technique (horizontal well as Patent No. ZL 200720169453.2 once above carries fracturing string) and fixed tubular column
Packer staged fracturing technology.Mainly realized by two ways using hydraulic-driven set packer in both technology,
A kind of be the sand jet outlet by reducing frac-sand jet area of passage, make the inside and outside chock pressure difference that produces of fracturing string set envelope
Realize segmentation every device oil-separating layer, this design has the drawback that in fracturing process fracturing fluid to the abrasion of sand jet outlet relatively
Greatly, the area of passage making whole sand jet outlet increases, and chock pressure difference reduces or disappears, and leads to packer setting to lose efficacy, very
To leading to whole fracturing string fracture, cause construction accident.Another kind connects setting ball seat or other classes in tubing string bottom
Like instrument, make to form closed chamber in tubing string, suppress set packer.This design needs to carry out pitching, tedious process,
And packer generally requires and proposes deblocking, upper lifting force is than larger.At present, domestic many scientific research institutions and company are all in research
Fracturing strings in new pipe, can overcome the shortcomings of existing fracturing string, can meet hyposmosis, alternate thin beds reservoir again
The demand of exploitation.
Content of the invention
It is an object of the invention to provide the no chock pressure difference fracturing strings of self controllable supercharging, set by disposing supercharging
Controller makes inside and outside generation of packer set pressure reduction and realize setting, thus reaching effective oil-separating layer, carries out the mesh of staged fracturing
's.
In order to reach above-mentioned purpose, present invention employs following technical scheme, the no chock pressure difference segmentation pressure of self controllable supercharging
Split tubing string, including tubular column main body, described tubular column main body sets gradually anchor from top to bottom, supercharging sets controller, resistance to
High pressure fracturing packer, described supercharging sets controller and connects high pressure resistant fracturing packer also by pressure transmission pipeline.
Described high pressure resistant fracturing packer, at least provided with a set of, when carrying out pressure break to multistage, needs to configure how set is resistance to successively
High pressure fracturing packer, no throttles pitching fracturing sliding bush in the settings between any two covering high pressure resistant fracturing packer more, owns
High pressure resistant fracturing packer be sequentially connected in series also by pressure transmission pipeline.
Safety joint, guide head are also set up on described tubular column main body, described safety joint is located above anchor, guide head
It is the lower section of last high pressure resistant fracturing packer positioned at tubular column main body bottom.
Described supercharging sets controller and includes central canal, cylinder sleeve, described cylinder sleeve be enclosed within central canal outside and and central canal it
Between form annular space, piston is installed, the upper end radial symmetric of described central canal is distributed two radial direction pressure transmission holes, is used in annular space
Connection center tube cavity and above-mentioned annular space, described cylinder sleeve lower end connects pressure-transmitting joint, pressure-transmitting joint axially offers with upper
State the axial pressure transmission hole of annular space connection, pressure transmission hole is connected with pressure transmission pipeline by snap joint, described piston passes through axially all
Four startup shear pins of even distribution are connected with central canal, and are located at the passage between radial direction pressure transmission hole and axial pressure transmission hole.
The surface area of the axial both ends of the surface up and down of described piston is different, and upper surface area is more than lower surface area.
The upper end of described cylinder sleeve connects top connection, and top connection is internal to be sealed by O-ring seal with central canal, and described pressure transmission connects
Head lower end connects lower contact.
Compared to prior art, the invention has the advantages that：
The no chock pressure difference fracturing strings of this self controllable supercharging are applied to horizontal well, inclined shaft and straight well, are sat using supercharging
Envelope controller produces the pressure reduction required for packer setting, takes independent pressure transmission system set packer, packer setting
Do not affected by sand jet outlet size and other kit, oil-separating layer is relatively reliable.In addition the excessively stream of sanding machine sand jet outlet
Area is big, and no chock pressure difference produces, and greatly reduces the abrasion to sand jet outlet in fracturing process, improves the safety of tubing string
Reliability, eliminates the restriction to operational discharge capacity because sand jet outlet area of passage is little simultaneously.
Brief description
Fig. 1 is the structural representation of the no chock pressure difference fracturing strings of self controllable supercharging of the present invention；
Fig. 2 is the structural representation that supercharging sets controller.
In figure：Safety joint 1, anchor 2, supercharging set controller 3, pressure transmission pipeline 4, no throttling pitching pressure break cunning
Set 5, high pressure resistant fracturing packer 6, guide head 7；
Top connection 3-1, central canal 3-2, start shear pin 3-3, piston 3-4, cylinder sleeve 3-5, pressure-transmitting joint 3-6, under
Joint 3-7.
Specific embodiment
Detailed description for the present invention and technology contents, cooperation brief description is as follows, but accompanying drawing only provides with reference to and says
Bright be used, be not used for the present invention is any limitation as.
According to Fig. 1-2, embodiment 1：The no chock pressure difference fracturing strings of self controllable supercharging, including tubular column main body,
Described tubular column main body sets gradually anchor 2 from top to bottom, supercharging sets controller 3, high pressure resistant fracturing packer 6, institute
State supercharging and set controller and connect high pressure resistant fracturing packer also by pressure transmission pipeline 4.Described high pressure resistant fracturing packer is extremely
Arrange a set of less, when pressure break is carried out to multistage, need to configure the high pressure resistant fracturing packer of many sets successively, cover resistance to height more
The setting between any two of pressure fracturing packer no throttles pitching fracturing sliding bush 5, and all of high pressure resistant fracturing packer is also by biography
Pressure pipeline is sequentially connected in series.Described supercharging sets controller and includes central canal 3-2, cylinder sleeve 3-5, and described cylinder sleeve is enclosed within central canal
Piston 3-4, the upper end radial symmetric distribution of described central canal are installed in outside and formation annular space, annular space and central canal between
Two radial direction pressure transmission holes, for connecting center tube cavity and above-mentioned annular space, described cylinder sleeve lower end connects pressure-transmitting joint 3-6, passes
Axially the axial pressure transmission hole connecting with above-mentioned annular space is offered, pressure transmission hole passes through snap joint with pressure transmission pipeline even in crimp head
Connect, described piston is passed through axially equally distributed four startup shear pin 3-3 and is connected with central canal, and is located at radial direction pressure transmission hole
Passage and axial pressure transmission hole between.The surface area of the axial both ends of the surface up and down of described piston is different, under upper surface area is more than
Face area.
Embodiment 2：On the basis of embodiment 1, described tubular column main body also sets up safety joint 1, guide head 7, institute
State safety joint to be located above anchor, guide head is last high pressure resistant fracturing packer positioned at tubular column main body bottom
Lower section.The upper end of described cylinder sleeve connects top connection 3-1, and top connection is internal to be sealed by O-ring seal with central canal, described
Pressure-transmitting joint lower end connects lower contact 3-7.
Generally speaking, tubing string at least configures a set of high pressure resistant pressure break and seal device 6, when pressure break is carried out to multistage, need
Configure the high pressure resistant fracturing packer 6 of many sets in tubing string, cover no throttling pitching fracturing sliding bush 5, high pressure resistant fracturing packer more
Can connected pipes or oil pipe short circuit between 6.High pressure resistant fracturing packer 6 is used for oil-separating layer, realizes effective segmentation pressure
Split, supercharging sets controller 3 lower end and high pressure resistant fracturing packer 6 upper and lower ends are designed with pressure-transmitting joint, by pressure tube
Line 4 is connected with pressure-transmitting joint, the supercharging in tubing string of the present invention is set controller 3, high pressure resistant fracturing packer 6 is connected,
Set by 3 superchargings and control the independent pressure charging system in assembly will to be pressurized the pressure liter setting pressure system in controller 3
Height, and reached high pressure inside high pressure resistant fracturing packer 6 packing element by pressure transmission pipeline 4, make high pressure resistant fracturing packer 6
Packing element is inside and outside to produce the pressure reduction setting required for packing element.Between the high pressure resistant fracturing packer of each two 6, configuration one no throttles
Pitching fracturing sliding bush 5, each pitching fracturing sliding bush 5 that no throttles is designed with multiple sand jet outlets, the area of passage of sand jet outlet is big
Internal no chock pressure difference generation, the pressure break and oil jacket annular space between of the internal diameter of the connected pipes in described tubing string, therefore tubing string
During can reduce the damaged condition to tubing string and its sleeve pipe for the fracturing sand.Supercharging sets the top connection 3-1 lower end of controller
Outside is connected with the upper end of cylinder sleeve 3-5, and inside is sealed by O-ring seal with central canal 3-2, the upper end of central canal 3-2
Two pressure transmission holes of axially symmetric distribution, piston 3-4 passes through axially equally distributed four startup shear pin 3-3 and central canal and connects
Connect, start after shear pin 3-3 cuts off, can slide along central canal 3-2 outer wall, pressure-transmitting joint 3-6 upper end pass through screw thread and
Cylinder sleeve 3-5 connects, and lower end is connected with lower contact 3-7 by screw thread, and pressure-transmitting joint 3-6 has pressure transmission hole, can be by fast
Quick coupling is connected with pressure transmission pipeline.
Taking horizontal well construction as a example.During site operation, when tubing string is down to design attitude, well-flushing, puts into and no save with the first order
The stream ball that matches of pitching fracturing sliding bush 5, for prepad fluid, no throttles the ball of pitching fracturing sliding bush 5 when ball reaches the first order
Seat postpones, and improves discharge capacity, rises high pressure, cuts off the startup shear pin 3-3 that supercharging sets in controller 3, starts supercharging system
System, now in the presence of hydraulic coupling, piston 3-4 is descending along central canal 3-2 outer wall, due to the upper and lower area of piston 3-4
Difference, when piston 3-4 stress reaches balance, the pressure ratio oil pipe of the independent pressure system being connected with pressure transmission pipeline 4
Interior pressure is high, and is reached high pressure inside high pressure resistant fracturing packer 6 packing element by pressure transmission pipeline 4, produces and sets packing element institute
The pressure reduction needing, makes high pressure resistant fracturing packers 6 at different levels set, and continues to rise a high pressure and opens the first order and no throttle pitching
The sliding sleeve of fracturing sliding bush 5, exposes sand jet outlet and carries out pressure break, after completing first paragraph pressure break, puts into and no throttles throwing with the second level
The ball that ball fracturing sliding bush 5 matches, for prepad fluid, no throttles the ball seat position of pitching fracturing sliding bush 5 when ball reaches the second level
Postpone, rise high pressure, open the second level and no throttle the sliding sleeve of pitching fracturing sliding bush 5, expose sand jet outlet and carry out pressure break, with
This analogizes, and completes the pressure break of remaining section, after the completion of pressure break, pressure release, and open flow, oily overpressure reduces, then piston 3-4
Up in the presence of hydraulic coupling, pressure transmission pipeline 4 and high pressure resistant fracturing packer at different levels 6 packing element internal pressure reduce,
Packing element unseals automatically, above lifts tubing string, completes the no chock pressure difference staged fracturing technique process of entirely self controllable supercharging.
The foregoing is only presently preferred embodiments of the present invention, be not used to limit the scope of the claims of the present invention, other use this
The equivalence changes of bright patent spirit, all should all belong to the scope of the claims of the present invention.
Claims (6)
1. the no chock pressure difference fracturing strings of self controllable supercharging, including tubular column main body, it is characterized in that, described tubular column main body sets gradually anchor from top to bottom, supercharging sets controller, high pressure resistant fracturing packer, and described supercharging sets controller and connects high pressure resistant fracturing packer also by pressure transmission pipeline.
2. the no chock pressure difference fracturing strings of self controllable supercharging according to claim 1, it is characterized in that, described high pressure resistant fracturing packer is at least provided with a set of, when pressure break is carried out to multistage, need to configure the high pressure resistant fracturing packer of many sets successively, no throttle pitching fracturing sliding bush in the settings between any two covering high pressure resistant fracturing packer, all of high pressure resistant fracturing packer is sequentially connected in series also by pressure transmission pipeline more.
3. the no chock pressure difference fracturing strings of self controllable supercharging according to claim 2, it is characterized in that, safety joint, guide head are also set up on described tubular column main body, described safety joint is located above anchor, and guide head is positioned at the lower section that tubular column main body bottom is last high pressure resistant fracturing packer.
4. the no chock pressure difference fracturing strings of self controllable supercharging according to claim 1, it is characterized in that, described supercharging sets controller and includes central canal, cylinder sleeve, described cylinder sleeve is enclosed within central canal outside and forms annular space and central canal between, piston is installed in annular space, the upper end radial symmetric of described central canal is distributed two radial direction pressure transmission holes, for connecting center tube cavity and above-mentioned annular space, described cylinder sleeve lower end connects pressure-transmitting joint, axially the axial pressure transmission hole connecting with above-mentioned annular space is offered on pressure-transmitting joint, pressure transmission hole is connected with pressure transmission pipeline by snap joint, described piston is passed through axially equally distributed four startup shear pins and is connected with central canal, and it is located at the passage between radial direction pressure transmission hole and axial pressure transmission hole.
5. it is characterised in that the surface area of the upper and lower both ends of the surface of described piston axial direction is different, upper surface area is more than lower surface area to the no chock pressure difference fracturing strings of self controllable supercharging according to claim 4.
6. it is characterised in that the upper end of described cylinder sleeve connects top connection, top connection is internal to be sealed by O-ring seal the no chock pressure difference fracturing strings of self controllable supercharging according to claim 4 with central canal, and described pressure-transmitting joint lower end connects lower contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510554723.0A CN106481326A (en) | 2015-09-02 | 2015-09-02 | The no chock pressure difference fracturing strings of self controllable supercharging |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510554723.0A CN106481326A (en) | 2015-09-02 | 2015-09-02 | The no chock pressure difference fracturing strings of self controllable supercharging |
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| CN106481326A true CN106481326A (en) | 2017-03-08 |
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| CN201510554723.0A Pending CN106481326A (en) | 2015-09-02 | 2015-09-02 | The no chock pressure difference fracturing strings of self controllable supercharging |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111963135A (en) * | 2020-09-14 | 2020-11-20 | 中国石油集团渤海钻探工程有限公司 | Throttling-free self-service deblocking two-layer fracturing string and fracturing method thereof |
| CN111963134A (en) * | 2020-09-14 | 2020-11-20 | 中国石油集团渤海钻探工程有限公司 | Throttling-free multi-stage separate-layer fracturing pipe column and multi-stage separate-layer fracturing construction method |
| CN112160736A (en) * | 2020-09-14 | 2021-01-01 | 中国石油集团渤海钻探工程有限公司 | Non-throttling sand blasting sliding sleeve |
| CN113266329A (en) * | 2021-06-11 | 2021-08-17 | 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111963135A (en) * | 2020-09-14 | 2020-11-20 | 中国石油集团渤海钻探工程有限公司 | Throttling-free self-service deblocking two-layer fracturing string and fracturing method thereof |
| CN111963134A (en) * | 2020-09-14 | 2020-11-20 | 中国石油集团渤海钻探工程有限公司 | Throttling-free multi-stage separate-layer fracturing pipe column and multi-stage separate-layer fracturing construction method |
| CN112160736A (en) * | 2020-09-14 | 2021-01-01 | 中国石油集团渤海钻探工程有限公司 | Non-throttling sand blasting sliding sleeve |
| CN113266329A (en) * | 2021-06-11 | 2021-08-17 | 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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