CN105089553A - Oil field horizontal well pressurized multi-section fracturing transformation operation valve and reverse well-flushing unfreezing method - Google Patents
Oil field horizontal well pressurized multi-section fracturing transformation operation valve and reverse well-flushing unfreezing method Download PDFInfo
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- CN105089553A CN105089553A CN201510221947.XA CN201510221947A CN105089553A CN 105089553 A CN105089553 A CN 105089553A CN 201510221947 A CN201510221947 A CN 201510221947A CN 105089553 A CN105089553 A CN 105089553A
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- pressure
- horizontal well
- service valve
- fracturing reform
- multistage
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000011010 flushing procedure Methods 0.000 title claims description 21
- 230000009466 transformation Effects 0.000 title abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 238000007789 sealing Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 abstract description 10
- 239000007788 liquid Substances 0.000 abstract description 9
- 238000013461 design Methods 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 abstract description 2
- 230000004048 modification Effects 0.000 abstract description 2
- 238000011001 backwashing Methods 0.000 abstract 3
- 238000005516 engineering process Methods 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 210000000664 rectum Anatomy 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000001802 infusion Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The invention provides an oil field horizontal well pressurized multi-section fracturing transformation operation valve and a backwashing well unfreezing method. By applying the technical scheme of the invention, the valve controls reversing through the steel ball, and can meet the technical requirements of various working conditions such as normal fracturing, plugging of oil pipes and backwashing of pipe columns after jamming and the like. The valve core-free design of the valve can ensure sufficient liquid passing channels in the fracturing modification and backwashing processes, and ensure the long-term working reliability of the valve.
Description
Technical field
The present invention relates to oilfield horizontal well fracture technology field, in particular to a kind of oilfield horizontal well multistage fracturing reform with pressure service valve and anti-flushing well releasing method.
Background technology
Horizontal well is as the technical way improving well yield and transformation development scheme, and the proportion of its quantity and output is all very fast ascendant trend.At present, oil field at home horizontal well development all adopts multistage fracturing reform mode, and wherein jetting technique occupies absolute predominance in oilfield horizontal well multistage fracturing reform.But this technique every section fracturing reform completes needs first pressure release just can be dragged to next section, and the average venting duration of single hop is 5 to 7h.Along with the increase (at present general with close to 10 sections) of hop count and applying of " volume fracturing ", accumulative venting duration is increasing gradually more than 50h.Therefore, the cycle causing oilfield horizontal well multistage fracturing reform to be constructed is long, efficiency is low.
Current, domestic existing oil field starts exploratory experiment oilfield horizontal well multistage fracture technology with pressure, Operating Pressure technology is combined with oilfield horizontal well multistage pressure break.But the oil pipe shutoff between dragging process stage casing with pressure and section becomes the difficult point of this technique.In earlier stage the various valves of Operating Pressure are only applicable to the later development of construction well, as the water injection string etc. of high-pressure water injection well, though can realize the unidirectional shutoff of oil pipe, the spool in fracturing reform process or steel ball, spring etc. very easily damage, existing defects in technique, hinders applying of this technology.
Summary of the invention
Main purpose of the present invention is to provide a kind of oilfield horizontal well multistage fracturing reform with pressure service valve and anti-flushing well releasing method, to solve spool in fracturing reform process of the prior art or the extremely flimsy problem such as steel ball, spring.
To achieve these goals, according to an aspect of the present invention, provide a kind of oilfield horizontal well multistage fracturing reform with pressure service valve, comprise interconnective upper shell and lower shell, one end away from upper shell of lower shell is provided with gear platform, the inner side of gear platform is provided with the sealed steel ball for sealing lower shell, and the barrel of a section between gear platform and upper shell of lower shell has been disposed radially multiple nozzle.
Further, oilfield horizontal well multistage fracturing reform with pressure service valve also comprises the ball seat for coordinating with sealed steel ball, and ball seat to be arranged in upper shell and to arrange towards lower shell.
Further, ball seat is C ring type elastic base, and the inwall of a section of the close lower shell of upper shell is provided with the groove for the annular coordinated with C ring type elastic base, groove is between C ring type elastic base and lower shell.
Further, oilfield horizontal well multistage fracturing reform with pressure service valve also comprises the sliding sleeve be arranged in upper shell, and sliding sleeve is positioned at the side away from lower shell of ball seat, and the side away from ball seat of sliding sleeve is provided with the upper ball base for coordinating with commutation steel ball.
Further, the barrel of upper shell is provided with radial shear pin hole, and sliding sleeve is fixed in upper shell by shear pin.
Further, oilfield horizontal well multistage fracturing reform with pressure service valve also comprises pressing plate, and pressing plate to be arranged in upper shell and to be positioned at the side away from lower shell of sliding sleeve.
Further, oilfield horizontal well multistage fracturing reform with pressure service valve also comprises kick back, and kick back to be arranged in lower shell and to be positioned at the side away from upper shell of gear platform, and kick back is provided with flow channels.
Further, the inwall of lower shell radially offers multiple screwed hole, multiple nozzle is arranged in multiple screwed hole correspondingly.
According to a further aspect in the invention, provide a kind of anti-flushing well releasing method, comprising: provide above-mentioned oilfield horizontal well multistage fracturing reform with pressure service valve as the service valve of fracturing string; Commutation steel ball is put into from the port of the upper shell of oilfield horizontal well multistage fracturing reform with pressure service valve; The pressure improved in fracturing string is greater than the pressure of bottom or sleeve pipe; Stop when well head pressure is greater than wellhead casing pipe pressure 5MPa to 10MPa suppressing; After well head spillway discharge increases, the sealed steel ball of commutation steel ball and oilfield horizontal well multistage with pressure fracturing reform service valve is discharged well head by counter, completes anti-flushing well unfreezing.
Further, well-flushing discharge capacity is controlled at 0.4m
3/ min to 1.0m
3between/min.
Apply technical scheme of the present invention, this valve controls commutation by steel ball, can meet the technical requirements that normal pressure break, shutoff oil pipe and tubing string meet the various operating modes such as the anti-flushing well after blocking." without spool " formula design of this valve can ensure liquid passage excessively sufficient in fracturing reform, anti-flushing well process, ensures its long-term functional reliability.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the sectional view of the embodiment of oilfield horizontal well according to the present invention multistage fracturing reform with pressure service valve.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The object of the present invention is to provide a kind of oilfield horizontal well multistage fracturing reform with pressure special service valve, to meet the technical requirements of various operating mode in the construction of oilfield horizontal well multistage with pressure fracturing reform.
Concrete technology contents of the present invention is as follows:
In this valve upper shell, upper terminal block platform is provided with pressing plate, is provided with sealing ring in cylinder in radial groove, and be provided with radial shear pin hole in the middle part of barrel, the sliding sleeve being provided with upper ball base is fixed in cylinder by shear pin, and be provided with C ring type elastic base below sliding sleeve, in cylinder, lower end is provided with groove; Upper shell lower end connects lower shell by external screw thread, and be connected with nozzle in screwed hole radial on lower shell barrel, in cylinder, bottom is provided with gear platform, is provided with sealed steel ball above gear platform, connects kick back below gear platform.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect: this valve controls commutation by steel ball, can meet the technical requirements that normal pressure break, shutoff oil pipe and tubing string meet the various operating modes such as the anti-flushing well after blocking." without spool " formula design of this valve can ensure liquid passage excessively sufficient in fracturing reform, anti-flushing well process, ensures its long-term functional reliability.Under shutoff oil pipe operating mode, the C ring type elastic base of this valve can coordinate with conventional steel ball smoothly, meets the technical requirements of unidirectional pressure-bearing, and under anti-flushing well operating mode, can discharge natural resiliency, realize self-locking.
With reference to Fig. 1, embodiments of the invention are further illustrated:
This valve mainly comprises pressing plate 1, commutation steel ball 2, sliding sleeve 3, sealing ring 4, shear pin 5, C ring type elastic base 6, upper shell 7, nozzle 8, sealed steel ball 9, kick back 10, lower shell 11.
In upper shell 7, upper terminal block platform is provided with pressing plate 1, be provided with sealing ring 4 in radial groove in cylinder, be provided with radial shear pin hole in the middle part of barrel, the sliding sleeve 3 being provided with upper ball base is fixed in cylinder by shear pin 5, be provided with C ring type elastic base 6 below sliding sleeve 3, in cylinder, lower end is provided with groove.Upper shell 7 lower end connects lower shell 11 by external screw thread, and be connected with two-layer nozzle 8 in screwed hole radial on lower shell 11 barrel, in cylinder, bottom is provided with gear platform, is provided with sealed steel ball 9 above gear platform, is threaded connection kick back 10 below gear platform.
By C ring type elastic base 6 from predeterminated position in upper shell 7 upper end press-in cylinder, sealing ring 4 is loaded an inner groovy, sliding sleeve 3 to be inserted in cylinder to C ring type elastic base 6 position, shear pin 5 is screwed in from cylinder and fixes sliding sleeve 3, then pressing plate 1 is filled in gear platform from cylinder upper end.Screw in its screwed hole from lower shell 11 cylindrical after nozzle 8 is coated high duty metal glue to fix, kick back 10 is coated high duty metal glue and then penetrate from cylinder lower end and be threaded in below gear platform, then sealed steel ball 9 is put into from lower shell 11 upper end.Finally, upper shell 7 is threaded with lower shell 11, the normal work of this valve can be realized.
The working mechanism of this valve is as follows:
1, normal pressure break:
In pressure break (fluid infusion of oil pipe pressure break annular space, the fluid infusion of annular fracturing oil pipe) process, (comprise abrasive perforating in early stage), ball-and-seat blocking operating tool string lower end, liquid is pressed into stratum (or ejection) from nozzle 8.Now, sealed steel ball 9 is between orlop nozzle 8 and kick back 10, and the static pressure state residing for this region can protect steel ball not by the erosion adding sand liquid, carries out the operation of " without spool " formula simultaneously, can ensure that fracturing liquid runner is unimpeded in valve.
2, shutoff oil pipe:
When the complete rear oil pipe pressure release of construction section pressure break, liquid pours into oil pipe inside from ball-and-seat and nozzle 8 simultaneously, through the feed liquor of nozzle 8 along lower shell 11 radial impact, through the feed liquor of ball-and-seat along cylindrical shell axial impact, (the equivalent latus rectum now due to nozzle 8 is less by the hydraulic shock on two directions for sealed steel ball 9, if 73mm oil pipe latus rectum is about 20mm, ball-and-seat latus rectum is not less than 40mm) and on move, through upper shell 7 lower end to C ring type elastic base 6 place's shutoff oil pipe.Now, wellheadpressure apparatus for work or blowout preventer set can be adopted to coordinate, and drag fracturing tubing string is to next section.When pressure break again, oil pipe is suppressed and is caused sealed steel ball 9 and leave C ring type elastic base 6, meanwhile, and ball-and-seat blocking operating tool string lower end, liquid only can be pressed into stratum (or ejection) from nozzle 8, and sealed steel ball 9 is rushed between orlop nozzle 8 and kick back 10.
Repeat above flow process, all intersegmental shutoff operations of oilfield horizontal well multistage with pressure fracturing reform can be realized.
3, anti-flushing well:
When the complete rear oil pipe pressure release of construction section pressure break, sealed steel ball 9 moves to C ring type elastic base 6 shutoff oil pipe.At drag fracturing tubing string in next section of process, if fracturing string meet card (the non-deblocking of packer or tubing string sand card etc.) and up and down tubing string can not separate the unfreezing of calorie requirement anti-flushing well time, throw commutation steel ball 2 from oil pipe and suppress (now first record wellhead casing pipe pressure).When tubing pressure is greater than stratum (or sleeve pipe) pressure, sealed steel ball 9 moves to kick back 10 position, hydraulic shock commutation steel ball 2 to sliding sleeve 3 lower end, and now, well head pressure can slightly raise moment.Improve pressure to stop suppressing to when being greater than wellhead casing pipe pressure 5MPa to 10MPa, in the process, sliding sleeve 3 promotes C ring type elastic base 6 and is displaced downwardly in the groove of upper shell 7 lower end, cuts off shear pin 5 simultaneously, flicks and realize self-locking.C ring type elastic base 6 is compressed in O type when being in smaller channels, can bear high pressure by fitted seal steel ball 9, and be pushed to upper shell 7 compared with C-shaped when flicking in big groove, ensures that the sealed steel ball 9 of major path passes through smoothly.When (guaranteeing that valve commutates after oil pipe pressure release, detect by well head spillway discharge, as spillway discharge very greatly and continually then this valve commutate), anti-flushing well unfreezing can be carried out, now, commutation steel ball 2 and sealed steel ball 9 return under liquid impacts jointly in anti-flushing well discharge capacity and stratum and move along on fracturing string inside, finally discharged well head by counter (well-flushing discharge capacity general control is at 0.4m
3/ min to 1.0m
3/ min).
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an oilfield horizontal well multistage fracturing reform with pressure service valve, it is characterized in that, comprise interconnective upper shell (7) and lower shell (11), one end away from described upper shell (7) of described lower shell (11) is provided with gear platform, the inner side of described gear platform is provided with the sealed steel ball (9) for sealing described lower shell (11), and the barrel of a section being positioned between described gear platform and described upper shell (7) of described lower shell (11) has been disposed radially multiple nozzle (8).
2. oilfield horizontal well according to claim 1 multistage fracturing reform with pressure service valve, it is characterized in that, described oilfield horizontal well multistage with pressure fracturing reform service valve also comprises the ball seat for coordinating with described sealed steel ball (9), and described ball seat to be arranged in described upper shell (7) and to arrange towards described lower shell (11).
3. oilfield horizontal well according to claim 2 multistage fracturing reform with pressure service valve, it is characterized in that, described ball seat is C ring type elastic base (6), the inwall of one section of the close described lower shell (11) of described upper shell (7) is provided with the groove for the annular coordinated with described C ring type elastic base (6), described groove is positioned between described C ring type elastic base (6) and described lower shell (11).
4. oilfield horizontal well according to claim 2 multistage fracturing reform with pressure service valve, it is characterized in that, described oilfield horizontal well multistage with pressure fracturing reform service valve also comprises the sliding sleeve (3) be arranged in described upper shell (7), described sliding sleeve (3) is positioned at the side away from described lower shell (11) of described ball seat, and the side away from described ball seat of described sliding sleeve (3) is provided with the upper ball base for coordinating with commutation steel ball (2).
5. oilfield horizontal well according to claim 4 multistage fracturing reform with pressure service valve, it is characterized in that, the barrel of described upper shell (7) is provided with radial shear pin hole, and described sliding sleeve (3) is fixed in described upper shell (7) by shear pin (5).
6. oilfield horizontal well according to claim 4 multistage fracturing reform with pressure service valve, it is characterized in that, described oilfield horizontal well multistage fracturing reform with pressure service valve also comprises pressing plate (1), and described pressing plate (1) to be arranged in described upper shell (7) and to be positioned at the side away from described lower shell (11) of described sliding sleeve (3).
7. oilfield horizontal well according to claim 1 multistage fracturing reform with pressure service valve, it is characterized in that, described oilfield horizontal well multistage fracturing reform with pressure service valve also comprises kick back (10), described kick back (10) to be arranged in described lower shell (11) and to be positioned at the side away from described upper shell (7) of described gear platform, and described kick back (10) is provided with flow channels.
8. oilfield horizontal well according to claim 1 multistage fracturing reform with pressure service valve, it is characterized in that, the inwall of described lower shell (11) radially offers multiple screwed hole, and described multiple nozzle (8) is arranged in described multiple screwed hole correspondingly.
9. an anti-flushing well releasing method, is characterized in that, comprising:
There is provided the multistage fracturing reform with pressure of the oilfield horizontal well according to any one of claim 4 to 6 service valve as the service valve of fracturing string;
Described commutation steel ball (2) is put into from the port of the upper shell (7) of described oilfield horizontal well multistage with pressure fracturing reform service valve;
The pressure improved in described fracturing string is greater than the pressure of bottom or sleeve pipe;
Stop when well head pressure is greater than wellhead casing pipe pressure 5MPa to 10MPa suppressing;
After well head spillway discharge increases, described commutation steel ball (2) is discharged well head with the sealed steel ball (9) of described oilfield horizontal well multistage with pressure fracturing reform service valve by counter, completes anti-flushing well unfreezing.
10. anti-flushing well releasing method according to claim 9, is characterized in that, controls well-flushing discharge capacity at 0.4m
3/ min to 1.0m
3between/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510221947.XA CN105089553B (en) | 2014-05-14 | 2015-05-04 | Oil field horizontal well pressurized multi-section fracturing transformation operation valve and reverse well-flushing unfreezing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2014102035240 | 2014-05-14 | ||
| CN201410203524 | 2014-05-14 | ||
| CN201510221947.XA CN105089553B (en) | 2014-05-14 | 2015-05-04 | Oil field horizontal well pressurized multi-section fracturing transformation operation valve and reverse well-flushing unfreezing method |
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| CN105089553A true CN105089553A (en) | 2015-11-25 |
| CN105089553B CN105089553B (en) | 2018-01-02 |
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| CN201510221947.XA Active CN105089553B (en) | 2014-05-14 | 2015-05-04 | Oil field horizontal well pressurized multi-section fracturing transformation operation valve and reverse well-flushing unfreezing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108678694A (en) * | 2018-05-22 | 2018-10-19 | 威海鸿通管材股份有限公司 | Flushing valve and oil production equipment |
| CN112377103A (en) * | 2020-10-30 | 2021-02-19 | 中国地质大学（武汉） | Pressure feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device |
| CN114542008A (en) * | 2020-11-24 | 2022-05-27 | 华鼎鸿基石油工程技术(北京)有限公司 | Locking ball seat and pigging well-washing fracturing integrated pipe column |
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| CN103470239A (en) * | 2013-08-20 | 2013-12-25 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Pressurized-dragging continuous fracturing process |
| CN204804766U (en) * | 2014-05-14 | 2015-11-25 | 中国石油天然气股份有限公司 | Oil field horizontal well pressurized multi-section fracturing transformation operation valve |
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2015
- 2015-05-04 CN CN201510221947.XA patent/CN105089553B/en active Active
Patent Citations (6)
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| CN201090178Y (en) * | 2007-09-18 | 2008-07-23 | 中国石油天然气股份有限公司 | Sliding sleeve switch for fracturing and acidizing of horizontal well |
| US20130043042A1 (en) * | 2011-08-19 | 2013-02-21 | Weatherford/Lamb, Inc. | Multiple Shift Sliding Sleeve |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108678694A (en) * | 2018-05-22 | 2018-10-19 | 威海鸿通管材股份有限公司 | Flushing valve and oil production equipment |
| CN112377103A (en) * | 2020-10-30 | 2021-02-19 | 中国地质大学（武汉） | Pressure feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device |
| CN112377103B (en) * | 2020-10-30 | 2021-12-10 | 中国地质大学（武汉） | Pressure feed type horizontal directional drilling engineering geological exploration hydraulic fracturing test device |
| CN114542008A (en) * | 2020-11-24 | 2022-05-27 | 华鼎鸿基石油工程技术(北京)有限公司 | Locking ball seat and pigging well-washing fracturing integrated pipe column |
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| CN105089553B (en) | 2018-01-02 |
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