CN110359894B - Hydraulic fracturing pressure relief method and device - Google Patents
Hydraulic fracturing pressure relief method and device Download PDFInfo
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- CN110359894B CN110359894B CN201910563633.6A CN201910563633A CN110359894B CN 110359894 B CN110359894 B CN 110359894B CN 201910563633 A CN201910563633 A CN 201910563633A CN 110359894 B CN110359894 B CN 110359894B
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- 238000000034 method Methods 0.000 title claims abstract description 109
- 239000012528 membrane Substances 0.000 claims abstract description 121
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 81
- 238000002347 injection Methods 0.000 claims abstract description 47
- 239000007924 injection Substances 0.000 claims abstract description 47
- 230000007246 mechanism Effects 0.000 claims description 17
- 238000005553 drilling Methods 0.000 claims description 8
- 239000003245 coal Substances 0.000 abstract description 9
- 230000006378 damage Effects 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 208000027418 Wounds and injury Diseases 0.000 description 5
- 208000014674 injury Diseases 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
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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
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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention relates to the technical field of coal mine roadway equipment, in particular to a hydraulic fracturing pressure relief method and device. The method comprises a pressure relief process, wherein the pressure relief process comprises the following steps: s1, relieving the pressure of the lower elastic membrane of the packer at the lower end of the fracturing section set in the target hole to an unfilled state so as to enable accumulated water in the fracturing section to flow out along the target hole; s2, releasing pressure of an elastic membrane on a packer which is set at the upper end of the fracturing section in the target hole to an un-pressurized state, so that accumulated water remaining above the fracturing section flows out along the target hole; and S3, moving out the water injection pipe connected to the packer. The pressure relief process of the method is divided into two times of pressure relief, the pressure relief work of the upper elastic membrane and the lower elastic membrane can be independently completed, and even if water stored in the target hole is in a high-pressure state in the pressure relief process of the lower elastic membrane, the stable state can be kept by means of setting of the upper elastic membrane, so that the problem that a water injection pipe rapidly breaks out due to one-time pressure relief of a packer in the traditional hydraulic fracturing pressure relief process is solved.
Description
Technical Field
The invention relates to the technical field of coal mine roadway equipment, in particular to a hydraulic fracturing pressure relief method and device.
Background
The coal mine tunnel hydraulic fracturing technology has become an important means for solving the problems of initial mining and initial discharge and dynamic pressure tunnel pressure relief of a working face of a coal mine. When the existing hydraulic fracturing technology is operated, a section of exposed drilled hole of bedrock is taken firstly, the upper end and the lower end of the drilled hole are sealed by a packer, then liquid is injected, and the drilled hole is pressurized until the hole wall is broken.
A straddle type expandable drilling packer is usually adopted in the coal mine tunnel hydraulic fracturing technology, and the realization of multi-stage fracturing of the same drilled hole is facilitated. Two elastic membranes are with same inflation pipe series control about striding formula expansibility drilling packer, and two elastic membranes shrink simultaneously during the pressure release, and the pressure release is once accomplished, but discovery in site operation, after packer pressure release to drilling no water flow overflow, when withdrawing from the packer, the water injection iron pipe sometimes can be with extremely fast speed, huge inertia rush out the drilling, disembarkation ground or resilience, and the harmfulness is very big.
Disclosure of Invention
Technical problem to be solved
The embodiment of the invention provides a hydraulic fracturing pressure relief method and a hydraulic fracturing pressure relief device, which are used for solving the problem that in the pressure relief process after staged fracturing is finished in the conventional hydraulic fracturing method, a water injection iron pipe always moves out at a very high speed, so that great danger is caused.
(II) technical scheme
In order to solve the technical problem, the invention provides a hydraulic fracturing pressure relief method, which comprises a pressure relief process, wherein the pressure relief process comprises the following steps:
s1, relieving the pressure of the lower elastic membrane of the packer at the lower end of the fracturing section set in the target hole to an unfilled state so as to enable accumulated water in the fracturing section to flow out along the target hole completely;
s2, releasing pressure of an elastic membrane on a packer which is set at the upper end of the fracturing section in the target hole to an un-pressurized state, so that accumulated water remaining above the fracturing section flows out along the target hole;
and S3, moving out the water injection pipe connected to the packer.
In some embodiments, prior to the pressure relief procedure, the method further comprises a fracturing procedure, the fracturing procedure comprising the steps of:
n1, respectively pushing an upper elastic membrane and a lower elastic membrane of the packer into the target hole until the upper elastic membrane and the lower elastic membrane are respectively positioned at two ends of the fracturing section;
n2, pressurizing the upper elastic membrane and the lower elastic membrane respectively to enable the upper elastic membrane and the lower elastic membrane to expand and set respectively;
n3, injecting water into the fracturing segment to pressurize so as to fracture the side wall of the fracturing segment under pressure.
In some embodiments, the step N3 further includes:
the water injection pipe is communicated with the fracturing section, and water is injected into the fracturing section through the water injection pipe to be pressurized.
In some embodiments, the upper elastic membrane and the lower elastic membrane are respectively connected with a conduit, the conduit of the upper elastic membrane and the conduit of the lower elastic membrane are not communicated, and the two conduits respectively extend outwards from the target hole.
In some embodiments, the water injection pipe penetrates through the lower elastic membrane and is sleeved outside the conduit of the upper elastic membrane.
In some embodiments, the extension section of the conduit of the upper elastic membrane is provided with an upper stop valve.
In some embodiments, the extension section of the conduit of the lower elastic membrane is provided with a lower stop valve.
In some embodiments, before the step N1, the method further includes:
n0, drilling obliquely in the seam to obtain the target hole.
In some embodiments, the method further comprises:
and circulating the fracturing procedure and the pressure relief procedure for multiple times in sequence to finish multiple fracturing operations of the same target hole.
The invention also provides a hydraulic fracturing pressure relief device, which comprises:
the first pressure relief mechanism is used for relieving the pressure of the lower elastic membrane of the packer at the lower end of the fracturing section which is set in the target hole to an unpressurized state;
the second pressure relief mechanism is used for relieving the pressure of an elastic membrane on a packer which is arranged at the upper end of the fracturing section in the target hole to an unpressurized state;
the drainage mechanism is used for leading out accumulated water in the target hole;
and the dismounting mechanism is used for moving out the water injection pipe connected to the packer.
(III) advantageous effects
The technical scheme of the invention has the following beneficial effects: the hydraulic fracturing pressure relief method comprises a pressure relief process, wherein the pressure relief process comprises the following steps: s1, relieving the pressure of the lower elastic membrane of the packer at the lower end of the fracturing section set in the target hole to an unfilled state so as to enable accumulated water in the fracturing section to flow out along the target hole; s2, releasing pressure of an elastic membrane on a packer which is set at the upper end of the fracturing section in the target hole to an un-pressurized state, so that accumulated water remaining above the fracturing section flows out along the target hole; and S3, moving out the water injection pipe connected to the packer. The method is divided into two times of pressure relief in the pressure relief process after staged fracturing is finished, so that the pressure relief work of the upper elastic membrane and the lower elastic membrane can be independently finished, high-pressure water accumulated in a target hole can flow out along the hole after the pressure relief of the lower elastic membrane is finished, even if the water stored in the target hole is in a high-pressure state in the pressure relief process of the lower elastic membrane, the stable state can be kept by means of the setting of the upper elastic membrane, so that the water injection pipe cannot be rapidly flushed out of the target hole to cause equipment damage or injury, the problem that the water injection pipe rapidly escapes from the target hole due to one-time pressure relief of a packer in the conventional hydraulic fracturing pressure relief process is solved, because the hydraulic fracturing pressure relief process usually needs human participation, the hydraulic fracturing pressure relief method and the hydraulic fracturing pressure relief device greatly improve the safety of the hydraulic fracturing pressure relief process in coal mine operation.
On the other hand, when the traditional hydraulic fracturing pressure relief method and device are used for pressure relief, the phenomenon that a water injection pipe is blown out is more, so that a large number of water injection pipes are bent and have to be replaced; the hydraulic fracturing pressure relief method and the hydraulic fracturing pressure relief device can effectively control the phenomenon of the water injection pipe, and reduce material loss.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a block flow diagram of a pressure relief process in a hydraulic fracturing pressure relief method according to an embodiment of the invention;
FIG. 2 is a block flow diagram of a fracturing process in a hydraulic fracturing pressure relief method according to an embodiment of the present invention;
fig. 3 is a structural diagram of a hydraulic fracturing pressure relief device according to an embodiment of the invention.
Wherein, 1, an elastic film is arranged; 2. a lower elastic film; 3. a conduit; 4. a water injection pipe; 5. an upper stop valve; 6. a lower stop valve; 7. and (4) fracturing the section.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, the present embodiment provides a hydraulic fracturing pressure relief method. The method comprises a pressure relief process, wherein the pressure relief process comprises the following steps:
s1, relieving the pressure of the elastic membrane 2 below the packer, which is arranged at the lower end of the fracturing section 7 in the target hole, to an unfilled state so as to enable accumulated water in the fracturing section 7 to flow out along the target hole;
s2, releasing the pressure of the elastic membrane 1 on the packer at the upper end of the fracturing section 7 set in the target hole to an un-pressurized state so as to enable accumulated water remaining above the fracturing section 7 to flow out along the target hole;
and S3, moving out the water injection pipe 4 connected to the packer.
Wherein, the packer is preferably a straddle type drilling packer, and other packers can be adopted as long as the upper end and the lower end of the fracturing section 7 can be sealed. The packer includes elastic membrane 1 and elastic membrane 2 down, and water injection pipe 4 is connected with the packer to be connected with the fracturing section 7 of target hole, water injection pipe 4 is used for at last elastic membrane 1 with elastic membrane 2 down sit behind the upper and lower both ends of sealing respectively at fracturing section 7, inject the water under high pressure into fracturing section 7, thereby with the lateral wall fracturing of fracturing section 7.
In step S1, when the accumulated water in the fracturing section 7 completely flows out along the target hole, the upper elastic membrane 1 is still in the setting state, and at this time, the accumulated high-pressure water in the target hole is not in the uncontrolled state due to the pressure relief of the lower elastic membrane 2 of the packer.
The method described in this embodiment divides the pressure relief process after the staged fracturing is completed into two independent pressure relief steps to improve the setting capability of the packer, and ensure that the pressure relief work of the upper elastic membrane 1 and the lower elastic membrane 2 of the packer can be completed independently, thereby ensuring that a part of high-pressure water stored in the target hole can flow out along the hole after the pressure relief of the lower elastic membrane 2, so that even if the stored water in the target hole is in a high-pressure state in the pressure relief process of the lower elastic membrane 2, the stable state can be maintained by means of the setting of the upper elastic membrane 1, and the situation that the pressure in the target hole is too high after the pressure relief of the lower elastic membrane 2 causes the water injection pipe 4 to rapidly rush out of the target hole to cause equipment damage or injury can be avoided.
The method can solve the problem that the water injection pipe 4 rapidly breaks out due to one-time pressure relief of the packer in the traditional hydraulic fracturing pressure relief process. On one hand, the hydraulic fracturing pressure relief process usually needs human participation, and the rapid fleeing of the water injection pipe 4 is easy to cause personnel injury, so that the safety of the hydraulic fracturing pressure relief process in coal mine operation is greatly improved. On the other hand, when the traditional hydraulic fracturing pressure relief method and device are used for pressure relief, the phenomenon that the water injection pipe 4 leaks out is more, so that a large number of water injection pipes 4 are bent and have to be replaced; the hydraulic fracturing pressure relief method and the hydraulic fracturing pressure relief device can effectively control the phenomenon of the water injection pipe 4, and reduce material loss.
Further, before the pressure relief process, the method also comprises a fracturing process.
Specifically, as shown in fig. 2, the fracturing process includes the following steps:
n1, simultaneously pushing the upper elastic membrane 1 and the lower elastic membrane 2 of the packer into a target hole until the upper elastic membrane 1 and the lower elastic membrane 2 are respectively positioned at two ends of the fracturing section 7;
n2, respectively pressurizing the upper elastic membrane 1 and the lower elastic membrane 2 to enable the upper elastic membrane 1 and the lower elastic membrane 2 to respectively expand and set;
n3, injecting water into the fracturing section 7 to pressurize and fracture the side wall of the fracturing section 7.
The fracturing process further includes, before step N1:
n0, drilling diagonally into the seam to obtain the target hole.
In the pressure relief process and the fracturing process, step N3 further includes:
the N31 and the water injection pipe 4 are communicated with the fracturing section 7, and water is injected into the fracturing section 7 through the water injection pipe 4 for pressurization.
In some preferred embodiments, the upper elastic membrane 1 and the lower elastic membrane 2 are connected with a conduit 3 respectively, and the upper elastic membrane 1 and the lower elastic membrane 2 can be pressurized or depressurized respectively through the two conduits 3. The conduit 3 of the upper elastic membrane 1 is not communicated with the conduit 3 of the lower elastic membrane 2, so that the pressurizing process and the pressure relief process of the upper elastic membrane 1 and the lower elastic membrane 2 are controlled in parallel, namely the pressurizing process and the pressure relief process of the upper elastic membrane 1 and the lower elastic membrane 2 can be respectively and independently completed, and the pressurizing setting and the pressure relief recovery of the two elastic membranes 1 and 2 are not interfered with each other.
In order to facilitate the control of the pressurization and depressurization of the two elastic membranes 1, 2, in some preferred embodiments, two conduits 3 extend from the targeting orifice. An upper stop valve 5 is arranged on the extending section of the conduit 3 of the upper elastic membrane 1. The extension section of the conduit 3 of the lower elastic membrane 2 is provided with a lower stop valve 6. When step S1, step S2, or step N2 is performed, the pressurizing process and the depressurizing process of the upper elastic membrane 1 and the lower elastic membrane 2 can be independently performed by controlling the open/close states of the upper cut valve 5 and the lower cut valve 6, respectively. The water injection pipe 4 penetrates the lower elastic membrane 2 and extends outwards from the target hole. The water injection pipe 4 is sleeved outside the conduit 3 of the upper elastic membrane 1, so that the conduit 3 of the upper elastic membrane 1 is isolated from the inner cavity of the lower elastic membrane 2 by the water injection pipe 4, and the pressurization setting and the pressure relief recovery of the two elastic membranes 1 and 2 are not interfered with each other.
It can be understood that, in order to avoid the danger caused by the over-high pressure in the target hole, in the method of the embodiment, the upper elastic membrane 1 and the lower elastic membrane 2 of the packer must be clearly distinguished, and the upper stop valve 5 and the lower stop valve 6 are strictly prohibited to be opened firstly and then when the pressure is relieved. In other words, the upper elastic membrane 1 is strictly prohibited to be decompressed before the lower elastic membrane 2 is decompressed, because if the upper elastic membrane 1 is firstly decompressed, high-pressure water on the upper portions of the fracturing section and the fracturing section jointly applies pressure to the lower elastic membrane 2, so that excessive pressure bearing of the lower elastic membrane 2 is caused, and the setting failure is easy to occur, and when the setting failure of the lower elastic membrane 2 is caused, the excessive high-pressure water blocked above the lower elastic membrane 2 directly flushes out the water injection pipe 4, so that danger is generated to operators and equipment.
Further, the hydraulic fracturing pressure relief method according to the embodiment further includes:
and (3) circulating step: and circulating the fracturing procedure and the pressure relief procedure for multiple times in sequence to finish multiple fracturing operations of the same target hole.
Because the pressure of packer can be relieved through the pressure release process after single fracturing process finishes to make the downthehole high pressure water that seals up of target lose pressure and flow out along the hole. The diameter of the packer is smaller than that of the target hole, so that the packer can be manually unloaded and re-pressurized after the pressure is released and the packer is restored to an un-pressurized state, and then the next stage of fracturing procedure is carried out, and multiple safe fracturing of the same target hole is realized.
Based on the hydraulic fracturing pressure relief method, the embodiment also provides a hydraulic fracturing pressure relief device. As shown in fig. 3, the device utilizes the method to effectively avoid the dangerous situation that the water injection pipe 4 escapes at an extremely high speed in the pressure relief process after the completion of any staged fracturing process of hydraulic fracturing in the coal mine tunnel, and effectively prevent the equipment damage or other safety accidents caused by the ejection of the water injection pipe 4.
The device described in this embodiment includes a first pressure relief mechanism, a second pressure relief mechanism, a drainage mechanism, and a removal mechanism. The first pressure relief mechanism is used for relieving the lower elastic membrane 2 of the packer, which is arranged at the lower end of the fracturing section 7 in the target hole, to an unpressurized state; the second pressure relief mechanism is used for relieving the pressure of the elastic membrane 1 on the packer at the upper end of the fracturing section 7 which is set in the target hole to an unpressurized state. The first and second pressure relief mechanisms are independent of each other to achieve independent control of the pressurization and pressure relief processes of the upper and lower elastic membranes 1 and 2. The drainage mechanism is used for leading out accumulated water in the target hole. The removal mechanism is used to remove the injection pipe 4 attached to the packer.
It will be appreciated that the water injection pipe 4 is preferably a metal pipe to improve bearing strength, and an iron pipe is used in this embodiment. The ducts 3 of the upper elastic membrane 1 and the ducts 3 of the lower elastic membrane 2 are both resin high-pressure tubes. The pressurizing process and the pressure releasing process of the upper elastic membrane 1 and the lower elastic membrane 2 may be respectively realized by a pressurizing pump and a pressure releasing pump.
In summary, the hydraulic fracturing pressure relief method of the embodiment includes a pressure relief process, and the pressure relief process includes the following steps: s1, relieving the pressure of the elastic membrane 2 below the packer, which is arranged at the lower end of the fracturing section 7 in the target hole, to an unfilled state so as to enable accumulated water in the fracturing section 7 to flow out along the target hole; s2, releasing the pressure of the elastic membrane 1 on the packer at the upper end of the fracturing section 7 set in the target hole to an un-pressurized state so as to enable accumulated water above the fracturing section 7 to flow out along the target hole; and S3, moving out the water injection pipe 4 connected to the packer. The method is divided into two times of pressure relief in the pressure relief process after staged fracturing is finished, so that the pressure relief work of the upper elastic membrane 1 and the lower elastic membrane 2 can be independently finished, thereby ensuring that the high-pressure water accumulated in the target hole can flow out along the hole after the pressure of the lower elastic membrane 2 is relieved, even if the water stored in the target hole is in a high-pressure state in the pressure relief process of the lower elastic membrane 2, the stable state can be kept by means of the setting of the upper elastic membrane 1, so that the water injection pipe 4 cannot be rapidly flushed out of the target hole to cause equipment damage or injury, the problem that the water injection pipe 4 rapidly flees out due to one-time pressure relief of a packer in the conventional hydraulic fracturing pressure relief process is solved, because the hydraulic fracturing pressure relief process usually needs human participation, the rapid escape of the water injection pipe 4 is easy to cause personnel injury, and the hydraulic fracturing pressure relief method and the hydraulic fracturing pressure relief device greatly improve the safety of the hydraulic fracturing pressure relief process in coal mine operation.
On the other hand, when the traditional hydraulic fracturing pressure relief method and device are used for pressure relief, the phenomenon that the water injection pipe 4 leaks out is more, so that a large number of water injection pipes 4 are bent and have to be replaced; the hydraulic fracturing pressure relief method and the hydraulic fracturing pressure relief device can effectively control the phenomenon of the water injection pipe 4, and reduce material loss.
The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (10)
1. A hydraulic fracturing pressure relief method is characterized by comprising a pressure relief process, wherein the pressure relief process comprises the following steps:
s1, relieving the pressure of the lower elastic membrane of the packer at the lower end of the fracturing section set in the target hole to an unfilled state so as to enable accumulated water in the fracturing section to flow out along the target hole completely;
s2, releasing pressure of an elastic membrane on a packer which is set at the upper end of the fracturing section in the target hole to an un-pressurized state, so that accumulated water above the fracturing section flows out along the target hole completely;
and S3, moving out the water injection pipe connected to the packer.
2. The hydraulic fracture depressurization method of claim 1, further comprising a fracturing procedure prior to the depressurization procedure, the fracturing procedure comprising the steps of:
n1, simultaneously pushing an upper elastic membrane and a lower elastic membrane of the packer into the target hole until the upper elastic membrane and the lower elastic membrane are respectively positioned at two ends of the fracturing section;
n2, pressurizing the upper elastic membrane and the lower elastic membrane respectively to enable the upper elastic membrane and the lower elastic membrane to expand and set respectively;
n3, injecting water into the fracturing segment to pressurize so as to fracture the side wall of the fracturing segment under pressure.
3. The hydraulic fracture pressure relief method of claim 2, wherein the N3 further comprises:
the water injection pipe is communicated with the fracturing section, and water is injected into the fracturing section through the water injection pipe to be pressurized.
4. The hydraulic fracturing pressure relief method of claim 3, wherein the upper elastic membrane and the lower elastic membrane are connected with conduits respectively, the conduits of the upper elastic membrane and the conduits of the lower elastic membrane are not communicated, and the two conduits respectively extend outwards from the target hole.
5. The hydraulic fracturing pressure relief method of claim 4, wherein the water injection pipe penetrates through the lower elastic membrane and is sleeved outside the conduit of the upper elastic membrane.
6. The hydraulic fracturing pressure relief method of claim 4, wherein the extension section of the conduit of the upper elastic membrane is provided with an upper stop valve.
7. The hydraulic fracturing pressure relief method of claim 4, wherein the extension section of the conduit of the lower elastic membrane is provided with a lower stop valve.
8. The hydraulic fracture pressure relief method according to any one of claims 2-7, further comprising the following steps before the N1:
n0, drilling obliquely in the seam to obtain the target hole.
9. The hydraulic fracture pressure relief method of any one of claims 2-7, further comprising:
and circulating the fracturing procedure and the pressure relief procedure for multiple times in sequence to finish multiple fracturing operations of the same target hole.
10. A hydraulic fracturing pressure relief device, comprising:
the first pressure relief mechanism is used for relieving the pressure of the lower elastic membrane of the packer at the lower end of the fracturing section which is set in the target hole to an unpressurized state;
the second pressure relief mechanism is used for relieving the pressure of an elastic membrane on a packer which is arranged at the upper end of the fracturing section in the target hole to an unpressurized state;
the drainage mechanism is used for leading out accumulated water in the target hole;
and the dismounting mechanism is used for moving out the water injection pipe connected to the packer.
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| CN102852522B (en) * | 2012-04-01 | 2014-09-10 | 天地科技股份有限公司 | Hydraulic fracturing method and device for releasing pressure of coal mine tunnel |
| CN102704905A (en) * | 2012-06-11 | 2012-10-03 | 煤炭科学研究总院沈阳研究院 | Segmental hydraulic fracturing coal seam pressure releasing device and method |
| CN103953317B (en) * | 2014-04-14 | 2017-02-15 | 宝鸡市赛孚石油机械有限公司 | High-reliability hydraulic ejector |
| CN105178934A (en) * | 2015-09-24 | 2015-12-23 | 中国石油天然气股份有限公司 | Horizontal well no-throttle straddle-type double-sealing single-grip fracturing process |
| CN108678721A (en) * | 2018-06-15 | 2018-10-19 | 吕梁学院 | Packaged type hydraulic fracturing and injection hole sealing integrated apparatus and its construction method |
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2019
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