CN105156067B - Coal mine underground hydraulic fracturing drilling and hole sealing device and method - Google Patents
Coal mine underground hydraulic fracturing drilling and hole sealing device and method Download PDFInfo
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- CN105156067B CN105156067B CN201510648336.3A CN201510648336A CN105156067B CN 105156067 B CN105156067 B CN 105156067B CN 201510648336 A CN201510648336 A CN 201510648336A CN 105156067 B CN105156067 B CN 105156067B
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- pressure break
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- grouting
- tube
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- 238000007789 sealing Methods 0.000 title claims abstract description 44
- 239000003245 coal Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005553 drilling Methods 0.000 title claims description 40
- 239000002002 slurry Substances 0.000 claims abstract description 73
- 239000004568 cement Substances 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 238000007569 slipcasting Methods 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a device and a method for sealing a coal mine underground hydraulic fracturing drilled hole, which comprises a fracturing pipe, a grouting pipe and a slurry return pipe, wherein the foremost end of the fracturing pipe is positioned at the bottom of the fracturing drilled hole; the device not only can master the amount of injected mortar and the position far away from a coal bed, ensures that the hole sealing layer is positioned in the coal bed, avoids the tail end of the fracturing pipe from being blocked by cement to cause the abandonment of a fracturing drill hole, but also can solve the problem that the sealing strength cannot be ensured because the fracturing pipe is tightly attached to the hole wall after being placed down, and can ensure that no water is leaked in the hydraulic fracturing process after the fracturing drill hole is sealed.
Description
Technical field
The present invention relates to underground coal mine hydraulic fracturing technical field, in particular to a kind of underground coal mine hydraulic fracturing drilling envelope
Aperture apparatus and method.
Background technique
Coal-bed gas is a kind of clear energy sources, but is then a kind of disaster source for coal production, how to realize coal mining
The pre- pumping of preceding gas, reaches the dual purpose of resources development and utilization and coal mine mitigation, is always focus concerned by people.Waterpower pressure
Split a kind of a kind of new process for integrating region and local gas control precisely in order to meeting this production requirement and being born.
In the prior art, the drilling and sealing technology in hydraulic fracturing technology mainly has cement slurry once grouting sealing of hole and waterpower
The dedicated hole sealing glue of pressure break is encapsulated hole.Wherein, the disposable injection hole sealing of cement slurry is primarily present following problems: first is that being difficult to grasp note
The cement mortar amount entered, be easy to cause pressure break pipe end to be blocked with cement, fracturing borehole is caused to scrap, second is that pressure break pipe is transferred
Afterwards, pressure break pipe is close to hole wall, and cement slurry cannot be difficult to ensure entirely around hole wall, sealing of hole intensity when slip casting, third is that cement slurry is logical
It crosses after pressure break pipe returns slurry, after closing slip casting tube valve, cement slurry has certain precipitating in hole, and the decline of cement slurry liquid level is difficult to ensure
Sealing of hole layer position is located at coal seam section；The dedicated hole packer sealing of hole of hydraulic fracturing is primarily present following problems: first is that due to drilling construction mistake
Cheng Zhong, borehole wall is not smooth enough, and the contact area of hole packer limited length and drilling is smaller, using hole wall when hole packer sealing of hole
Imprecision is contacted between sealing of hole capsule, leak is more serious in hydraulic fracturing process, second is that rock in drilling surrounding a certain range
Body is there are crack, and leak is serious in fracturing process, third is that domestic dedicated hydraulic fracturing hole packer sealing of hole pressure is low, Inlet water is forced
It is too high to split dedicated hole packer cost.
Therefore, it is necessary to improve to existing underground coal mine hydraulic fracturing drilling and sealing mode, injection can be not only grasped
The amount of mortar and apart from coal seam position, guarantees that sealing of hole layer is located at coal seam section, avoids pressure break pipe end from being blocked with cement, cause pressure break
Drilling is scrapped, while being close to hole wall after can solving the problem of the decentralization of pressure break pipe sealing of hole intensity is caused to cannot be guaranteed, moreover, may be used also
It is carried out after guarantee fracturing borehole sealing of hole water-tight in hydraulic fracturing process.
Summary of the invention
In view of this, the present invention provides a kind of underground coal mine hydraulic fracturing drilling and sealing devices and methods therefor, can not only slap
It holds the amount of injection mortar and apart from coal seam position, guarantees that sealing of hole layer is located at coal seam section, avoid pressure break pipe end from being blocked with cement, make
It is scrapped at fracturing borehole, while being close to hole wall after can solving the problem of the decentralization of pressure break pipe sealing of hole intensity is caused to cannot be guaranteed, and
And, it is also ensured that it is carried out after fracturing borehole sealing of hole water-tight in hydraulic fracturing process.
Underground coal mine hydraulic fracturing drilling and sealing device of the invention, is located at fracturing borehole bottom hole position including front end
Pressure break pipe, be located at seat earth position for the Grouting Pipe of slip casting into fracturing borehole and front end and for return slurry and it is secondary
The slurry recovering tube of slip casting is provided on the pressure break pipe for guaranteeing that pressure break pipe is located at the righting part in drilling middle position, described to help
Positive part is at least two and is distributed setting along pressure break pipe even circumferential, and each righting part includes external support board and connection external support board
With the supporting block of pressure break pipe.
Further, external support board is arc.
Further, supporting block is axially disposed segmental structure.
Further, pressure break pipe includes pressure break tube body and the screen casing that pressure break tube body front end is arranged in, and the screen casing is long
Degree is seat earth position to fracturing borehole hole bottom distance.
Further, pressure break tube body is in charge of by least two sections of pressure breaks and is constituted, and at least one of which pressure break, which is in charge of, to be provided with
The righting part.
Further, slurry recovering tube front end is floral tube structure.
The invention also discloses a kind of methods using the underground coal mine hydraulic fracturing drilling and sealing device, including with
Lower step:
A, fracturing borehole is formed；
B, pressure break pipe and slurry recovering tube are transferred, pressure break pipe band righting part simultaneously guarantees to be located at fracturing borehole middle position, will return slurry
Pipe front end is located at seat earth position, and pressure break pipe front end is located at fracturing borehole hole bottom；
C, Grouting Pipe is transferred, and blocks fracturing borehole aperture；
D, once grouting is carried out into fracturing borehole by Grouting Pipe, closes Grouting Pipe after slurry recovering tube has cement slurry to return out
Aperture valve, then by slurry recovering tube injected clear water into hole, slurry recovering tube and pressure break iron pipe are cleaned, clear water passes through pressure break iron pipe stream
Out, guarantee that slurry recovering tube aperture valve is opened at this time；
E, it is stood after the completion of once grouting, then inject cement into fracturing borehole hole by slurry recovering tube to carry out secondary injection
Slurry, and slurry recovering tube aperture valve is closed by after after return out cement in pressure break pipe, secondary grouting is completed.
Further, after once grouting is completed 18-28 hours, secondary grouting is carried out.
Further, slurry recovering tube front end is the floral tube structure of 0.4-0.6m；Pressure break pipe front end is screen casing, and screen casing length is
Seat earth position is to fracturing borehole hole bottom distance.
Beneficial effects of the present invention: underground coal mine hydraulic fracturing drilling and sealing devices and methods therefor of the invention, due to pressure
It splits pipe front end and is located at fracturing borehole bottom hole, and slurry recovering tube front end is located at seat earth position, when passing through Grouting Pipe slip casting
Slurry can be returned from slurry recovering tube when to slurry recovering tube front end, and after once grouting, then pass through secondary grouting and guarantee cement slurry liquid level position
In coal seam section, so that slip casting position has certainty, and pressure break pipe end is avoided to be blocked with cement, fracturing borehole is caused to scrap；
And by righting part, the external support board and fracturing borehole wall of righting part keep gap, pressure break pipe are avoided to be close to hole wall, so that
Cement slurry, to improve sealing of hole intensity, can carry out hydraulic fracturing after guaranteeing fracturing borehole sealing of hole entirely around hole wall when slip casting
It is water-tight in journey.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is underground coal mine hydraulic fracturing drilling and sealing apparatus structure use state diagram of the invention；
Fig. 2 is that the pressure break caliber in underground coal mine hydraulic fracturing drilling and sealing device of the invention is illustrated to cross section structure
Figure；
Fig. 3 is the pressure break pipe axial cross section structural representation in underground coal mine hydraulic fracturing drilling and sealing device of the invention
Figure；
Fig. 4 is underground coal mine hydraulic fracturing drilling and sealing method flow chart of steps of the invention.
Specific embodiment
Fig. 1 is underground coal mine hydraulic fracturing drilling and sealing apparatus structure use state diagram of the invention, and Fig. 2 is this hair
For pressure break caliber in bright underground coal mine hydraulic fracturing drilling and sealing device to cross section structure schematic diagram, Fig. 3 is coal of the invention
Pressure break pipe axial cross section structural schematic diagram under mine in hydraulic fracturing drilling and sealing device, Fig. 4 are underground coal mine of the invention
Hydraulic fracturing drilling and sealing method flow chart of steps, as shown in the figure: the underground coal mine hydraulic fracturing drilling and sealing dress of the present embodiment
It sets, is located at the pressure break pipe 2 of 1 bottom hole position of fracturing borehole, for 4 and of Grouting Pipe of the slip casting into fracturing borehole 1 including front end
Front end is located at the slurry recovering tube 5 at the position seat earth 3-1 and for returning slurry and secondary grouting, is provided on the pressure break pipe 2
For guaranteeing that pressure break pipe 2 is located at the righting part 6 in 1 middle position of drilling, the righting part 6 is at least two and along the circle of pressure break pipe 2
It is uniformly distributed setting week, each righting part 6 includes the external support board 6-1 and supporting block 6- for connecting external support board 6-1 and pressure break pipe 2
2；2 center of pressure break pipe to the distance between external support board 6-1 is less than 1 pore radius size of fracturing borehole, the outside external support board 6-1 and pressure
It splits and keeps gap setting between 1 hole wall of drilling, righting part 6 is arranged two, three or four, when for two, radially symmetrically
Setting, when for three, two-by-two between interval 120 ° setting, when for four, at radial symmetric two-by-two setting；As shown in Figure 1, with
For upward hole, pressure break pipe 2 therein is placed among 1 hole of fracturing borehole when in use, after pressure break pipe 2 and the placement of slurry recovering tube 5,
Once grouting (specific steps see below method) is carried out by Grouting Pipe 4, solidification is reached into water to cement in hydraulic fracturing drilling 1
After forcing resistance to spalling requirement, fracturing unit can be connected and pipeline carries out underground coal mine hydraulic fracturing anti-reflection and strengthens gas drainage,
In addition, before slip casting, polyurethane 7 need to be used to block pressure break hole aperture, guarantee during 10 slip casting of cement slurry aperture will not spillage,
After polyurethane reaches some strength, slip casting is carried out into 1 hole of hydraulic fracturing drilling by Grouting Pipe 4.
In the present embodiment, external support board 6-1 is arc；It is adapted with 1 hole inner wall shape of fracturing borehole.
In the present embodiment, supporting block 6-2 is axially disposed segmental structure；With loss of weight effect.
In the present embodiment, pressure break pipe 2 includes 2 ontology of pressure break pipe and the screen casing 8 that 2 ontology front end of pressure break pipe is arranged in, institute
Screen casing length is stated as the position seat earth 3-1 to 1 hole bottom distance of fracturing borehole；Wherein, the position seat earth 3-1 be coal seam 3 most
Coal seam section is not got through in lower layer position, drilling.
In the present embodiment, 2 ontology of pressure break pipe is in charge of by least two sections of pressure breaks to be constituted, and at least one of which pressure break, which is in charge of, to be set
It is equipped with the righting part；Pressure break, which is in charge of in decentralization process, is in charge of piece being in charge of with righting part 6 of intermediate installation every 5-7 root.
In the present embodiment, 5 front end of slurry recovering tube is floral tube structure 9；Floral tube length is 0.4-0.6m, optimal for 0.5m.
The invention also discloses a kind of methods using underground coal mine hydraulic fracturing 1 hole sealing device of drilling, including
Following steps:
A, fracturing borehole 1 is formed；When carrying out underground coal mine hydraulic fracturing, according to related according to design hydraulic fracturing drilling
1；
B, pressure break pipe 2 and slurry recovering tube 5 are transferred, pressure break pipe 2 is with righting part 6 and guarantees to be located at 1 middle position of fracturing borehole, will
5 front end of slurry recovering tube is located at the position seat earth 3-1, and 2 front end of pressure break pipe is located at 1 hole bottom of fracturing borehole；Drilling 1 has been constructed
Cheng Hou, first decentralization pressure break pipe 2 and slurry recovering tube 5, pressure break pipe 2 and slurry recovering tube 5 are fixed together decentralization；
C, Grouting Pipe 4 is transferred, and blocks 1 aperture of fracturing borehole；Pressure break hole aperture is blocked using polyurethane, guarantees cement slurry
Aperture will not spillage during slip casting；
D, once grouting is carried out into fracturing borehole 1 by Grouting Pipe 4, note is closed after slurry recovering tube 5 has cement slurry to return out
4 aperture valve of pipe is starched, then by the injected clear water into hole of slurry recovering tube 5, cleans slurry recovering tube 5 and pressure break iron pipe, clear water passes through pressure break
Iron pipe outflow guarantees that 5 aperture valve of slurry recovering tube is opened at this time；
E, it is stood after the completion of once grouting, then inject cement into 1 hole of fracturing borehole by slurry recovering tube 5 to carry out secondary
Slip casting, and 5 aperture valve of slurry recovering tube is closed by after after return out cement in pressure break pipe 2, secondary grouting is completed.
In the present embodiment, after once grouting is completed 18-28 hours, secondary grouting is carried out；Cement slurry settles, is solidifying in drilling 1
Gu cement slurry liquid level decline in drilling 1, once grouting carry out secondary grouting after completing 24 hours after.
In the present embodiment, 5 front end of slurry recovering tube is the floral tube structure of 0.4-0.6m；2 front end of pressure break pipe is screen casing, screen casing
Length is the position seat earth 3-1 to 1 hole bottom distance of fracturing borehole.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (5)
1. a kind of underground coal mine hydraulic fracturing drilling and sealing device, it is characterised in that: be located at fracturing borehole bottom hole including front end
The pressure break pipe of position is located at seat earth position and for returning slurry for the Grouting Pipe of slip casting into fracturing borehole and front end
With the slurry recovering tube of secondary grouting, it is provided on the pressure break pipe for guaranteeing that pressure break pipe is located at the righting part in drilling middle position,
The righting part is at least two and is distributed setting along pressure break pipe even circumferential, and each righting part includes that external support board and connection are outer
The supporting block of support plate and pressure break pipe；Pressure break tube hub to the distance between external support board is less than fracturing borehole pore radius size, outside
Gap setting is kept between fracturing borehole wall on the outside of support plate；The pressure break pipe includes pressure break tube body and is arranged in pressure break
The screen casing of tube body front end, the screen casing length are seat earth position to fracturing borehole hole bottom distance；The slurry recovering tube is most
Front end is floral tube structure；The lower end of the external support board is bent radially inward；
And hydraulic fracturing drilling and sealing is carried out by above structure with the following method:
A, fracturing borehole is formed；
B, pressure break pipe and slurry recovering tube are transferred, pressure break pipe band righting part simultaneously guarantees to be located at fracturing borehole middle position, before slurry recovering tube
End is located at seat earth position, and pressure break pipe front end is located at fracturing borehole hole bottom；
C, Grouting Pipe is transferred, and blocks fracturing borehole aperture；
D, once grouting is carried out into fracturing borehole by Grouting Pipe, Grouting Pipe aperture is closed after slurry recovering tube has cement slurry to return out
Valve, then by slurry recovering tube injected clear water into hole, clean slurry recovering tube and pressure break iron pipe, clear water are flowed out by pressure break iron pipe, this
When guarantee slurry recovering tube aperture valve open；
E, it is stood after the completion of once grouting, then cement slurry is injected into fracturing borehole hole by slurry recovering tube, carry out secondary grouting,
And slurry recovering tube aperture valve is closed by after after return out cement in pressure break pipe, secondary grouting is completed；
Wherein, in step b, righting part is at least two and is distributed setting along pressure break pipe even circumferential, and each righting part includes outer
The supporting block of support plate and connection external support board and pressure break pipe；Pressure break tube hub to the distance between external support board is less than fracturing borehole
Pore radius size keeps gap setting between external support board outside and fracturing borehole wall；The lower end of the external support board
It is bent radially inward；
After once grouting is completed 18-28 hours, secondary grouting is carried out；
Wherein, the slurry recovering tube front end is the floral tube structure of 0.4-0.6m.
2. underground coal mine hydraulic fracturing drilling and sealing device according to claim 1, it is characterised in that: the external support board
For arc.
3. underground coal mine hydraulic fracturing drilling and sealing device according to claim 2, it is characterised in that: the supporting block is
Axially disposed segmental structure.
4. underground coal mine hydraulic fracturing drilling and sealing device according to claim 3, it is characterised in that: the pressure break pipe sheet
Body is in charge of by least two sections of pressure breaks to be constituted, and at least one of which pressure break, which is in charge of, is provided with the righting part.
5. a kind of method using underground coal mine hydraulic fracturing drilling and sealing device described in claim 1, it is characterised in that: packet
Include following steps:
A, fracturing borehole is formed；
B, pressure break pipe and slurry recovering tube are transferred, pressure break pipe band righting part simultaneously guarantees to be located at fracturing borehole middle position, before slurry recovering tube
End is located at seat earth position, and pressure break pipe front end is located at fracturing borehole hole bottom；
C, Grouting Pipe is transferred, and blocks fracturing borehole aperture；
D, once grouting is carried out into fracturing borehole by Grouting Pipe, Grouting Pipe aperture is closed after slurry recovering tube has cement slurry to return out
Valve, then by slurry recovering tube injected clear water into hole, clean slurry recovering tube and pressure break iron pipe, clear water are flowed out by pressure break iron pipe, this
When guarantee slurry recovering tube aperture valve open；
E, it is stood after the completion of once grouting, then cement slurry is injected into fracturing borehole hole by slurry recovering tube, carry out secondary grouting,
And slurry recovering tube aperture valve is closed by after after return out cement in pressure break pipe, secondary grouting is completed；
Wherein, in step b, righting part is at least two and is distributed setting along pressure break pipe even circumferential, and each righting part includes outer
The supporting block of support plate and connection external support board and pressure break pipe；Pressure break tube hub to the distance between external support board is less than fracturing borehole
Pore radius size keeps gap setting between external support board outside and fracturing borehole wall；The lower end of the external support board
It is bent radially inward；
After once grouting is completed 18-28 hours, secondary grouting is carried out；
The slurry recovering tube front end is the floral tube structure of 0.4-0.6m；Pressure break pipe front end is screen casing, and screen casing length is coal seam bottom
Board position is to fracturing borehole hole bottom distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510648336.3A CN105156067B (en) | 2015-10-09 | 2015-10-09 | Coal mine underground hydraulic fracturing drilling and hole sealing device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510648336.3A CN105156067B (en) | 2015-10-09 | 2015-10-09 | Coal mine underground hydraulic fracturing drilling and hole sealing device and method |
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| CN105156067A CN105156067A (en) | 2015-12-16 |
| CN105156067B true CN105156067B (en) | 2019-03-22 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106285555B (en) * | 2016-09-07 | 2019-01-01 | 淮南矿业(集团)有限责任公司 | The strong coal powder injection layer extraction borehole blowout prevention hole sealing device of high methane and its method for sealing |
| CN106499360A (en) * | 2016-12-27 | 2017-03-15 | 中煤科工集团重庆研究院有限公司 | Coal mine underground hydraulic fracturing drilling and hole sealing device |
| CN107830960B (en) * | 2017-12-06 | 2018-10-30 | 中国地质科学院地质力学研究所 | A kind of hydrofracturing packer device |
| CN110714737B (en) * | 2019-11-09 | 2023-06-20 | 中为(上海)能源技术有限公司 | Well cementation system and method for underground coal gasification process |
| CN112127854A (en) * | 2020-09-22 | 2020-12-25 | 重庆市能源投资集团科技有限责任公司 | Staged fracturing and extraction method for long drill hole of coal seam and pressure-extraction integrated device |
| CN112554781B (en) * | 2020-12-04 | 2022-04-29 | 山东科技大学 | Dredging and re-pumping method for collapse of coal seam gas extraction drill hole |
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| DE4205152A1 (en) * | 1992-02-20 | 1993-08-26 | Risse Gmbh L | Expansible seal for bore-hole - used for sealant injection into fractured rock e.g. in coal mine |
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| CN104775787A (en) * | 2015-02-27 | 2015-07-15 | 河南工程学院 | Hydraulic fracturing crossing hole pitchup hole sealing method of broken surrounding rock |
| CN204960882U (en) * | 2015-10-09 | 2016-01-13 | 中煤科工集团重庆研究院有限公司 | Coal mine underground hydraulic fracturing drilling and hole sealing device |
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| CN2804364Y (en) * | 2005-07-12 | 2006-08-09 | 李凡 | Limiting sucker rod centralizer |
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| US4357992A (en) * | 1981-01-12 | 1982-11-09 | Tigre Tierra, Inc. | Fluid pressurization apparatus and technique |
| DE4205152A1 (en) * | 1992-02-20 | 1993-08-26 | Risse Gmbh L | Expansible seal for bore-hole - used for sealant injection into fractured rock e.g. in coal mine |
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| CN105156067A (en) | 2015-12-16 |
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