CN105156067A - 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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- CN105156067A CN105156067A CN201510648336.3A CN201510648336A CN105156067A CN 105156067 A CN105156067 A CN 105156067A CN 201510648336 A CN201510648336 A CN 201510648336A CN 105156067 A CN105156067 A CN 105156067A
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- pressure break
- pipe
- hole
- grouting
- drilling
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- 238000007789 sealing Methods 0.000 title claims abstract description 46
- 239000003245 coal Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005553 drilling Methods 0.000 title claims description 42
- 239000002002 slurry Substances 0.000 claims abstract description 44
- 239000004568 cement Substances 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 238000007569 slipcasting Methods 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 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
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 1
- 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
- 230000007423 decrease Effects 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
- 230000008676 import Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 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
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 238000005728 strengthening 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 fracturing technical field, particularly a kind of underground coal mine fracturing drilling and sealing device and method.
Background technology
Coal-bed gas is a kind of clear energy sources, but is then a kind of disaster source for coal production, and the taking out in advance of gas before how realizing mining, reach the dual purpose of resources development and utilization and colliery mitigation, be the focus that people pay close attention to always.Fracturing is just in order to meet a kind of a kind of new technology integrating region and local gas control that this Production requirement is born.
In prior art, the drilling and sealing technology in hydraulic fracturing technology mainly contains cement paste once grouting sealing of hole and the special hole sealing glue of fracturing is encapsulated hole.Wherein, mainly there is following problem in the disposable injection hole sealing of cement paste: one is be difficult to grasp the cement mortar amount injected, easily cause pressure break pipe end by cement plug, cause pressure break to hole to scrap, two is after pressure break pipe is transferred, hole wall is close to by pressure break pipe, during slip casting, cement paste can not Perfect Ring around hole wall, sealing of hole intensity is difficult to ensure, three is after cement paste returns slurry by pressure break pipe, after closing Grouting Pipe valve, in hole, cement paste has certain precipitation, and cement paste liquid level declines and is difficult to ensure that sealing of hole layer position is positioned at coal seam section; Mainly there is following problem in fracturing special hole packer sealing of hole: one is due in drilling construction process, borehole wall is level and smooth not, the contact area of hole packer limited length and boring is less, during employing hole packer sealing of hole, hole wall contacts imprecision with between sealing of hole capsule, leak in hydraulic fracturing process comparatively serious, two is that around boring, in certain limit, rock mass exists crack, leak in fracturing process serious, three is that domestic special fracturing hole packer sealing of hole pressure is low, and import fracturing special hole packer cost is too high.
Therefore, need to improve existing underground coal mine fracturing drilling and sealing mode, not only can grasp the amount and distance position, coal seam of injecting mortar, ensure that sealing of hole layer is positioned at coal seam section, avoid pressure break pipe end by cement plug, cause pressure break to hole and scrap, can solve after pressure break pipe is transferred simultaneously and be close to hole wall, cause the unwarrantable problem of sealing of hole intensity, and, carry out in hydraulic fracturing process water-tight after also can ensureing pressure break drilling and sealing.
Summary of the invention
In view of this, the invention provides a kind of underground coal mine fracturing drilling and sealing devices and methods therefor, not only can grasp the amount and distance position, coal seam of injecting mortar, ensure that sealing of hole layer is positioned at coal seam section, avoid pressure break pipe end by cement plug, cause pressure break to hole and scrap, can solve after pressure break pipe is transferred simultaneously and be close to hole wall, cause the unwarrantable problem of sealing of hole intensity, and, carry out in hydraulic fracturing process water-tight after also can ensureing pressure break drilling and sealing.
Underground coal mine fracturing drilling and sealing device of the present invention, comprise be positioned at position at the bottom of pressure break drilling hole foremost pressure break pipe, for pressure break boring slip casting Grouting Pipe and be positioned at seat earth position foremost and for returning slurry and the slurry recovering tube of secondary grouting, described pressure break pipe is provided with for ensureing that pressure break pipe is positioned at the righting part in boring centre position, described righting part is at least two and arranges along the distribution of pressure break pipe even circumferential, and each righting part comprises external support board and the back-up block being connected external support board and pressure break pipe.
Further, external support board is arc.
Further, back-up block is the segmental structure arranged vertically.
Further, pressure break pipe comprises pressure break tube body and is arranged on pressure break tube body screen casing foremost, and described screen casing length is distance at the bottom of seat earth position to pressure break drilling hole.
Further, pressure break tube body is in charge of by least two sections of pressure breaks and is formed, and one of them pressure break is in charge of and is provided with described righting part.
Further, slurry recovering tube is floral tube structure foremost.
The invention also discloses a kind of method utilizing described underground coal mine fracturing drilling and sealing device, comprise the following steps:
A, the boring of formation pressure break;
B, transfer pressure break pipe and slurry recovering tube, pressure break pipe racks righting part also ensures to be positioned at pressure break boring centre position, and slurry recovering tube front end is positioned at seat earth position, and pressure break pipe is positioned at pressure break drilling hole bottom foremost;
C, transfer Grouting Pipe, and shutoff pressure break drilling orifice;
D, by Grouting Pipe to pressure break boring in carry out once grouting, Grouting Pipe aperture valve is closed after slurry recovering tube has cement paste to return out, then by slurry recovering tube to injected clear water in hole, cleaning slurry recovering tube and pressure break iron pipe, clear water is flowed out by pressure break iron pipe, now ensures slurry recovering tube aperture valve open;
Leave standstill after e, once grouting complete, then in pressure break drilling hole, inject cement general by slurry recovering tube, carry out secondary grouting, and close slurry recovering tube aperture valve after returning out cement in pressure break pipe and inciting somebody to action, secondary grouting completes.
Further, after once grouting completes 18-28 hour, carry out secondary grouting.
Further, slurry recovering tube is the floral tube structure of 0.4-0.6m foremost; Pressure break pipe is screen casing foremost, and screen casing length is distance at the bottom of seat earth position to pressure break drilling hole.
Beneficial effect of the present invention: underground coal mine fracturing drilling and sealing devices and methods therefor of the present invention, because pressure break pipe is positioned at the bottom of pressure break drilling hole foremost, and slurry recovering tube is positioned at seat earth position foremost, when by Grouting Pipe slip casting to slurry recovering tube foremost time can return slurry from slurry recovering tube, and after once grouting, then ensure that cement paste liquid level is positioned at coal seam section by secondary grouting, make slip casting position have certainty, and avoid pressure break pipe end by cement plug, cause pressure break to hole and scrap; And by righting part, external support board and the pressure break borehole wall of righting part keep gap, avoid pressure break pipe to be close to hole wall, and when making slip casting, cement paste can Perfect Ring around hole wall, thus improve sealing of hole intensity, carry out in hydraulic fracturing process water-tight after ensureing pressure break drilling and sealing.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is underground coal mine fracturing drilling and sealing apparatus structure using state schematic diagram of the present invention;
Fig. 2 is that pressure break caliber in underground coal mine fracturing drilling and sealing device of the present invention is to cross section structure schematic diagram;
Fig. 3 is the axial cross section structure schematic diagram of pressure break pipe in underground coal mine fracturing drilling and sealing device of the present invention;
Fig. 4 is underground coal mine fracturing drilling and sealing method flow chart of steps of the present invention.
Detailed description of the invention
Fig. 1 is underground coal mine fracturing drilling and sealing apparatus structure using state schematic diagram of the present invention, Fig. 2 is that pressure break caliber in underground coal mine fracturing drilling and sealing device of the present invention is to cross section structure schematic diagram, Fig. 3 is the axial cross section structure schematic diagram of pressure break pipe in underground coal mine fracturing drilling and sealing device of the present invention, Fig. 4 is underground coal mine fracturing drilling and sealing method flow chart of steps of the present invention, as shown in the figure: the underground coal mine fracturing drilling and sealing device of the present embodiment, comprise and be positioned at pressure break foremost and hole the pressure break pipe 2 of position at the bottom of 1 hole, for to slip casting in pressure break boring 1 Grouting Pipe 4 and be positioned at seat earth 3-1 position foremost and starch and the slurry recovering tube 5 of secondary grouting for returning, described pressure break pipe 2 is provided with for ensureing that pressure break pipe 2 is positioned at the righting part 6 in boring 1 centre position, described righting part 6 is at least two and arranges along the distribution of pressure break pipe 2 even circumferential, each righting part 6 comprises external support board 6-1 and the back-up block 6-2 being connected external support board 6-1 and pressure break pipe 2, distance between pressure break pipe 2 center to external support board 6-1 is less than pressure break and holes 1 pore radius size, outside external support board 6-1 and pressure break hole between 1 hole wall and keep gap to arrange, righting part 6 arranges two, three or four, when for two, radially be symmetrical arranged, when for three, 120 °, interval setting between two, when for four, radial symmetric is between two become to arrange, as shown in Figure 1, for upward hole, pressure break pipe 2 is wherein holed from pressure break in use, and 1 hole is middle places, after pressure break pipe 2 and slurry recovering tube 5 are placed, once grouting (concrete steps are shown in following method) is carried out by Grouting Pipe 4, after in fracturing boring 1, cement will solidify and reach fracturing requirement of strength, fracturing unit and pipeline can be connected and carry out underground coal mine hydraulic fracturing anti-reflection strengthening gas pumping, in addition, before slip casting, aperture, polyurethane 7 shutoff pressure break hole need be used, to ensure in cement paste 10 slip casting process that aperture can not spillage, after polyurethane reaches some strength, to be holed in 1 hole to fracturing by Grouting Pipe 4 and carry out slip casting.
In the present embodiment, external support board 6-1 is arc; Adapt with pressure break 1 hole inner wall shape of holing.
In the present embodiment, back-up block 6-2 is the segmental structure arranged vertically; There is loss of weight effect.
In the present embodiment, pressure break pipe 2 comprises pressure break pipe 2 body and be arranged on pressure break pipe 2 body screen casing 8 foremost, described screen casing length be seat earth 3-1 position to pressure break hole 1 bottom hole pitch from; Wherein, seat earth 3-1 position is orlop position, coal seam 3, and coal seam section is not got through in boring.
In the present embodiment, pressure break pipe 2 body is in charge of by least two sections of pressure breaks and is formed, and one of them pressure break is in charge of and is provided with described righting part; Pressure break is in charge of in decentralization process to be in charge of every 5-7 root and middle is installed being in charge of with righting part 6.
In the present embodiment, slurry recovering tube 5 is floral tube structure 9 foremost; Floral tube length is 0.4-0.6m, and that optimum is 0.5m.
The invention also discloses and a kind ofly utilize described underground coal mine fracturing to hole the method for 1 hole sealing device, comprise the following steps:
A, formation pressure break boring 1; When namely carrying out underground coal mine fracturing, according to relevant according to design fracturing boring 1;
B, transfer pressure break pipe 2 and slurry recovering tube 5, pressure break pipe 2 is with righting part 6 and is ensured to be positioned at pressure break and to hole 1 centre position, and slurry recovering tube 5 front end is positioned at seat earth 3-1 position, and pressure break pipe 2 is positioned at pressure break foremost and holes 1 bottom, hole; After boring 1 has been constructed, first transfer pressure break pipe 2 and slurry recovering tube 5, pressure break pipe 2 and slurry recovering tube 5 have been fixed together and have transferred;
C, transfer Grouting Pipe 4,1 aperture and shutoff pressure break is holed; Use aperture, polyurethane shutoff pressure break hole, to ensure in cement paste slip casting process that aperture can not spillage;
D, by Grouting Pipe 4 to pressure break boring 1 in carry out once grouting, Grouting Pipe 4 aperture valve is closed after slurry recovering tube 5 has cement paste to return out, pass through slurry recovering tube 5 again to injected clear water in hole, cleaning slurry recovering tube 5 and pressure break iron pipe, clear water is flowed out by pressure break iron pipe, now ensures slurry recovering tube 5 aperture valve open;
Leave standstill after e, once grouting complete, then by slurry recovering tube 5 to pressure break hole to inject in 1 hole cement will, carry out secondary grouting, and until return out in pressure break pipe 2 cement will after close slurry recovering tube 5 aperture valve, secondary grouting completes.
In the present embodiment, after once grouting completes 18-28 hour, carry out secondary grouting; Cement paste sedimentation in boring 1, to solidify in rear boring 1 cement paste liquid level and decline, once grouting completes after 24 hours and carries out secondary grouting.
In the present embodiment, slurry recovering tube 5 is the floral tube structure of 0.4-0.6m foremost; Pressure break pipe 2 is screen casing foremost, screen casing length be seat earth 3-1 position to pressure break hole 1 bottom hole pitch from.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (9)
1. a underground coal mine fracturing drilling and sealing device, it is characterized in that: comprise be positioned at position at the bottom of pressure break drilling hole foremost pressure break pipe, for pressure break boring slip casting Grouting Pipe and be positioned at seat earth position foremost and for returning slurry and the slurry recovering tube of secondary grouting, described pressure break pipe is provided with for ensureing that pressure break pipe is positioned at the righting part in boring centre position, described righting part is at least two and arranges along the distribution of pressure break pipe even circumferential, and each righting part comprises external support board and the back-up block being connected external support board and pressure break pipe.
2. underground coal mine fracturing drilling and sealing device according to claim 1, is characterized in that: described external support board is arc.
3. underground coal mine fracturing drilling and sealing device according to claim 2, is characterized in that: described back-up block is the segmental structure arranged vertically.
4. underground coal mine fracturing drilling and sealing device according to claim 3, it is characterized in that: described pressure break pipe comprises pressure break tube body and is arranged on pressure break tube body screen casing foremost, and described screen casing length is distance at the bottom of seat earth position to pressure break drilling hole.
5. underground coal mine fracturing drilling and sealing device according to claim 4, is characterized in that: described pressure break tube body is in charge of by least two sections of pressure breaks and is formed, and one of them pressure break is in charge of and is provided with described righting part.
6. underground coal mine fracturing drilling and sealing device according to claim 5, is characterized in that: described slurry recovering tube is floral tube structure foremost.
7. utilize a method for the underground coal mine fracturing drilling and sealing device described in claim 1, it is characterized in that: comprise the following steps:
A, the boring of formation pressure break;
B, transfer pressure break pipe and slurry recovering tube, pressure break pipe racks righting part also ensures to be positioned at pressure break boring centre position, and slurry recovering tube front end is positioned at seat earth position, and pressure break pipe is positioned at pressure break drilling hole bottom foremost;
C, transfer Grouting Pipe, and shutoff pressure break drilling orifice;
D, by Grouting Pipe to pressure break boring in carry out once grouting, Grouting Pipe aperture valve is closed after slurry recovering tube has cement paste to return out, then by slurry recovering tube to injected clear water in hole, cleaning slurry recovering tube and pressure break iron pipe, clear water is flowed out by pressure break iron pipe, now ensures slurry recovering tube aperture valve open;
Leave standstill after e, once grouting complete, then in pressure break drilling hole, inject cement general by slurry recovering tube, carry out secondary grouting, and close slurry recovering tube aperture valve after returning out cement in pressure break pipe and inciting somebody to action, secondary grouting completes.
8. method according to claim 7, is characterized in that: after once grouting completes 18-28 hour, carries out secondary grouting.
9. method according to claim 8, is characterized in that: described slurry recovering tube is the floral tube structure of 0.4-0.6m foremost; Pressure break pipe is screen casing foremost, and screen casing length is distance at the bottom of seat earth position to pressure break drilling hole.
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 |
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| Application Number | Priority Date | Filing Date | Title |
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| 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 true CN105156067A (en) | 2015-12-16 |
| CN105156067B CN105156067B (en) | 2019-03-22 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106285555A (en) * | 2016-09-07 | 2017-01-04 | 淮南矿业(集团)有限责任公司 | High methane strong coal powder injection layer extraction borehole blowout prevention hole sealing device and method for sealing thereof |
| 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 |
| CN107830960A (en) * | 2017-12-06 | 2018-03-23 | 中国地质科学院地质力学研究所 | A kind of hydrofracturing packer device |
| CN110714737A (en) * | 2019-11-09 | 2020-01-21 | 中为(上海)能源技术有限公司 | Well cementation system and method for coal underground 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 |
| CN112554781A (en) * | 2020-12-04 | 2021-03-26 | 中煤科工集团重庆研究院有限公司 | Dredging and re-pumping method for collapse of coal seam gas extraction drill hole |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106285555A (en) * | 2016-09-07 | 2017-01-04 | 淮南矿业(集团)有限责任公司 | High methane strong coal powder injection layer extraction borehole blowout prevention hole sealing device and method for sealing thereof |
| 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 |
| CN107830960A (en) * | 2017-12-06 | 2018-03-23 | 中国地质科学院地质力学研究所 | A kind of hydrofracturing packer device |
| CN110714737A (en) * | 2019-11-09 | 2020-01-21 | 中为(上海)能源技术有限公司 | Well cementation system and method for coal underground 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 |
| CN112554781A (en) * | 2020-12-04 | 2021-03-26 | 中煤科工集团重庆研究院有限公司 | Dredging and re-pumping method for collapse of coal seam gas extraction drill hole |
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| CN105156067B (en) | 2019-03-22 |
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