CN105019935A - Overground/underground combined pressure relief outburst elimination coal seam rapid channel digging method - Google Patents
Overground/underground combined pressure relief outburst elimination coal seam rapid channel digging method Download PDFInfo
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- CN105019935A CN105019935A CN201410151121.6A CN201410151121A CN105019935A CN 105019935 A CN105019935 A CN 105019935A CN 201410151121 A CN201410151121 A CN 201410151121A CN 105019935 A CN105019935 A CN 105019935A
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Abstract
The invention discloses an overground/underground combined pressure relief outburst elimination coal seam rapid channel digging method comprising the following steps: drilling a vertical shaft (3) on a ground (2) portion of a target coal seam (1), and using a high pressure hydraulic fracturing pump to reconstruct the target coal seam (1); arranging a ground gas extraction apparatus on the ground vertical shaft (3), and carrying out gas extraction process for the target coal seam (1); reasonably drilling holes and extraction holes (5) on a target coal seam (1) digging channel work plane (4), and arranging an underground gas extraction apparatus to carry out secondary gas extraction process for the target coal seam (1) until coal seam gas content and pressure to be under a safety exploitation standard; carrying out rapid channel digging for the pressure relief outburst elimination coal seam. The invention provides a novel method for rapidly digging channel in the low permeability high outburst coal seam.
Description
Technical field
The present invention relates to hypotonic, high prominent coal-bed gas release extinction and field, lane is dug in coal seam fast, be particularly suitable for coal seam geostatic stress and respectively dig lane fast to the coal seam of the basic same sex.
Background technology
Coal bed gas (gas) is the mineral resources of coal, mainly composes with ADSORPTION STATE form and is stored in coal seam.Along with China's part pit mining degree of depth constantly increases, gas bearing capacity increases, and gas stores pressure increase, and due to reasons such as China's coalbed methane reservoir poor air permeability, the tax gas be stored in coal seam is dug the work such as lane and exploitation fast to coal seam and is brought huge potential safety hazard, increased risk.Therefore, first release extinction must be carried out to it in the pick lane in high methane content coal seam.
At present, China digs fast in the process of lane in coal seam and mainly contains two kinds for the method for gas release extinction.One method is, in the process of pick lane, down-hole, rational cloth hole is carried out to getting working face and drills, pressure break pipeline is installed in lateral aperture, shutoff is carried out between pressure break conduit entrance place and working face of coal seam, utilizing fracturing to treat mining coal seam and carry out pressure break, treating mining coal seam gas bearing capacity and pressure to reducing.But because in hydraulic fracturing process, hydraulic pressure reaches more than 30MPa, induction outstanding accident easily occurs between pressure break conduit entrance place and working face of coal seam, and the method does not reach extinction object, and danger coefficient is higher.Another kind method beats straight well to carry out fracturing from ground to coal seam rational position, takes aboveground extraction technology to treat mining coal seam release extinction.Because mining depth increases, the method is long to the coal bed gas extraction cycle, and there is blind area.
Summary of the invention
The object of the present invention is to provide a kind of underground associating release extinction coal seam to dig lane method fast, the method adopting ground straight well fracturing and down-hole brill horizontal drainage holes release extinction to combine, solves Problems existing in existing two kinds of technology.
For overcoming the above problems, the present invention is realized by following technique measures (step):
(1) by target coal seam characteristic distributions, determine coal seam digging laneway, according to fracturing influence area and coal seam stress direction, carry out well spacing design on ground;
(2) at well spacing position, ground drilling straight-hole to target coal seam, more than roof take cased hole completion, below roof, take composite material completion;
(3) utilize on ground high-pressure hydraulic fracturing pump to inject water under high pressure to ground straight well successively, fracturing is carried out to target coal seam, carries out coal bed texture and reproduce, increase coal seam flow conductivity;
(4) utilize ground gas drainage device, by ground straight well, gas pumping is carried out to target coal seam, until cannot till mining;
(5) on target coal seam digging laneway work plane, rational arrangement bores bores horizontal drainage holes, forms horizontal drainage holes influence area, and horizontal drainage holes influence area and fracturing influence area are linked up, and forms gas migration passage, increases gas permeability of coal seam;
(6) underground gas extraction device is set in the digging laneway of coal seam and by horizontal drainage holes, secondary gas pumping is carried out to target coal seam, until target coal seam gas bearing capacity and pressure arrive safe working below the mark till;
(7) after the process of twice pair of target coal seam gas pumping, reach coal seam pressure relief extinction object, conventional coal seam can be adopted to dig lane technology fast pick lane is carried out to target coal seam;
(8) according to the influence area scope of horizontal drainage holes, determine target coal seam driving distance, repeat (5) ~ (7), until whole heading headwork completes.
The quantity of described ground straight well and distribution situation, should determine jointly according to geological conditions, target coal seam characteristic distributions, coal seam stress direction and fracturing sphere of action, and fracturing scope must cover whole coal seam digging laneway; Described down-hole horizontal drainage holes quantity and distribution situation, should determine jointly according to underworkings working face of coal seam size, coal seam characteristic distributions and ground straight well fracturing sphere of action; Described down-hole horizontal drainage holes creeps into distance forward, should determine according to underground gas extraction device extraction capacity of water.
Beneficial effect of the present invention is as follows:
Lane method is dug in a kind of underground associating release extinction coal seam of the present invention fast, multiple ground straight well is utilized to carry out fracturing to target coal seam, regular pressure break band is formed in target coal seam, utilize ground gas extraction technology to carry out gas pumping in advance to target coal seam, reduce coal seam gas-bearing capacity and pressure; In underworkings, cloth hole drill lateral aperture is carried out to target coal seam work plane simultaneously, extraction technology in down-hole is utilized to carry out gas pumping again to target coal seam, finally reach coal seam gas-bearing capacity safety standard once, underground associating release outburst elimination method can make discharge channel increase greatly, coal seam pressure relief space increases, gas permeability of coal seam strengthens, create favorable conditions to the release of inside, coal seam, gas release and flowing, coal seam gas-bearing capacity is reached and can adopt standard, reduce potential safety hazard, realize coal seam and dig lane fast.
Accompanying drawing explanation
Fig. 1 is that lane overall structure schematic diagram is dug in underground associating release extinction coal seam of the present invention fast;
Fig. 2 is straight well fracturing influence area, ground of the present invention schematic diagram;
Fig. 3 is down-hole horizontal drainage holes distribution schematic diagram of the present invention;
Be labeled as in figure: 1: target coal seam; 2: ground; 3: ground straight well; 4: roof; 5: horizontal drainage holes; 6: digging laneway work plane; 7: seat earth; 8: fracturing influence area.
Detailed description of the invention
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
Lane method is dug in described a kind of underground associating release extinction coal seam fast, and as shown in Figure 1, Figure 2 and Figure 3, concrete implementation step is as follows:
Step 1: by target coal seam 1 characteristic distributions, determine coal seam digging laneway, according to fracturing influence area 8 and coal seam stress direction, carries out well spacing design on ground 2;
Step 2: at well spacing position, ground 2 drilling straight-hole 3 to seat earth 7, roof more than 4 takes cased hole completion, and roof less than 4 takes composite material completion;
Step 3: utilize high-pressure hydraulic fracturing pump to inject water under high pressure to ground straight well 3 successively on ground, carries out fracturing to target coal seam 1, coal bed texture is reproduced, and increases coal seam flow conductivity;
Step 4: utilize ground gas drainage device, carries out gas pumping by ground straight well 3 pairs of target coal seam 1, until cannot till mining;
Step 5: rational arrangement bores bores horizontal drainage holes 5 on target coal seam 1 digging laneway work plane 6, form horizontal drainage holes 5 influence area, horizontal drainage holes 5 influence area and fracturing influence area 8 are linked up, and form gas migration passage, increase gas permeability of coal seam;
Step 6: underground gas extraction device is set in the digging laneway of coal seam and carries out secondary gas pumping by horizontal drainage holes 5 pairs of target coal seam 1, until target coal seam 1 gas bearing capacity and pressure arrive safe working below the mark till;
Step 7: after the process of twice pair of target coal seam 1 gas pumping, reach coal seam pressure relief extinction object, can adopt conventional coal seam to dig lane technology fast and carry out pick lane to target coal seam 1;
Step 8: according to the influence area scope of horizontal drainage holes, determine tunnelling distance, repeats step 5 ~ 7, until whole heading headwork completes.
Claims (5)
1. a lane method is dug in underground associating release extinction coal seam fast, comprises following step, it is characterized in that:
Step 1: by target coal seam (1) characteristic distributions, determine coal seam digging laneway, according to fracturing influence area (8) and coal seam stress direction, carries out well spacing design in ground (2);
Step 2: in ground (2) well spacing position drilling straight-hole (3) to seat earth (7), roof takes cased hole completion more than (4), and roof takes composite material completion below (4);
Step 3: utilize on ground high-pressure hydraulic fracturing pump to inject water under high pressure to ground straight well (3) successively, fracturing is carried out to target coal seam (1), coal bed texture is reproduced, increase coal seam flow conductivity;
Step 4: utilize ground gas drainage device, carries out gas pumping by ground straight well (3) to target coal seam (1), until cannot till mining;
Step 5: bore horizontal drainage holes (5) at the upper rational arrangement bores of target coal seam (1) digging laneway work plane (6), form horizontal drainage holes (5) influence area, horizontal drainage holes (5) influence area and fracturing influence area (8) are linked up, and form gas migration passage, increase gas permeability of coal seam;
Step 6: underground gas extraction device is set in the digging laneway of coal seam and by horizontal drainage holes (5), secondary gas pumping is carried out to target coal seam (1), until target coal seam (1) gas bearing capacity and pressure arrive safe working below the mark till;
Step 7: after the gas pumping process of twice pair of target coal seam (1), reach coal seam pressure relief extinction object, can adopt conventional coal seam to dig lane technology fast and carry out pick lane to target coal seam (1);
Step 8: according to the influence area scope of horizontal drainage holes, determine tunnelling distance, repeats step 5 ~ 7, until whole heading headwork completes.
2. lane method is dug in a kind of underground associating release extinction coal seam as claimed in claim 1 fast, it is characterized in that: the quantity of ground straight well and distribution situation, jointly should determine according to geological conditions, target coal seam characteristic distributions, coal seam stress direction and fracturing sphere of action, fracturing scope must cover whole coal seam digging laneway.
3. lane method is dug in a kind of underground associating release extinction coal seam as claimed in claim 1 or 2 fast, it is characterized in that: down-hole horizontal drainage holes quantity and distribution situation, jointly should determine according to underworkings working face of coal seam size, coal seam characteristic distributions and ground straight well fracturing sphere of action.
4. lane method is dug in a kind of underground associating release extinction coal seam as described in claim 1,2 or 3 fast, it is characterized in that: down-hole horizontal drainage holes creeps into distance forward, is determined by underground gas extraction device extraction capacity of water.
5. lane method is dug in a kind of underground associating release extinction coal seam as described in claim 1,2,3 or 4 fast, it is characterized in that: lane distance is dug in coal seam fast, should creep into forward gas bearing capacity and pressure in Distance geometry coal seam determine according to horizontal drainage holes.
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| CN201410151121.6A CN105019935A (en) | 2014-04-16 | 2014-04-16 | Overground/underground combined pressure relief outburst elimination coal seam rapid channel digging method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107905832A (en) * | 2017-11-06 | 2018-04-13 | 北京九尊能源技术股份有限公司 | The outburst elimination method of pump drainage is combined on a kind of nitrogen pressure break and ground with underground |
| CN111005723A (en) * | 2018-12-12 | 2020-04-14 | 天地科技股份有限公司 | Ground large-range rock stratum pre-splitting area anti-impact method based on up-down combined arrangement |
| CN111894595A (en) * | 2020-08-11 | 2020-11-06 | 昆明理工大学 | Pressure relief prevention and control method for surrounding rock burst of side wall of vertical shaft |
| CN114233369A (en) * | 2021-12-28 | 2022-03-25 | 山西晋煤集团技术研究院有限责任公司 | Method for accurately eliminating coal and gas outburst by combining up and down of well |
| US11299954B2 (en) * | 2018-05-31 | 2022-04-12 | China University Of Mining And Technology | Fracturing relief method for stress concentration of remaining ore pillars in overlying goaf |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107905832A (en) * | 2017-11-06 | 2018-04-13 | 北京九尊能源技术股份有限公司 | The outburst elimination method of pump drainage is combined on a kind of nitrogen pressure break and ground with underground |
| US11299954B2 (en) * | 2018-05-31 | 2022-04-12 | China University Of Mining And Technology | Fracturing relief method for stress concentration of remaining ore pillars in overlying goaf |
| CN111005723A (en) * | 2018-12-12 | 2020-04-14 | 天地科技股份有限公司 | Ground large-range rock stratum pre-splitting area anti-impact method based on up-down combined arrangement |
| CN111894595A (en) * | 2020-08-11 | 2020-11-06 | 昆明理工大学 | Pressure relief prevention and control method for surrounding rock burst of side wall of vertical shaft |
| CN111894595B (en) * | 2020-08-11 | 2021-07-16 | 昆明理工大学 | Pressure relief prevention and control method for surrounding rock burst of side wall of vertical shaft |
| CN114233369A (en) * | 2021-12-28 | 2022-03-25 | 山西晋煤集团技术研究院有限责任公司 | Method for accurately eliminating coal and gas outburst by combining up and down of well |
| CN114233369B (en) * | 2021-12-28 | 2023-10-31 | 山西晋煤集团技术研究院有限责任公司 | Method for precisely eliminating coal and gas outburst by up-and-down combination |
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