CN104879108A - Heat-injection enhanced extracting and mining method of coal bed gas U-type well - Google Patents
Heat-injection enhanced extracting and mining method of coal bed gas U-type well Download PDFInfo
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Abstract
The invention discloses a heat-injection enhanced extracting and mining method of a coal bed gas U-type well, and refers to a mining method of underground coal bed gas. The heat-injection enhanced extracting and mining method solves the technical problem that the extracting rate of the existing coal bed gas extracting method is low, and the coal bed gas cannot be effectively extracted and mined. The heat-injection enhanced extracting and mining method comprises the following steps: constructing a vertical well until a coal bed, constructing a horizontal well, and interconnecting them to form a U-shaped well; at least constructing three U-shaped wells, wherein a cementing well is used as the heat injection well, and the remaining is used as a gas producing well; arrange the horizontal well in parallel and place it in the coal bed; injecting high-temperature overheat water at 150-300 DEG C from the heat injection well to the coal bed, and heating the coal bed; repeatedly and circularly injecting hot water until heating the coal bed to 100-250 DEG C above; mining the coal bed gas and underground water from the production well. The heat-injection enhanced extracting and mining method is used for mining the underground coal bed, and can effectively mine the coal bed gas, speed up the mining speed of the coal bed gas and improve the mining rate.
Description
Technical field
The present invention relates to a kind of exploitation method of subterranean coal gas, particularly a kind of method utilizing coal bed gas U-shaped well extraction coal bed gas.
Background technology
As shown in Figure 1, the U-shaped well of coal bed gas is the connected well utilizing a peupendicular hole 1 and horizontal well 2 to form.First construction peupendicular hole 1 to coal seam 3, then construction level well 2.Horizontal well 2 comprises straight well 2.1 and deflecting horizontal well 2.2, during the kickoff point (KOP) of straight well 2.1 from earth drilling to deflecting horizontal well 2.2 (being headed straight for the starting point of the artificial deflecting that begins by Chui) A, start landing point (in well track, hole angle reaches the point of the 90 °) B being bent to deflecting horizontal well 2.2 with certain curvature, then continue directed horizontal drilling, deflecting horizontal well 2.2 is communicated with peupendicular hole 1.The horizontal segment of horizontal well 2 often has certain gradient, is convenient to current direction peupendicular hole 1, and by the drainage pump installed in peupendicular hole 1, coal bed gas, water is drained into ground.
The coal bed gas pumping method of prior art, for the coal seam that gas permeability is low, horizontal well is only equivalent to a horizontal drilling in coal seam, and the scope of exploiting coal bed methane is extremely limited; For the coal seam that permeability is higher, if when controlling the liquid fluctuating of coal bed gas flow velocity, cause coal petrography block local yielding deformation failure, cause a large amount of discharges of coal dust, both block the pump housing, crack in coal seam may be blocked instantaneously again, cause the unexpected reduction of aquifer yield and gas production, affect the output of coal bed gas, and be difficult to the gas production recovering coal bed gas well.
Summary of the invention
The object of the invention is to the shortcoming overcoming prior art, a kind of coal bed gas U-shaped well heat injection enhanced gas extraction method is provided, solves existing coal bed gas pumping method extraction rate low, effectively can not carry out the technical problem of coal bed gas extraction.
The present invention is achieved through the following technical solutions:
A kind of coal bed gas U-shaped well heat injection enhanced gas extraction method, the steps include:
1. according to construction requirement and the sequence construction of the U-shaped well of coal bed gas, the peupendicular hole of U-shaped well of constructing and horizontal well, the horizontal segment of horizontal well is arranged in coal seam, and peupendicular hole is communicated with horizontal well;
2. at least construct three U-shaped wells, the peupendicular hole in one of them U-shaped well and horizontal well adopt high temperature resistant cement and steel pipe to cement the well, as heat injection well, all the other employing conventional methods cement the well, as gas-producing well, the horizontal segment of heat injection well is arranged in the centre of gas-producing well horizontal segment;
3. be arranged in parallel between all horizontal wells, and be all among coal seam;
4., after having cemented the well, 150 DEG C ~ 300 DEG C hyperthermia and superheating water are injected by heat injection well to coal seam;
5. hyperthermia and superheating water penetrates into producing well from the horizontal segment of heat injection well through coal seam, and heats coal seam;
6. iterative cycles injects hyperthermia and superheating water, coal seam is heated to 100 DEG C ~ more than 250 DEG C;
7. from peupendicular hole extraction coal bed gas and the underground water of producing well, from the straight well extraction coal bed gas of the horizontal well of producing well.
Further, when the hot water arrival horizontal segment temperature of described heat injection well is lower, opens the by-pass valve control of the heat injection well other end, the hot water that discharge temperature is lower, the water temperature in heat injection well is regulated and controled.
Further, when described heat injection well and producing well poor connectivity, high steam or water before heat injection, is adopted to carry out steam pressure break, until high temperature water can penetrate into producing well from heat injection well.
Further, the spacing of described heat injection well and producing well is 50 meters ~ 300 meters.
Further, the production requirement of described producing well coal bed gas well routinely, installs the lift pump of screw pump or coal bed gas well, and gas and water separator.
The present invention compared with prior art, has the following advantages and beneficial effect:
Technological core of the present invention injects hot water to a U-shaped well, and hot water carries out exchange heat by during coal seam and coal seam, heating coal seam, and the weary hot water of cooling flows out from the other end of U-shaped well or is forced out, and constantly in U-shaped well, carries out hot water circuit.After coal seam is heated, the coal bed gas in coal seam changes free state into by adsorbed state rapidly, flows into adjacent horizontal well and drains into ground, reaches the object of rapid extraction coal bed gas.
The present invention is used for the exploitation of subterranean coal gas, has the extraction effectively can carrying out coal bed gas, accelerates coal bed gas extraction speed, improves the advantage of extraction rate.
Accompanying drawing explanation
Fig. 1 is the coal bed gas pumping method schematic diagram of prior art;
Fig. 2 is by the coal bed methane exploring method schematic diagram (system layout) of 3 U-shaped well constructions.
Detailed description of the invention
Embody the exemplary embodiments of feature & benefits of the present invention, will describe in detail in the following description by reference to the accompanying drawings.Be understood that the present invention can have various changes in different embodiments, it neither departs from protection scope of the present invention, and explanation wherein and to be shown in be use when explain in essence, and be not used to limit the present invention.
As shown in Figure 2, a kind of coal bed gas U-shaped well heat injection enhanced gas extraction method, step is as follows:
1. according to construction requirement and the sequence construction of the U-shaped well of coal bed gas, the peupendicular hole 1 of U-shaped well of constructing, horizontal well 2, the horizontal segment of horizontal well 2 is arranged in coal seam 3, and peupendicular hole 1 is communicated with horizontal well 2;
2. at least construct three U-shaped wells, peupendicular hole 1 in one of them U-shaped well adopts high temperature resistant cement and steel pipe to cement the well with horizontal well 2, and as heat injection well H, all the other adopt conventional method well cementation, as gas-producing well C, the horizontal segment of heat injection well H is arranged in the centre of gas-producing well C horizontal segment;
3. be arranged in parallel between all horizontal wells 2, and be all among coal seam 3;
4. after having cemented the well, inject 150 DEG C ~ 300 DEG C hyperthermia and superheating water by the peupendicular hole 1 of heat injection well H to coal seam 3, extract from the horizontal well 2 of heat injection well H the waste water losing heat;
5. hyperthermia and superheating water penetrates into producing well C from the horizontal segment of heat injection well H through coal seam 3, and heats coal seam 3;
6. iterative cycles injects hot water until coal seam 3 is heated 100 DEG C ~ more than 250 DEG C;
7. from peupendicular hole 1 extraction coal bed gas and the underground water of producing well C, from the straight well 2.1 extraction coal bed gas of the horizontal well 2 of producing well C.
When temperature is lower after the horizontal segment of hot water arrival heat injection well H, opens the by-pass valve control G of the heat injection well H other end, the hot water that discharge temperature is lower, the water temperature in heat injection well is regulated and controled;
As heat injection well H and producing well C poor connectivity, high steam or water before heat injection, is adopted to carry out steam pressure break, until high temperature water can penetrate into producing well from heat injection well;
The spacing of heat injection well H and producing well C is 50 meters ~ 300 meters,
The production requirement of producing well C coal bed gas well routinely, installs the lift pump of screw pump or coal bed gas well, and gas and water separator.
U-shaped well of the present invention forms good hot water circulation passage, constantly can carry out hot water circuit, and the temperature making the horizontal segment in coal seam keep very high, constantly heats coal seam; After the heating of coal seam, be in the coal bed gas desorb of adsorbed state, volume expansion, when the permeability in coal seam is lower, very high gas pressure can be formed, be beneficial to coal bed gas and flow in coal seam.
The present invention specifically can implement in a variety of forms and not depart from spirit or the essence of invention, so be to be understood that, above-described embodiment is not limited to aforesaid details, and should explain widely in claim limited range, therefore fall into change in claim or its equivalent scope and remodeling and all should be claim and contained.
Claims (5)
1. a coal bed gas U-shaped well heat injection enhanced gas extraction method, is characterized in that: the concrete steps of described method are:
1. according to construction requirement and the sequence construction of the U-shaped well of coal bed gas, to construct peupendicular hole (1), the horizontal well (2) of U-shaped well, the horizontal segment of horizontal well (2) is arranged in coal seam (3), and peupendicular hole (1) is communicated with horizontal well (2);
2. at least construct three U-shaped wells, peupendicular hole (1) in one of them U-shaped well and horizontal well (2) adopt high temperature resistant cement and steel pipe to cement the well, as heat injection well (H), all the other adopt conventional method well cementation, as gas-producing well (C), the horizontal segment of heat injection well H is arranged in the centre of gas-producing well (C) horizontal segment;
3. be arranged in parallel between all horizontal wells (2), and be all among coal seam (3);
4., after having cemented the well, 150 DEG C ~ 300 DEG C hyperthermia and superheating water are injected by heat injection well (H) to coal seam (3);
5. hyperthermia and superheating water penetrates into producing well (C) from the horizontal segment of heat injection well (H) through coal seam (3), and heats coal seam (3);
6. coal seam (3) are heated to 100 DEG C ~ more than 250 DEG C by iterative cycles injection hyperthermia and superheating water;
7. from peupendicular hole (1) extraction coal bed gas and the underground water of producing well (C), from straight well (2.1) the extraction coal bed gas of the horizontal well (2) of producing well (C).
2. coal bed gas according to claim 1 U-shaped well heat injection enhanced gas extraction method, it is characterized in that: when the hot water arrival horizontal segment temperature of described heat injection well (H) is lower, open the by-pass valve control (G) of heat injection well (H) other end, the hot water that discharge temperature is lower, regulates and controls the water temperature in heat injection well.
3. coal bed gas according to claim 1 U-shaped well heat injection enhanced gas extraction method, it is characterized in that: when described heat injection well (H) and producing well (C) poor connectivity, high steam or water is adopted to carry out steam pressure break, until high temperature water can penetrate into producing well from heat injection well before heat injection.
4. coal bed gas according to claim 1 U-shaped well heat injection enhanced gas extraction method, is characterized in that: described heat injection well (H) is 50 meters ~ 300 meters with the spacing of producing well (C).
5. coal bed gas according to claim 1 U-shaped well heat injection enhanced gas extraction method, is characterized in that: the production requirement of described producing well (C) coal bed gas well routinely, installs the lift pump of screw pump or coal bed gas well, and gas and water separator.
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| CN105422067A (en) * | 2015-12-29 | 2016-03-23 | 中国石油大学(华东) | Method for exploiting coalbed methane by adopting active water displacement |
| CN107514250A (en) * | 2016-06-15 | 2017-12-26 | 中国石油化工股份有限公司 | A kind of method for SAGD |
| CN107542440A (en) * | 2017-10-23 | 2018-01-05 | 大庆东油睿佳石油科技有限公司 | A kind of method of U-shaped well microwave heating exploitation of gas hydrate |
| CN107558984A (en) * | 2017-07-27 | 2018-01-09 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of Mining Area Coal Seam gas well batch production development approach |
| CN109403924A (en) * | 2018-09-29 | 2019-03-01 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of single coal bed gas well injection hot water driving gang of wells method for increasing |
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| CN110541695A (en) * | 2019-09-05 | 2019-12-06 | 西安科技大学 | Efficient oil extraction method for in-situ pyrolysis of oil-rich coal by superheated steam |
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