CN104879108B - A kind of coal bed gas U-shaped well heat injection enhanced gas extraction method - Google Patents
A kind of coal bed gas U-shaped well heat injection enhanced gas extraction method Download PDFInfo
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Abstract
A kind of coal bed gas U-shaped well heat injection enhanced gas extraction method, is related to a kind of recovery method of subterranean coal gas, solves existing coal bed gas pumping method extraction rate low, it is impossible to effectively carry out the technical problem of coal bed gas extraction.The present invention step be：Peupendicular hole construct to coal seam, construction level well, connection forms U-shaped well；At least construct three U-shaped wells, one well cementation as heat injection well, remaining is used as gas-producing well；Horizontal well is arranged in parallel, and among coal seam；150 DEG C~300 DEG C hyperthermia and superheating water are injected from heat injection well to coal seam, coal seam is heated；Iterative cycles injection hot water by coal seam until heat 100 DEG C~more than 250 DEG C；From producing well extraction coal bed gas and underground water.The present invention is used for the exploitation of subterranean coal gas, with can effectively carry out the extraction of coal bed gas, accelerates coal bed gas extraction speed, improves the advantage of extraction rate.
Description
Technical field
It is particularly a kind of to utilize coal bed gas U-shaped well extraction coal seam the present invention relates to a kind of recovery method of subterranean coal gas
The method of gas.
Background technology
As shown in figure 1, coal bed gas U-shaped well is the connected well constituted using a peupendicular hole 1 with horizontal well 2.Construct first
Peupendicular hole 1 is to coal seam 3, then construction level well 2.Horizontal well 2 includes straight well 2.1 and deflecting horizontal well 2.2, and straight well 2.1 is from ground
When face is crept into the kickoff point (KOP) of deflecting horizontal well 2.2 (starting point for the artificial deflecting that heads straight for beginning by Chui) A, start to bend with certain curvature
To landing point (hole angle reaches 90 ° of point in well track) B of deflecting horizontal well 2.2, then proceed to orient horizontal drilling, make
Deflecting horizontal well 2.2 is connected with peupendicular hole 1.The horizontal segment of horizontal well 2 often has certain gradient, is easy to current direction peupendicular hole
1, and coal seam gas and water is drained into ground by the draining pump installed in peupendicular hole 1.
The coal bed gas pumping method of prior art, for the low coal seam of gas permeability, horizontal well is only just corresponded in coal seam
One horizontal drilling, the scope of exploiting coal bed methane is extremely limited；For the higher coal seam of permeability, if control coal seam gas velocity
Liquid fluctuating when, cause coal petrography block local yielding deformation failure, cause a large amount of discharges of coal dust, both block the pump housing, again may be used
Moment crack in coal seam can be blocked, cause the unexpected reduction of aquifer yield and gas production, influence the yield of coal bed gas, and be difficult to recover
The gas production of coal bed gas well.
The content of the invention
It is an object of the invention to the shortcoming for overcoming prior art, there is provided a kind of coal bed gas U-shaped well heat injection enhanced gas extraction side
Method, solves existing coal bed gas pumping method extraction rate low, it is impossible to effectively 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, its step is：
1. according to the construction requirement and sequence construction of coal bed gas U-shaped well, the peupendicular hole and horizontal well of U-shaped well of constructing, level
The horizontal segment of well is located in coal seam, and peupendicular hole is connected with horizontal well；
2. at least construct three U-shaped wells, the peupendicular hole in one of them U-shaped well uses high temperature resistant cement and steel with horizontal well
Pipe is cemented the well, and as heat injection well, remaining is cemented the well using conventional method, and as gas-producing well, the horizontal segment of heat injection well is arranged in gas-producing well
The centre of horizontal segment；
3. between all horizontal wells be arranged in parallel, and all in coal seam among；
4. after the completion of cementing the well, 150 DEG C~300 DEG C hyperthermia and superheating water are injected from heat injection well to coal seam；
5. hyperthermia and superheating water penetrates into producing well from the horizontal segment of heat injection well by coal seam, and heats coal seam；
6. iterative cycles injection hyperthermia and superheating water, 100 DEG C~more than 250 DEG C are heated to by coal seam；
7. from the peupendicular hole extraction coal bed gas and underground water of producing well, from the straight well extraction coal seam of the horizontal well of producing well
Gas.
Further, when the hot water arrival horizontal segment temperature of the heat injection well is relatively low, the control valve of the heat injection well other end is opened
Door, the relatively low hot water of discharge temperature regulates and controls to the water temperature in heat injection well.
Further, when the heat injection well is with producing well poor connectivity, vapour pressure is carried out using high steam or water before heat injection
Split, until high-temperature water can penetrate into producing well from heat injection well.
Further, the spacing of the heat injection well and producing well is 50 meters~300 meters.
Further, the production requirement of the producing well routinely coal bed gas well, installs the water lift of screw pump or coal bed gas well
Pump, and gas and water separator.
The present invention compared with prior art, with advantages below and beneficial effect：
The technological core of the present invention is that hot water with coal seam during coal seam by carrying out heat friendship to a U-shaped well injection hot water
Change, heat coal seam, the weary hot water of cooling flows out or is forced out from the other end of U-shaped well, and hot water is constantly carried out in U-shaped well follows
Ring.After coal seam is heated, the coal bed gas in coal seam is changed into free state by adsorbed state rapidly, flows into adjacent horizontal well simultaneously
Ground is drained into, the purpose of rapid extraction coal bed gas is reached.
The present invention is used for the exploitation of subterranean coal gas, with can effectively carry out the extraction of coal bed gas, accelerates coal bed gas and takes out
Speed is adopted, the advantage of extraction rate is improved.
Brief description of the drawings
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.
Embodiment
The exemplary embodiments of feature of present invention and advantage are embodied, will in detail be described in the following description with reference to accompanying drawing.Should
What is understood is that the present invention can have various changes in different embodiments, and it does not all depart from protection scope of the present invention,
And explanation therein and diagram are treated as purposes of discussion in itself, and it is not used to the limitation present invention.
As shown in Fig. 2 a kind of coal bed gas U-shaped well heat injection enhanced gas extraction method, step is as follows：
1. according to the construction requirement and sequence construction of coal bed gas U-shaped well, peupendicular hole 1, the horizontal well 2, level of U-shaped well of constructing
The horizontal segment of well 2 is located in coal seam 3, and peupendicular hole 1 is connected with horizontal well 2；
2. at least construct three U-shaped wells, the peupendicular hole 1 in one of them U-shaped well and horizontal well 2 using high temperature resistant cement and
Steel pipe is cemented the well, and as heat injection well H, remaining is cemented the well using conventional method, and as gas-producing well C, heat injection well H horizontal segment is arranged in production
The centre of gas well C horizontal segments；
3. between all horizontal wells 2 be arranged in parallel, and all in coal seam 3 among；
4. after the completion of cementing the well, 150 DEG C~300 DEG C hyperthermia and superheating water are injected from heat injection well H peupendicular hole 1 to coal seam 3, from note
Hot well H horizontal well 2 extracts the waste water for losing heat；
5. hyperthermia and superheating water penetrates into producing well C from heat injection well H horizontal segment by coal seam 3, and heats coal seam 3；
6. iterative cycles injection hot water by coal seam 3 until heat 100 DEG C~more than 250 DEG C；
7. from producing well C the extraction coal bed gas of peupendicular hole 1 and underground water, taken out from the straight well 2.1 of producing well C horizontal well 2
Mining coal seam gas.
When temperature is relatively low after hot water arrival heat injection well H horizontal segment, the control valve G of the heat injection well H other ends, row are opened
Go out the relatively low hot water of temperature, the water temperature in heat injection well is regulated and controled；
As heat injection well H and producing well C poor connectivities, steam pressure break is carried out using high steam or water before heat injection, until
High-temperature water can penetrate into producing well from heat injection well；
Heat injection well H and producing well C spacing is 50 meters~300 meters,
The production requirement of producing well C routinely coal bed gas wells, installs the lift pump of screw pump or coal bed gas well, and air water
Separator.
The U-shaped well of the present invention forms good hot water circulation passage, can constantly carry out hot water circuit, make the water in coal seam
Flat section keeps very high temperature, constantly heats coal seam；After the heating of coal seam, the coal bed gas desorption in adsorbed state, volumetric expansion,
When the permeability in coal seam is relatively low, very high gas pressure can be formed, is flowed beneficial to coal bed gas in coal seam.
The present invention can be embodied without departing from the spiritual or substantive of invention in a variety of forms, it should therefore be appreciated that on
State embodiment and be not limited to foregoing details, and should widely be explained in claim limited range, therefore fall into right
It is required that or the change in its equivalent scope and remodeling all should be claim and covered.
Claims (5)
1. a kind of coal bed gas U-shaped well heat injection enhanced gas extraction method, it is characterised in that：Methods described is concretely comprised the following steps：
1. according to the construction requirement and sequence construction of coal bed gas U-shaped well, peupendicular hole (1), the horizontal well (2), level of U-shaped well of constructing
The horizontal segment of well (2) is located in coal seam (3), and peupendicular hole (1) is connected with horizontal well (2)；
2. at least construct three U-shaped wells, the peupendicular hole (1) in one of them U-shaped well and horizontal well (2) using high temperature resistant cement and
Steel pipe is cemented the well, and as heat injection well (H), remaining is cemented the well using conventional method, as producing well (C), and heat injection well H horizontal segment is arranged
In the centre of producing well (C) horizontal segment；
3. between all horizontal wells (2) be arranged in parallel, and all in coal seam (3) among；
4. after the completion of cementing the well, 150 DEG C~300 DEG C hyperthermia and superheating water are injected from 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) by coal seam (3), and heats coal seam (3)；
6. coal seam (3) are heated to more than 100 DEG C by iterative cycles injection hyperthermia and superheating water；
7. from producing well (C) peupendicular hole (1) extraction coal bed gas and underground water, from the straight well of producing well (C) horizontal well (2)
(2.1) extraction coal bed gas.
2. coal bed gas U-shaped well heat injection enhanced gas extraction method according to claim 1, it is characterised in that：The heat injection well (H)
Hot water reach horizontal segment temperature it is relatively low when, open heat injection well (H) other end control valve (G), the relatively low heat of discharge temperature
Water, regulates and controls to the water temperature in heat injection well.
3. coal bed gas U-shaped well heat injection enhanced gas extraction method according to claim 1, it is characterised in that：The heat injection well (H)
During with producing well (C) poor connectivity, steam pressure break is carried out using high steam before heat injection, until high-temperature water can penetrate into from heat injection well
To producing well.
4. coal bed gas U-shaped well heat injection enhanced gas extraction method according to claim 1, it is characterised in that：The heat injection well (H)
Spacing with producing well (C) is 50 meters~300 meters.
5. coal bed gas U-shaped well heat injection enhanced gas extraction method according to claim 1, it is characterised in that：The producing well (C)
The routinely production requirement of coal bed gas well, installs the lift pump of screw pump or coal bed gas well, and gas and water separator.
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