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Method for extracting coal bed gas under wells through alternate cooling and heating function

A technology of alternating cold and heat, coalbed methane, which is applied in the fields of fluid extraction, earthwork drilling, wellbore/well components, etc. The effect of absorptive capacity

Inactive Publication Date: 2018-01-12
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for extracting coal bed gas under wells through alternate cooling and heating function
  • Method for extracting coal bed gas under wells through alternate cooling and heating function
  • Method for extracting coal bed gas under wells through alternate cooling and heating function

Examples

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Effect test

Embodiment 1

[0045] A method for extracting coalbed methane by using the alternate action of cold and heat in underground mines is carried out in the following steps:

[0046] Step 1, create a well pattern in the coal seam

[0047] Drill vertically from the ground and arrange the well pattern, see the well pattern layout diagram figure 1 , figure 1 Among them, (a) is the top view of the well pattern layout, (b) is the cross-sectional view along the A-A line in the figure (a), the drilling interval is 300m, the drilling depth is as far as the coal seam 6, and the number of wellheads is 5, among which, the vertical drilling After entering the coal seam 6, lower the screen casing 4 in the 6th section of the coal seam, and lower the thermal insulation casing 3 in the 5th section of the overlying rock layer on the roof of the coal seam above the coal seam 6, and perform corresponding cementing according to the specifications;

[0048] After cementing, in the well pattern of 5 wells arranged, ...

Embodiment 2

[0060] A method for extracting coalbed methane by using the alternate action of cold and heat in underground mines is carried out in the following steps:

[0061] Step 1, create a well pattern in the coal seam

[0062] Drill vertically from the ground and arrange the well pattern, see the well pattern layout diagram Figure 4 , Figure 4 Among them, (c) is the top view of the well pattern layout, (d) is the cross-sectional view along the B-B line in the figure (c), the drilling interval is 500m, the drilling depth is as far as the coal seam 6, and the number of wellheads is 14. Among them, the vertical drilling After entering the coal seam 6, lower the screen casing 4 in the 6th section of the coal seam, and lower the thermal insulation casing 3 in the 5th section of the overlying rock layer on the roof of the coal seam above the coal seam 6, and perform corresponding cementing according to the specifications;

[0063] After cementing, in the well pattern of 14 wells arrange...

Embodiment 3

[0074] A method for extracting coalbed methane by using the alternate action of cold and heat in underground mines is carried out in the following steps:

[0075] Step 1, create a well pattern in the coal seam

[0076] Vertical drilling is carried out from the ground, the well pattern is arranged, the drilling interval is 100m, the well depth of the drilling reaches to coal seam 6, and the number of wellheads is 3. Among them, after the vertical drilling enters coal seam 6, the screen pipe casing 4 is lowered in the coal seam 6, and the coal seam 6 The thermal insulation casing 3 is lowered in the 5th section of the overlying strata on the roof of the coal seam above, and the corresponding cementing is carried out according to the specification requirements;

[0077] After cementing, in the well pattern of the 3 wells arranged, one of the wells is selected as the working well 1, whose function is to implement alternating cooling and heating; the other wells are used as gas pro...

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Abstract

The invention discloses a method for extracting coal bed gas under wells through the alternate cooling and heating function, and belongs to the technical field of unconventional oil and gas production. The method comprises the steps that (1) vertical well drilling is carried out from the ground, a well pattern is arranged, the wells are drilled till a coal layer, the number of the wells is largerthan or equal to 2, at least on well in the arranged well pattern is a work well, and the other wells are adopted as gas extraction and production wells; (2), a heat source is input into the coal layers from the work well, the temperature of the heat source is adjusted to range from 380 DEG C to 450 DEG C, the coal layer is heated, and when the temperature of the coal layer is larger than or equalto 350 DEG C, heating is stopped; (3), liquid nitrogen is injected into the coal layer through the work well, the injection amount of the liquid nitrogen is determined according to different geological conditions and coal body features, and after the liquid nitrogen is vaporized, refrigeration is finished; and (4), the step 2 and the step 3 are repeated many times, the coal layer is located in analternate work state all the time, and coal layer gas is extracted in the gas extraction and production wells. According to the method, coal layer gas extraction can be effectively carried out, and the coal layer gas extraction speed and the extraction rate are increased.

Description

technical field [0001] The invention relates to the technical field of unconventional oil and gas exploitation, in particular to a method for extracting coalbed methane by using alternating cold and heat in underground mines. Background technique [0002] Coal bed methane is a kind of associated gas of coal, the main component is methane. In coal mines, coal bed methane is commonly called "gas". Coal bed methane is a combustible gas, which is not only a precious resource, but also the biggest hidden danger that threatens the safe production of coal mines. During the mining process, gas diffuses from the coal seam and gushes out into the tunnel of the mine. When the gas concentration in the tunnel reaches the explosion limit and encounters an open flame, a coal mine gas explosion accident will occur. Therefore, it is exploited and utilized as a clean energy, which can not only realize the development and utilization of new energy, but also effectively prevent mine disasters ...

Claims

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Application Information

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IPC IPC(8): E21B43/00E21B43/24E21B43/26
Inventor 马玉林程瑶马凯张永利
Owner LIAONING TECHNICAL UNIVERSITY
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