Aboveground and underground combined heat injection coal bed gas extraction method

A coalbed methane and coalbed technology, applied in the field of coalbed methane extraction, can solve problems such as difficult industrial production application and difficult separation technology, and achieve the effects of increasing pressure, accelerating desorption, and increasing permeability

Active Publication Date: 2009-08-12
赵阳升
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, due to the immaturity of rapid and efficient gas separation technology, especially the difficulty of separation tech

Method used

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  • Aboveground and underground combined heat injection coal bed gas extraction method
  • Aboveground and underground combined heat injection coal bed gas extraction method
  • Aboveground and underground combined heat injection coal bed gas extraction method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Such as figure 1 , 2 Shown, a kind of method for coalbed methane in a single coal seam combined with upper and lower heat injection and drainage, in a single coal seam with a thickness of 10m and a burial depth of 100m, two vertical heat injection wells 1 are arranged by the present invention, and the well spacing 600m, perpendicular to the underground roadway 3, each well is drilled into the coal seam 6, the double-layer annular pipe 8 is set under the roof rock section 5, and the flower pipe 14 is set under the coal seam section 6, along the outer layer of the double-layer annular pipe 8. High temperature resistant cement 9 cementing. Two extraction roadways 2 are constructed so that they are parallel to the connection line of the two heat injection wells 1 and perpendicular to the main road 3, and the drainage roadway 2 is sealed at the entrance of the main road. According to the conventional method, install the pumping station, the drainage system and the monitori...

Embodiment 2

[0039] Such as image 3 , 4 Shown, a kind of method for coalbed methane in a single coal seam combined with upper and lower heat injection and drainage, in a single coal seam with a thickness of 10m and a burial depth of 100m, two vertical heat injection wells 1 are arranged by the present invention, and the well spacing 600m, the connecting line of the two wells is perpendicular to the underground roadway 3, and parallel to the two super-long drainage boreholes 10, each well is drilled into the coal seam 6, and a double-layer annular pipe 8 is set under the roof rock section 5, and the coal seam section A flower pipe 14 is arranged under the 6, and the outer layer of the double-layer annular pipe 8 is cemented with high-temperature-resistant cement 9 . Two superlong boreholes 10 for drainage are constructed so as to be parallel to the connection of two heat injection wells 1, and perpendicular to the roadway 3, and the superlong borehole 10 is airtightly drained at the entra...

Embodiment 3

[0046] Such as Figure 5 , 67 and 7, a method for extracting coalbed methane from coal seam groups by combined heat injection up and down the well. The coal seam spacing is 3m, the lower adjacent coal seam and the main mining coal seam spacing 4m, the near horizontal coal seam group of the main mining coal seam burial depth 400m, adopts the present invention to arrange two vertical heat injection wells 1, the well spacing 800m, and the underground roadway 3 vertically, each drilling well drills into the coal seams 6, 11, 12, a double-layer annular pipe 8 is set under the roof rock section 5, a single-layer casing 15 is set under the coal seam section 6, and along the double-layer annular pipe 8 and the single-layer casing The outer layer of the pipe 15 is cemented with high-temperature-resistant cement 9, and after cementing, a communication channel between the coal seam and the casing is made in each coal seam section. Construct two extraction tunnels 2 so that they are par...

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Abstract

The invention provides a method for extracting coal bed gas by up-hole and down-hole combination, and relates to the technical field of extracting the coal bed gas (or named as gas). The method can solve the technical problem of pre-extracting the coal bed gas of a coal bed, in particular for a low-permeability coal bed. The method for extracting the coal bed gas by the up-hole and down-hole combination comprises the following steps: carrying out vertical drilling into the coal bed from ground to the coal bed, carrying out an extracting channel in the down hole along the coal bed, and then closing the extracting channel to form a down-hole extracting system; and injecting overheating vapor or overheating water from the ground vertical to the coal bed, displacing the coal bed to flow into the down-hole extracting channel along the coal bed, and then transporting the extracted coal bed gas into a ground coal bed gas system. The method overcomes the deficiency of the prior art, can simply, reliably and efficiently pre-extract the coal bed gas of the coal bed, and in particular for the low-permeability coal bed in large areas, and can basically solve the problems of coal mine gas disasters and the coal bed gas exploitation.

Description

technical field [0001] The invention relates to a method for extracting coal bed methane (or called gas), in particular to a method for extracting coal bed methane from a single coal seam or a group of coal seams with low permeability. Background technique [0002] Coal mine gas has become a major safety hazard in coal production. Due to the extremely low permeability of coal seams in China, how to effectively extract coal seam gas is a major technical problem faced by all coal mines in the country. Almost all coal mines in the country have paid a huge amount for gas pre-extraction. Efforts and costs have yielded little. [0003] The main extraction methods of known coal mine gas to a single coal seam or coal seam group include: the coal seam drilling drainage in the coal mine roadway, the adjacent coal seam cross-layer drilling drainage, or the top roadway drainage method, etc.; the vertical well on the ground And its matching fracturing drainage method, and the multi-bran...

Claims

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Application Information

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IPC IPC(8): E21B43/00E21B43/30E21B43/26
Inventor 赵阳升冯增朝
Owner 赵阳升
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