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Novel coalbed gas thermal recovery process

A coalbed methane and new process technology, applied in the direction of mining fluid, earth cube drilling, wellbore/well parts, etc., can solve the problems of coal seam original structure damage, plastic enhancement, unsatisfactory effect, etc., to achieve clean mining, increase production, The effect of enhanced oil recovery

Inactive Publication Date: 2009-03-11
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the coal-bearing strata in my country have generally experienced strong tectonic movements after coal formation, the original structure of the coal seam is often greatly damaged, and the plasticity is greatly enhanced. As a result, the original cracks and cuts cannot be further expanded during hydraulic fracturing. However, no new longer hydraulic fractures can be produced, and the plastic deformation mainly occurs in the coal seam. Generally speaking, the effect is not ideal

Method used

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  • Novel coalbed gas thermal recovery process
  • Novel coalbed gas thermal recovery process
  • Novel coalbed gas thermal recovery process

Examples

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Effect test

Embodiment 1

[0032] Single well heating coalbed methane drainage technology, such as figure 1As shown in a single well: in the coal seam, according to the geological structure of the coal seam, drill holes or use the original gas production well 1 to the bottom of the coal seam 2, put hot coke under the hole, and press in air or oxygen-enriched, so that The coke and the coal seam at the bottom of the hole are partially burned, and the heat generated by the combustion is transferred to the coal seam to heat the coal seam. When the coal seam is within the design range and reaches 100°C, stop supplying air or oxygen enrichment, and open the wellhead to discharge the exhaust gas cleanly. , according to the measurement of gas outlet gas composition, collect coalbed methane (mainly CH 4 ), which can significantly increase the single well CBM production. Another method is to reduce the amount of air or oxygen enrichment, so that the hot flue gas (mainly composed of CO) produced by combustion 2 ...

Embodiment 2

[0034] Vertical well group blind hole heating coalbed methane drainage process, drilling a vertical well 5 in the coal seam 10, see figure 2 , according to the well layout requirements of coalbed methane production and the expansion of the temperature field obtained from the test, four gas production wells (3, 4, 8, 9) are drilled at appropriate distances around the hole. After laying hot coke at the bottom of the hole 5, a gas supply pipe 6 is lowered, and gasification agent is supplied into the gas supply pipe 6, and the coal seam 10 is ignited with hot coke. The coal gas is discharged from the space 7 to realize the gasification of the blind holes to produce gas and heat the coal seam 10 at the same time. After coal seam 10 is heated, coalbed methane is collected in well 3, well 4, well 8 and well 9, and the output of coalbed methane will increase greatly.

Embodiment 3

[0036] Horizontal directional well layered gasification heating coalbed methane mining technology, in two or more coal seams, if the distance 16 between the coal seams is within 50m, the upper layer and the upper layer can be heated by gasifying the lower (or middle) coal seam 13 Lower seam coal 15, such as image 3 shown. In the lower (or middle) coal seam 13, horizontal directional wells 12 are arranged, and vertical air intake wells 11 are constructed to form an underground combustion gasifier. The gasifier generally chooses a thinner coal seam and is lowered at the bottom of the vertical well 11. Coke, ignites the coal seam, and feeds the gasification agent. When the gasification agent is air, it can produce low calorific value gas. When blowing in oxygen-enriched or pure oxygen-water vapor, it can produce medium calorific value gas, which is discharged from the directional well 12. gas. Arrange coalbed methane production wells 14 in the upper (lower) coal seam 15 of the...

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Abstract

The invention relates to a new coalbed gas thermal production process which is characterized in that full hot coke is arranged on the lower part of a coalbed gas production well or a gasification well, a gasification agent is pressed in so as to ignite a hole bottom coalbed; and the heat released from the combustion of part of the coalbed can heat up the adjacent coalbed, and improve the analysis capability, permeability coefficient and osmotic pressure of the coalbed, thereby improving the gas yield of the coalbed.

Description

technical field [0001] The invention belongs to the technical field of coal bed methane mining technology, and in particular relates to a process method for increasing the output of coal bed methane by heating coal seams. Background technique [0002] my country's coalbed methane resources are relatively rich, but the utilization rate of coalbed methane is still relatively low, and the mining technology and production increase technology of coalbed methane are relatively backward. At present, the mining methods of coalbed methane mainly include: ground vertical well mining, ground mining area mining, underground gas drainage and coalbed methane drainage from abandoned mines. Surface vertical well mining is to drill a well on the ground to enter the coal seam that has not yet been mined. The adsorbed gas in the coal seam is desorbed through drainage and pressure reduction, and flows from the wellbore to the ground. This mining method has large gas production, high resource r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24
Inventor 梁杰刘丽梅李延生梁新星
Owner ENN SCI & TECH DEV
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