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A multi-component thermal fluid enhanced recovery method for coalbed methane wells

A multi-component thermal fluid and coalbed methane well technology, which is applied in the fields of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of economic applicability and high cost, achieve intense molecular thermal movement, increase temperature, and promote desorption Effect

Active Publication Date: 2015-10-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the key to the development of gas injection stimulation technology lies in the gas source, that is, to find a natural carbon dioxide gas source, so the cost of this technology is relatively high, and its economic applicability is still questioned

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  • A multi-component thermal fluid enhanced recovery method for coalbed methane wells

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings, but the scope of implementation of the present invention is not limited.

[0013] The following takes a coalbed methane well in the eastern margin of the Ordos Basin as an example to explain the specific process and working principle of the present invention.

[0014] The CBM well is a directional well. The thickness of the coal seam is 8.87m (the vertical depth of the coal seam is 480m), the coal seam pressure is 3.60MPa, and the coal seam's critical desorption pressure is about 2.50MPa.

[0015] See figure 1 , To deliver pressurized coal bed gas to the multi-element thermal fluid generating device 6 through the produced coal-bed methane compression and pressurizing system 1, and then to deliver pressurized air to the multielement thermal fluid generating device 6 through the air compression and pressurizing system 3. After the igniter in the multi-element thermal fluid gener...

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Abstract

The invention discloses a coal bed gas well multiple thermal fluid strengthening mining method. Coal bed gas mined in other gas wells is compressed to be fuel, then mixed with pressed air, filled into a multiple thermal fluid generating device and combusted to generate high-temperature high-pressure mixed gas such carbon dioxide and nitrogen. Mined underground water filled with the mixture and processed is vaporized by the high-temperature high-pressure mixed gas to generate a multiple thermal fluid mainly comprising mixed gas of the high-temperature high-pressure steam, the carbon dioxide and the nitrogen. The generated multiple thermal fluid is filled into an underground coal bed along an oil pipe from a well mouth, shut-in and soak are performed and after sleeving pressure goes stable, the well is opened for production. The coal bed gas well multiple thermal fluid strengthening mining method solves the problem that a carbon dioxide source is hard to obtain.

Description

Technical field: [0001] The invention relates to an enhanced mining method of a coalbed methane well, in particular to a method for increasing the recovery rate of the coalbed methane well by injecting multiple thermal fluids into the coalbed methane well for soaking and puffing. Background technique: [0002] my country is rich in coalbed methane resources, but the low permeability and adsorption characteristics of coal reservoirs in my country are the bottleneck of coalbed methane development. Therefore, how to improve the permeability and desorption rate of coalbed methane to increase the production of coalbed methane is the current development and utilization of coalbed methane in my country. One of the main difficulties. In order to improve the permeability of coal seams and increase the recovery rate and production rate of coalbed methane, there are three main technologies currently adopted to increase the recovery rate of coalbed methane: hydraulic fracturing technology, di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B43/22
Inventor 冯其红张先敏张纪远舒成龙
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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