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Coal bed gas well multiple thermal fluid strengthening mining method

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 improve production efficiency. Yield effect

Active Publication Date: 2013-05-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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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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  • Coal bed gas well multiple thermal fluid strengthening mining method

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Embodiment Construction

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

[0013] The specific process and working principle of the present invention will be explained below by taking a coalbed methane well on the eastern edge of the Ordos Basin as an example.

[0014] The coalbed methane well is a directional well, and the thickness of the coal seam drilled is 8.87m (vertical depth in the middle of the coal seam is 480m), the coal seam pressure is 3.60MPa, and the critical desorption pressure of the coal seam is about 2.50MPa.

[0015] see figure 1 , deliver pressurized coalbed methane to the multi-element thermal fluid generator 6 through the extracted coalbed methane compression and pressurization system 1, and then deliver pressurized air to the multi-element thermal fluid generator 6 through the air compression and pressurization system 3, After the igniter in th...

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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 a method for intensified exploitation of a coalbed gas well, in particular to a method for increasing the recovery rate of the coalbed gas well by injecting multi-component thermal fluid into the coalbed gas well for huffing and puffing. Background technique: [0002] my country is rich in coalbed methane resources, but the low permeability and adsorption characteristics of coalbeds in my country are the bottlenecks for the development of coalbed methane. Therefore, how to improve the permeability and desorption rate of coalbeds, and then 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, the following three technologies are generally adopted to enhance the recovery rate of coalbed methane: hydraulic fracturing...

Claims

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Application Information

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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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