Method of low-temperature gas-assisted coalbed methane fracturing technology

A technology of low-temperature gas and process method, which is applied in the fields of production fluid, earth-moving drilling, isolation device, etc., can solve the problem of lack of attention, and achieve the effect of improving fracture system and rock mechanical properties, preventing fracture closure and improving implementation effect.

Inactive Publication Date: 2014-04-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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AI Technical Summary

Problems solved by technology

[0011] At present, pure liquid nitrogen and liquid CO have been proposed and applied at home and abroad. 2 Fracturing or auxiliary coal bed gas fracturing process, mainly using liquid nitrogen and liquid CO 2 It has the advantages of gasification expansion,

Method used

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  • Method of low-temperature gas-assisted coalbed methane fracturing technology
  • Method of low-temperature gas-assisted coalbed methane fracturing technology
  • Method of low-temperature gas-assisted coalbed methane fracturing technology

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with accompanying drawing.

[0035] A method for low-temperature gas-assisted coalbed gas fracturing technology, the specific steps are as follows:

[0036] (1) Select a coalbed methane well, and select a glass fiber steel pipe with high strength, low temperature resistance and low thermal conductivity as the oil pipe 3;

[0037] (2) Pump the liquid nitrogen in the cryogenic gas storage tank 5 to the gas heating and temperature regulating device 7 through the cryogenic gas injection pump 6 and heat it to normal temperature 10-30°C, and then inject the liquid nitrogen into the oil pipe 3 and casing 2 through the gas injection line 8 Continuous injection in the annular space between the two, the injection speed is 30-60m 3 / min, in order to achieve the effect of thermal insulation and protective casing;

[0038] (3) Pump the liquid nitrogen in the low-temperature gas storage tank 5 to the gas heating a...

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Abstract

The invention relates to the field of oil and natural gas prospecting and exploitation, and provides a method of low-temperature gas-assisted coalbed methane fracturing technology. According to the method, by the aid of ultralow temperature characteristics of liquid nitrogen, cold shock transformation and ice formation are performed on a coalbed, ice blockage is caused to high-permeability channels (such as fractures), and effect of inorganic harmless dissoluble flowback fluid loss additives, even fracturing diverters and the like is achieved, so that the purpose of improving conventional coalbed methane fracturing technology is achieved. The method of the fracturing technology is suitable for primary fracturing of coalbed methane wells non-fractured or with natural fractures existing at the well bottoms, as well as refracturing of coalbed methane wells already fractured but low in productivity.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to a coal bed gas fracturing process. Background technique [0002] Coalbed methane, as an important unconventional natural gas resource, is increasingly valued by countries all over the world. Compared with conventional oil and gas reservoirs, coal rocks have the characteristics of low strength, low elastic modulus, low permeability, high Poisson's ratio, well-developed cleats, easy fracture, anisotropy, and severe heterogeneity. Coalbed methane is mainly stored on the inner surface of coal matrix pores in an adsorbed state, and only a small amount is stored in a free state in coal cleats and other fractures. The output of coalbed methane must go through the process of analysis, diffusion and seepage. [0003] Because the permeability of coal seams is generally very low, in order to increase the production capacity of CBM, artificial stimulation...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B36/00E21B33/13
Inventor 张亮任韶然范志坤罗炯车航杨勇
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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