延川南深部煤层气地质工程一体化压裂增产实践

doi:10.13809/j.cnki.cn32-1825/te.2021.03.003

Abstract

Abstract:

As a new field of unconventional natural gas exploration and development, deep coalbed methane（CBM） has great resource potential, but its benefit development faces great challenges. How to carry out efficient development is a problem needed to be solved at present. In order to achieve stable production and steadily promote the expansion of the gas field, focusing on how to realize the problem of “long fracture and far support” in reservoir reconstruction, Yanchuannan gas field has achieved good results through fracturing optimization and tackling key problems of deep coalbed methane geology-engineering integration. The research shows that: ①Deep CBM has great resource potential with a high gas content of 13~20 m ³/t, but it is difficult to develop and transform the reservoir and the daily production of single well is low, only of 0~500 m³/d; ②According to the underground observation, in the existing active hydraulic fracturing technology, the effective supporting seams mainly distributes within eight meters of the wellbore, and the main fracture extension is generally less than 30 m; ③Deep coal seam fracturing should take the large-scale artificial fracture with long-distance support and high conductivity as the main target to improve the sand adding strength with large displacement, and at the same time develope “low density and long migration” proppant. The average daily gas production of single well is 1 800 m ³. It provides a new idea for the deep CBM development.

Key words: deep coalbed methane（CBM）, geology-engineering integration, reservoir reconstruction, effective support, Yanchuannan Field

CLC Number:

TE37

YAO Hongsheng,CHEN Zhenlong,GUO Tao,LI Xin,XIAO Cui,XIE Fei. Stimulation practice of geology-engineering integration fracturing for deep CBM in Yanchuannan Field[J].Petroleum Reservoir Evaluation and Development, 2021, 11(3): 291-296.

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参数	深度
参数	1 000 m以深	800~1 000 m
含气量（m³/t）	11~20	8~12
渗透率（10^-3 μm ²）	<0.1	0.1~0.5
停泵压力（MPa）	>30	10~20
矿化度（mg/L）	>80 000	2 500~10 000
地应力	随深度增加,垂向主应力增大幅度最大,最小主应力增大幅度较小,1 000 m以深易形成垂直裂缝

Stimulation practice of geology-engineering integration fracturing for deep CBM in Yanchuannan Field

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