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

摘要/Abstract

摘要：

深部煤层气作为非常规天然气勘探开发的一个新领域,资源潜力巨大,但效益开发面临极大挑战,如何进行高效开发是当前亟待解决的难题。针对深部煤层气储层改造困难、支撑裂缝短的问题,基于储层压裂改造适用性分析优化压裂体系,延川南煤层气田开展了地质工程一体化储层改造关键技术攻关,取得了较好效果。研究表明：①深部煤层气资源潜力大,含气量较高,介于13~20 m³/t,但开发难度较大,单井日产气量较低,介于0~500 m³,储层改造困难;②根据井下观测,现有活性水压裂工艺技术有效支撑裂缝主要集中于井筒8 m范围以内,主缝延伸一般不到30 m;③深部煤层压裂应以形成有效长距离支撑、高导流能力的规模人工裂缝作为主攻目标,提高加砂强度配合大排量,同时研发“低密度、长运移”支撑剂,平均单井日增产气1 800 m³,为解决深部煤层气开发提供了新的思路。

关键词: 深部煤层气, 地质工程一体化, 储层改造, 有效支撑, 延川南

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

中图分类号:

TE37

姚红生,陈贞龙,郭涛,李鑫,肖翠,解飞. 延川南深部煤层气地质工程一体化压裂增产实践[J]. 油气藏评价与开发, 2021, 11(3): 291-296.

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