Analysis and application of key influencing factors of CBM well fracturing effects in Shizhuang area, Qinshui basin

Authors

XUE Haifei, Jincheng Branch of China United Coalbed Methane Corporation, Jincheng 048000, China
ZHU Guanghui, China United Coalbed Methane Corporation, Beijing 100016, China
WANG Wei, China United Coalbed Methane Corporation, Beijing 100016, China
LU Xiaoxia, China United Coalbed Methane Corporation, Beijing 100016, China
WANG Minghao, Jincheng Branch of China United Coalbed Methane Corporation, Jincheng 048000, China
WANG Yanbin, School of Resources and Gescience, China University of Mining and Technology, Beijing 100083, China

Abstract

CBM fracturing effect has many influencing factors. Development effect with the same technology is different in different area. Based on a large amount of geological and engineering data in Shizhuang block, it was found that high geo-stress affects fracture extension and support in CBM fracturing, and difference between horizontal stress affects fracture direction and morphology. Coal seam with poor coal structure can produce large amount of gum during fracturing, which will block the diversion channel and result in poor fracturing effect. Engineering factors affecting fracturing effect mainly include the fracturing fluids performance, displacement, prepad fluid proportion and hole enlargement ratio. Finally, a serie of optimized technique was proposed, including "2%KCl+water, ladder displacement injection, prepad fluid volume 180-240 m³, perforation optimization and hydraulic networks fracturing". It was pointed out that the well pattern of CBM fracturing was important to fracturing effects and economics. Field practice shows that the research results have strong guiding significance for CBM development.

Keywords

Qinshui basin, Shizhuang block, fracturing influencing factors, geo-stress, coal structure, parameter optimi-zation

DOI

10.3969/j.issn.1001-1986.2019.04.012

Recommended Citation

XUE Haifei, ZHU Guanghui, WANG Wei, et al. (2019) "Analysis and application of key influencing factors of CBM well fracturing effects in Shizhuang area, Qinshui basin," Coal Geology & Exploration: Vol. 47: Iss. 4, Article 13.
DOI: 10.3969/j.issn.1001-1986.2019.04.012
Available at: https://cge.researchcommons.org/journal/vol47/iss4/13

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