石油钻采工艺2025，Vol.47Issue(2)：224-234,11.DOI:10.13639/j.odpt.202503023
多场耦合作用下深部煤层气水平井裂缝扩展及产气规律
Fracture propagation and gas production law of deep CBM horizontal wells under multi-field coupling effects
摘要
Abstract
In response to the key issues of unclear fracture propagation patterns and production dynamics of deep coalbed methane(CBM)horizontal wells with staged fracturing in the Shenfu block,this study aims to reveal the fracture propagation and gas production behavior under multi-field coupling effects,providing theoretical support for the efficient development of deep CBM.Based on geological data,well logging,fracturing,and production data from the Shenfu block,numerical simulation methods are employed,using the Benxi Formation 8+9#coal as the research object.A gas-water two-phase flow fracturing-production integrated numerical simulation method,considering adsorption/desorption effects in the flow-solid-damage(HMD)model,is proposed.This study investigates the control of fracturing section design parameters(cluster spacing)and geological parameters(stress difference,elastic modulus,and Poisson's ratio)on fracture propagation and evaluates the effects of reservoir fracturing on CBM development and optimization of the fracturing scheme.The numerical simulation results show that the HMD model is effectively applied to the study of fracture propagation and CBM development effects in deep CBM horizontal wells with staged fracturing.The ranking of geological and engineering parameters in terms of their control over fractures,from most to least influential,is as follows:stress difference>Poisson's ratio>elastic modulus>cluster spacing.After fracturing,the coal seam permeability and cumulative gas production increased by 167 times and 5.18 times,respectively,compared to before fracturing.Production simulation results indicate that the highest production is achieved when the fracture cluster spacing is between 20 and 22.5 meters.The study reveals the fracture propagation patterns under multi-field coupling effects in deep CBM horizontal wells,providing valuable insights for optimizing deep coalbed fracturing schemes and evaluating development effects.关键词
深部煤层气/水平井/分段压裂/裂缝扩展/产气规律/数值模拟Key words
deep coalbed methane/horizontal well/staged fracturing/fracture propagation/gas production behavior/numerical simulation分类
能源科技引用本文复制引用
梁渝,刘世奇,桑树勋,张守仁,张兵,王小东..多场耦合作用下深部煤层气水平井裂缝扩展及产气规律[J].石油钻采工艺,2025,47(2):224-234,11.基金项目
国家自然科学基金重点项目"煤系气高效勘探开发的岩石力学地层理论方法体系研究"(编号:42030810) （编号:42030810）
中海石油(中国)有限公司科技项目"煤层气增储上产技术研究"(编号:CNOOCKJ135ZDXM40ZL01). （中国）
