摘要
四川盆地页岩气水平井大多通过大段多簇细分切割技术进行压裂改造,由于大排量和大规模施工以及加密井完钻,井间干扰严重,导致页岩气井产能降低。优化增产措施和完井策略,明确水力压裂裂缝扩展规律,对降低井间压窜风险尤为重要。利用三维地质力学模型,在考虑储集层非均质性、地应力各向异性、裂缝间相互作用以及缝网分布的情况下,进行了相邻2口水平井的水力压裂裂缝扩展和防窜模拟。研究结果表明,水平应力差、天然裂缝密度和用液强度较大,逼近角和簇间距较小,均会导致较大的压窜风险。
In the Sichuan basin,most of horizontal shale gas wells are stimulated by subdivided fracturing with large⁃stage and multi⁃clus⁃ter.Large⁃scale operations at high displacement and well infilling are often associated with severe inter⁃well interferences,leading to a de⁃crease in well productivity.Optimizing stimulation treatments and well completion strategies and understanding the hydraulic fracture prop⁃agation rules are crucial to reducing the risk of inter⁃well frac⁃hit.Based on a 3D geomechanical model and with consideration to reservoir heterogeneity,in⁃situ stress anisotropy,interaction between fractures,and fracture network distribution,hydraulic fracture propagation and frac⁃hit prevention were simulated for two adjacent horizontal wells.The results show that large horizontal stress difference,natural fracture density and fluid intensity,or small approach angle and cluster spacing,may induce a high risk of frac⁃hit.
作者
王挺
汪杰
江厚顺
续化蕾
姚自义
南冲
WANG Ting;WANG Jie;JIANG Houshun;XU Hualei;YAO Ziyi;NAN Chong(Yangtze University,School of Petroleum Engineering,Wuhan,Hubei 430100,China;Yangtze University,Hubei Key Laboratory of Drilling and Production Engineering for Oil and Gas,Wuhan,Hubei 430100,China)
出处
《新疆石油地质》
CAS
CSCD
北大核心
2023年第6期720-728,共9页
Xinjiang Petroleum Geology
基金
国家自然科学基金(52274028)。
关键词
四川盆地
页岩气
三维地质力学模型
裂缝扩展
数值模拟
水平井
压窜
井间干扰
水力压裂
Sichuan basin
shale gas
3D geomechanical model
fracture propagation
numerical simulation
horizontal well
frac⁃hit
inter⁃well interference
hydraulic fracturing
