水平井分段多簇压裂缝间干扰影响分析  

The Analysis of Crack Interaction in Multi-stage Horizontal Fracturing

作　　者：赵金洲[1] 陈曦宇 刘长宇[1] 李勇明[1] 李晖[2] 曹学军[2] 

机构地区：[1]西南石油大学"油气藏地质及开发工程"国家重点实验室,四川成都610500 [2]中国石化西南石油工程有限公司井下作业处,四川德阳618000

出　　处：《天然气地球科学》2015年第3期533-538,共6页Natural Gas Geoscience

基　　金：国家自然科学基金(编号:51344005);国家重点基础研究发展计划("973"计划)项目(编号:2013CB228004);国家科技重大专项(编号:2011ZX05014-006)联合资助

摘　　要：水平井分段多簇压裂在低渗透油气藏开发中发挥了巨大作用。为进一步提升油气产量,压裂段、簇数近年不断增加,同时也加剧了缝间干扰问题。合理利用裂缝产生的诱导应力干扰能够促使裂缝网络形成,使得储层改造体积增大。但是过高的诱导应力干扰也可能导致裂缝起裂困难,甚至造成裂缝砂堵,所以应当对缝间干扰问题进行相关研究。对此,采用位移不连续法建立了研究多簇裂缝诱导应力的数学模型,从局部应力场改变、起裂压力、裂缝宽度多方面研究了缝间干扰对分段多簇压裂造成的影响。模拟结果表明,诱导应力会导致局部区域水平主应力差异下降、破裂压力陡升、裂缝宽度下降等。分析显示,分段多簇压裂在利用诱导应力促进缝网形成的同时,也需要防止其对施工造成困难。研究结论对水平井分段多簇压裂具有指导意义。Multi-stage horizontal fracturing has played a huge role in the exploitation of low permeability reservoirs. To further enhance the production, the numbers of fracturing stages and clusters are increasing, which result in the serious crack interaction. Crack interaction is conducive to form complex fracture network,which raises the stimulation reservoir volume. However,serious crack interaction also results in the difficulty of fracture initiation and the sand plug,therefore study of crack interaction should be implemented. Based on the displacement and discontinuity method, mathematical models are established to analyze the crack interaction in multiple clusters fractures, from the change of induced stress field, initiation pressure and fracture width. The simulation results show that,induced stress can lead to change of horizontal stress in local area, fracture pressure and fracture width. The result indicates that the induced stress should be controlled to get a favorable stimulation. The result helps to optimize the stimulation of multiple stages horizontal well.

关 键 词：位移不连续法 缝间干扰 诱导应力 多簇压裂 裂缝宽度 

分 类 号：TE34[石油与天然气工程—油气田开发工程]