深井重复压裂裂缝起裂模型  

Model of fracture initiation of the refracturing deep wells

作　　者：李玉伟[1] 李修辅 刘佳[3] 赵万春[1] 焦石[4] 

机构地区：[1]大庆石油学院教育部提高采收率重点实验室,黑龙江大庆163318 [2]大庆钻探工程公司钻井一公司,黑龙江大庆163411 [3]大庆油田有限责任公司第六采油厂,黑龙江大庆163114 [4]辽河油田分公司勘探开发经济评价中心,辽宁盘锦124010

出　　处：《大庆石油学院学报》2009年第5期64-67,73,共5页Journal of Daqing Petroleum Institute

摘　　要：考虑固流热耦合作用,建立深井重复压裂井周围孔隙压力诱导最大主应力和主应力方位角数学模型.基于初次人工裂缝对应力场的影响,建立初次人工裂缝诱导应力场模型,再根据线性叠加原理,得到深井重复压裂井周围应力场分布模型;最终根据断裂力学裂纹破裂准则,建立深井重复压裂裂缝起裂角数学模型.应用该模型对5口重复压裂深井进行计算,现场实测裂缝转向角为76°,在有限元软件模拟的裂缝转向方位角60°-90°范围内,模拟结果与实测数据吻合,表明计算的深井重复压裂裂缝起裂角范围准确.Considering the effect of solid-flow-heat coupled,a mathematical model is established,which describes the maximum principal stress and orientation angle of maximum principal stress induced by pore pressure around refracturing deep wells.Considering the impact of the initial artificial fracture upon stress field,the model of stress field induced by initial artificial fracture is established.According to the linear superimposition law,model of stress field distribution around refracturing deep wells is established.According to the breakdown formula of the crack,a model of fracture initial angle of refracturing deep wells is set up.The model is applied to calculate five refracturing wells.The reorientation angle of fracture in field practice is 76°,which is in the range of simulation result 60-90°.The simulation results coincide well with the measured data,we find that the range of angle in refracturing wells is precise.

关 键 词：深井 重复压裂 裂缝起裂 诱导应力 固流热耦合 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]