直井缝内暂堵转向压裂分支缝起裂方向研究  

Starting direction of the branch fracture of temporary plugging diverting fractures in vertical wells

作　　者：胡智凡 王贤君[1,2] 王晓娟 王维 陈希迪[1,2] HU Zhifan;WANG Xianjun;WANG Xiaojuan;WANG Wei;CHEN Xidi(Oil Production Engineering Research Institute of Daqing Oilfield Co.,Ltd.,PetroChina,Daqing,Heilongjiang 163453,China;Heilongjiang Provincial Key Laboratory of Oil and Gas Reservoir Stimulation,Daqing,Heilongjiang 163453,China;NO.3 Oil Production Plant of Daqing Oilfield Co.,Ltd.,PetroChina,Daqing,Heilongjiang 163000,China)

机构地区：[1]中国石油大庆油田有限责任公司采油工程研究院,黑龙江大庆163453 [2]黑龙江省油气藏增产增注重点实验室,黑龙江大庆163453 [3]中国石油大庆油田有限责任公司第三采油厂,黑龙江大庆163000

出　　处：《石油地质与工程》2022年第5期111-114,共4页Petroleum Geology and Engineering

基　　金：中国石油天然气股份有限公司重大科技专项“外围油田改善开发效果及提高采收率技术研究与应用”(2016E-0209)。

摘　　要：直井缝内暂堵转向压裂分支缝起裂方向不明确,增产效果不明显。为此,基于多孔介质流固耦合理论模型,通过有限元软件进行有限元模拟缝内暂堵转向压裂分支缝形成过程,研究不同水平应力差条件下,主裂缝暂堵后最大水平主应力方向的变化。结果表明,分支缝与主裂缝并不垂直,二者存在一个小于90°的夹角,水平应力差越小,夹角越大,分支缝压裂效果越好。建立的分支缝与主裂缝夹角定量计算数值模型,可用来预测分支缝与主裂缝夹角。对比2口井分支缝与主裂缝夹角模型计算结果及井下微地震监测结果,验证了模型的准确性。The starting direction of the branch fracture of temporary plugging diverting fractures in vertical wells is not clear.Therefore,based on the fluid solid coupling theoretical model of porous media,the finite element software is used to simulate the formation process of the branch fracture of temporary plugging diverting fractures,and the change of the maximum horizontal principal stress direction after the temporary plugging of the major fractures under different horizontal stress differences is studied.The results show that the branch fracture is not perpendicular to the major fracture,and there is an included angle of less than 90°.The smaller the horizontal stress difference is,the larger the included angle is,the better the fracturing effect of the branch fracture is.The established numerical model for quantitative calculation of the angle between the branch fracture and the major fracture can be used to predict the angle between them.The accuracy of the model is verified by comparing the calculation results of the angle model of two wells and the underground micro-seismic monitoring results.

关 键 词：缝内暂堵 转向压裂 分支缝 起裂方向 主裂缝 

分 类 号：TE357[石油与天然气工程—油气田开发工程]