从闷井压力反演页岩油水平井压裂裂缝参数和地层压力  

Inversion of Fracture Parameters and Formation Pressure for Fractured Horizontal Wells in Shale Oil Reservoir Based on Soaking Pressure

作　　者：王飞[1] 吴宝成 廖凯 石善志 张士诚[1] 李建民 索杰林 WANG Fei;WU Baocheng;LIAO Kai;SHI Shanzhi;ZHANG Shicheng;LI Jianmin;SUO Jielin(School of Petroleum Engineering,China University of Petroleum,Beijing 102249,China;Research Institute of Engineering Technology,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000,China;School of Petroleum Engineering,Karamay Campus,China University of Petroleum(Beijing),Karamay,Xinjiang 834000,China)

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249 [2]中国石油新疆油田分公司工程技术研究院,新疆克拉玛依834000 [3]中国石油大学(北京)克拉玛依校区石油学院,新疆克拉玛依834000

出　　处：《新疆石油地质》2022年第5期624-629,共6页Xinjiang Petroleum Geology

基　　金：国家自然科学基金(51974332);新疆维吾尔自治区自然科学基金(2022D01B79)。

摘　　要：页岩油压裂水平井投产前普遍先闷井,为快速评价体积压裂效果,提出基于页岩油藏闷井压力数据的压后评估方法。通过闷井数值模拟,表征压裂水平井缝网改造区域的压力扩散与流体运移规律,并建立闭合后线性流计算模型和裂缝储集控制数学模型,形成反演裂缝参数与地层压力的计算方法。结果表明,压裂停泵后改造区域依次经历井筒末段裂缝控制、全井段裂缝控制以及储集层基质控制下的9个流动阶段,其压降导数在双对数坐标下为不同斜率的多个直线段;应用于吉木萨尔凹陷4口典型页岩油水平井,证明了闷井压力数据能用于裂缝参数和地层压力反演,也验证了提出方法的适用性,可供评价压裂作业效果和优化平台井距借鉴。A fractured horizontal well in shale oil reservoir should be soaked before it is put into production.In order to quickly evaluate the effect of volume fracturing,a post-frac evaluation method based on the data of soaking pressure of shale oil reservoirs was proposed.Through numerical simulation of well soaking,the pressure diffusion and fluid migration in the stimulation area controlled by the fractured horizontal well were characterized,and a post-closure linear flow calculation model and a fracture storage control calculation model were established.Then a calculation method for inverting fracture parameters and formation pressure was formed.The results show that after pump is stopped,the stimulation area goes through 9 flow stages such as flows controlled by fractures in end section of wellbore,by fractures in the whole wellbore and by reservoir matrix,and the pressure drop derivatives appear as multiple straight-line segments with different slopes in log-log coordinates.This method has been applied to four typical shale oil horizontal wells in Jimsar sag,which proves that the data of soaking pressure can be used for the inversion of fracture parameters and formation pressure,and also verifies the applicability of the proposed method.The study results provide a reference for evaluating fracturing effect and optimizing well spacing.

关 键 词：吉木萨尔凹陷 页岩油 水平井 体积压裂 闷井 压降 地层压力 数值模拟 

分 类 号：TE357[石油与天然气工程—油气田开发工程]