冲击压裂技术促进页岩油储层缝高扩展的可行性  

Feasibility of pressure shock fracturing to improve fracture height growth in shale oil formation

作　　者：张啸寰 张士诚[1] 邹雨时[1] 石善志 李建民 王俊超 ZHANG Xiaohuan;ZHANG Shicheng;ZOU Yushi;SHI Shanzhi;LI Jianmin;WANG Junchao(School of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;Engineering Technology Institute,PetroChina Xinjiang Oilfield Company,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

出　　处：《中国石油大学学报（自然科学版）》2024年第6期105-113,共9页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：中石油战略合作科技专项(ZLZX2020-01-07)。

摘　　要：应用吉木萨尔芦草沟组储集层露头制备层状试样开展水平井压裂物理模拟试验。通过恒速注入和快速释放累积高压获得2种增压状态,分别对应于常规和压力冲击条件。结果表明:恒速注入条件下露头破裂压力小于15 MPa,倾向于形成近井筒纹层缝,裂缝高度受限;在压力冲击条件下,井底压力远超岩石常规破裂压力,所形成裂缝高度大幅提高;冲击压力对裂缝高度影响显著,冲击压力32 MPa条件下裂缝平均高度较恒速注入压裂增长41.2%,冲击压力55 MPa条件下裂缝高度较恒速注入压裂增长1.28倍;冲击次数的提高一定程度上可增加裂缝高度,3次冲击压裂较1次冲击压裂裂缝高度增长50%。The physical simulation experiment of horizontal well fracturing was carried out by using layered samples prepared from reservoir outcrops of Lucaogou Formation in Jimsar.Two pressurization states were obtained by constant speed injection and rapid release of accumulated high pressure,which correspond to conventional and pressure shock conditions,respectively.It is found that the outcrop breakdown pressure is less than 15 MPa under the condition of constant-rate injection in horizontal wells,which tends to form activated laminas near the wellbore,and the fracture height is limited.Under the condition of pressure shock,the bottom hole pressure is much higher than the conventional rock breakdown pressure,and the fracture height is greatly increased.The shock pressure has a significant impact on the fracture height.Under the condition of shock pressure of about 32 MPa,the average height of fractures increased by 41.2%.Under the shock pressure of 55 MPa,the fracture height increased by 1.28 times.The increased number of times of shock can also improve fracture height growth to a certain extent.The fracture height of three shock fracturing is 50%higher than that of one shock fracturing.

关 键 词：页岩油 冲击压裂 裂缝高度 密集纹层 储层改造 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]