高导流自支撑酸化压裂室内实验研究  

Laboratory Experimental Research on High Conductivity Self-supporting Acid Fracturing

作　　者：周林波[1,2] 

机构地区：[1]页岩油气富集机理与有效开发国家重点实验室,北京100101 [2]中国石化石油工程技术研究院,北京100101

出　　处：《特种油气藏》2017年第4期152-155,共4页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项"缝洞型碳酸盐岩油藏高效酸压改造技术"(2011ZX05014-006)

摘　　要：针对常规酸化压裂刻蚀形成的点状支撑裂缝在高闭合应力条件下导流能力快速衰竭的问题,设计了一种新型的自支撑酸化压裂方式,实现酸蚀裂缝的面状支撑。运用室内酸蚀裂缝导流能力测试技术,测定了闭合应力为20~90 MPa条件下的自支撑裂缝导流能力。利用三维形貌扫描手段,评价了自支撑模式的缝面刻蚀特征和支撑高度。结果表明,自支撑模式下裂缝支撑高度提高约4倍,在闭合应力为50 MPa条件下酸蚀导流能力提高了41.8%,裂缝支撑的有效性、稳定性得到彻底改善。自支撑酸化压裂技术对于延长深井、超深井酸化压裂措施有效期以及提高深层油气藏开发效果具有重要意义。In order to solve the problem of fast depletion of conductivity of point-supporting fractures formed during conventional acid fracturing under high closure stress, a new type of self-supporting acid fracturing method was designed to achieve planar supporting of acid-eroded fractures. Laboratory testing technique for conductivity of acideroded fracture was used to measure the conductivity of self-supporting fractures when closure stress was 20- 90 MPa. 3D profilometry was used to evaluate the etching characteristics of fracture surface and supporting height of self-supporting mode. The research showed that the supporting height of fractures under self-supporting mode was improved for about 4 times, that conductivity by acid etching was improved at 41.8% when closure pressure was 50 MPa and that the efficiency and stability of fracture supporting were completely improved. Self-supporting acid- fracturing technique is important to extending effective duration of acid fracturing measures in deep and ultra-deep wells and improving development efficiency in ultra-deep reservoirs.

关 键 词：酸岩反应 酸蚀裂缝 自支撑 面支撑 导流能力 塔河油田 

分 类 号：TE355.5[石油与天然气工程—油气田开发工程]