摘要
酸压是碳酸盐岩储层改造的常规手段,酸液对岩石的非均质刻蚀使得裂缝表面呈现独特的形态特征,目前针对酸蚀前后裂缝表面形态特征的研究还不够深入。因此,通过室内实验借助3D扫描技术获得真实酸蚀裂缝表面几何形态数据,引入新的表征参数hn和εh,定量描述了裂缝表面的起伏程度,对比了酸蚀前后裂缝表面形态的变化。结果表明:酸蚀反应掉水力裂缝的槽点;沿酸液流动方向形成明显的沟槽,凸起部分变缓,曲折比减小,总体起伏程度增大;垂直酸液流动方向上形成了连续的上下波动,曲折比和起伏程度均增大。
Acid fracturing is a common method for stimulating carbonate reservoir.The surface characteristics of acid-etched fracture is unique due to the non-uniform acid-etching.At present,the research on geometric feature of fracture surface before and after etching is not enough.In this paper,advanced experimental devices were used to obtain real acid-etched fracture samples,then the geometric characteristics of the fracture surface were analyzed by using 3D scanning data,and the new parameters hn andεh were defined to quantitatively describe the fluctuation degree.Furthermore,the change of fracture surface patterns before and after acid-etching were compared.The results show that gullies and holes were formed on the fracture surface and the fluctuation degree increased,the tortuosity decreased along the flow direction and increased vertically to flow direction after acid-etching.
作者
冯炜
杨晨
陶善浔
王财忠
陆彦颖
张路锋
周福建
FENG Wei;YANG Chen;TAO Shanxun;WANG Caizhong;LU Yanying;ZHANG Lufeng;ZHOU Fujian(College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;Department of Geosciences,University of Padova,Padova 35131,Italy;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;CCDCDrilling and Production Technology Research Institute,Guanghan 618300,Sichuan,China)
出处
《岩性油气藏》
CSCD
北大核心
2020年第3期166-172,共7页
Lithologic Reservoirs
基金
国家科技重大专项“超深裂缝性气藏井筒失稳机理及转向工艺优化研究”(编号:2016ZX05051)资助。
关键词
酸岩反应
裂缝表面形态
表征参数
起伏程度
acid-rock reaction
surface feature
description parameters
fluctuation degree
