裂缝性碳酸盐岩酸蚀蚓孔数字化分析  

Numerical Analysis of Acid-Corroded Wormholes in Fractured Carbonate Rocks

作　　者：吴红军[1] 孔嫦娥[1] 伊向艺[2,3] 张晖[1] 刘辉[1] 吴元琴[2] 

机构地区：[1]中国石油塔里木油田分公司油气工程研究院,新疆库尔勒841000 [2]成都理工大学能源学院,成都610059 [3]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059

出　　处：《钻井液与完井液》2016年第4期105-108,共4页Drilling Fluid & Completion Fluid

基　　金：国家自然科学基金"高黏度酸液酸岩反应动力学机理研究"(51274050)

摘　　要：在裂缝性碳酸盐岩储层酸压过程中容易形成酸蚀蚓孔,有效沟通渗流通道,而酸液滤失前/后裂缝表面形态的研究,存在着描述的量化问题。利用三维激光扫描仪对滤失前后裂缝壁面形态进行扫描及数字化处理,量化地描述酸蚀蚓孔。数字化分析研究表明,从数字化得出的裂缝壁面形态等值线图与三维图可清楚看到裂缝壁面酸蚀蚓孔形态;从裂缝间距等值线图和三维图可直接得到酸蚀蚓孔在不同位置处的大小;从裂缝壁面吻合度柱状图和裂缝间距分布柱状图,可得到酸蚀蚓孔不同间距的点云数量及其所占比例,计算酸蚀蚓孔体积,为酸压设计提供指导作用。Acid-corroded wormholes generated in acid fracturing of carbonate rocks play an important role in flow channel communication. A quantitative characterization of the surface of the fracture planes before and after acid corrosion has not yet been found. The acidcorroded wormholes can be quantitatively characterized with a 3D laser scanner which scans the surface of the fracture planes before and after filtration of acid and numerically processes the data obtained. Studies show that the isogram and the 3D plots of the fracture planes give a clear picture of the acid-corroded wormholes. The dimensions of different spots in a wormhole can be obtained from the isogram and 3D plots of the fracture spacings. The number and the proportion of the cloud points of the different spacings in acidcorroded wormholes can be obtained from the matching histogram of the fracture planes and the histogram of the spacing distribution of the fractures. Using these data, the volume of the acid-corroded wormholes can be calculated, providing guidance to acid fracturing design.

关 键 词：天然裂缝 酸蚀蚓孔 数字化分析 裂缝间距 蚓孔体积 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]