基于裂缝中流体渗流特征的迂曲度计算新方法  

New tortuosity calculation based on fluid migration characteristics in fracture

作　　者：彭娇[1,2] 曲冠政 卫海涛 刘安邦 贺沛 周德胜 PENG Jiao;QU Guanzheng;WEI Haitao;LIU Anbang;HE Pei;ZHOU Desheng(College of Petroleum Engineering, Xi′an Shiyou University, Xi′an 710065, China;Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs, Xi′an 710065, China;Oil Production Technology Institute, Dagang Oilfield Company, PetroChina, Tianjin 300280, China;Research Institute of Yanchang Petroleum (Group) Co., Ltd., Xi′an 710075, China)

机构地区：[1]西安石油大学石油工程学院,陕西西安710065 [2]陕西省油气田特种增产技术重点实验室,陕西西安710065 [3]中国石油大港油田分公司采油工艺研究院,天津300280 [4]陕西延长石油(集团)有限责任公司研究院,陕西西安710075

出　　处：《断块油气田》2019年第4期495-500,共6页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金项目“磁激励下纳米磁流体-残余油界面赋存状态及残余油的启动机制”(51804255);陕西省教育厅专项科研计划项目“支撑剂在粗糙裂缝中的沉降及二次启动演化规律研究”(18JK0611)

摘　　要：文中从流体渗流的本质出发,推导了采用渗流速度表征的迂曲度计算公式;根据随机选取的裂缝剖面线在不同精度下的表现,将其拆分为V形、曲率弧线和凹槽结构;将存在接触面积的剪切滑移裂缝结构简化为被随机分布的圆柱体、球形体和方形体充填的平行板模型;采用剖面线基本组成单元体、随机充填的平行板模型,结合Kozeny-Carmann方程考察推导的迂曲度公式的准确性,并拟合迂曲度与孔隙度的关系。结果表明:渗流迂曲度可用沿渗流方向的速度与渗流总速度的比值表示;所推导的迂曲度计算公式能满足计算精度要求;圆柱体、方形体和球形体接触面积等效体的孔隙度与迂曲度关系曲线拟合度均较高。Based on fluid migration essence, the tortuosity calculation formula described by seepage velocity is derivated;according to the fracture profile shape in various accuracy, the random profile is split into V shape, curvature curve and groove structure;the shear slipping fracture which includes contact area is simplified into parallel plate model with randomly filled cylinder, spherome and cuboid;then combined with Kozeny-Carmann equation, the tortuosity equation accuracy is checked by random profile units, randomly filled parallel plate model;finally, the relationship between tortuosity and porosity is fitted. The results show that the tortuosity could be described by the ratio of velocity along the fluid flow direction to the total seepage velocity;the derived tortuosity formula satisfies the calculation accuracy. The porosity-tortuosity relationships of the cylinder, cuboid and spherome contact area equivalent bodies fit well.

关 键 词：渗流特征 迂曲度 裂缝结构 数值模拟 LATTICE Botlzmann方法 

分 类 号：TE312[石油与天然气工程—油气田开发工程]