克拉玛依陆相油砂注水过程中的剪胀诱导渗透率模型  

A model of shear dilation induced permeability evolution in the process of water injection in Karamay continental oil sand

作　　者：高彦芳 王晓阳[2] 任战利[1] 陈勉[3] 姜海龙 GAO Yanfang;WANG Xiaoyang;REN Zhanli;CHEN Mian;JIANG Hailong(Department of Geology,Northwest University,Xi’an 710069,Shaanxi,China;SINOPEC Research Institute of Petroleum Engineering,Beijing 102206,China;College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;Mechanical Engineering College,Xi’an Shiyou University,Xi’an 710065,Shaanxi,China)

机构地区：[1]西北大学地质学系 [2]中国石化石油工程技术研究院 [3]中国石油大学(北京)石油工程学院 [4]西安石油大学机械工程学院

出　　处：《石油钻采工艺》2021年第2期244-249,共6页Oil Drilling & Production Technology

基　　金：国家自然科学基金项目“超深井井筒安全构建工程基础理论与方法”(编号:U1762215);陕西省自然科学基础研究计划项目“超压气藏垂直裂缝井产能来源分析和渗流机理研究”(编号:2021JM-407);陕西省教育厅专项科研计划项目“基于流固耦合的超深高压高产气井渗流特征和出砂机理研究”(编号:20JK0843)。

摘　　要：特超稠油油藏普遍采用蒸汽辅助重力泄油(SAGD)方式开发,在前期注水改造阶段储层剪胀扩容导致剪切带产生剪切裂缝,孔隙度和含水/油饱和度发生变化。为了研究注水过程中水的有效渗透率的动态演化规律,考虑孔隙度和含水饱和度随扩容体积应变的变化,通过Kozeny-Poiseuille方程和Touhidi-Baghini方程关联绝对渗透率和孔隙度的关系,通过油、水两相相渗曲线方程关联水的有效渗透率和含水饱和度的关系,建立了3个剪胀诱导渗透率演化数学模型,并根据实验数据对各个模型的预测效果进行了评价分析。研究结果表明,传统的Kozeny-Carman方程只适用于孔隙性颗粒介质,不适用于克拉玛依陆相油砂这种由沥青基底式胶结形成的复合材料骨架,也不适用描述剪切扩容带内剪切裂缝引起的渗透率演化。基于Touhidi-Baghini方程建立的剪胀诱导渗透率模型,可以准确预测注水过程中水的有效渗透率演化规律,为渗透率的相关研究提供参考。Extra-super heavy oil reservoirs are generally developed by means of steam assisted gravity drainage(SAGD).In the early water injection stage,reservoir’s shear dilation generates shear fractures in the shear zone,which leads to the change of porosity and water/oil saturation.In order to study the dynamic evolution laws of the effective permeability in the process of water injection,t his paper related absolute permeability with porosity through Kozeny-Poiseuille equation and Touhidi-Baghini equation and water effective permeability with water saturation through oil and water relative permeability curve equations,in view that porosity and water saturation vary with dilation volumetric strain.Then,three mathematical models of shear dilation induced permeability evolution were established.In addition,the prediction effects of each model were evaluated and analyzed based on experimental data.It is indicated that the traditional Kozeny-Carman equation is only applicable to porous granular media,but not to Karamay continental oil sand,which is the composite skeleton composed of bitumen basement type cementation,and neither to describe the permeability evolution induced by the shear fractures in the shear dilation zone.What’s more,the shear dilation induced permeability model established on the basis of Touhidi-Baghini equation can accurately predict the evolution laws of water effective permeability in the process of water injection,so as to provide reference and experience for the studies related to permeability.

关 键 词：特超稠油油藏 油砂 剪胀 渗透率 注水 沥青 剪切带 

分 类 号：TE345[石油与天然气工程—油气田开发工程]