裂缝各向异性介质方向渗透率半解析计算方法  

Semi-analytical calculation method for directional permeability of fractured anisotropic media

作　　者：冯月丽 刘月田 毛小龙 陈健 丁祖鹏 Feng Yueli;Liu Yuetian;Mao Xiaolong;Chen Jian;Ding Zupeng(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;CNOOC Research Center,Beijing 100028,China)

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249 [2]中海油研究总院,北京100028

出　　处：《能源与环保》2020年第11期82-87,92,共7页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：国家自然科学基金项目(51374222);国家科技重大专项(2017ZX05032004-002);国家重点基础研究发展计划(2015CB250905);中国石油重大科技专项(2017E-0405)。

摘　　要：裂缝性油藏一般发育有一组或多组裂缝,每组裂缝大都有各自比较一致的方向性。由于裂缝的存在,使得油藏的渗透率具有各向异性特征。为此,基于多边形保角变换方法Schwarz-Christoffel变换(S-C变换)及渗流力学理论,推导建立了一种新的方向渗透率半解析计算模型,编制了相应的求解程序,利用物理模拟实验验证了计算模型的准确性和实用性,并给出了相应的计算实例。该裂缝方向渗透率计算模型,不仅可以在已知裂缝渗透率和压力条件下计算相应的流量,同时还可以根据实验测得的流量和压力数据来反算裂缝渗透率,使用范围广。该计算方法为裂缝性介质渗流参数的确定提供了理论依据,对研究裂缝各向异性介质的渗流特征也具有重要的参考价值。Fractured oil reservoirs generally have one or more groups of fractures,and each group of fractures has its own relatively consistent directionality.Due to the existence of fractures,the permeability of the reservoir has anisotropic characteristics.Therefore,it was based on the polygonal conformal transformation method Schwarz-Christoffel transformation(S-C transformation)and the theoretical derivation of seepage mechanics,a new semi-analytical calculation model of directional permeability was established,and the corresponding solution program was compiled and verified by physical simulation experiments.The accuracy and practicability of the calculation model were discussed,and corresponding calculation examples were given.This fracture direction permeability calculation model could not only calculate the corresponding flow rate under the known fracture permeability and pressure conditions,but also back-calculate the fracture permeability was based on the experimentally measured flow and pressure data,and had a wide range of applications.It provided a theoretical basis for determining the seepage parameters of fractured media,and also had important reference value for studying the seepage characteristics of fractured anisotropic media.

关 键 词：裂缝方向 压力梯度 方向渗透率计算模型 裂缝渗透率 物理模拟 

分 类 号：TE319[石油与天然气工程—油气田开发工程] TE311