缝洞型油藏的离散缝洞网络流动数学模型.PDFVIP

3 1 　 5 V ol.3 1 No.5 　 　 2 010 9 ACTA PET ROLEI SINICA Sept. 2 010 :0253-2697 (2 010)05-0 815-0 5 姚　军　黄朝琴　王子胜 　李亚军　王晨晨 (　　266555) :针对现有油藏渗流理论在描述缝洞型油藏流动机理上存在的困难, 基于缝洞型油藏储层的特点, 提出 离散缝洞网络流动 数学模型。 该模型将缝洞型油藏划分为岩块系统、裂缝系统和溶洞系统;其中裂缝和溶洞嵌套于岩块中, 并相互连接成网络;岩块 和裂缝系统视为渗流区域, 溶洞系统视为自由流动区域。 阐述 模型的基本原理, 推导 相应的有限元数值计算格式, 通过算例验 证 其正确性。 算例分析结果表明, 离散缝洞网络流动数学模型能够正确地描述出缝洞型油藏的流动特征。 :缝洞型油藏;离散缝洞网络;自由流动;耦合流动;有限元数值计算 :T E3 44 　　　　:A Mathematical model of fluid flow in fractured vuggy reservoirs based on discrete fracture-vug network YAO un 　H UANG Zhaoqin 　WANG Zisheng 　LI Yajun 　WANG Chenchen (School of Petroleum Engineering , China University of Petroleum, Qingdao 2 66 55 5, China) Abstract:T he current percolatio n theory is difficult to describe the fluid flow mechanism in natur ally f ractured v uggy reservoir s.A new mathematical model, namely discrete fracture-v ug netw ork model, w as pr oposed to solve the problem.T he fr actured vuggy res- ervoir wa s divided into three sy stem s in the new model, including the porous r ock system, fr acture system and v ug sy stem.T he frac- ture s and vugs were supposed to be embedded in the por ous ro ck, and the isolated v ug s w ere co nnected via discrete f racture netw ork. T he fluid flow in por ous rock and fr acture s follow ed the Dar cy Law .T he ro ck fractures w ere taken as seepag e area, and the v ug s sy stem was the free fluid flow r egio n.T he principles of the mathematical model were discussed.T he correspo nding finite element numerical formulas wer e propo sed.T he numerical computatio n results show ed that the discrete f racture-vug network model could provide a natural way for modeling the r