三重介质油藏负表皮系数水平井瞬态压力的有效算法  

An efficient calculation method of transient pressure responses of horizontal wells with negative skin factors in triple-porosity reservoirs

作　　者：王海涛[1] 李成全 张烈辉[1] 郭晶晶[1] 王宇[3] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]西南油气田分公司低效油气开发事业部,四川成都610500 [3]西南油气田分公司采气工程研究院,四川广汉618300

出　　处：《中国石油大学学报（自然科学版）》2012年第4期112-117,共6页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：中央财政支持地方高校发展专项资金“石油与天然气工程国家一级学科”项目;国家杰出青年科学基金项目(51125019);国家“973”课题(2011CB201005);国家自然科学基金项目(51104125)

摘　　要：为了更好地描述多尺度孔隙碳酸盐岩油藏的渗流特征,建立考虑多重窜流的三重介质油藏水平井不稳定试井模型,并对模型求解,绘制典型曲线。通过对水平井与直井在不稳定渗流早期流线特征的相似性分析,以及对不同表皮系数定义的正确区分,确定各表皮系数间的关系,进而引入水平井有效井径的概念。结果表明:多尺度孔隙碳酸盐岩油藏水平井开采下的渗流过程可能出现9个流动阶段;该方法与传统方法相比计算结果可靠,彻底解决了负表皮系数水平井瞬态压力计算的难题,适用范围广。In order to accurately describe the seepage flow characteristic of carbonate reservoir with multiscale pores, a model for pressure transient analysis of horizontal wells in triple-porosity reservoirs with multiple crossflow was established. The model was solved and the type curves were plotted by programming. By analyzing the flow streamlines＇ characteristics of hori- zontal wells and vertical wells in early stage of non-stationary flow, the similarities of the two kinds of models were found, and different skin factors were defined. Based on this, the relations among different skin factors were developed and the effective well radius of horizontal well was introduced. The results show that there are nine flow periods of the seepage flow of horizon- tal wells in carbonate reservoirs with multiscale pores. The comparison of the solutions from both the traditional and the pro- posed method indicates that the proposed method is correct and more applicable, and the problem of transient pressure responses of horizontal wells with negative skin factors is solved.

关 键 词：三重介质油藏 水平井 瞬时压力分析 负表皮系数 

分 类 号：TE353[石油与天然气工程—油气田开发工程]