基于分区补给物质平衡法预测致密油压裂水平井动态储量  

Determination of dynamic reserves of fractured horizontal wells in tight oil reservoirs by multi-region material balance method

作　　者：魏漪 冉启全[1,2] 李冉 袁江如[1,2] 董家辛 

机构地区：[1]国家能源致密油气研发中心 [2]中国石油勘探开发研究院

出　　处：《石油勘探与开发》2016年第3期448-455,共8页Petroleum Exploration and Development

基　　金：国家高技术研究发展计划(863计划)"致密砂岩油气藏数值模拟技术与软件(2013AA064902);中国工程院咨询研究项目"中国致密油发展战略研究"(gg-zd-2)

摘　　要：为了克服常规物质平衡法的局限,针对致密油储集层非均质性强的特点,将致密油压裂水平井的渗流区域分为高渗区和低渗区,并将其等效为径向复合渗流模型。以平行板理论为基础,将各区的多重介质等效为一种连续性介质,基于致密油多重介质的非线性渗流机理,结合积分法,提出采用两区补给物质平衡法计算致密油压裂水平井动态储量,并分区建立相应的压力分布方程和物质平衡方程。该方法结合实际生产动态规律,考虑了两类渗流区交界面处压力突变和流体交换,更符合生产实际情况。实例计算表明,应用该方法可以确定出单井控制范围内的动态储量以及不同开采时间低渗区对高渗区的补给量,为生产井产量及工作制度的确定、开发井网的部署和调整提供依据。To overcome the deficiencies of the material balance method, according to strong heterogeneity of tight oil reservoirs, the flow region of fractured horizontal well is divided into high permeable zone and low permeable zone, which are equivalent to radial composite percolation model. Based on parallel plane theory, multiple media of each zone are equivalent as a continuous medium, and with the integral method, the multi-region material balance to calculate the dynamic reserves for the fractured horizontal well of tight oil reservoirs is proposed base on the nonlinear seepage mechanism of tight oil reservoirs, and the corresponding pressure distribution equation and material balance equation for the two zones have been established. In view of the actual production performance, this method considers the pressure mutation and fluid exchange at the interface of two zones. The computational results of an example show that this method can work out the dynamic reserves within a single well control, the dynamic reserves of high permeable zone and low permeable zone, and the recharge rate from the low permeable zone to the high permeable zone in different production time accurately, which provides a basis for selection of well production and appropriate working system, and deployment and adjustment of development well pattern.

关 键 词：致密油 压裂水平井 压力分布 动态储量 分区补给 物质平衡法 

分 类 号：TE331.1[石油与天然气工程—油气田开发工程]