基于瞬时产量递减分析确定天然裂缝性油藏平均地层压力  

Application of the transient rate decline analysis for determining average reservoir pressure in naturally fractured reservoirs

作　　者：Daryasafar Amin Amareh Iman Fathi Nasab Mohammad Kharrat Riyaz Jalilian Milad 

机构地区：[1]伊朗石油科技大学石油工程学院

出　　处：《石油勘探与开发》2015年第2期229-232,共4页Petroleum Exploration and Development

摘　　要：以Warren和Root等提出的裂缝-孔隙双重介质模型为基础,拓展延伸了Mavor、Cinco-Ley和Daprat等的裂缝系统拟稳态-定产量生产的解及基质系统拟稳态-定压力生产的解,提出了根据天然裂缝性油藏定压开采的瞬时产量递减准确估算油藏平均压力的新方法。具体方法为:分别将基质产量方程和裂缝产量方程两端取自然对数,得到两条直线;再利用其斜率和截距确定弹性储容比、油藏总储容以及泄油面积,最后确定平均地层压力。经算例和实例验证,新方法简单实用,与物质平衡法和Tiab直接合成技术法得到的估算结果十分接近。Based on the fracture-pore dual medium model proposed by Warren and Root et al, the solution of the pseudosteady-constant production fractured system by Mavor and Cinco-Ley and the solution of the pseudosteady-constant pressure matrix system by Daprat are extended, and a new method is presented for estimating average reservoir pressure of naturally fractured reservoirs using the transient rate decline analysis. The specific method is taking logarithm of the matrix production equation and fracture production equation to obtain two straight lines; then the slope and intercept of the straight lines are used to determine storage capacity ratio, total storage capacity and reservoir drainage area, and average reservoir pressure at last. Examples show that the new method is easy and practical, and gives result similar to that of the material balance method and direct Tiab synthesis method.

关 键 词：天然裂缝性油藏 平均地层压力 不稳定试井 递减曲线分析 双重介质 拟稳态流动 

分 类 号：TE344[石油与天然气工程—油气田开发工程]