致密砂岩气藏水平井井控储量快速评价新方法

A New Method of Evaluating Well Controlled Reserves of Horizontal Wells in Tight Gas Sandstone Reservoirs

以苏里格气田水平井静态地质和动态生产资料为基础,通过RTA产量不稳定分析法、物质平衡原理和产能方程相结合,分析了早期投产典型水平井的生产动态,建立了水平井单井控制储量快速评价图版,并用图版评价了6口水平井的单井控制储量。结果表明,水平井单位压降采气量随生产时间的延长而增大;水平井单井控制储量与不同生产时刻的单位压降采气量均呈较好的线性关系,并且两者之间的相关性随着生产时间的延长变得越来越好;水平井单井控制储量快速评价图版具有使用简单、所需参数少、预测精度高的优点,可为致密气藏水平井单井控制储量快速评价提供一种全新的方法,同时也可为其他单井控制储量方法的评价结果提供参考,具有重要的现场应用价值。

Based on static geology and dynamic production data of horizontal wells in Sulige Gas Field,dynamic performance analysis was performed on old typical horizontal wells,using rate transient analysis by RTA type curve matching technique,combining with material balance equation and productivity formula of horizontal wells.A convenient evaluating chart of the horizontal well＇s controlled reserves was established.The chart was applied to 6horizontal wells in Suliege tight gas field.The results show that cumulative gas production per specific casing pressure drop increases with time extending and that there is a linear relationship between well controlled reserves and cumulative gas production per specific pressure drop at different production time.This correlation would become better with time extending.The established evaluating chart is simple,only requiring production data with high precision,providing a new method to evaluate well controlled reserves of horizontal wells.This chart with significant application value can also offer reference values for other evaluating methods of well controlled reserves.