枯竭油气藏储气库试注氮气评价注气能力方法  

Evaluation of gas injection capacity of depleted oil-gas reservoirs by nitrogen injection test in gas storage

作　　者：徐凤兰 刘述忍 李琳琳 鹿晓涵 陈燕 王永军 XU Fenglan;LIU Shuren;LI Linlin;LU Xiaohan;CHEN Yan;WANG Yongjun(Well Testing Branch,CNPC Bohai Drilling Engineering Co.,Ltd.,Langfang,Hebei 065007,China)

机构地区：[1]中国石油集团渤海钻探工程有限公司油气井测试分公司,河北廊坊065007

出　　处：《油气井测试》2021年第4期7-12,共6页Well Testing

基　　金：中国石油集团渤海钻探工程有限公司课题“温吉桑储气库群注采能力及井间连通性研究”(2020D42F)。

摘　　要：针对枯竭油气藏储气库没有足够天然气进行试注试验的情况,提供一种利用试注氮气评价储气库注天然气能力的方法。该方法在储气库预可行性研究阶段进行注氮气产能试井,得到日注入量与注入压力随时间的变化曲线,再将氮气日注入量转换为天然气日注入量,求取注气产能方程,绘制IPR曲线,通过节点分析法联合OPR曲线确定不同地层压力下的最佳注入量。温吉桑储气库X井应用表明,采用88.9 mm油管注气时,实际注气能力是设计值的1.11倍,优于预可行性研究结果。该方法为储气库注气工作制度的确定和注气管柱设计提供了科学依据。This paper provides a method to evaluate the natural gas injection capability of gas storage by trial injection of nitrogen when there are no adequate gas of depleted oil-gas reservoirs.In this method,the nitrogen injection productivity test is carried out in the pre feasibility study stage of gas storage,and the curve showing the daily injection volume and the injection pressure changing with time is obtained.Then the daily nitrogen injection volume is converted into daily natural gas injection volume to calculate the gas injection productivity equation,and then the IPR curve is drawn.With node analysis method,combining the IPR curve with the OPR curve,the optimal injection volume under different formation pressure shall be determined.The application in Well X of Wenjisang Gas Storage shows that in case the 88.9 mm tubing is used for gas injection,the actual gas injection capacity is 1.11 times as much as the design value,which is better than the results of the pre-feasibility study.This method provides a scientific basis for the determination of the gas injection working system of the gas storage and the design of the gas injection pipe string.

关 键 词：枯竭油气藏 天然气 氮气 储气库 注气能力 系统试井 节点分析法 工作制度 

分 类 号：TE377[石油与天然气工程—油气田开发工程]