一种气顶底水油藏平均地层压力计算新方法  

A new method for calculating average formation pressure of gas cap and bottom water reservoirs

作　　者：朱丽娜 张艺钟 张茂林[1,2] 杨龙 庞朝峰[1] 凡文科[3] 黄晓慧 ZHU Lina;ZHANG Yizhong;ZHANG Maolin;YANG Long;PANG Chaofeng;FAN Wenke;HUANG Xiaohui(School of Petroleum Engineering,Yangtze University,Wuhan City,Hubei Province,430100,China;Hubei Collaborative Innovation Center for Unconventional Oil and Gas,Yangtze University,Wuhan City,Hubei Province,430100,China;Sixth Oil Production Plant,Daqing Oilfield Company Limited,Daqing City,Heilongjiang Province,163114,China)

机构地区：[1]长江大学石油工程学院,湖北武汉430100 [2]长江大学非常规油气湖北省协同创新中心,湖北武汉430100 [3]中国石油大庆油田有限责任公司第六采油厂,黑龙江大庆163114

出　　处：《油气地质与采收率》2023年第5期139-146,共8页Petroleum Geology and Recovery Efficiency

基　　金：国家自然科学基金青年基金项目“考虑地层水与储层多孔介质的页岩气藏多组分吸附相态行为研究”(52004032)。

摘　　要：平均地层压力作为油气藏开发的一项重要指标,是油气藏产能分析与动态评价的基础,反映了油气藏开发过程中的动态特征。常规关井测量平均地层压力的方式会影响生产,且效率较低,因此,如何方便快捷地获取油藏随生产变化的平均地层压力对于整个油藏来说具有十分重要的意义。由于气顶底水油藏底部与强水体相连,常规计算平均地层压力的方法没有考虑到水侵量的侵入,因此该方法对于气顶底水油藏来说不再适用。考虑到气顶底水油藏的特点,研究提出一种新的水侵量计算方法,即拟合亏空体积法预测水侵量,并将其与物质平衡法相结合,建立平均地层压力的函数,通过求解此函数,获取生产过程中的平均地层压力。与数值模拟结果对比表明:该方法计算所得平均地层压力与数值模拟之间相对偏差较小,仅为0.054%。该方法无需关井,不影响生产,仅需要较容易获取的动静态资料,便于应用且准确性较高,能够经济高效地获取平均地层压力,根据平均地层压力可以计算出油藏的驱动指数以及分相采出程度,为油藏后续的开发提供重要依据。The average formation pressure is a significant indicator of reservoir development and the foundation for reservoir capacity analysis and dynamic evaluation,which reflects the dynamic aspects of the reservoir development process.However,the conventional shut-in method of measuring the average formation pressure affects production and is inefficient.Therefore,how to obtain the average formation pressure changing with the reservoir production conveniently and quickly is of great significance for the whole reservoir.The conventional method of calculating the average formation pressure does not consider the water influx because the reservoir bottoms with both gas cap and bottom water are connected to the strong water body.Thus,this method is no longer suitable for the reservoirs with gas cap and bottom water.Considering the characteristics of the reservoirs with gas cap and bottom water,this study proposes a new water influx calculation method,namely the fitting deficit volume method to predict water intrusion,which is combined with the material balance method and the function of average formation pressure is established.By solving this function,the average formation pressure in the production process can be obtained.The comparison with the numerical simulation results shows that the relative deviation between the average formation pressure calculated by this method and the numerical simulation is small,only 0.054%.The findings demonstrate that the method does not require a shut-in of the wells,has no effects on production,and just calls for readily available dynamic and static information.It is simple to use and has a high degree of accuracy.It can be concluded that the method can obtain the average formation pressure economically and efficiently.Based on the average formation pressure,the drive index of the reservoir and the phase recovery can be calculated,which provides an important basis for the subsequent development of the reservoir.

关 键 词：平均地层压力 气顶底水油藏 物质平衡 数值模拟 水侵量 

分 类 号：TE349[石油与天然气工程—油气田开发工程]