摘要
为了解决由于水侵量未知导致水驱气藏储量计算困难的问题,基于气藏压力下降引起水体压力下降、水体孔隙收缩和水体中水的弹性膨胀导致水侵的机理,应用物质平衡原理,推导出了水侵量计算模型,建立了水驱气藏动态储量和水侵量计算新方法,该方法可同时计算出气藏的动态储量和水侵量。在此基础上,应用理论数值模型和实例验证了本文方法的可靠性。最后将本文方法应用于番禺某气田3口井的动态储量和水侵量预测。研究结果表明:①水驱气藏综合产出流体地下体积与综合弹性能的指示曲线为过原点的一条直线,直线的斜率就是动态储量的数值;②水侵量可以通过拟合过程中确定的水体倍数进行计算;③建立的方法也可用于判断天然气弹性能、气藏岩石和孔隙水弹性膨胀能、水体能量(包括水体岩石和水体孔隙水的弹性膨胀能)在整个驱动能量中的占比的变化,评价水驱气藏水侵能量强弱,为气藏防水治水措施提供依据。
In order to solve the problem that the reserves of water drive gas reservoir are difficult to be calculated due to the unknown water influx,based on the mechanism of water invasion caused by the pressure decrease,the pore shrinkage and the water elastic expansion in aquifers with the pressure decrease of gas reservoir,a calculation model of water influx is derived by using the principle of material balance,and a new method for calculating dynamic reserves and water influx of water drive gas reservoirs is established.By using this new method,the dynami c reserves and water influx of gas reservoirs can be calculated at the same time.Besides,the reliability of the method is verified by theoretical numerical models and actual cases.Finally,the method is applied to the prediction of dynamic reserves and water influx of three wells in a gas field in Panyu.The results show that:①for water drive gas reservoirs,the index curve of total produced fluids underground volume and comprehensive elastic energy is a straight line through the origin,and the slope of the line represents the dynamic reserves;②the water influx can be calculated by the determined ratio of aquifer volume to reservoir volume in data fitting process;③the established method can also be used to judge the proportion change of natural gas elastic energy,water elastic expansion energy in gas reservoir rocks and pores,and aquifer energy(including the water elastic expansion energy in aquifer rocks and pores)to the whole drive energies,so as to evaluate the water invasion energy in water drive gas reservoirs,and provide basis for water prevention and control measures of gas reservoirs.
作者
闫正和
石军太
秦峰
洪舒娜
白美丽
YAN Zhenghe;SHI Juntai;QIN Feng;HONG Shuna;BAI Meili(CNOOC Deepwater Development Limited,Zhuhai,Guangdong 518000,China;State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum,Beijing 102249,China;MOE Key Laboratory of Petroleum Engineering(China University of Petroleum),Beijing 102249,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2021年第1期93-103,共11页
China Offshore Oil and Gas
基金
中国海洋石油集团有限公司重大科技专项“南海东部油田上产2000万吨关键技术研究(编号:CNOOC-KJ 135 ZDXM 37 SZ)”部分研究成果。
关键词
水驱气藏
动态储量
水侵量
水体
物质平衡
驱动能量
water drive gas reservoir
dynamic reserves
water influx
aquifer
material balance
drive energy
