摘要
采收率研究是制订开发方案及方案调整的重要内容,现有的采收率标定方法大多根据开发经验获得,缺乏理论依据。通过联立水驱气藏物质平衡方程和水侵量计算方程,结合端点方程建立了水驱气藏最终采收率的理论计算方法。结合气藏和水体的基本性质参数,编制程序并绘制无量纲拟压力和采出程度的关系曲线来确定水驱气藏的最终采收率,并定量分析其主要影响因素。研究结果表明,水驱气藏最终采收率随初始地层压力、水层渗透率、水体大小和残余气饱和度的增大而减小,随气藏生产速度和最终体积波及系数的增大而增大,且影响水驱气藏最终采收率重要的可控因素是气藏生产速度。研究成果既能直观认识各种因素对最终采收率的影响程度,又为合理制订气藏开发技术对策提供依据。
The study of recovery is an important research content of making and adjusting development program, but the existing recovery calibration methods are mostly obtained based on the field development experience, lack of theoretical ba- sis. In this paper, through combining the endpoint equation and the simultaneous solution of material balance equation and water influx calculation equation of water drive gas reservoir, the theoretical calculation method of water drive gas reservoir ultimate recovery is established. With the proposed recovery calculation method in this paper, combining with the basic properties of the gas reservoir and aquifer, the software programming and the relationship curve of dimensionless pseudopre- ssure and recovery degree are made by Matlab software to compute the ultimate recovery of water drive gas reservoir, so as to quantificationally analyze its main influencing factors. The study results show that the recovery of water drive gas reser- voir will decrease with the increase of initial formation pressure, aquifer permeability, aquifer size and residual gas satura- tion; and will increase with the increase of production speed of gas reservoir and ultimate volumetric sweep efficiency; in addition, we also found that the important controllable factor influencing the recovery of water drive gas reservoir is the pro- duction speed of gas reservoir. Using the recovery calculation method presented in this paper, the influence degree of vari- ous factors on the ultimate recovery can be acquainted, thus helping us to work out reasonable technical measures of gas reservoir exploitation.
出处
《非常规油气》
2015年第1期35-40,共6页
Unconventional Oil & Gas
关键词
水驱气藏
物质平衡方程
水侵量
采收率计算方法
影响因素
water drive gas reservoir, material balance equation, water influx, recovery calculation method, influencing factors
