双重介质气藏不稳态产能变化特征研究  

VARIATION CHARACTERISTICS OF UNSTEADY-STATE PRODUCTIVITY IN DUAL-MEDIA GAS RESERVOIR

作　　者：杨济源[1] 张小涛[1] 王蜀源 王川杰[3] 周峰[3] 

机构地区：[1]中国石油西南油气田公司勘探开发研究院 [2]中国石油西南油气田公司法律与股权处 [3]中国石油西南油气田公司蜀南气矿

出　　处：《天然气勘探与开发》2013年第3期50-53,57,共5页Natural Gas Exploration and Development

摘　　要：稳定试井是对气井进行产能分析的重要手段,通常采用回压试井和等时或修正等时试井,这两种试井方法都需要较长的时间,而实际的气体渗流都是不稳定的,流量和压力也会随时间发生变化,因此研究不稳态的产能变化特征更为合理。首先针对双重介质气藏渗透率具有方向性的特点,考虑在椭圆坐标系中建立气体渗流微分方程,进而对求解该渗流微分方程所要用到的马丢函数进行数值计算,从而可以求出双重介质气藏的不稳态产能表达式,最后绘制不稳态产能曲线,并讨论双重介质气藏的不稳态产能,表皮系数、各向异性、弹性储容比等参数的变化对不稳态产能曲线的影响。For gas wells,stable well testing is the critical tool to analyze productivity.And two methods are very common,backpressure well testing and isochronal or modified isochronal well testing.However,some problems accompany with these two methods,such as time consuming,unstable real gas seepage flow,and flow rate and pressure changing with time.So,to study the variation characteristics of unsteady-state productivity is even more important.As we known,permeability in dual-media gas reservoir is directional.Therefore,at first,a differential equation of gas seepage flow should be established in elliptic coordinates;and then Mathieu function which is used for the equation is calculated;finally,an expression and a curve for unsteady-state productivity are obtained and mapped out.In addition,the effects of skin-factor,anisotropy,and elastic-storativity-ratio variations on unsteady-state productivity curve are discussed.

关 键 词：双重介质气藏 不稳态产能 椭圆渗流 马丢函数 

分 类 号：P618.13[天文地球—矿床学]