摘要
大量矿场试验和室内实验研究表明,某些低渗砂岩气藏在开采过程中会存在渗透率压敏效应,增强了气体渗流的阻力,对气藏生产具有一定负面影响。通过定义一种新的压敏拟压力函数,在求解方法上采用褶积法和数值正反演对扩散系数项进行处理,从而得到气体非线性方程的产量变化解析解;并绘制了不同渗透率模量的产量递减曲线。最后通过一个气藏实例说明了渗透率压敏性对产量递减曲线的影响,并求取了气藏原始渗透率。
It is shown by a large number of experiments that there exists an obvious reduction in permeability during the development of low-permeable sandstone gas reservoirs, which increases the non-linearity of governing equations and has certain negative influence on the gas reservoir development. A new stress-sensitive pseudo-pres- sure for gas reservoirs is defined. A new convolution algorithm and numerical inversion are adopted to deal with the diffusivity term and then rate response is successfully obtained and different permeability modulus of production decline curve are drawn. Finally, an example shows the influence of stress-sensitive on production decline curve and the initial permeability of the gas reservoir is got.
出处
《科学技术与工程》
北大核心
2014年第31期46-50,共5页
Science Technology and Engineering
基金
国家重大科技专项(2011ZX05009-004)资助
关键词
气藏
压敏效应
褶积
数值正演
产量递减曲线
gas reservoirdecline curvesstress-sensitive convolution algorithm numerical inversionproduction
