岩心渗透率的精确计算方法及其适用范围实验研究
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摘要
通过对非达西二项式渗流方程推导,建立了计算高速非达西渗透率的方法,并结合400块岩心的气体单相渗流实验结果,明确了不同渗透率计算方法的适用范围:储层渗透率小于10×10-3μm2时,滑脱效应对气体渗流产生了较大影响,应进行克氏渗透率校正计算;大于50×10-3μm2时,高速非达西渗流对气体渗流产生了较大影响,达西定律不再适用,应采用高速非达西渗透率的计算方法;介于(10~50)×10-3μm2时,需要同时考虑两种渗流规律的影响而采用复合计算方法。经与岩心分析资料对比,用此计算方法得到的渗透率值更加接近实际地层情况。
For high permeability reservoirs in which there is usually non-Darcy flow,a new permeability calculation method is established based on binomial equation of non-Darcy flow. The application scopes of different permeability calculation methods are confirmed according to the gas seepage experiments of 400 cores. The results show that when the permeability of reservoirs is lower than10 × 10- 3μm2,slippage effect has serious influence on the gas seepage,so the correction calculation method of Klinkenberg permeability should be used. When the permeability is higher than 50 × 10- 3μm2,high-speed non-Darcy flow has serious influence on the gas seepage,so high-speed non-Darcy permeability calculation method should be used. When the permeability is in the range of( 10 ~ 50) ×10- 3μm2,there are both the slippage effect and high-speed non-Darcy seepage,so a composite calculation method should be used.Compared with core analysis data,the permeability calculation model mentioned in this paper is very close to actual formation conditions and it can be used to evaluate the reserve-production characteristics of reservoirs.
引文
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