低渗透油田考虑启动压力梯度计算井网产量

针对低渗透、低丰度油层难以有效开发动用的难题，采用基于非达西渗流条件下的不同井网产量计算模型，作为低渗透油田井网优化设计方法。将动用系数作为衡量低渗透储层动用程度的指标，为井网优化设计提供参考。以某低渗透油田区块为例，结合启动压力梯度，考察了井距、注采压差与油井产量和动用系数之间的关系。研究结果表明，低渗透油田启动压力梯度的存在，井距越大，克服启动压力所消耗的压力越多，动用系数越低，在某低渗透油田区块目前300m井距下无法建立有效的驱动体系，需要减小井距。

THE PRODUCTIVITY CALCULATION FOR WELL PATTERN OF LOW PERMEABILITY RESERVOIR CONSIDERING THRESHOLD PRESSURE GRADIENT

In view of the issue on the low permeable and low abundance reservoirs being difficult to develop,the deliverability calculation model of different well pattern under the condition of non-Darcy flow law is used to the optimal design of well pattern in low permeable reservoirs.The producing index is taken as the indicator evaluating the producing degree of low permeable reservoir and to provide reference for optimal well pattern design.A certain low permeable reservoir is taken as example,combining with threshold pressure gradient,the relationship among the well pattern,the pressure different between production and injection,deliverability and producing coefficient.Results show because of the existence of threshold pressure gradient in low permeable reservoir,the greater the well spacing is,the more the pressure depleted in overcoming threshold pressure is required and smaller the producing coefficient is.In that reservoir,effective flooding system can not be established under the current condition of 300m well spacing,so the spacing should be shortened.