特低渗透油藏平面渗流规律研究

2D Seepage Flow Rule of the Ultra-low Permeability Reservoir

为研究特低渗透油藏平面渗流规律,采用特低渗透砂岩露头平板模型进行了单相流体驱替实验。用相似原理建立了与实际油田五点法井网相似的四分之一单元,采用稳态法测定了平板模型在不同注采压差下出水口的产量。根据推导出的实验注采系统的产能公式,反算了平板模型的视渗透率。对特低渗透砂岩露头平板模型的平面渗流规律进行了分析讨论。发现平板模型单相驱替实验中也存在非线性渗流现象。并且渗透率越低,非线性渗流现象越明显。

To study the 2D seepage flow rule of the ultra-low permeability reservoir, the ultra-low permeability sandstone outcrop plate model is used to perform the single-phase fluid displacement experiment. One-fourth unit similar with the actual oil field five points well pattern was established using the theory of similarity. The outlet pro- duction of the plate model in different injection-production pressure differential was measured using the steady state method. According to the productivity formula of the experimental injection-production system which was deduced by ourselves we back calculated the apparent permeability of the plate model, and then the 2D seepage flow rule of fluid in the ultra-low permeability sandstone outcrop plate model was analyzed and discussed. Finally it find out that there is also the non-Darcy flow phenomenon in the single-phase fluid displacement experiment of the 2D plate mod- el, and with the permeability of the experimental model becoming lower, the non-Darcy flow phenomenon becoming more obvious.