王洼子油区延10油层特征及产量预测

Characteristics and Production Prediction of Yan-10 Oil Layer in Wangwazi Oilfield

为了搞清王洼子油区延10油层组在生产过程中的递减规律,利用图解法和一种新型的衰减方法对4口典型井进行产量递减分析,确定产量递减类型及产量预测方程,开展产量递减规律分析。研究表明:①油层为中孔、低渗储层(平均孔隙度为17.3%、平均渗透率为16.23 mD),孔隙喉道以细孔隙—中喉道为主(平均吼道直径为2.82μm,平均孔隙直径为4.04μm),油藏类型为岩性—构造油藏,为低渗透、特低渗透油田;②确定出的4口典型井的产量递减方程,得出了产量指数递减类型,预测累计产量最大相对误差为7.6%,最小的相对误差为0.03%。以上成果认识,对该区域中长期产量预测、可采储量标定以及今后开发方案的调整有重要的意义。

In order to find out the decline law of Yan-10 oil layer group in Wangwazi oil area in the production process, this paper analyzed the production decrease of four typical wells by utilizing the graphic method and a new type of attenuation method, and defined the production decline type and production prediction equation, and carried out the production decline law analysis. The research shows that: ①The oil layer is middle-porosity and low permeability reservoir(average porosity: 17.3%, average permeability: 16.23 mD). The pore throat is dominated by fine pore-middle throat(average pore throat diameter: 2.82 μm, average pore diameter: 4.04 μm). It is a a low permeability and ultra-low permeability oilfield whose reservoir belongs to lithologic-structural type. ②The yield decline equations of the four typical wells were defined, and the type of production index decline was obtained. The maximum relative error of cumulative production was predicted to 7.6%, and the minimum relative error was predicted to 0.03%. The above results make great significance to the medium and long-term production prediction, the recoverable reserves’ calibration and the future development plans’ adjustment in the region.