各向异性油藏蛇曲井模型及产能敏感性分析

为了研究各向异性油藏中蛇曲井近井地带的渗流规律,建立了蛇曲井半解析产能预测模型,在考虑蛇曲井井型特点的基础上预测了任意井段的流入剖面和近井地带的压力分布,并针对地层不同垂向—水平渗透率、蛇曲井起伏度大小和起伏周期等产能影响因素进行了分析。结果表明:与水平井相比,蛇曲井增加了与油藏的有效接触面积;随着垂向渗透率的降低,蛇曲井可以充分弥补水平井的劣势;在一定范围内增加蛇曲井的起伏高度可使产能得到提高;蛇曲井起伏周期越多,控制面积越大,产能越高,但在综合工艺复杂性及经济成本方面存在最优起伏周期。

Analysis of model and productivity sensitivity on snaky wells in anisotropic oil reservoir

To research percolation regularities of near-wellbore zone of snaky wells in anisotropic oil reservoir, a semi-analysis productivity prediction model of snaky wells is established, pressure distribution in inflow profile and near-wellbore zone of any well section is predicted on the basis of consideration of form characteristics of snaky wells, and comparative analysis is performed for factors affecting productivity, including different vertical-horizontal permeability of stratum, fluctuation degree and period of snaky wells. Results show that: in comparison with horizontal wells, snaky wells increase effective contact area with oil reservoir; with lowering of vertical permeability, snaky wells may fully compensate for the disadvantages of horizontal wells; the increase of fluctuation height of snaky wells in certain range may improve productivity; fluctuation period of snaky wells is in direct proportion to control area and productivity, but optimal fluctuation period exists in integrated consideration of process complexity and economic cost.