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Modeling Gas Condensate Well Productivity in Consideration of Trapped Phases

机译：考虑到捕获的阶段，建模气体凝结良好的生产率

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This paper is devoted to the providing more accurate modeling of the hydrodynamic processes in the gas condensate reservoirs and investigates the influence of near-wellbore region on the gas condensate well deliverability. For increasing of accuracy it was used Forchhamer's equation as filtration law. As opposed to Darcy law this equation simulates properties of flow at high Reynolds numbers that typical to gas condensate reservoir. As the nonlinearity coefficients in Forchheimer equation were taken functions of porosity and permeability, proposed by different authors. In addition, there were simulated such effects as the capillary trapping of phases, the formation compressibility and the mudding of the near-wellbore area. The capillary trapping effect was simulated by empirical dependence of the residual saturation as function of the capillary number. Residual saturations were arguments of the function of relative phase permeability. The studies showed that the difference in productivity of wells can overcome 50 per cent in case of using in numerical model the nonlinearity coefficients proposed by various authors. The importance of modeling the capillary trapping effects was corroborated. An essential nonadditivity of considered factors affecting the productivity of wells was shown. It was found that a depression increase in hydrophobic reservoirs leads to a greater relative increase of well deliverability in contrast to hydrophilic reserviors. Furthermore, in the research was simulated the change of the wettability in parts of borehole area from hydrophobic state to hydrophilic and vice versa. It was shown that well deliverability as function of a radius of area with modified wettability has extrema. From the analysis of the data obtained it was concluded that the changes of wettability in near-wellbore area can improve well deliverability, but the optimum size of the area with modified wettability depends on the presence in the formation of capillary trapped water. Thus, radius of the area with modified wettability may be optimal for one configuration of the trapped water or lead to a decrease of deliverability in other cases. Such effect should be considered during attempts to increase deliverability by modifying type of near-wellbore area in terms of wettability of the formation.
机译：本文致专用于提供气体冷凝水储层中的流体动力学过程的更准确的建模，并研究了近井眼区对气体冷凝物井可递送性的影响。为了提高准确性，它被用作过滤法的灰粉。与达西法相反，该等式模拟典型的气体冷凝水储层的高雷诺数的流动性质。由于Forchheimer方程中的非线性系数被采用不同作者提出的孔隙率和渗透性的函数。此外，模拟诸如近井筒区域的毛细血管捕获，形成可压缩性和浑浊区域的糊状效果。通过作为毛细数量的功能的残余饱和度的经验依赖性模拟毛细血管捕获效果。残留饱和是相对相渗透性的函数的争论。该研究表明，如果在数值模型中使用各作者提出的非线性系数，则井的生产率的差异可以克服50％。建模毛细血管捕获效果的重要性得到了证实。显示了影响井的生产率的考虑因素的基本非addity。发现疏水储层的凹陷增加导致与亲水储存相比的良好递送性的更大相对升高。此外，在研究中，模拟了从疏水状态的钻孔面积的部分润湿性的变化，从疏水状态到亲水，反之亦然。结果表明，作为具有改进润湿性的区域的函数的良好可传递性具有极值。根据所获得的数据的分析，得出结论是，近井眼区域的润湿性的变化可以提高良好的可递送性，但是具有改性润湿性的区域的最佳尺寸取决于毛细血管捕获的水中的形成。因此，具有改进的润湿性的区域的半径可以是捕获的水的一种配置的最佳状态，或者在其他情况下导致可递送性降低。在尝试期间应考虑这种效果，以通过在地层的润湿性方面通过改变近井筒区域的类型来增加可交换性。

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