Analysis of Factors Influenced on Oil Rim Breaking up During Gas Cap Development

Day 1 Tue, October 22, 2019 Pub Date : 2019-10-22 DOI:10.2118/196914-ms

D. Samolovov

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Abstract

The main goal of the present paper is to determine main factors affected on oil rim breaking up ratio during gas cap development, to construct analytical model of this process and to develop method for movable oil reserves decrease estimation based on the analytical model. Field with underlaying oil rim is considered. Gas cap development leads to reservoir pressure decrease, oil viscocity increase due to dissolved gas liberation and underlaying water expands sweeping oil from oil rim and forming immobile oil reserves behind displacement front. For volume of penetrating water estimation material balance equation is considered. Equation is solved in analytical form using linearization of main oil and gas properties deopendencies from pressure. For immobile oil reserves calculation balance equation is considered taking into account initial and residual saturations of oil, gas and water. For determine main factors affected breaking up ratio dimensional analysis is used. In the present paper main factors affected oil rim breaking up ratio is determined. There are factors characterized reservoir energetic, oil and gas reserves, relative permeability properties, ratio of gas production. During dimensional analysis count of this factors was reduced to five, this is dimensionless potential of gas cap, dimensionless potential of aquifer, dimensionless gas production, displacement efficiency of oil by water and water's redisplacement efficiency of oil sweeping gas. Also it is shown that presence of strong aquifer intensifies breaking up because expanding water forms essential volume of immobile oil reserves. Novelty of this work consists of analytical model of oil rim breaking up during gas cap development and determination of main factors affected breaking up ratio. Results can be used for estimation of gas cap development on movable oil reserves in oil rim and for estimation of oil rim development efficiency with early gas cap development.

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气顶开发过程中油环破裂影响因素分析

本文的主要目的是确定气顶开发过程中影响油环破碎比的主要因素，建立气顶开发过程中油环破碎比的分析模型，并在此分析模型的基础上建立可动储量减少量估算方法。考虑具有下垫油环的油田。气顶开发导致储层压力降低，溶解气释放导致油粘度增加，井底水膨胀，将油从油环中扫出，在驱替前缘后形成不可移动的油储量。对于渗透水量的估算，采用了物质平衡方程。利用主要油气性质与压力关系的线性化，以解析形式求解了方程。对于不动储量的计算，考虑了油、气、水初始饱和度和剩余饱和度的平衡方程。为确定影响破碎率的主要因素，采用量纲分析法。本文确定了影响油圈破碎率的主要因素。表征储层能量、油气储量、相对渗透率、产气量等因素。在量纲分析中，将这些因素的量纲数减少到5个，分别是气顶无因次潜力、含水层无因次潜力、无因次产气量、水驱油效率和水驱油气效率。强含水层的存在加剧了破裂，因为膨胀的水形成了不可移动的石油储量的必要体积。本文的新颖之处在于建立了气顶开发过程中油环破裂的分析模型，确定了影响破裂率的主要因素。研究结果可用于油环可动油储量气顶开发评价，也可用于气顶开发早期油环开发效率评价。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Day 1 Tue, October 22, 2019

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