低渗透油藏气驱“油墙”物理性质描述

发布时间：2018-02-25 15:26

本文关键词： 低渗透油藏气驱油墙物理性质描述方法　出处：《科学技术与工程》2017年01期 　论文类型：期刊论文

【摘要】：搞清地层流体物理性质是科学管理油藏的重要前提,注气开发也不例外。基于简化实际气驱过程的"三步近似法"、物质平衡原理和相态基本原理等概念,将"差异化运移"和"加速凝析加积"两种气驱"油墙"形成机制与挥发油藏和凝析气藏开发实际经验和相态实验评价方法相结合,首次得到见气见效阶段"油墙"的溶解气油比、泡点压力、密度、地下黏度和体积系数等关键物性参数计算方法。用于国内多个二氧化碳驱开发试验项目呈现了很好的适应性,发现混相/近混相CO_2驱"油墙"泡点压力比原状地层油的泡点压力约高4.0~6.0 MPa,溶解气油比要比地层原油升高40~60 m~3/m~3;为注气开发油藏见气见效后油墙集中采出阶段生产井工作制度确定和采油工艺优化提供了主要理论依据。
[Abstract]:Understanding the physical properties of formation fluid is an important prerequisite for scientific reservoir management, and gas injection development is no exception. Based on the concepts of "three-step approximation", material balance principle and basic principle of phase state, which simplify the actual gas drive process, The formation mechanism of "oil wall" of "differential migration" and "accelerated condensate accumulation" is combined with the practical experience in the development of volatile oil reservoirs and condensate gas reservoirs and the method of phase state experimental evaluation. For the first time, the calculation methods of key physical parameters, such as dissolved gas-oil ratio, bubble point pressure, density, underground viscosity and volume coefficient, are obtained. It is found that the "oil wall" bubble point pressure of miscible / near-miscible CO_2 flooding is about 4.0 ~ 6.0 MPa higher than that of undisturbed formation oil, and the dissolved gas / oil ratio is 4060 m ~ (3) / m ~ (-3) higher than that of formation crude oil. The determination of well working system and the optimization of oil production process provide the main theoretical basis.
【作者单位】：提高石油采收率国家重点实验室(中国石油勘探开发研究院);国家能源CO_2驱油与埋存研发(实验)中心;中国石油吉林油田分公司;中国石油冀东油田分公司;
【基金】：“973”计划(2011CB707302) 中国石油天然气股份有限公司专项(2014E3606)资助
【分类号】：TE357.44

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