水驱油藏剩余油再富集成藏机理
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杨勇(1971—),男,河南遂平人,教授级高级工程师,博士,从事油气田开发研究及管理工作。联系电话:(0546)8533696,Email:yangyong.slyt@sinopec.com。

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国家科技重大专项“断块油田特高含水期提高水驱采收率技术”(2011ZX05011-003)。


Reservoir forming mechanism of remaining oil re-enrichment in water flooding reservoir
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    摘要:

    中国老油田已陆续进入开发中后期,大量剩余油受储层强非均质性的影响而滞留于地下,成为实现老油田稳产的重要物质基础。高含水条件下剩余油潜力区预测是一项高度综合性的研究难题,对其相关领域的理论与实践研究一直在持续发展,但对剩余油富集机制的研究却涉及较少,而油水渗流规律研究是低渗透油藏水驱开发的关键。为此,针对贝克莱-列维尔特驱油理论未考虑油水重率差和毛管压力的问题,基于流体势原理和油气运移成藏理论,考虑水湿油藏水包油和油包水2种状态,从油藏流体受力分析入手,运用达西定律首次推导出水驱油藏流体运移过程中的渗流速度、剩余油再富集成藏速度公式,明确了水驱油藏不同开发阶段剩余油再富集成藏机理。研究结果表明,水动力存在与否对水驱油藏剩余油再富集成藏速度具有较大影响,且剩余油再富集成藏速度随着空气渗透率、含水饱和度和油水密度差的增加而增大,随着水动力压力梯度、原油粘度和地层倾角的增加而减小。矿场试验证实,水驱油藏剩余油再富集成藏机理是合理、实用的。

    Abstract:

    Old oilfields in China have successively entered into middle to late stage of oil production. Affected by strong reservoir heterogeneity,large amounts of remaining oils are still in the subsurface and provide an important material foundation for a long-term stable yield in old oilfields. It is a highly integrated and difficult research problem to predict potential areas of remaining oil under high water cut condition. The theoretical and practical prediction have never ceased but with fewer researches on enrichment mechanism of remaining oils. Research on oil-water flow rule is the key of water flooding in the low-permeability reservoirs. Oil-water rate difference and capillary force is not considered in Buckley-Leverett principle. Based on the theory of fluid potential energy and petroleum migration and accumulation,the formulae of oil-water seepage velocity and reservoir forming velocity of remaining oil re-enrichment in the whole fluid migration course of water flooding were deduced first in consideration of two states,oil in water and water in oil,in water-wet reservoir by means of force analysis using Darcy’s Law. The reservoir forming mechanism of remaining oil re-enrichment at different develop? ment stages in the water flooding reservoir was proposed. The research results show that the hydrodynamic force has a big impact on the remaining oil re-enrichment velocity in water flooding reservoir,and the remaining oil re-enrichment velocity increases with the increase of air permeability,water saturation and oil-water density difference,and it decreases with the increase of hydrodynamic pressure gradient,crude oil viscosity and dip angle. The field application indicates that the mechanism of remaining oil re-enrichment in the water flooding reservoir is reasonable and practical.

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杨勇,胡罡,田选华.水驱油藏剩余油再富集成藏机理[J].油气地质与采收率,2015,22(4):79~86

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  • 在线发布日期: 2015-07-22