封闭定容型缝洞单元注水替油开采规律

Law of water injector production in fractured-vuggy unit with enclosed boundary and constant volume

封闭定容型缝洞单元注水替油开采规律对合理开发该类缝洞单元具有重要指导意义。针对封闭定容型缝洞单元注水替油开采特点,采用物理模拟方法,研究了不同充填程度下注水替油周期产油量的变化规律;在确定相关参数的基础上,通过推导压缩系数,计算得到了周期产油量,并结合物理模拟实验,验证了数值计算方法的正确性;进一步研究了生产压差、充填颗粒粒径、充填程度对周期产油量的影响。结果表明:随着注水替油的进行,周期产油量逐渐降低;周期产油量随着注水替油生产压差的增大、溶洞充填颗粒粒径的增大、溶洞充填程度的降低而提高;生产周期数量随着注水替油生产压差的增大、溶洞充填颗粒粒径的减小、溶洞充填程度的增大而减少。

It is of important significance to study the law of water injector production in fractured-vuggy unit with enclosed boundary and constant volume for developing this kind of fractured-vuggy unit.In this paper,based on the characters of water injector production in fractured-vuggy unit with enclosed boundary and constant volume,the law of cycle production changes at different filling degree has been studied by physical simulation.Based on determining the relevant parameter,the law of cycle production changes has been calculated by deducing the formula of compressibility factor.The comparison between physical simulation results and numerical computation results has proved the validity of numerical computation.Furthermore,the effect of producing pressure drop,filling size and filling degree on cycle production has been studied.The results show that cycle production decreased gradually with the water injector production going on.Cycle production increased with decreasing filling degree and increasing producing pressure drop and increasing filling size.The number of production cycle decreased with increasing filling degree and increasing producing pressure drop and decreasing filling size.