摘要
厚油层存在明显的韵律性,隔夹层的存在,增加了开采指标预测的难度。从渗流力学基本原理出发,推导了厚油层内夹层对垂向渗流控制作用的数学公式——层间传导率校正系数的函数表达式,量化了夹层参数与厚油层垂向流动能力之间的内在关系,以及对水驱采收率的影响规律。研究了不同夹层类型,包括泥岩、砂质泥岩、泥质砂岩,及其发育厚度对开发指标的影响。研究结果表明,油藏采用逐层上返方式开采时,泥岩夹层所起的遮挡作用越强,防止层间窜流的效果越好;砂泥岩夹层次之,其对层间油水运移的遮挡作用受到厚度的限制;泥质砂岩夹层最差,已经不适合采用逐层上返开采,建议采用传统方式开采。研究结果对量化认识厚油层夹层的作用,准确预测采收率具有指导意义。
There is obvious rhythmicity in thick reservoirs,therefore,it becomes more difficult in forecasting the development index when interlayer exists in thick reservoirs.The functional relation of layer-to-layer conductivity correction factor is derived based on the fundamental principle of fluid flowing through porous media.It not only quantifies the intrinsic relationship between interlayer parameters and vertical flow capacity of thick reservoir,but also quantifies the influencing law of water flooding recovery factor.The influence of different type and thickness of interlayer on the development index is studied.The findings indicate that the degree and effectiveness of keeping out liquids crossing flow between oil layers for different type barriers are different during zone by zone up-going production,the mudstone is the best,the second is sandy shale in which,the effect of keeping out liquids crossing flow between oil layers is limited by thickness,the last is shaly sand,in which,zone by zone up-going production is already not a applicable development mode,therefore,commingled production is proposed.The research result offers a guideline to correctly understand the influence of interlayer on thick reservoir.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第4期103-106,共4页
Journal of Southwest Petroleum University(Science & Technology Edition)
关键词
厚油层
夹层
采收率
层间传导率
逐层上返
thick reservoir
interlayer
recovery
layer-to-layer conductivity
zone by zone up-going production
