基于油水分流原理的密闭取心饱和度校正方法

为力求准确求取密闭取心井油水饱和度,在分析流体饱和度损失变化的主要影响因素的基础上,以覆压岩石孔渗压缩校正为基础,以油水相渗分流率计算原理为核心,建立了密闭取心井由于孔隙及油水体积变化和降压脱气排液造成流体饱和度损失变化的数学校正模型。为油层损失前真实油水饱和度的校正提高了可靠的依据,具有重要的理论和实用意义。

Sealed Coring Saturation CorrectionMethod Based on Oil-Water Diffluence Principles

The use of sealed coring wells to analyze oil-water saturation is the most direct and effective method to obtain the oil-water saturation of a reservoir. However, due to the volume change of the pores of the rock and the oil-water within it, decompression deaeration clean-up, drilling fluid invasion and fluid volatilization during the process of coring, experimental measurements of the sum of oil-water saturation are generally only 75% to 85%. There are great losses of oil-water saturation. On the basis of the analysis of the main factors affecting fluid saturation loss changes, based on porosity and permeability compression correction of overburden rocks, using oil-water phase permeability diffluence rate calculation principle as the core, the paper establishes the mathematical correction model of sealed coring wells due to pores and oil-water volume changes and decompression deaeration clean-up which cause fluid saturation losses and changes. This provides a reliable basis for the correction of the real oil-water saturation before oil layer losses and has important theoretical and practical significance.