密闭取心井岩心饱和度校正物理模拟实验

Physical simulation experiment on the saturation correction for sealed coring wells.

密闭取心井岩心饱和度室内分析结果是评价储层水淹状况的重要数据,而实测密闭取心井岩心的油水饱和度常常偏离地层孔隙中的油水饱和度真实值。通过分析影响含水饱和度测量结果的主要因素,以胜利油区永3-检1井为例,通过模拟降压脱气过程,研究了取心过程中降压脱气造成的含水饱和度损失,分析了含水饱和度损失的主要影响因素。实验结果表明,岩样的原始含水饱和度和溶解气油比决定了降压脱气造成的含水饱和度损失,可利用实验得到的脱气前后岩样含水饱和度之间的关系对岩样的实测含水饱和度进行校正,使其更接近实际地层中的真实含水饱和度。

Fluid saturation analysis of core samples for sealed coring wells is one of the important data which is used to evaluate watered-out behavior in the reservoir,but the measured fluid saturation values in the laboratory usually deviate from the real values in the reservoir. The factors influencing the measured results of water saturation were reviewed.Taking inspection well Yong3-J1 as an example, the process of depressurizing and degassing was simulated and the effect of the depressurizing and degassing on water saturation was researched.The experimental results show that the primary water saturation in the core sample and the dissolved gas/ oil ratio depends on water saturation loss owing to the depressurizing and degassing.Based on the regression formulation reflecting the relation between the water saturation before degassing and the one after degassing,the analyzed water saturation in the laboratory can be corrected so that the measured results approximate real values.