华北油区岩心老化时间综合确定

Comprehensive determination on ageing time of core in Huabei oilfield.

油藏润湿性是评估油藏可采储量 ,控制油藏流体流动行为的一个重要参数。针对“油藏岩石润湿性测定”标准中未具体确定岩石老化时间的问题 ,在建立地层原油和地层水原始饱和度的基础上 ,通过岩石—流体系统的岩样润湿指数、端点渗透率比值和系统组成随老化时间的变化观察 ,提出了岩石—流体系统适当的老化时间。实验结果表明 ,当老化 15d后 。

Reservoir wettability is an important parameter for evaluating recoverable reserves and controlling fluid flow of a oil reservoir. Based on establishing initial saturation of formation oil and water, a suitable ageing time is proposed for rock/fluid system through the observation on change of wettability index, endpoint permeability ratio and composition of rock sample with ageing time for the problem that there is no specific core ageing time in the Standard of “Measurement of reservoir rock wettability”. Experimental result indicates that rock/fluid system reached equilibrium state of wetting after 15 days of ageing time.