特低渗储层压敏的蠕变性实验

Experimental study on creep deformation of pressure sensibility
for ultra-low permeability reservoir

赵春鹏 岳湘安 吕成远

中国石化石油勘探开发研究院，北京 100083 中国石油大学提高采收率中心，北京 102249

Research Institute of PetroleumExploration and Development, SINOPEC, Beijing 100083, China Research Center of Enhanced Oil Recovery, China University of Petroleum, Beijing 102249, China

为了研究特低渗储层压敏的蠕变特征，选用特低渗天然岩心，在一系列有效压力下，研究渗透率随时间的变化特征及不同有效压力下其变化特征的差异。研究结果表明：在同一有效压力下，岩心渗透率随时间的增加而逐渐降低并最终达到稳定；在较小有效压力发生蠕变达到稳定时，渗透率损失速度更快；在较高有效压力下蠕变达到稳定时所需的时间更短。建议在压敏实验过程中每个压力点稳定足够长的时间直到渗透率稳定，在油藏降压开采过程中监控因蠕变效应带来的渗透率变化，为开发方案的调整提供依据。

In order to study the creep deformation characteristics of pressure sensibility in ultra-low permeability reservoirs, a natural core is chosen to study the alternation of permeability with time at chain active pressures. The study results show that the permeability decreases inch by inch with the time increasing and finally comes to stabilization at same active pressure. The loss velocity of permeability is larger when the creep deformation comes to stabilization at less active pressure, and the spent stabilization time is
short at high active pressure. We suggest that the creep deformation should be taken into account sufficiently during the pressure sensibility experiment, and that the permeability variation created by creep deformation should be monitored during production, providing a foundation for the adjustment of development program.