微裂缝对低渗储层水驱油渗流规律的影响

微裂缝对低渗储层注水开发有很重要的影响,因此研究和认识微裂缝对开发此类储层具有重要意义.对长6储层5块具有微裂缝的天然岩心进行了室内水驱油实验研究,研究结果表明:①微裂缝对水驱油效率影响不大,但却增大了油水的渗流通道,改善了储层的渗透性;②微裂缝岩心无水驱油效率低,但最终驱油效率与无裂缝岩心相差不大;③微裂缝岩心与无裂缝岩心相比,相渗曲线两相区较窄,含水率上升较快.

Experimental study on the effect of micro-fracture on the water displacing oil law in low-permeability reservoir

It has an important significance to recognize the effect of micro-fracture on the water flooding development of low-permeability reservoirs.Five cores with micro-fractures from Chang 6 reservoir are studied by water displacement oil experiments,and the experimental results show that:(1) the micro-fracture has little effect on displacement efficiency,but it enlarges the flow path of oil and water and improves reservoir permeability;(2) the no-water displacing efficiency of the micro-fracture cores is low,but the final displacing efficiency of them is close to the that of non-fracture cores;(3) compared with non-fracture cores,the two-phase area width of the relative permeability curve of the micro-fracture cores is narrower,and its water cut goes up faster.