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以往裂缝性碳酸盐岩储集层应力敏感性研究多关注于基块和无固相侵入裂缝的情况,而对固相侵入后的裂缝应力敏感性鲜有研究。钻遇裂缝性储集层时易发生固相侵入损害,注入水悬浮固相亦不可避免会进入裂缝。固相颗粒在裂缝壁面形成的滤饼将影响应力作用下的裂缝闭合。制备致密裂缝碳酸盐岩露头岩样,开展工作液动态损害后的应力敏感性评价实验,研究了无固相侵入裂缝和固相侵入裂缝应力敏感性,用扫描电镜分析了裂缝壁面及固相侵入带的微观结构。结果表明,无固相侵入裂缝岩样应力敏感性系数平均值仅为0.21,固相侵入裂缝岩样应力敏感性系数平均为0.52,应力敏感程度显著增强。固相侵入使裂缝渗透率恢复率更低,导致储集层永久性损害。
In the past, the research on stress sensitivity of fractured carbonate reservoirs focused on the case of base block and solid-state intrusion without any research on the stress sensitivity of fractures after solid-phase intrusion. Drilling into fractured reservoirs is prone to solid-phase invasion damage, and injection of an aqueous suspended solid phase will inevitably lead to cracks. The filter cake formed by solid particles on the crack wall will affect the crack closure under stress. Preparation of compact fractured carbonate rock outcrop rock samples to carry out the dynamic response of the working fluid stress sensitivity evaluation experiments to study the solid-phase invasion and solid-phase intrusion fracture stress sensitivity, the scanning electron microscope analysis of the fracture wall and solid phase Intruding band microstructure. The results show that the average stress sensitivity coefficient of rock samples without solid intrusion is only 0.21, and the average stress sensitivity coefficient of solid intrusion fractured rock samples is 0.52, and the stress sensitivity is significantly enhanced. Solid-phase intrusion leads to lower rates of fracture permeability recovery, resulting in permanent reservoir damage.