靖边奥陶系碳酸盐岩储层损害机理及保护钻井液研究
Study on Reservoir Damage Mechanism and Protection Drilling Fluid of Jingbian Ordovician Carbonate

利用X-衍射、电镜扫描、成像测井资料分析、压汞分析等实验手段对靖边奥陶系碳酸盐岩储层岩心进行了储层组构分析、孔渗结构分析、敏感性实验评价以及表面润湿性分析，实验结果表明，靖边奥陶系碳酸盐岩储层岩心发育有微裂缝、不均质性强，属于典型的低孔隙度、裂缝性储层，造成储层伤害的主要原因是应力敏感和水锁。针对碳酸盐岩储层损害特点，基于解水锁剂优选、暂堵材料粒径级配优化，研制出了抗高温碳酸盐岩储层保护钻井液。
The fabric analysis, poroperm composition analysis, surface wettability analysis and sensitivity test were conducted with cores out of Jingbian Ordovician carbonate reservoir by X-ray diffraction, SEM, image logging and mercury penetration method. Experimental results show that the core of Jingbian which was belonged to the typical low porosity, fractured reservoir, had the characteristics of developed micro-cracks and strong heterogeneity. The main reason for formation damage was stress sensitivity and water blocking. Aimed at the characteristic of Ordovician carbonate reservoir damage, the size grading of temporary plugging materials was optimized, the anti-water blocking additive was selected and the anti high temperature reservoir protection drilling fluid was developed.