【摘要】 屏蔽式暂堵技术是改造钻井液的重要技术措施,且我国多数储层属中低渗透性储层。因而,对中低渗透性人造岩心进行了屏蔽式暂堵技术的研究。采用岩心渗透率测定法,研究了架桥及填空规律、压差和时间对暂堵效果的影响、堵塞深度及反排解堵。由研究得出,按2/3桥堵原则设计的,具有架桥和填充粒子的改造钻井液,能快速有效地对中低渗透性岩心实现浅层暂堵,尔后可用射孔或反排法解堵。更多还原

【Abstract】 The technics of barrier-building temporary seal is an important subject in drilling fluid transformation. Core samples with low to medium permeability were taken for experiments because a majority of reservoirs in China are included in this permeability range. Using method for core permeability measurement, effect of pressure difference and time on effectiveness of temporary sealing, depth of plugging and plug removal by reverse flow were examined. It was concluded that the transformed drilling fluid containing bridging and plugging particles is capable to make quickly low to medium permeability cores to be temporary sealed with a thin layer which may be removed by perforation and reverse flow.更多还原