低渗透油藏储层伤害分析及治理对策研究

Research on Reservoir Injury Analysis and Management Countermeasures for Low Permeability Reservoirs

低渗透断块油藏是国内油田的主力开发单元,近年来发现在生产井进行施工作业中,外来入井液对油层伤害严重,特别是清蜡洗井、压裂和压井施工作业后,很长一段时间内难以恢复产能。为此,油藏地质和采油工艺技术人员开展技术攻关,由于不同储层类型的伤害原因和方式不一样,需要针对储层特点进行深入研究,找出影响储层产量的主要影响因素,制定相应的防护措施。基于此,分析了近年来各类作业井中入井液对储层的伤害方式,研究了压井液和压裂液对不同敏感性储层的适用性,并提出了一系列防护措施。

Low-permeability fault block reservoir is the main development unit of domestic oilfield. In recent years, it is found that during the construction operation of production wells, foreign incoming fluids hurt the reservoir seriously,especially after the construction operation of wax cleaning and washing, fracturing and compression wells, and it is difficult to restore the capacity for a long time. For this reason, reservoir geology and oil production process technicians carry out technical research, and because the causes and ways of injury are different for different reservoir types,in-depth research is needed to identify the main influencing factors affecting reservoir production and develop corresponding protective measures for reservoir characteristics. Based on this, the ways of reservoir injury by entry fluids in various types of operating wells in recent years are analyzed, the applicability of pressure fluids and fracturing fluids to reservoirs with different sensitivities are studied, and a series of protective measures are proposed.