板桥油田压井作业后储层潜在伤害机理研究

Research on Potential Formation Damages of Banqiao Block after Well Killing

板桥油田在实施压井作业转抽后,由于储层在压井作业过程中受到伤害,一些油井产能下降甚至完全丧失。为给板桥油田在压井作业过程中实施油层保护措施提供理论依据,在分析储层特征的基础上,利用室内模拟分析试验手段,结合油田开发生产现状,进行了储层敏感性评价试验,分析得到了板南断块压井液滤液对地层的潜在伤害机理:地层静压较低,水基压井液在较大压差的作用下侵入地层,对储层造成强水敏、强盐敏、速敏等敏感性伤害,致使地层渗透率降低,加剧了水锁伤害。

After oil pumping were implemented on producers in Banqiao Oilfield,some productivity of producers was reduced even lost totally due the formation damage during well killing.For the purpose of providing theoretical basis to protect the formation during well killing in Banqiao Oilfield,formation sensitivity evaluation study was conducted using stimulation analysis and production data based on the analysis of the formation characteristics.The reasons of potential damage due to well killing fluids in Bannian block were obtained,including small static formation pressure,water based killing fluid entering the formation due to large pressure difference,strong water sensitivity,strong salt sensitivity,permeability reduction,and aggravation of water blocking damage.