秦家屯油田注水井酸化措施效果分析

The Application of Acidizing Injection Wells in Qinjiatun Oilfield

造成注水压力上升的原因主要是:油田属砂岩油藏,采用清水、污水混注方式注水,由此产生大量无机垢沉淀堵塞地层孔道;注水水质不合格导致渗透率下降;敏感矿物伤害造成黏土膨胀,产生沉淀。为此提出降压增注的酸化措施,对吸水严重不均匀的井实行分层酸化,而对吸水比较均匀井进行笼统酸化。

This paper introduces the causes of water injection pressure rise. The oilfield is a kind of sandstone reservoir. It＇s injected by mixed water, which result in the block of pipe hole. Unqualified injection water causes lower permeability. The hurt of sensitive mineral can result in clay expansion. According to these problems, this paper puts forward the acidification method of depressurization and augmented injection. Uneven bibulous wells can be taken layered acidification, and even bibulous wells can be taken general acidification.