A composition including a wellbore work fluid and a polymer having mechanically labile chemical bonds is injected downhole, and combines with fluid present downhole to yield a composite fluid. Mechanical energy (e.g., ultrasonic energy) is provided to the composite fluid downhole to cleave the mechanically labile chemical bonds in the polymer. The polymer may be used as a viscosifier, friction reducer, or fluid loss additive. Cleaving the mechanically labile chemical bonds with mechanical energy allows precise degradation downhole.
向井下注入包括井筒工作流体和具有机械易变
化学键的聚合物的组合物,并与井下存在的流体结合生成复合流体。向井下复合流体提供机械能(如超声波能),以裂解聚合物中的机械易变
化学键。聚合物可用作增粘剂、减摩剂或流体损失添加剂。利用机械能裂解机械易变
化学键可实现井下精确降解。