1. n. [Well Workover and Intervention]

A downhole assembly or tool system used in the repair of liner damage, corrosion or leaks. Liner patches are most frequently used as short- to medium-term repairs that enable production to be resumed until a major workover operation is scheduled. In some cases, such as in depleted wells nearing the end of viable production, a liner patch may be the only economic means of safely returning the well to production.

See: casing,  casing patch