Composition and method for sealing permeable subterranean formations

摘要

A mixture of an epoxy material and two hardeners is placed in a subsurface zone in which it is desired to form an impermeable zone, and the epoxy is thereafter allowed to harden. The epoxy material and hardeners are characterized inthat: (1) each hardener has a different activation temperature; (2) the amount of each hardener in the mixture is less than that required to totally react the epoxy material; (3) the epoxy material has a low viscosity at subsurface conditions of temperature and pressure; (4) the epoxy material is substantially immiscible with any fluids which are present in the subsurface area; and (5) the hardening time of the epoxy material is of short duration at subsurface conditions of temperature and pressure.