VISCOUS-RESILIENT COMPOUND FOR COMPLETION AND OVERHAUL OF WELLS Russian patent published in 1998 - IPC

FIELD: oil and gas well repair and maintenance machinery and equipment. SUBSTANCE: compound can be used as well killing fluid, perforation medium, hydraulic fracturing fluid, sand-carrying agent, and also as viscous-resilient dividing agent in cementation of wells. Compound has following components, mass%: reagent based on polysuccharides 1-3, hydroxide of alkali metal 0.05-0.45, sulfate of aluminium or copper 0.15-0.3, monoperoxihydrate of urea 0.1-0.2, water - the balance. Application of aforesaid compound ensures reduction of penetrating and sedimentation action on productive reservoir due to reduced time for structurization. Also it cuts filtration, increases viscosity with retention of permeability for oil in zone of sedimentation. Ensured is uniform destruction of compound without shrinkage with retention of low filtration of compound after destruction with simultaneous retention of high gas-holding characteristic. EFFECT: higher efficiency. 2 tbl