GEL-FORMATION COMPOUND FOR ISOLATION OF WATER INFLOWS TO WELL Russian patent published in 1999 - IPC

FIELD: oil and gas production industry. SUBSTANCE: this gel-formation compound relates to compounds used in carrying out repair and isolation operations in oil wells. Gel-formation compound contains following components: polyacrylamide, potassium bichromate and reducing agent. Used in function of reducing agent is sodium N,N-diethyldithiocarbamate. Proportioning of components in gal-formation compound is as follows, mas.%: polyacrylamide, 0.4-0.6; potassium bichromate, 0.15-0.3; sodium N,N-diethylthiocarbamate, 0.1-0.3; water, the balance. Advantages of aforesaid compound include prolonged period of gel-formation with simultaneous retention of its stability and also its resistance to action of bed brine containing substantial amounts of bivalent iron ions. EFFECT: higher efficiency. 2 tbl