CIRCULATION WATER SUPPLY SYSTEM FOR BORE-HOLE Russian patent published in 1997 - IPC

FIELD: oil and gas industry. SUBSTANCE: this is intended for drilling oil and gas wells with high level of ecological requirements, that is with no pollution to environment. Closed-circuit or circulation water supply system of bore-hole has following interconnected components: clear water unit 1, closed circuits for preparation and treating of drilling liquid 2, receiving vessels 3, drilling liquid purification unit with following successively interconnected vibrating sieves 6, sand separator 7, silt separator 8, sludge wash-off unit together with centrifuge 9, vibrating sieve 10, settler 11, circulation water vessel 12, preliminary cleaning unit 16, final cleaners 17, unit for treating with chemical reagents 24, 25, system for transporting and burial of washed-off sludge 14, 26. EFFECT: high efficiency. 1 cl, 1 dwg