BOREHOLE VALVE DEVICE Russian patent published in 1995 - IPC

FIELD: oil extracting industry. SUBSTANCE: valve, made as seat and bolt is mounted in hollow body, located eccentrically in respect to pump-compressor string. Body has canals to communicate with cavity of pump-compressor string and outer space. There is fixer of valve open state, located between seat and canal, that communicates body cavity with cavity of pump-compressor string. During reversal cleansing liquid from pipes outside space is fed into string through canals 4 and 2. Before direct cleansing or discharge of liquid bolt 6 from pipes outer space is preliminary pushed through fixer 7, then during direct cleansing or string 3 lifting liquid from it goes to pipes outer space through canals 2 and 4. As pressure is raised up to value, that is sufficient for bolt 6 passing through fixer 7 downwards, bolt 6 sets in seat 5. EFFECT: device allows to carry out boreholes cleansing, including their treatment with reactants and ensures liquid discharge during removal of lifted string from borehole. 3 cl, 3 dwg