METHOD OF WELL TREATMENT IN FORMATION Russian patent published in 2003 - IPC

FIELD: mining industry, completion and recovery of discharge of producing wells that decline due to mud grouting of critical area of formation with asphalt-resin-paraffin formations and contamination. SUBSTANCE: well is fitted with valve. High-pressure cylinder with side branch for drainage of well fluid and piston is installed above valve. Low-pressure cylinder with branch pipe to feed compressed gas and piston linked to piston of high-pressure cylinder is placed uniaxially above it to form hydraulic booster. Preliminary pumping of fluid into well is conducted to create pressure sufficient to move fluid to day surface with opening of well space. Periodic pulses of pressure in critical area of formation to create damped standing wave are formed by hammer on surface of well fluid with discharge of compressed gas through hydraulic booster. Compressed gas is fed under pressure into low-pressure cylinder through feeding branch pipe. Pressure of compressed gas is less by value of relation of squares of diameters of cylinders with overlapping of hole of side branch by piston of high-pressure cylinder and with its opening with release of compressed gas from low-pressure cylinder. EFFECT: improved reliability of formation of damped standing wave with amplitude independent of pressure of fluid in space of well, simplified design and increased functional safety of equipment employed to realize this method. 1 dwg