DEVICE FOR CLEANING OF BOTTOM-HOLE ZONE OF BED Russian patent published in 1999 - IPC

FIELD: oil and gas-condensate production industry. SUBSTANCE: device is intended for cleaning of buttonhole zone and restoration of oil and gas-condensate wells by removing resin-paraffin depositions. Device has power source. Connected to power source is unit for converting power into molecular-wave oscillations. Power converter is made in the form of multiplication pulse generator and molecular-wave cavitator. Pulse generator is made up of hollow body which accommodates tubular rod with piston and valve. Piston and valve are installed on rod with possible axial displacement. Body is provided with bottom having central hole and two peripheral holes. Located in one peripheral hole is throttle valve, and located in other peripheral hole is non-return valve. Made in side wall of central part of body are radial passages. Rod is installed in central hole of body bottom and is provided with end-face cap at opposite side. End-face cap closes its internal passage. Injection chamber is created in combination with body and end-face of valve. Injection chamber is connected to power source and to internal passage of rod. Valve by means of spring located in space created between walls of valve and body and connected to injection chamber is pressed against end-face of piston with creation of space in zone of contact. This space by means of internal circular bore and radial holes in piston wall is connected to radial passages in body side wall. Molecular-wave cavitator is made in the form of sleeve which by its open end is fastened to pulse generator body over periphery of its bottom. Made in side wall of sleeve are radial passages with combining circular groove. Internal space of sleeve is connected by means of aforesaid throttle valve and non-return valve with multiplication chamber of pulse generator. This is created between end-face of piston and bottom of its body. Application of aforesaid embodiment of device increases output of oil and gas-condensate wells due to more effective cleaning of bottom-hole zone of well. Power-input is also reduced. EFFECT: higher efficiency. 1 cl, 3 dwg