INSTALLATION FOR FORCED SET OF PIPES INTO WELL UNDER PRESSURE Russian patent published in 1997 - IPC

FIELD: oil and gas production. SUBSTANCE: installation has improved hydraulic cylinder and pipe-clamp control system. Additional drainage hydraulic line with controlled back valve provides movement of hydraulic cylinder at maximum velocity. Mechanically controlling two- position reverse valve allows switching installation to operate in mechanical mode. Disposition of two-position, dual-line, hydraulically controlled valve makes it possible to considerably increase idle speed of hydraulic cylinder. Connecting controlling back valves to hydraulic lines ensures mechanically stopping hydraulic cylinder in event of unexpected outburst or fall of pipe string being set into well. EFFECT: increased reliability and productivity of installation. 3 dwg