MECHANISATION SYSTEM FOR LIFTING AND LOWERING OPERATIONS DURING OVERHAUL AND ROUTINE MAINTENANCE OF WELLS Russian patent published in 2012 - IPC E21B19/14 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas well servicing equipment, and namely to the system of devices for mechanisation of lifting and lowering operations (LLO) with tubing strings during development or maintenance of well and can be used during exploration and development of oil-gas deposits. System for mechanisation of LLO during overhaul and routine maintenance of wells includes hydraulic manipulator on the trailer, automatic elevator on hook block, centraliser, hydro wrench, spider, control panel, hydro station and catwalks. Hydraulic manipulator is equipped with retractable mechanical grip with possibility of gripping the pipe from any point within the pipe size and its supply to the elevator. Hydro wrench retracted towards the pipe by means of hydraulic cylinder is mounted in the frame together with middle centraliser, hydraulic retaining device, centraliser rigidly connected to it with possibility of being moved by means of the second hydraulic cylinder towards the well centre. The frame has the possibility of being turned in horizontal plane relative to the trailer. Catwalks can be made in the form of parallel supports with lodgments mounted on them and made in the form of a channel with rubber inserts with hemi-spherical cutouts, which are arranged on them and installed in turn in several numbers.

EFFECT: increasing the mechanisation degree, reducing LLO with tubing string, enlarging tubing string service life, increasing the safety of operations and production standards.

2 cl, 3 dwg