OIL WELL RECOVERY DEVICE Russian patent published in 2007 - IPC E21B37/08 

FIELD: oil production, particularly methods or apparatus for cleaning boreholes or wells.

SUBSTANCE: device comprises jet, valve, protective case and guiding pipe. Steam generator is connected to hoisting crane from the first steam generator side and to valve and rod string from the second side thereof. Jets are installed downstream of the rods along the full oil layer height and are inclined or transversal to axis. Spacing between the jets is l=0.001-50 m. Lid fastened to casing pipes by means of flange connection is provided with jet connected with liquid nitrogen cylinder and with gaseous nitrogen cylinder from outer side thereof. Gaseous nitrogen cylinder is provided with reductor and is filled with nitrogen under 10 MPa pressure. Temperature sensor is installed from inner side of the lid. Temperature sensor range is 50-100°C. Temperature sensor is connected to automatic switching system, which activates and deactivates valves of liquid and gaseous nitrogen cylinders.

EFFECT: increased operational safety at high pressure and temperature and channel cleaning of hardened paraffin and viscous substances simultaneously throughout the full oil-bearing layer height.

1 dwg