HEATING METHOD AND DEVICE FOR OIL PRODUCTION WELL PROVIDED WITH SUCKER-ROD BOREHOLE PUMP Russian patent published in 2006 - IPC E21B43/24 E21B37/00 E21B36/04 

FIELD: oil industry, particularly equipment for paraffin removal from oil production wells provided with sucker-rod borehole pumps in different climatic zones.

SUBSTANCE: heating method for oil production well provided with sucker-rod borehole pump installed inside flow string, wherein sucker rods of borehole pump are hollow and are joined with each other in air-tight manner involves arranging flexible insulated heating cable inside hollow sucker rods; uniformly heating produced fluid over a distance from well head to lower end of flexible insulated heating cable up to temperature 2-60° exceeding temperature of paraffin melting in produced fluid, wherein produced liquid heating is carried out directly through hollow sucker rod string during reciprocation thereof inside flow string. Well heating device comprises flexible insulated heating cable and power source. Flexible insulated heating cable is connected to power source through heating control station. The flexible insulated heating cable is arranged in sucker rod string of sucker-rod borehole pump with outer diameter of 12-74 mm. Hollow sucker rods may reciprocate inside flow string. Sucker-rod borehole pump has drive to provide sucker rod string reciprocation inside flow string. The pump also comprises body, plunger piston and central hollow shaft. Lower hollow shaft part is connected with plunger piston. Upper hollow shaft part is attached to hollow sucker rod string through hollow sub. Lower end of flexible insulated heating cable is arranged inside central hollow shaft. The body is rigidly secured inside flow string. Plunger piston is connected with lower hollow sucker rod string end through solid shaft. In accordance to another embodiment sucker-rod borehole pump has drive to provide sucker rod string reciprocation inside flow string, body, plunger piston, central hollow shaft and suction and pressure valves. The body is rigidly secured inside flow string. Plunger piston is connected with lower hollow sucker rod string end through solid shaft. Plunger is secured to lower hollow shaft part, upper hollow shaft part is provided with sub, which connects hollow shaft with hollow sucker rod string. Hollow shaft extension is connected to lower hollow shaft part. Fastened to hollow shaft extension through hollow sub is additional part of hollow shaft string.

EFFECT: increased efficiency of oil production well heating, prevention of paraffin deposit on walls of wells having outputs typical of above well kind.

13 cl, 6 dwg