BOTTOM-HOLE WATER HEATER FOR INJECTION WELL Russian patent published in 2003 - IPC

FIELD: oil producing industry; applicable in injection wells for thermal flooding of producing formations. SUBSTANCE: bottom-hole water heater includes electrodes lowered into well on power supply cable together with tubing. Electrodes are used in the form of bare ends of supply cable wires separated with insulating bushes and capable of radial motion. Insulating bushes have U-shaped spring-loaded inserts with projections. Electrodes are secured in inserts. Insulating bush insert projections are engageable with bush internal surface. Distance between electrodes in upper part is larger than in lower part. Difference of distances between electrodes in upper and lower parts is determined by mathematical formula. Bottom-hole water heater for injection well has supply cable weight balance. Supply cable is used in the form of load -carrying cable. Bottom-hole water heater has conducting tubes fitted on electrodes. Tubing has guide funnel. Electrodes are located below tubing. EFFECT: increased operate reliability of bottom-hole water heater for injection wells, simplified its design and reduced its cost. 7 cl, 5 dwg