DEVICE FOR WELL HEATING AND METHOD FOR MAINTENANCE OF WELL HEATING CONDITIONS Russian patent published in 1995 - IPC

FIELD: oil producing industry. SUBSTANCE: installed in well pipes is heater in form of metal cylinder consisting of upper and lower parts of heated surfaces different in cross-section. Cylinder parts are electrically connected and the cylinder itself is connected with power source. Parameters of relations of heater parts lengths, sectional areas and heated surface areas are interrelated. Heating conditions are controlled by comparing temperatures of fluid heated in well and paraffin melting, well pipe and heated surface. Values of operating current are established as referred to minimum current value required for prevention of paraffin settling within preset limits. EFFECT: higher efficiency. 7 cl, 2 dwg, 1 tbl