OIL HEATING DEVICE Russian patent published in 2005 - IPC

FIELD: equipment for oil wells, particularly to create optimal thermal conditions in production wells to prevent asphaltene-paraffin precipitations in production strings of oil wells and oil pipelines.

SUBSTANCE: device has heating cable to be lowered in area of potential paraffin formation, as well as power conductors, armor and temperature sensor leads connected to the cable. Temperature sensor is located inside heating cable. Armor is provided with outer polymeric shell and is connected up to protective grounding. Power conductors, armor and temperature sensor leads have intermediate electric connectors arranged in transition terminal box. Heating cable control system is connected to the box. Automatic switch with input power supply loop of power circuit is installed inside control system case. The switch is connected to warning light unit and to controllable rectifier bridge. The rectifier bridge is connected to measuring tool unit and output panel provided with electrotechnical leads. Control unit is connected with temperature sensor and with output circuits of measuring and operation unit by wires. Output circuits of measuring and operating unit are linked with control unit, which is connected to controllable rectifier bridge. Power supply of control circuits with input power supply loop of control circuits linked thereto is connected to control unit and with measuring and operating unit. Lower end of heating cable is immersed in production string and secured to it through packing means. Production string is installed in casing pipe. Hole annuity used to conduct heat from production string to ground is defined by casing pipe and production string. On ground surface heating cable passes through guiding roller, tensioning roller and is secured to lock.

EFFECT: reduced power inputs and increased reliability.

1 dwg