Method and system for introducing electric current into a well

Details Method and system for introducing electric current into a well Method and system for introducing electric current into a well

E - Fixed Constructions

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B

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E21B 36/00 (2006.01) E21B 17/00 (2006.01) E21B 36/04 (2006.01) H01R 4/64 (2006.01) H01R 13/523 (2006.01)

Patent

CA 1271980

ABSTRACT OF THE DISCLOSURE A method and system for supplying power to a well. In one embodiment power is used for heating a well tubing from adjacent the surface down to a selected level to prevent the formation of solids such as paraffin or hydrates. The tubing is heated at least in part by passing an electric current therethrough. In one form the tubing is insulated from the wellhead and the casing down to a selected level where an electrical connection is made between the tubing and casing. Current is applied to the casing and to the tubing at a point below an insulating tubing collar. In another form an insulated conduit is run into the well to a selected depth at which the conduit is electrically connected to the tubing. Electrical power is connected to the tubing and to the insulated conduit. In another form a sucker rod is electrically insu- lated from the tubing down to a selected depth. At or adjacent the stuffing box on top of the well the sucker rod includes a non-conducting section such as a fiberglas sucker rod. A conduit is run through the fiberglas rod and connected to the steel sucker rod therebelow. Power is connected to the conduit through the fiberglas rod and to the wellhead. The system employing the tubing insulated from the casing may be utilized to supply electric power to a load such as a motor or the like by connecting the motor between the tubing and the electrical connection between the casing and tubing. Also disclosed is a system for preventing formation of solids in a petroleum well by suspending a loop of wire in a well and passing a controlled amount of power along said loop of wire to heat the wire and the fluid and tubing in which it is suspended in which the loop of wire has sections of different resistance to apply different amounts of heat at different depths of the well. Further, there is disclosed an electromagnet for use as a contact between a wire and a well tubing and/or as an anchor.

540799

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