A heater cable is strapped alongside tubing in a well to heat the production fluids flowing through the tubing. The heater cable has three copper conductors surrounded by a thin electrical insulation layer. An extrusion of lead forms a protective layer over the insulation layers. The lead sheaths have flat sides which abut each other to increase heat transfer. A metal armor is wrapped around the lead sheaths of the three conductors in metal-to-metal contact. Three phase power is supplied to the conductors, causing heat to be generated which transmits through the lead sheaths and armor to the tubing.
申请公布号
WO9816089(A1)
申请公布日期
1998.04.16
申请号
WO1997US18403
申请日期
1997.10.08
申请人
BAKER HUGHES INCORPORATED
发明人
NEUROTH, DAVID, H.;DALRYMPLE, LARRY, V.;BAILEY, ROBERT