| 摘要 |
Tubing which contains crude oil being moved to the surface is surrounded by concentric sections of pipe at various depths along portions of the tubing. Said concentric sections of pipe contain a porous media incorporating an oxidizing catalyst in the annulus between said pipe and the tubing. A fuel and oxygen containing gas is passed down the tubing/casing annulus and passes through the catalyst bed causing the fuel to burn. The exhaust gas may be passed to the surface or it may enter the crude containing tubing to assist in gas lifting the crude to the surface. The crude is heated by the heated sections surrounding the tubing and by the hot exhaust gases thus reducing the crude viscosity and preventing the building up of wax within the tubing. The catalyst bed may alternatively comprise a single layer of catalyst supporting particles attached to the outer surface of the production tubing string or selected sections thereof.
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