Abstract: A method for assembling and delivering a drivepipe to a drill site. The method has the following steps: The drivepipe is assembled at a shoreline assembly station. Floatation devices are attached to the drivepipe and the drivepipe is floated in the ocean. The drivepipe is towed with tow vessels to a drill site. The drivepipe is delivered in a horizontal orientation to a drilling vessel at the drill site. An upper end of the drivepipe is attached to the drilling vessel and the tow vessels are detached from the drivepipe. The drivepipe is pivoted about its point of attachment to the drilling vessel until the drivepipe is vertically oriented. The buoyancy function of the floatation devices attached to the drivepipe is deactivated. The floatation devices are removed from the drivepipe. The drivepipe is equipped with a driving mechanism and the drivepipe is lowered with a running string from the drilling vessel to the sea bed.

Abstract: A method for treating carbonaceous material, e.g. waste oil containing PCB toxic materials, by effecting the pyrolytic gasification thereof to produce a relatively high BTU content gas that is substantially free of the toxic materials to supplement or substitute for natural gas. This is attained by a furnace in which the products of combustion are utilized to separately generate steam and to preheat a supply of carbonaceous material which may be mixed with water. The generated steam is mixed with the preheated carbonaceous material and passed through a premixing and/or a primary dynamic mixer wherein the preheated carbonaceous material and steam mixture is further heated to a temperature ranging between 1600.degree.-1800.degree. F. to effect a partial gasification of the carbonaceous material. The partially gasified material is thereafter directed through one or more secondary dynamic mixing chambers to be further heated in the presence of additional steam to complete the gasification thereof.