Abstract: A rotatable drilling shoe attachable to a section of casing that allows for drilling and casing of a well bore in a single trip. The drilling shoe includes a fixed section and a rotatable section that has a drillable bit attached thereto. The drilling shoe further includes a mechanism for inhibiting rotation of the rotatable section after the casing is cemented into place so that the drillable bit can be drilled out by a subsequent drilling operation.

Abstract: A method and apparatus is described for a downhole submersible electrical power generator. The electrical power generator includes a housing forming a fluid conduit. An inlet is disposed on the housing. Also, an outlet is disposed on the housing where the inlet and the outlet are adapted to allow a fluid to flow into and out of the housing, respectively. A fluid flow powered electrical power generator is disposed inside the housing and is adapted to generate electrical power from the fluid flowing through the housing. An isolation packer is disposed outside the housing between the inlet and the outlet where the isolation packer is adapted to isolate the inlet and the outlet in different zones in a wellbore.