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AssigneeSmart Drilling and Completion, Inc.
InventorsJames E. Chitwood, William Banning Vail, III, Damir S. Skerl, Robert L. Dekle, William G. Crossland
Estimating the term…
A drilling apparatus comprised of a multiplicity of subassemblies for drilling an open-hole extension from within an existing cased borehole located in a geological formation for the production of oil and gas. In one embodiment, one subassembly includes a motor located within a cased section of the borehole that rotates a drill pipe segment attached to a rotary drill bit in the open-hole to drill the open-hole extension of the well. In another embodiment, a shroud encloses the motor located within the cased portion of the well that is used to control the mud flow to and from the bit in the open-hole during the drilling process.
A drilling apparatus comprised of a multiplicity of subassemblies possessing at least a first drilling apparatus subassembly located within a first portion of a cased well, said first drilling apparatus subassembly possessing at least a first motor assembly surrounded by a first annular space that is surrounded by a second annular space, whereby said first annular space is located between the exterior of said first motor assembly and the interior surface of a shroud, and whereby said second annular space is located between the exterior surface of said shroud and the interior surface of said first portion of said cased well.
A method of drilling a borehole into a geological formation that includes at least the step of drilling an extension of said borehole in an uncased portion of the geological formation using at least one drill bit attached to at least a segment of a drill pipe that is rotated by a motor that is located within the interior of a previously cased portion of the wellbore thereby preventing any damage to said motor in the event of a collapse of said uncased portion of said borehole in said geological formation.
Dependencies are inferred from the claim text.