Hydraulic submersible insert rotary pump and drive assembly

Abstract

A hydraulic submersible rotary pump and drive assembly is provided which can be deployed and recovered through production tubing or casing using hydraulic metal tubing lines. The assembly can be used in conventional oil and gas well bores, but is particularly advantageous in slant or horizontal oil and gas well bores for artificial fluid lift or water injection. It eliminates mechanical drive shafts running from surface to a bottom hole rotary pump, and allows rotary pumps to be changed without pulling out the production tubing. The drive assembly incorporates a ported torque neutralizing connector sub to attach a suitable hydraulic drive motor to a selected submersible rotary production pump. The pump drive also incorporates the use of a conventional pump seating nipple in the production tubing and seating cup assembly on the drive to seal the pump discharge from the pump suction within the tubing. In an alternate version, the assembly is capable of being used with a pack-off assembly (rather than the pump seating nipple) to seal against a production casing or open hole when it is desirable not to use production tubing.

Dependencies are inferred from the claim text.