Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
2005-08-09
2005-08-09
Koczo, Jr., Michael (Department: 3746)
Pumps
Motor driven
Electric or magnetic motor
C166S066400, C417S555200
Reexamination Certificate
active
06926504
ABSTRACT:
An improved electrical pump is first provided for use in a wellbore. The pump comprises a stator and a stator housing, and an armature and an armature housing. The stator housing and the armature housing define concentrically nested tubular bodies. The armature housing is configured to permit production fluids to flow therethrough. In one aspect, the stator and armature are assembled in connectible and interchangeable sections called “modules” that can be attached in series. In one aspect, the electrical operation of coils within the stator is protected from individual coil short-circuiting or failure by wiring them in parallel, rather than in series. In addition, each module may be wired in parallel. In this way, a failure of one stator module will not result in the failure of another stator module. In an embodiment of the present invention, the valves of the pump are capable of being retrieved by a wireline, without pulling the entire production string. A method for using a plurality of electrical pumps is also provided. The configuration of the electrical pumps allows multiple linear pumps to be placed in series with the production tubular member. Alternatively, a rotary pump design is provided which allows multiple rotary pumps to be placed in series with the production tubular member.
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Eni S.p.A.
Koczo, Jr. Michael
Moser Patterson & Sheridan LLP
Shell International Exploration & Production B.V.
Total Fiza Elf
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