Borehole cleaning using downhole pumps

Wells – Processes – Cleaning or unloading well

Reexamination Certificate

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Reexamination Certificate

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07905291

ABSTRACT:
An apparatus for borehole cleaning comprises a tubular conveyance extending from the surface into a borehole to a region to be cleaned, a motor mounted at the end of the tubular conveyance that in use is introduced into the borehole, a pump connected to the motor and having a nozzle, and a power cable extending trough the tubular conveyance from the surface to provide power to the motor, The pump is arranged such that, when positioned in the borehole and operated by the motor, the pump withdraws material from the borehole through the nozzle and pumps it into the tubular conveyance to the surface.

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p. 247 Well Cementing, 2nd Edition, E. Nelson and D. Guillot editors, Schlumberger 2006.
p. 521-543 Well Cementing, 2nd Edition, E. Nelson and D. Guillot editors.

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