Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With suction pump inlet communicating with bore bottom
Reexamination Certificate
2005-06-14
2005-06-14
Tsay, Frank (Department: 3672)
Boring or penetrating the earth
With above-ground means for handling drilling fluid or cutting
With suction pump inlet communicating with bore bottom
C175S217000, C175S007000, C166S084400, C417S392000
Reexamination Certificate
active
06904982
ABSTRACT:
A sub-sea mud pump system includes a plurality of pump units, and each pumping unit includes a plurality of pumping elements. Each pumping element includes a pressure vessel with a first and a second chamber, a separating member between the first and second chambers, a measurement device adapted to measure the volume of at least one of the first and second chambers, a hydraulic inlet control valve and a hydraulic outlet control valve coupled to the first chamber, a mud suction valve and a mud discharge valve coupled to the second chamber. The first chamber is hydraulically coupled to receive and discharge a hydraulic fluid, and the second chamber is hydraulically coupled to receive and discharge a drilling fluid. The separating member is adapted to move within its the pressure vessel in response to a pressure differential between the first and second chambers. The pump system also includes a hydraulic control unit adapted to control the plurality of pump units.
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Brooks Ronald D.
Judge Robert A.
Nguyen Dat Manh
Wade Harold
Hydril Company
Osha & May LLP
Tsay Frank
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