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AssigneeQinetiq Limited
InventorsJeremy Leonard Clive Ludlow, Jonathan Geoffrey Gore, Adrian Robert Bowles, Mark Gregory Maylin, Richard Carson McBride, Abdul-Salam Kaddour, Ahmed Yehia Amin Abdel-Rahman
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A high pressure pump for use in the injection of liquid chemicals into subsea oil or gas wells, and intended to be positioned in the subsea environment adjacent to the wellhead, comprises a piezoelectric actuator (19) for reciprocating a plunger (22) which acts to compress and expand the effective volume of a pumping chamber (29) having a valved inlet (15) connected to a source of the liquid and a valved outlet (16) to lead the liquid to the well. The device has a minimum of moving parts and in particular avoids the need for any rotating parts and attendant high performance bearings and seals.
A system for injecting liquid chemical into a subsea well comprising:
A pump comprising a pumping chamber, an inlet and an outlet opening to said chamber, a reciprocable plunger adapted to compress and expand the effective volume of said chamber, and a piezoelectric actuator for reciprocating said plunger, a body structure within which said piezoelectric actuator is housed and a head structure which defines said pumping chamber together with said plunger and means for selecting the volume of said pumping chamber by relative movement between said head structure and said body structure, and means for retaining said head structure in a selected relative position.
Dependencies are inferred from the claim text.