1
Alexander Angus Grant, Per Almdahl, Per Eivind Gramme, Sven Arne Kjolberg, Bjarne Olsen, Terje Sondtvedt: Downhole gas/water separation and re-injection. Weir Pumps, Norsk Hydro ASA, Gifford Krass Groh Sprinkle Anderson & Citkowski P C, February 17, 2004: US06691781 (78 worldwide citation)

It is common in oil extraction operations to reinject produced gas and\or water back into hydrocarbon bearing formations in order to maintain formation pressure. Conventional production facilities normally flow all formation fluids to the surface and subsequently reinject the required fluids ba ...


2
Harden William Guy, Peach Keith Richard: Improvements in downhole pumps. Weir Pumps, October 14, 1998: GB2324108-A (48 worldwide citation)

A method of improving production from a producing zone (22) in a hydrocarbon-producing well comprises the steps of pumping injection water into the well, utilising the injection water to drive a downhole pump (18), and utilising the pump (18) to increase the pressure of production fluid flowing from ...


3
Michael Leslie Ryall: Multistage pumps and compressors. Weir Pumps, Young & Basile P C, May 26, 1998: US05755554 (19 worldwide citation)

A multistage pump or compressor includes a series of axial flow stages. Each stage comprises an impeller for imparting whirl to the pumped fluid in one direction and a stator including vanes for imparting whirl to the pumped fluid in the opposite direction. The stator vanes define flow passages conf ...


4
Ryall Michael Leslie: Axial-flow pumps.. Weir Pumps, September 13, 1995: EP0671563-A1 (15 worldwide citation)

A multistage axial flow pump or compressor comprises at least one stage (10) including a rotor (16) and a stator (20). The rotor (16) is arranged to impart whirl in one direction, while the stator (20) is arranged to impart whirl in the opposite direction. This arrangement is useful in providing com ...


5
Ryall Michael Leslie, Anderson Harold Henry, Pezzani Guido: Fluid machines. Weir Pumps, Becker John E, April 2, 1974: US3801217 (13 worldwide citation)

A multi-stage centrifugal pump which includes a plurality of stages the impellers of which are mounted on a shaft common to all stages. All the stages are mounted within a tie-frame carrying pump inlet and delivery connections and are arranged between an inlet end member and a delivery end member. T ...


6
Michael L Ryall: Multistage axial flow pumps and compressors. Weir Pumps, Young & Basile, October 8, 1996: US05562405 (12 worldwide citation)

A multistage axial flow pump or compressor comprises at least one stage (10) including a rotor (16) and a stator (20). The rotor (16) is arranged to impart whirl in one direction, while the stator (20) is arranged to impart whirl in the opposite direction. This arrangement is useful in providing com ...


7
Angus Grant: Downhole gas compression. Weir Pumps, Gifford Krass Groh Sprinkle Anderson & Citkowski P C, August 5, 2003: US06601651 (12 worldwide citation)

A downhole gas compression system is adapted for location in a bore of a natural gas-producing well (


8
Grant Alexander Angus: Downhole gas compression using a compressor driven by a gas-filled electric motor. Weir Pumps, December 5, 2001: GB2362901-A (11 worldwide citation)

A downhole gas compression system for location in a bore includes an axial flow compressor 32 and a gas-filled electric drive motor 30. The system may include valves (62, figure 2) which permit gas from the motor to vent into the bore 12 but which prevent flow in the opposite direction. Preferably, ...


9
Michael L Ryall: Fluid machines. Weir Pumps, Mason Fenwick & Lawrence, March 13, 1979: US04143999 (10 worldwide citation)

A pump for low head duties includes an impeller portion and a diffuser portion which together define the entire liquid retaining and guidance means between the inlet and the outlet, the impeller serving to raise liquid from a lower reservoir and having a plurality of spiral passages therethrough in ...


10
Ryall Michael Leslie: Improvements in or relating to rotodynamic pumps. Weir Pumps Formerly G & J, January 6, 1971: GB1218023-A (9 worldwide citation)

1,218,023. Centrifugal axial-flow pumps. WEIR PUMPS Ltd. July 24, 1968 [July 7, 1967], No.31309/67. Heading F1C. A rotodynamic pump for liquids comprises at least one impeller mounted within a housing, and an inducer to permit the pump to operate at a higher speed or with a lower suction head withou ...



Click the thumbnails below to visualize the patent trend.