Nexen Inc.

Canada

Nexen Inc.

Canada

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Patent
Nexen Inc. | Date: 2017-04-19

Motion control apparatus (A) includes a direct coupled torque motor (54) slideably receiving an output (50) without other types of torque transmission devices between the output (50) and the motor (54) and between the output (50) and a pinion (7) in direct gearing engagement with an annular gear (44) connected to a second race (32) of a bearing (26) intermediate an annular mounting plate (38) and a dial plate (40). The second race (32) is a single, non-separable piece having L-shaped, radial cross sections to define a mounting pilot for the annular gear (44). The motor (54) is secured to a mount plate (58) having an integral annular spacer (60) extending through a mounting tab (16) and secured to a mount ring (62) adjustably connected to the mounting tab (16) opposite to the mount plate (58).


A method for measuring non-drilling times during well construction operations includes automatically determining a staring time and a stopping time of at least one non-drilling activity. An elapsed time between the starting time and the stopping time of the activity is recorded. The recorded time is normalized for at least one of a well depth and a water depth.


A method for measuring non-drilling times during well construction operations includes automatically determining a staring time and a stopping time of at least one non-drilling activity. An elapsed time between the starting time and the stopping time of the activity is recorded. The recorded time is normalized for at least one of a well depth and a water depth.


Patent
Nexen Inc. and Siemens AG | Date: 2013-08-05

Systems and methods of removing sulfur from a gas stream comprising hydrogen sulfide (H_(2)S) is provided. The systems and methods may utilize iodine to remove sulfur from the gas stream. In certain systems and methods, the iodine may be regenerated. In particular, the present systems and methods may be capable of reducing sulfur content in a gas stream comprising hydrogen sulfide H_(2)S gas to levels that are undetectable.


A method for remediation of at least one cold spot in a producer well in a Steam Assisted Gravity Drainage (SAGD) process to increase hydrocarbon recovery from a hydrocarbon reservoir, wherein the SAGD process occurs at a site including an injection well, a production well and a steam chamber. The method includes shutting the production well and maintaining or increasing steam injection through the injection well until pressure in the steam chamber increases. The production well is then resumed while continuing steam injection at rates for normal SAGD or greater until reservoir pressure reaches normal operational pressure. Optionally, the injection/production is adjusted to return to normal SAGD operation.


Patent
Nexen Inc. | Date: 2013-08-21

A strain wave gear system (10) includes first and second sets of ball bearings (80, 82) located intermediate a flange (84) and a retainer plate (88) rotatable with an output (54) and a radially oriented flat disc (74) of the input including strain relief (76). Strain relief (76) is a helical slot in a coupling (70) located radially within the wave generator (94) and the ring gear (22). The ring gear (22) is sealed by a sealing system including sealant (42) forced by a protrusion (34) of the cap (24) entering into a cavity (36) through a channel (40) into a relief volume (38) of the housing (12). The bearing (48) rotatably mounting the housing (12) to the output (54) is lubricated by a lubricating system including plungers (110) threadably received in axial bores (102) intersecting with radial bores (104) in communication with radial holes (47) of the bearing (48).


Patent
Nexen Inc. | Date: 2013-06-27

The use of a water recycle ratio for controlling at least one Steam Assisted Gravity Drainage (SAGD) parameter in a leaky bitumen reservoir. Further, a process to control a steam injection rate for an individual SAGD well pair, in a leaky bitumen reservoir wherein the process replaces a pressure control for an SAGD steam injection rate with a volume control determined by a Water Recycle Ratio (WRR).


Patent
Nexen Inc. | Date: 2013-06-27

A method to operate a Steam Assisted Gravity Drainage with Oxygen (SAGDOX) process, in a leaky bitumen reservoir, wherein the process includes start-up, growth, decline and shut down phases. The start-up phase includes


A Single Well Steam Assisted Gravity Drainage (SWSAGD) process to recover liquid hydrocarbons from an underground hydrocarbon reservoir, wherein the single well includes a single substantially horizontal well including a heel area and a toe area, wherein the toe area of the horizontal well extends upwardly into the reservoir, the process including 1- injecting steam into the reservoir via a steam injection area, proximate the toe area of the horizontal well, 2- allowing the steam to condense causing heated hydrocarbon liquids and water to drain into a liquid recovery zone of the horizontal well between the toe area and the heel area of the horizontal well, and 3- recovering the heated hydrocarbon liquids to the ground surface from the liquid recovery zone.


Patent
Nexen Inc. | Date: 2013-05-14

A process to utilize at least one water lean zone (WLZ) interspersed within a net pay zone in a reservoir and produce bitumen from the reservoir, includes using Steam Assisted Gravity Drainage with Oxygen (SAGDOX) to enhance oil recovery, locating a SAGDOX oxygen injector proximate the WLZ, and removing non-condensable gases.

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