National Oilwell Norway As

National Oilwell, Inc.

Kaarbos Mek. Verksted A/s

National Oilwell Varco, L.p.

Magne Mathias Moe

Per Olav Haughom

Age Kyllingstad

Åge Kyllingstad

Jørn Pollestad

Robert Lewis Bloom

Hege Kverneland

A tensioning device () for a riser () connecting a subsea borehole () with a floating installation () on the surface of the sea (), where the tensioning device () is provided with telescoping tubes (') and also several evenly spaced hydraulic cylinders (&#x2032;) arranged in a peripherally encircling manner and mainly in the longitudinal direction of the riser, and where the tension in the riser is exerted through hydraulic pressure in said cylinder (&#x2032;), the tensioning device () consisting of two successive, interconnected telescopic tensioning units (), the tensioning units () being designed separately to maintain a prescribed tension in the riser ().

Two-part telescopic tensioner for risers at a floating installation for oil and gas production

A valve arrangement for reciprocating machine, where the arrangement () comprises an in-valve () and an out-valve (), each valve (), () being a springloaded one-way valve designed to open for flow when the pressure differential in the direction of flow provides a force that exceeds the spring tension, wherein the valves () are mounted in a casing () that forms or is connected to the cylinder head of the reciprocating engine (). The in-valve () and the out-valve () are mounted in a sleeve () designed to be fitted in a bore () in the casing (), and where fluid may flow to the sleeve () from an inlet () in the casing () and into the sleeve () via the in-valve (), and where the sleeve () is provided with at least one perforated area where fluid may flow radially out of or into the sleeve () via holes (), thereby flowing to or from a passage () that forms a perpendicular or near perpendicular connection with the bore ().

Valve arrangement for reciprocating machinery such as a pump and an compressor

A device for a single-acting hydraulic cylinder () designed to lift or pull a load upon the existence of an oil pressure on the rod-side of a cylinder piston (), where the cylinder bottom () of the hydraulic cylinder () is provided with a drainage outlet () for leakage fluid, as well as an air inlet ().

Draining of oil leak in a hydraulic cylinder

An apparatus and method for protecting against the problems associated with heave of a floating drilling rig are disclosed. The disclosed invention is a unique inline compensator in which a plurality of cylinders housed within a tubular housing and a plurality of low pressure and high pressure accumulators function together to provide a system for compensating for heave in the event a primary heave compensation system fails or becomes inoperative. The typical inline compensator of the present invention utilizes a plurality of hydraulic cylinders that act in opposite directions and that have different piston areas such that the piston rods of the cylinders are extended or retracted at different pressure levels to account for heave. The typical inline compensator of the present invention is self-contained and compact enough to fit in the limited space available on a floating drilling structure. Further, a pair of inline compensators of the present invention can be utilized with coiled tubing operations. In such a case, the inline compensators will not interfere with the tooling necessary to conduct the coiled tubing operations.

Inline compensator for a floating drill rig

A device for tensioning and relieving production tubing () extending from a subsea hydrocarbon well () up through a riser () to a floating installation (), a continuous production tubing extension () passing through a telescopic unit () in the upper part of the riser (), preferably extending above a production deck () on the floating installation (), where the production tubing () is provided with a tubing tensioner unit () below and in the proximity of the lower end of the telescopic unit ().

Tensioning system for production tubing in a riser at a floating installation for hydrocarbon production

In spinner tongs, a so-called spinner (), incorporated in an iron roughneck and thus serving to rotate a drill pipe during connection thereof to a drill string or during division of the drill string into individual pipes, the aim has been to reduce damage on the threaded connections (the pin-and-box joints) in the screwing/unscrewing operations. This is realised in an operation for the simultaneous centering and rotating of the drill pipe. Four spinner rollers () known in themselves, which are brought to bear on the drill pipe when surrounding it, are mounted according to the invention, preferably in pairs, at the outer ends of driven clamping arms (), by bogies (). At their opposite outer ends the clamping arms () are pivotally supported on a fixed frame part/structure () and are jointed to each other by means of a piston and cylinder () driven by pressure fluid and arranged to carry the clamping arms () towards and away from each other. For their forced centering the clamping arms () have a centering stay () arranged thereto, which is connected by its outer end to one clamping arm (), and is connected by its other outer end to the other clamping arm (). For the parallel displacement of the rollers (), each bogie () has a parallel stay () arranged thereto, whose other end is supported on a fixed frame part/structure ().

Drill pipe spinner device

A piston engine in the form of a piston pump or a piston engine (motor) comprises two or more piston cylinders (), preferably positioned with the same angular distances of 180 degrees for two cylinders, 120 degrees for three cylinders etc. with regards to an axis, and each comprising a reciprocating piston with a projecting piston rod (). Via the piston rods (), each piston is given a controlled displacement matched to the controlled, given displacement of another or other pistons. The control means is rotatable and influences the projecting outer end portions of the piston rods or parts fitted to these, for instance rotatable rollers (). By a piston pump of this type, the pistons are to contribute to impelling a fluid flow, while a piston engine of this type shall be designed to be driven by a fluid flow. Operating conditions are aimed at which give a more even volume flow, i.e. without any significant fluctuations. For this purpose, said rotatable control means is designed with an encircling cam surface () which the piston rod ends abut via the peripheral surface of said rotatable rollers (). According to a feature of a method associated with the application of such a piston engine, each piston may with advantage be driven at a constant speed through part of its power stroke.

Arrangement at a piston engine and method of controlling the pistons

Arrangement for measuring tension loading in wires. A winch has a foundation-forming, first base member and a second base member permanently connected to the former member by way of shanks disposed therebetween. A support arm is mounted in between the base members with connection therewith on opposite sides of a gap formed by the shanks. A cell is arranged in the support arm for determining tension or pressure forces by measuring mutual movements of the second base member relative to the first base member. An indicating device is electrically connected to the cell enabling measured results to be displayed as an expression of the tension loading in the wire.

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Harstad, Norway

Magne Mathias Moe