Abstract:
The invention relates to a method for two-step separation of water, salt and particles from a hydraulic fluid by the use of a control unit (1). The hydraulic fluid is carried into a reservoir oil tank (4) with an electrostatic coalescer (3) provided with a high- voltage transformer (2) with direct current to two electric grids (43, 44) whose electrostatic field gathers water into drops which settle into a collecting tank (5). The hydraulic fluid is circulated to a filter module (9) for removing any remaining water, salt and particles in filter elements (92) connected in parallel, having hygroscopic cellulose fibres which swell until saturation, the swelling being measured by a sensor (93) measuring the degree of saturation, alternatively conductivity.
Abstract:
An actuator for a pilot for a hydraulic control valve including a direct-current servo-motor (1) provided with a high-ratio gear (4) and arranged to be operated by a battery (2) with an associated battery charger (13), and an oil return port (10), a pilot port (11) and a hydraulic supply (12) and via the gear (4), the servo-motor (1) is arranged to move a valve stem (5) which bears via a first valve ball (7) on a spring-loaded pilot needle (8) which bears, opposite the first valve ball (7), on a second spring-loaded valve ball (7), a spring and a return spring (9) being arranged to move the valve balls (7) towards the pilot needle (8), and a microprocessor with an associated controller (3) being arranged to determine the position of the valve stem (5) by registration of the rotational position of the servo-motor; and, if a control signal is interrupted, the controller (3) is arranged to drive the valve stem (5) into a predetermined position by means of current from the battery (2).
Abstract:
The invention relates to a method of condition-monitoring hydraulic accumulators (4A/B). The gas content of the accumulators (4A, 4B) is monitored by the gas volume being calculated on the basis of the weight and working pressure of the accumulators. The working pressure of the accumulators and a relevant operational history are recorded with an electronic logging system (8) which stores data for use in connection with condition-based maintenance of the accumulators.
Abstract:
A device for a valve actuator (1) is described, the valve actuator (1) being provided with a slide nut (5C) surrounding a portion of an actuator slide (3B) and being in engagement with an external threaded portion arranged on the actuator slide (3B), the slide nut (5C) being axially fixed relative to the actuator slide (3B), and the actuator slide (3B) being in rotation-preventing engagement with a portion (5F) of an actuator mounting (5A) or a valve housing (2A), and the slide nut (5C) being connected to a driving motor (5K, 10) via transmission means (5H, 51, 5J; 5H, 6C, 6D, 6E). Also, a method of operating a valve (1) is described, the method including the step of: providing an axial displacement of the actuator slide (3B) by rotating a slide nut (5C) which surrounds a portion of an actuator slide (3B), is in engagement with an external threaded portion arranged on the actuator slide (3B) and is axially fixed relative to the actuator slide (3B), the rotation being provided with the help of at least one driving motor (5K, 10).
Abstract:
The Invention concerns a permanent subsea sampling and analysis system (1), which typically is integrated into a replaceable equipment module for a choke valve (2) of a subsea production well. The analysis system (1) separates a sample into liquid fractions consisting of crude oil, condensate and produced water and then measures the salinity of the water as well as the volumetric ratio between the liquid fractions. With this equipment it will be possible to check, at regular intervals, the development in salinity of the produced water from a singular well without disturbing the production from the well. The information from the analysis system (1) may be used to update the calibration set-up of the multiphase flow meter of the well, or to reveal a possible water breakthrough resulting from water injection into a reservoir, or for other reservoir analyses. Due to the analysis equipment becoming permanently installed on the subsea well equipment, costs of taking samples via intervention operations from vessels are avoided, also avoiding temporary shut-down of production from other wells producing to a joint subsea manifold for the purpose of investigating which well may possibly have experienced water breakthrough.
Abstract:
The invention concerns subsea power generator with a pressure-reducing turbine provided with a closed turbine and generator, wherein flanges on the inlet side (4) and the outlet side (5) of the turbine are connected to a piping system in a well stream. The turbine is provided with two meshing gear wheels (6, 7) disposed transverse to the well stream. A deflector plate (8) disposed at the inlet (4) splits the well stream so that the well stream is directed toward the outsides of the two gear wheels (6, 7) driving the gear wheels (6, 7) in opposite directions of rotation. A power generator (16) is supplied with the total torque via a shaft (10) connected to one of the gear wheels (7) and supported in a roller bearing (12). The unit is designed to cause a large pressure drop, is disconnectable and can be pulled to surface.
Abstract:
The invention relates to a stuffing box (1 ) consists of an outer housing (2), an upper set (3) and a lower set (4) of support plates for a sleeve-shaped, flexible sealing element (5) enclosed by a liquid filled, pressurised annulus (26). The sets of support plates in the top (22) and bottom of the housing (24) respectively have an opening in the middle, exceeding the diameter of the tool joint (B"). The inner sealing element (5) seals radially against the drill string (B) and axially against the support plates with pressure assistance from the annulus (26) between the sealing element and the middle stuffing box housing. When the sealing element (5) is rotated by the drill string (B) the ends of the sealing element (5) abut the upper and lower support plate set (3, 4) respectively and seals against the pressure from the well and outside seawater pressure. Each of the upper and lower support plate sets (3, 4) comprise two halves (31, 33; 41, 43 respectively) connected to an actuator each (32, 34; 42, 44 respectively) arranged for radial displacement of the halves (31, 33; 41, 43). Each of the support plate halves (31, 33; 41, 43) comprise a cut-out arranged to be able to encircle the inside and the ends of the sealing element (5) comprise cast-in, ceramic elements.
Abstract:
A pressure reduction turbine (1) for a hydrocarbon well stream driving a hydraulic pump (2), and the turbine has two cog wheels (1A, 1B) mounted laterally to a well stream. A deflector plate (1L) is positioned at the well inlet to split and direct the well stream towards the outsides of the cogwheels and to drive them with opposite rotation. The turbine is designed to give a large pressure drop. Ceramics is used in the turbine housing (1C), in the turbine inlet (ID) and in the turbine outlet (1H), to withstand erosion wear. A hydraulic pump (2) is supplied with collective torque via the turbine shaft (IE), supported by two journal bearings (IF and IN) and is connected to the pump via a dynamic sealing arrangement (3). Alternatively the torque from the turbine may be transmitted by to the pump without the dynamic seal, via a magnet coupling. In an underwater implementation the turbine 1 with the pump are equipped with an arrangement for connection or disconnection via an underwater tool system, so that the equipment may be pulled and installed from a surface vessel. The hydraulic pump leads hydraulic oil at high pressure out into a piping system (6) where hydraulic energy, possibly from several such power sources, is led to a common hydraulic motor (7) driving an electric generator (8). In a surface implementation the generator is positioned in a non-explosive environment, for example in an overpressure container (11).
Abstract:
The invention relates to a method for measuring and controlling a fluid flow in a pipe system for liquid transport, such as oil flow during buoy loading, wherein there in each end of a the pipe system is spliced in a sensor (1) consisting of a pipe section (2) with a reinforced rubber bellows (3) positioned as a restriction within the transport pipe. The rubber bellows (3) is forced radially outward when there is oil flowing through the transport pipe, and compresses a gas filled volume in a pressure vessel (4) via a pipe connection (4B) in communication with an annulus (5), and a pressure transmitter (6A/B) gives signals to a control system (7). The sensor (1) on the platform and the tanker vessel measures relative changes in the liquid flow between the two measuring points, as the measurements from the tanker vessel is received via a telemetry system, and the signals from the two measuring points are compared continuously by the control system on the platform, which triggers an alarm and shuts down the loading process automatically at deviation in the measurement on the tanker vessel compared to the reference measurement on the platform.
Abstract:
The invention concerns a method of producing various massive blanks of encapsulated pipe connections by pressure moulding metal powder material, such as an encapsulated manifold (1) on a base plate (2). In an open mould of steel plates are installed a planned network of both curved and straight pipes (4) both for fluids, via a series of control valves (3) to a control module for hydraulic couplings, and for through pipes (5) for couplings for hydraulic and electrical distribution. From holes in the mould walls pipe ends are extending, which are sealed to the holes in the mould plates. External plates entered on to pipe connectors and locked before the HIP process hold the geometry of the piping network. When the network of pipe and cable connections is estab¬ lished, the top plate is sealed to the mould. A flexible steel bellows is fastened to the top plate, and is used to fill the mould with casting powder and for replenishing to eliminate volumetric shrinkage in the mould during the HIP process, whereafter the mould is removed, and the cast blank is machined before external pipe network and cable connections are connected.