Abstract:
The invention is a method of producing a valve block by- powder moulding in a Hot Isostatic Pressing (HIP) process. A sheet mould 1 A/B with filling sprues 2 A-H is made, which is filled with metal powder through the filling sprues, vacuumized and sealed. The mould is placed in a HIP processing container for high-pressure inert gas, such as argon, at high temperature, such as 1100 °C, to be supplied for processing into a compact and homogenous material. Finally, the blank is worked externally and internally to its final design by surfaces being machined.
Abstract:
The invention consists of a cylindrical hollow stuffing box (1) for accommodating geometrical differences between rotating, passing drill pipes (B) and pipe connectors (B' ') the diameter of which exceeds that of the drill pipe. The stuffing box (1) consists of an outer housing (2), an upper ceramic disc (3) with an upper set of sipes (4), a lower ceramic disc (5) with a lower set of sipes (6), an outer packer (7) and an inner packer (8) surrounded by an annulus (9). The inner packer (8) seals against the drill pipe (B) such that the packer (8) during operation rotates together with the passing drill pipe (B). The discs (3,5) are fastened to top and bottom of the housing (2) and have an opening, the diameter of which exceeds the diameter of the pipe connectors (B' '). The packer unit with the integrated sipes (4,6) will also be rotated by the drill string during operation, as the sipes (4,6) abut the discs (3,5). When the pipe connector (B' ') is to pass down through the stuffing box (1), then firstly the upper sipes (4) and then the packer (8) will be forced out into the annulus (9), and as soon as the pipe connector (B' ') has passed the upper sipes (4) these will be forced back by the pressure in the annulus (9) whereafter the lower sipes (6) are correspondingly activated.
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.
Abstract:
A device for an inert gas installation (5) on a floating vessel, comprising one or several tanks (1) arranged in a manner allowing filling of an explosive liquid (11) via suitable means (13, 14) associated therewith, and/or a gas (12), wherein an air inlet system (3) is connected to the tank (1), wherein the inert gas installation (5) is provided with a shutoff valve (51) arranged to automatically allow closing of an inert gas supply conduit (52), wherein the tank (1) is provided with a sensor (53) arranged to respond to a defined, ambient moisture and pressure level, the sensor (53) also being connected to a valve control system (7), thereby providing control signals to the valve control system (7). The invention also concerns a method of using the device.
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.