Abstract: A method for isolation and quantification of naphthenate forming acids (ARN-acids) in crude oils is disclosed. The method involves selective absorbtion/adsorption of ARN acids by a solid medium. Isolation of the solid medium and transferring the ARN acids to an organic solvent which can by analysed for its ARN acid content.

Abstract: A process for absorption and desorption of CO2 from an flue gas comprising feeding the flue gas into a mainly horizontal channel (20, 22, 249 where an absorption fluid is spray in to the channel in the flow direction of the flue gas and collected as CO2 rich absorption fluid at a lower part of the channel and transported into the centre of a rotating desorber wheel (30), where the CO2 is desorbed and the lean absorption fluid is returned to the channel is disclosed. This process can be utilized with absorption fluids with high concentration of conventional amine CO2 absorbents. Disclosed is also the use of an amine absorbent in a concentration of between 61 and 100% by weight for the absorption of CO2 from a gas stream, where the amine is an alkanol amine.

Abstract: Disclosed is a method for capturing C02 from a gas stream (10) by introducing droplets of an absorption liquid (15, 17, 40) into the gas stream mainly in the flow direction of the gas. According to the invention, CO2 is captured from the gas stream during a capture phase by means of the absorption liquid droplets, where the absorption liquid droplets are airborne during the capture phase, absorption liquid droplets are introduced into the gas stream with a velocity high enough to ensure internal circulation inside the absorption liquid droplets, and the absorption liquid droplets are introduced into the gas stream with a Sauter mean diameter in the range of 50 10E-6 m-500 10E-6·m. An apparatus suitable for conducting said method is also disclosed.

Abstract: A system for desorption of CO2 from an absorption fluid includes a cylinder with an open inner core, a reboiler including a stripper unit arranged between the inner core and the circumference of the cylinder, where the reboiler including the stripper unit is rotatable arranged around an axis through the core, where the system further includes a condenser rotatable arranged in proximity of the cylinder and rotatable around the same axis, where all the parts of the system are symmetrically arranged around the rotational axis through the core, and where all the fluid paths through the rotational parts of the system are arranged to provide symmetry and weight balance when the system is operational. A method for desorbing CO2 is also provided.

Abstract: A pipeline comprising an outer steel pipe and an internal corrosion resistant covering adhesively joined to the inside of the steel pipe. The pipeline can be taken up onto a drum and later unwound and laid out without any observed deformation of the metal covering. A method for the manufacturing of the pipeline comprises the steps of applying an adhesive onto the outside of the metal covering and optionally also onto the inside of the steel pipe, inserting the metal covering into the pipe and expanding the covering until being in a good contact with the inside of the steel pipe, and curing the adhesive to make the metal covering adhere tightly to the inside of the steel pipe.

Abstract: A method for generating a model of a physical entity, in particular the earth, using one or more hierarchically organized multi-resolutional data trees T, each data tree comprising a plurality of nodes Nk, each node having a grid with a fixed number of points, wherein each node can store an arbitrary number of data items, each holding scalar field values for each point in the grid, the method comprising the steps of creating a geometry using one or more data trees; and creating an associated overlay using one or more data trees, wherein at least one of the geometry and overlay comprises a formula to be applied to data within one or more data trees. This enables manipulation of the data within the data trees during rendering and increases the adaptability of the model without an increase in the required memory space. In preferred embodiments the nodes of the data trees comprise time dependent geo-references to allow the data trees to be time rotated.

Abstract: The present invention relates to a method of improving flow stability for a multiphase fluid flowing through a tubular element (1), comprising arranging a flow control device (2) along a flow path (F) through the tubular element (1), the flow control device (2) comprising a housing (4), an inlet (10) arranged on an upstream side of the control device (2), an outlet (23, 13) arranged on a downstream side of the control device (2), and a movable body (9) provided within the housing (4) along an internal flow path (11) through the control device (2) from the inlet (10) to the outlet (23, 13), the body (9) being arranged such that changes in velocity and/or properties and/or composition of the fluid flowing along the internal flow path (11) result in changes to the forces acting on the body (9) as a result of the Bernoulli principle, thereby adjusting the flow of fluid through the control device (2).

Abstract: The invention provides a process for the production of a lean liquid hydrate inhibitor composition from a rich liquid hydrate inhibitor composition in which the liquid hydrate inhibitor has a boiling point above that of water, which process comprises: (a) feeding said rich liquid hydrate inhibitor composition to a first distillation vessel; (b) withdrawing a water and inhibitor containing vapour from said first distillation vessel and feeding it to a second distillation vessel; (c) withdrawing water vapour from said second distillation vessel; (d) withdrawing a lean hydrate inhibitor composition from said second distillation vessel in liquid form; (e) withdrawing a lean hydrate inhibitor composition from said first distillation vessel in liquid form; (f) withdrawing liquid from said first distillation vessel and removing solids therefrom; wherein the withdrawal of steps (e) and (f) may be of a single liquid stream and wherein at least a portion of the lean hydrate inhibitor composition withdrawn from said fir

Abstract: A method for reversible temperature sensitive control of the flow of fluid in oil and/or gas production, involves a control device or an autonomous valve operating by the Bernoulli principle and includes a moveable disk or body provided within a housing for opening and closing said valve, involving use of the Curie-effect in order to position said body in a preferred position within said housing at a temperature below a certain, preferred transition or Curie temperature. An apparatus for reversible temperature sensitive control of the flow of fluid in oil and/or gas production including a control device or an autonomous valve operating by the Bernoulli principle and including a moveable disk or body provided within a housing for opening and closing said valve, the body and housing including a ferromagnetic material having a certain, preferred Curie temperature, the temperature being selected in order to position the body in a preferred position in the housing during installation or operation.

Abstract: System for mooring a large vessel for production of hydrocarbons, such vessel for example being a FPSO vessel, the mooring system including at least two floating bodies of the hang-off type, moored by means of differentiated compliance spread anchoring system to the sea bed, allowing partly weathervaning of the large vessel; a riser system extending from the sea bed to each the floating bodies, and means for transfer of fluids from the two floating bodies to the large vessel, the floating bodies and the large vessel being provided with locking means, locking floating bodies to the large vessel at the bow and the stern of the vessel in a mechanically rigid manner, thus providing a integrated, rigidly fixed unit comprising the large vessel and the floating bodies.

Abstract: A large diameter subsea gravity separator for ultra deep water conditions of 2000 to more than 4000 m includes a vessel having a shell which defines a cylindrical tubular portion and closure portions at axially both ends of the tubular portion. The shell is a sandwich shell which is dimensioned to provide for a predetermined collapse resistance of at least MPa and includes an inner steel layer, an outer steel layer and a concrete layer completely filling the space between the inner steel layer and the outer steel layer.

Abstract: A device for measuring rates in individual phases of a multiphase flow, such as in flow of hydrocarbon fluid through a pipe line, comprising a venturi having, seen in the flow direction thereof, a first inlet portion with deceasing cross-section, a second intermediate portion with mainly uniform cross-section, and a third outlet portion with increasing cross-section, and being situated within the pipe line. According to the present invention, the venturi is provided with a number of sensors, and the sensors are arranged in mutual distance at different cross-section areas along at least the first of the three portion of the venturi as thereby being able to determine a pressure profile along the venturi as a base for estimating rates for actual rates of the flow.

Abstract: Method to modify an existing subsea arranged oil production well having installed a hydraulically operated downhole valve, characterized in using coiled tubing technology to: arrange an electrically operated downhole pump in the production tubing, lock the hydraulically operated downhole valve in an open position by placing a sleeve body in the open positioned valve, arrange an electrically operated downhole valve above the downhole pump. A modified oil production well.

Abstract: There is described a method of processing fluid from a well. In an embodiment, a fluid processing system is operable to process fluids from a well in dependence on a plurality of controllable system parameters. The parameters are adjusted between respective first and second parameter values, and the first values define a first operational configuration and the second values defining a second, different operational configuration. The adjustment is carried out such that the system is balanced whilst adjusting the parameters. This may be done by adjusting the value of each parameter simultaneously along linear curves from a first initial value to a second end value. In the second configuration, activation or deactivation of a compressor (30) can take place without disrupting the system. The compressor is used to increase the rate of flow of processed fluid from the system.

Abstract: A method is provided for measurement of the thickness of any deposit of material on the inner wall of a pipeline at least partly filled with a medium including hydrocarbons, the medium being for instance oil or natural gas, wherein the method includes: projecting infrared light onto the inner wall of the pipeline along a line corresponding to the intersection between the inner wall of the pipeline and a cross-sectional plane of the pipeline; registering an image of the infrared light projected on the inner wall of the pipeline; and determining the thickness of any deposit of material on the inner wall of the pipeline based on the registered image.

Abstract: Reducing the diameter of a well bore has many advantages. To achieve this a subsurface well bore is provided comprising one or more expandable sleeve components, preferably expandable liners (27, 271), each expandable sleeve component being fully overlapped by one or more non expandable sleeve component, preferably conventional liners (28, 29), such that the interior of the well bore is cased entirely by non expandable sleeve components (28, 29). In addition the through holes (34a) for downhole lines can be provided within the well head (34) rather than the tubing hanger (33). As the tubing hanger does not need to provide space for through holes and associated mounting couplings, its diameter can be reduced, thus reducing the internal diameter of the well bore by several inches.

Abstract: A drill pipe protector assembly comprising at least one protector sleeve (23) adapted to be mounted to the drill pipe string (7) through a fluid bearing (25) so as to be co-axially rotatable with respect to the drill pipe string (7). A retainer arrangement (21, 35) axially fixes the protector sleeve (23) with respect to the drill pipe string (7). The fluid bearing (25) is constructed according to the principles of a hydrostatic fluid bearing. At least one fluid channel (53) connects the fluid bearing (25) to a fluid path of pressurized drilling fluid flowing within an inner space (51) of the drill pipe string (7).

Abstract: A method of modelling a subterranean region of the Earth at a first location comprises the steps of: providing geological data; selecting a plurality of facies; providing a distribution of rock physics probability with spatial dependencies; approximating the rock physics probability at the first location with at least one distribution per facies utilizing the spatial dependencies in the rock physics probability distribution; and performing a Bayesian inversion at the first location using the approximation of the rock physics probability distribution. The method may also employ a window comprising the first location and at least one further location.