Abstract: A transducer for arranging in a fluid particularly for the measurement of the flow velocity of a fluid in a pipe by transmitting/receiving sonic pulses, is designed as a cupshaped metal body (5), whose base (2) as membrane (3) is assigned an electrode (4) on its inside, which is sealed off against the environment i.e. against the fluid, and whose cup wall is designed with an annulus (6) filled with a powerful damping material (8), for example epoxy, rubber or epoxy mixed with metal particles.

Abstract: Device with valve function which can be brought into and out of a pipeline and parked in the same. The device comprises a channel for throughflowing fluid, a valve (2) which is medium controlled and/or remote-controlled, a parking brake/packer seal unit (9) which with limited force can be brought to bear against the wall of the pipeline, a cylindrical wire anchor (1) with an external diameter which is slightly lesser than the internal diameter of the pipeline and can be brought into pressure contact with the pipeline.

Abstract: Hydraulic cement slurry for use in cementation of oil wells containing hydraulic cement, 5-100% microsilica based on the weight of cement, 2-200% light weight aggregate with a real particle density between 0.1 and 1.5 g/cm.sup.3 based on the weight of the cement, 0-5% thinner (dry weight) based on the weight of the cement, 0-10% fluid loss additive (dry weight) based on the weight of the cement, and water in such an amount that the cement slurry has a density between 0.8 and 2.0 g/cm.sup.3.The cement slurry according to the present invention is gas tight and can thereby be used for cementation of oil well in fields having gas containing formations.

Abstract: A transducer system and method is provided for ultrasonic measurement of the flow velocity of a fluid in a pipe. Two transducers are mounted on opposite sides of a pipe, the second transducer being downstream from the first. The two transducers alternately transmit and receive ultrasonic pulses along respective center axes which are deviated upstream from an imaginary line connecting the transducers.

Abstract: A mono-atmospheric chamber module for placing on the top of a Christmas tree (1) in a well-head, to keep equipment and personnel at surface conditions during the execution of varied well operations. The chamber module comprises a mainly oblong cylindrical mantle (4) with associated base-ends. An opening (7) for tight engagement with the top of the Christmas tree (1) is arranged in the lower base-end (5). The upper base-end (6) is detachable. Inside the module, a pressure resistant personnel chamber (14) is arranged with direct connection to an access opening (19) placed in the cylinder mantle (4).

Abstract: Access apparatus between a first and second chamber (1, 2) located at greater water depths, which chambers have equal pressure, lower than the water pressure, particularly an access apparatus (4) between an underwater vessel (1) and a chamber (2) at an installation on the seabed. The invention is characterized in that it comprises first and second concentric tubular elements (7, 5) designed for engagement as a telescopic cylinder, a hydraulic system for controlled actuation of the telescopic cylinder and at least on the free end of the first tubular element (7), a spherical mounted mating flange (12).

Abstract: A method for determining the position of a marine seismic receiver cable of the type which is towed behind a seismic survey vessel through the sea, wherein the azimuth and the distance from the vessel to points along the seismic receiver cable are measured, and the coodinates of these points are calculated on the basis of these values. A hydroacoustic measurement method is utilized, based on a super-short baseline system integrated with a gyrocompass, for measuring the azimuth and distances in accordance with signals from transponders, beacons, responders and/or similar instruments installed on or within the seismic receiver cable.

Abstract: An apparatus for carrying out operations under water having a twin hull autonomous submarine which in the space between two pressure hulls is provided with a cargo hold having an apparatus for receiving and carrying cargo units. The compartment between the pressure hulls is outwardly limited by inward hatches in the submarine's hydrodynamic outer hull (form hull). In the hold longitudinal running levels on both of the pressure hulls for at least one traverse crane and at least one cargo carrying wagon, as well as, preferably, a belly manipulator. The apparatus is used to carry out various operations in an underwater production system.

Abstract: Cementing apparatus to be used for well cementing operations comprisingan intermediate casing (10) which features one or several cementing ports (12),a main tool (21) with one or several cementing channels (22) located with their outlets aligned with the cementing ports (12),a main sealing sleeve (13) and an auxiliary sleeve (17) that features one or several port openings (15, 19),the main sealing and pilot sleeves (13, 17) as a unit in an initial lower position closing the connection between the cementing channels (22) and the cementing ports (12), and forming the said connection in a second vertically shifted position through the port openings (15, 19). A procedure for execution of a cementing operation.

Abstract: Self-driven vehicle for pipelines comprising: a cylindrically designed vehicle body (1) through which and/or around which the pipeline's (10) medium flows, a drive unit (2) on the vehicle body (1) which resiliently bears against the pipeline's (10) internal surface, a hydraulic system which powers the drive module (2), a power supply system for operation of the hydraulic system, and a controller (22) which at least controls the vehicle's movement in the pipeline (10).

Abstract: The shut-off device is a hollow cylinder upon which is disposed a brake for fixing the position of the device in the pipeline and a seal which seals the area between the hollow cylinder and the wall of the pipeline. A valve is positioned in the hollow cylinder which allows flow of the pipeline fluid through the hollow cylinder when open but can be closed to stop the flow of pipeline fluid through the cylinder. The device is movable through the pipeline.

Abstract: A device for clamping and locking of cover (6) against a flange (7) for subsea installations, particularly in connection with production of oil and/or gas, and particularly for clamping and locking of a valve housing cover (6) against a flange (7) on a valve housing (9) which is coupled into a subsea pipeline (1). Mainly U-formed locking segments (4) are designed with a certain clearance, preferably approx. 3 mm, so that the distance between the opposite facing, parallel contact and sealing surfaces of the locking segment (4) exceeds the total thickness of the cover (6) and flange (7) .

Abstract: System for the transport of an unprocessed well stream comprising a multiphase, multicomponent mixture over long distances from one or several subsea wells A to a terminal F. The well stream, which is transported in one or several pipelines (10), running via at least one well A and to the terminal F, is supplied transport pressure by means of one or several fluid driven pumps (26) in the vicinity of the wells and/or fluid driven pipeline pumps (27) along the pipelines.

Abstract: A subsea flowline connection system wherein a terminal connector on a flowline is pulled by a cable into a funnel on a connector base structure. The upper and lower 5 surfaces of the terminal and funnel cooperate to align the component in the vertical plane. The terminal has curved vertical sides which make only line contact with straight vertical walls in the funnel to deliberately allow limited, misalignment (.+-.6.degree.) between the components in the horizontal plane as the terminal is drawn into the funnel. Securing device is then installed between the misaligned components to lock them together in that position. A pull-in tool is provided which is lowered onto the base and includes a pull-in cable for drawing the terminal into the funnel and a device for installing the securing device which lock the components together.

Abstract: A device for carrying out works under water includes a twin hull submarine (1,2) which can be combined with a number of specially adapted cargo modules (12), in which the twin hull submarine between its two hulls (1,2) is provided with a cargo holder (15) for carrying cargo modules in the compartment between the two hulls (1,2). This provides a modularized system for subsea operations, whereby a twin hull submarine, in combination with a number of specially adapted cargo modules, forms a device for carrying out various tasks under water.

Abstract: A connector device for an underwater pipe system which comprises one or m conduits, for connecting pipe sections together or to valves, well heads or similar, whereby such a pipe section comprises an end flange (2) which can be introduced into grooves extending in the transverse direction of a housing (1) by mutual movement of the pipe section and the housing transversely of their longitudinal direction, said housing containing an axially shiftable sleeve unit (7) having a through going duct for each conduit, and said device comprising means for biasing the end flange against surfaces in the grooves. In order to achieve sealing the sleeve unit or units (7) are equipped with at least one main sealing ring (13,19) for each duct, adapted to be pressed against a seat (15) on an end flange, and the sleeve unit or units are locked against rotation and have external threads which cooperate with internal threads in a socket (6) which partly surrounds the sleeve unit or units (7).

Abstract: "A breathing system for divers includes a breathing bag (211) from which the inhalation gas to the diver is delivered and to which the exhalation gas from the diver is supplied, a compressed gas source for the supply of breathing gas, and a pneumatic cylinder/piston unit (308, 209) operatively connected to the compressed bag source and having the piston (209) coupled to the breathing bag (211) to contract or expand the bag. A sensor responds to pressure variations in the breathing gas caused by the diver's inhalation and exhalation, and causes at least two valves and associated controls (173-205) to switch the compressed gas source to either side of the piston (209) in the pneumatic cylinder (208). The valves (176, 177) ensure that the breathing gas to and from the diver is maintained at a pressure approximately equal to the ambient pressure.

Abstract: A servicing apparatus for installing a piece of equipment horizontally on a submerged unit and for removing it therefrom, comprises a movable servicing module designed to engage on the upper part of the submerged unit, pivot thereabout and lock against it in a horizontal position, and a cradle supporting the piece of equipment. The cradle is carried, by means of connections allowing transverse adjustment, by sliding supports mounted in the servicing module, and movable longitudinally by means of jacks. Mutual engagement means are provided on the submerged unit and on the piece of equipment to ensure that the latter is positioned accurately on the unit.

Abstract: System for development and exploitation of oil and or gas fields offshore, including drilling and the employment of a gravity platform (6). An elevated foundation (2) is established on the seabed (1) for placing of a predrilling template (7) on top (3) of the foundation, preferably a rock-fill foundation. One or several wells is predrilled from at least one cavity of the predrilling template (7), after which a gravity platform is placed on the foundation (2), at least one of the shaft of which platform being downwardly open and arranged for cooperation with the predrilling template (7). After installation of the platform drilling-, production- and living quarter modules (16, 17, 18) are placed on the platform deck (15). Water is pumped out of the shaft (11) and the cavity in the predrilling template (7), in this way providing a dry 1-atmospheric chamber at the base of the platform where operations like connecting wells to conductor pipes etc. may take place.

Abstract: A ball valve device for subsea applications, capable of being dismantled for inspection and maintenance without disrupting normal operations of the pipeline and without causing leakage into or out of the pipeline is disclosed. The ball arrangement of the valve has an upper ball member (3), and a lower ball member (4) in which its upper ball member (3), includes the main packings of the valve. The lower ball member (4) includes two axial withdrawable sleeves (13). When the valve is open, the sleeves (13) can be withdrawn outwardly for intervention with guiders in the valve housing (1) and thereby form a tight, continuous passageway which extends from one of the openings in said valve housing (1) to the second opening in said valve housing (1). The axial withdrawable sleeve (13) can be moved inwards to a position where it stands free from its other guiders when said ball arrangement rotates during closing of said valve.