Abstract: A coupling arrangement having external threads carried on a first pipe element. A second pipe element carries a radially movable locking member with external locking profiles, and a connection sleeve having internal threads that are threaded onto external threads and internal locking profiles that engage with the external locking profiles. The connection sleeve is moved in a first axial direction towards the first pipe element by rotation on the external threads while the internal locking profiles are in an intermediate engagement with the external locking profiles, until the movement is limited by abutting faces of the internal and external locking profiles. At least one of the abutting faces exhibits an inclination resulting in a pull of the connection sleeve towards an axial direction opposite of the first axial direction when the external locking profiles are moved radially.

Abstract: Subsea well assembly having a Xmas tree (107, 207) and wellhead (103). From a tubing hanger (113) a tubing extends into the well. A part of a production flow passage extends vertically from the tubing hanger (113) in a vertical bore (111) of the Xmas tree. A fail close production master valve (PMV) (117) is arranged in the production flow passage. The tubing hanger (113) is arranged below the Xmas tree (107), such as in the wellhead (103). The Xmas tree (107) exhibits a branch (115) that deviates from the vertical bore (111), which branch constitutes part of the production flow passage. The fail close type production master valve (PMV) (117) is arranged in the branch (115).

Abstract: Connection assembly (1) for connecting a first and second pipe end (201, 301) of pipes (200, 300). The pipe ends exhibit outwardly facing pipe locking profiles (203, 303). Locking segments (101) are distributed about the second pipe end (301) and have a connected (103) and a movable portion (105) with segment locking profiles (103a, 105a). The movable portion (105) is pivotable between an inward locking position and an outward free position. Among the pairs of facing locking profiles, comprising a first pair including the segment locking profile (103a) and facing pipe locking profile (303) of the second pipe end, and a second pair, at least one pair exhibits an inclined face (S1, S2, S3) which is misaligned a misalignment distance (M1, M2, M3) with respect to the facing inclined face (P1, P2, P3) of the profile with which it engages.

Abstract: The invention provides a bore protector for a tubing hanger, the bore protector is to be arranged in a tubing hanger in a spool in a subsea production Xmas tree for through tubing rotary drilling (TTRD) in an existing production well. The bore protector is distinctive in that it comprises a means to be releasably fastened in at least one of: the spool in the Xmas tree and the tubing hanger, and a wear sleeve extending down into the tubing hanger, covering the tubing hanger sealing surfaces for the tubing hanger plugs, the wear sleeve comprises a shoulder at or near an upper end, the shoulder is arranged on a below positioned seat of a main part of the bore protector, in which position the wear sleeve is releasably fastened.

Abstract: A gate valve assembly (100) for use in subsea workover systems is disclosed. In an embodiment, the gate valve assembly (100) includes a valve block (102). The valve block (102) includes a cutting gate (204) disposed in a valve cavity (206) such that the cutting gate (204) can engage in a reciprocating motion in the valve cavity (206) between an “open” position and a “closed” position. The reciprocating motion of the cutting gate (204) results in a cutting operation of a tubing conveyed string passing through the gate valve assembly (100). The gate valve assembly (100) further includes a slug pit (202) formed in the valve block (102) alongside the valve cavity (206). The slug pit (202) defines an opening which can contain one or more cuttings from tubing conveyed springs resulting from the cutting operation. The reciprocating motion of the cutting gate (204) transports one or more cuttings of the tubing conveyed string to the slug pit (202).

Abstract: The invention relates to a manifold structure that includes a frame construction (1), a number of pipes (2), a pipe bend and possible valves, deployed in a pipe system having a number of pipe terminations projecting from the frame construction. The frame construction (1) is designed with a number of support brackets (5) for respective coupling parts associated with said pipe terminations. Each support bracket (5) is made as a separate, standardized unit that includes several securing means for releasable assembly to the frame construction, where each securing means is arranged for defined adjustability in height and lateral direction for adaption to a preinstalled pipe termination.

Abstract: Subsea pressure booster comprising an electric motor (2) and a compressor (3), multiphase pump or pump driven by the electric motor, for boosting the pressure of a subsea flow comprising petroleum gas or liquid, distinctive in that the pressure booster comprises a common pressure housing (1) for the electric motor and compressor, multiphase pump or pump; a diaphragm separating the common pressure housing into two compartments, one compartment for the electric motor and one compartment for the compressor; multiphase pump or pump; a shaft connecting the electric motor to the compressor, multiphase pump or pump; and at least one oil lubricated mechanical shaft seal arranged between the shaft and diaphragm; and bearings on the shaft, preferably at least two radial and one axial oil lubricated bearings (4, 4?, 4?) for an oil filled or gas filled motor compartment or magnetic bearings or oil lubricated bearings for a gas filled motor compartment.

Abstract: A clamp connector emergency release tool designed for subsea operations, when normal release of a subsea clamp connector (14) is not possible, is shown and described. The tool is adapted to be handled and operated remotely by a work class ROV tool. The tool includes a clamp connector (14) adapter housing (7) arranged to engage with and connect to the clamp connector (14) body, a rotatable hole saw (11) mounted on the housing (7), a rotary motor (1) in driving connection with the hole saw (11) and a piston (3) and cylinder assembly (4,5). The piston (3) and cylinder assembly (4,5) enables advancing the rotatable hole saw (11) into the clamp connector (14) body around its jack screw, in order to separate the jack screw together with a threaded portion of said clam connector (14) in order to separate the jack screw from the clamp connector (14) body.

Abstract: A seal holder for retaining a sealing arrangement (119,121), said sealing arrangement (119,121) being adapted to seal against a facing seal surface (209) in a bore (203), said seal holder having an intermediate section (117a) encircled by a peripheral section (117b) arranged for carrying said seal arrangement (119,121), wherein said intermediate section (117a) is convex shaped towards the pressure side and is adapted to exert radial pressure on said peripheral section (117b) in the event of exposure to pressure on its convex side. The invention also relates to a method for sealing a bore by applying an apparatus equipped at its lower end with a seal holder (117) retaining a sealing arrangement (119,121).

Abstract: A subsea valve comprises a valve gate (4) moveable within a valve cavity (3) and a main passageway (2) extends transversely of the cavity. At least one annular valve seat (6) is in communication with a respective portion of the main passageway and extends to engage the gate. An annular pocket (7, 7a) accommodates an end of the respective seat remote from the valve gate. The seat has at the said end an annular buffer (54) in radial engagement with the pocket (7) and comprising a multiplicity of cantilever springs (55) each extending radially and circumferentially of the rim of the seat.

Abstract: A connector assembly for connection to a tubular element. The connector assembly includes locking elements with locking profiles, movable in a locking and an unlocking direction. The locking profiles can lock with facing locking profiles of the tubular member. The locking elements can be moved in the locking direction as a result of movement of an activation sleeve in a first direction. The locking elements or the activation sleeve include guiding elements that are adapted to slide against inclined unlocking guiding surfaces of the activation sleeve or the locking elements. Movement of the activation sleeve in a second direction results in movement of the locking element in the unlocking direction. The activation sleeve has axially extending activation sleeve protrusions having spaces formed between them.

Abstract: This invention relates to a pump system, especially for boosting the flow rate of a fluid through a pipe (1, 2, 6), comprising a pump positioned in a pump chamber (10) for pumping at a chosen rate, and a motor driving said pump, the motor being positioned in a chamber (9) being provided with a pressurized fluid, the pressure of which being higher than the pressure in the pump chamber, the motor and the pump chambers being separated by a seal (8), the seal allowing a leakage of said pressurized fluid between them, wherein the pressurized fluid is acceptable to the pump environment and the system comprises a discharge branch line (3) coupled to the pipe(6) and positioned downstream from said pump, the discharge branch line having an outlet into the environment.

Abstract: A “boltless” locking arrangement for secure attachment of a boss to a fixed structural part is shown. The boss has a central axis and is extending substantially perpendicular to the plane of the structural part when the parts are assembled. The arrangement includes two substantially radially extending, when viewed relative to the central axis, action surfaces provided in the external surface of the boss, and at least one annular plate configured body made up by individual segments. The at least one annular plate configured body is at its radially inner, but external portion designed to co-operate, or engage with, at least one of the respective two action surfaces, and at its radially outer, but internal portion and on opposite side, is abutting the fixed structural part.

Abstract: A method of transmitting on a transmission line a set of carrier signals of which at least one component represents a respective data value and the carrier signals are of different frequencies ranging from a lowest frequency to a highest frequency, in which the respective component of each carrier above the lowest frequency is adjusted on transmission in accordance with a selected relationship between that respective component and the corresponding component of the next lower frequency so as to compensate for the frequency-dependent effect of the transmission line on those components. The components may be amplitudes. The relationship may be a ratio of the respective and corresponding components.

Abstract: A subsea wellhead a generally cylindrical body including a lower extension for forming an annular space for a cement column between the lower extension and an outer conductor. The extension carries a multiplicity of interfitting rings forming a sleeve which facilitates flexure of the extension in the presence of the cement column. Each ring may comprise an inner flange for disposition adjacent the outside of the extension and an outer flange for fitment over the inner flange of an adjacent ring. The outer flange may have a radial through-bore.

Abstract: A well head system for application in sub sea well exploration comprising a well head (23) having a well head housing secured to a well casing, at least one valve stack, e.g. a BOP (1) located atop said well head (23). The valve stack is removably locked on a well template (15) supporting said well head by a plurality of locking devices (7). Also described is a locking device comprising two opposite clamping arms (19) hingedly attached to a main frame (21). The Main frame is slidable relative to a spindle (17) and can be selectively secured to the spindle (17).

Abstract: A releasable guidepost extension is used on the seabed together with a bottom fixed guidepost part. These parts make up a guidepost for use during the lowering of a component from the surface of the water to a subsea structure. The guidepost part includes an upward (in use position) projecting end designed for engagement with a lower (in use position) end of the guidepost extension. The guidepost extension is loosely connected to the bottom fixed guidepost part via a pin and socket part on respective ends. A gap, or clearance, exists between the pin and socket part in the longitudinal direction, and at least one friction forming device arranged in the gap on either the pin part or in the socket part. The friction forming device does not get in contact, or engaged, with the other part unless the guidepost extension is subjected to a lateral force.

Abstract: A modem for use with a subsea transmission line comprises a digital signal processor responsive to a succession of segments of a data signal to produce a respective set of orthogonal frequency division multiplexed signals and to transmit those signals as a burst on the transmission line, and to prepend the burst with a start signal comprising a cyclically time-varying signal envelope-modulated with a Gaussian waveform. The modem is also arranged to convert signals received from the transmission line into a succession of digital samples and to process those samples to obtain an indication of the peak of the Gaussian waveform whereby to provide a datum for decoding a received burst of OFDM signals.

Abstract: An actuator with a predetermined failure mode includes two carriers which are each moveable in a common direction. A detent is engageable to couple the carriers to move in unison. An electrically operated actuating device causes extension of the toggle linkage to operate the detent and collapse of the toggle linkage when de-energized. There is a prime mover for the first carrier and a return mover for causing return movement of the second carrier on the release of the detent. In an example, the detent includes a pivoted arm disposed on the first carrier and positioned to engage a part of the second carrier; and the toggle linkage includes a pair of relatively pivoted links connected between a pivot on the first carrier and a pivot on the arm.

Abstract: Subsea anchor (1) having a hollow cylindrical body (3) extending down from a top part (13). The anchor has a top aperture (15) and a top hatch (17) which is adapted to close and open the top aperture (15). The cylindrical body (3) is adapted to penetrate into a seabed. The area of said aperture (15) is at least 30% of the corresponding cross section area encircled by the cylindrical body (3).