41 results about "Offshore pipelines" patented technology

In one aspect, a method and apparatus for intervening in an offshore pipeline while diverting fluid flow to a storage site is provided, so that production through the offshore pipeline may continue while conducting a pipeline intervention operation. An offshore vessel may be used to divert and store fluid flow while intervening in the pipeline. In another aspect, a method and apparatus for drilling a subsea wellbore with an offshore vessel is provided. The method and apparatus involve drilling the wellbore and casing the wellbore with continuous casing lowered from the offshore vessel.

The invention provides a steel pipe vertical seam cutting machine, which consists of a milling cutter 3, a press chain device 5, a speed change gear box 2, a hydraulic motor 1, a guide rail 8, a climbing wheel 7, a chain 4 and an annular plate fixing device 6. The device adopts the mechanical cutting method, eliminates the potential safety hazard for stripping off an outer pipe by oxy arc cutting, omits the cleaning work of an inner pipe, simplifies the construction process, further improves the construction speed of the offshore pipeline leak source restoration, and lowers the construction cost.

A marine pipelaying system and method for installing an offshore pipeline that includes one or more accessories. The system comprises a vessel (1), a pipeline launch device (10) for launching the pipeline (2) from the vessel (1) in the direction of the seabed, and a clamping device (30) adapted to support the weight of the previously launched pipeline. The system further includes an accessory handling device, which is adapted to receive and support an accessory (40) and allow displacement therof between receiving position, wherein the accessory (40) is received by the handling device and a pipeline connecting position, wherein the accessory (40) can be connected to the pipeline (2).

The invention relates to marine pipe laying. For laying of an offshore pipeline, a system is used having a hoisting device. The hoisting device comprises a tower with a tower top side provided with cable pulleys. Furthermore the hoisting device has a traveling block which is displaceably attached to the tower. The traveling block comprises a first block and a second block, both provided with cable pulleys. The first block is provided with a clamp for holding a pipe section to be connected to the pipeline as well as for lowering the pipeline after the pipe section is connected to the pipeline. The hoisting device has a hoisting cable and a winch , the hoisting cable being guided over the cable pulleys on both the tower top side and the traveling block. The traveling block is moveable with respect to the tower by operation of the hoisting winch. The first block and the second block are adapted to be releasably coupled, in which coupled state they can travel along the tower as a unit and are able to support the weight of the pipeline. The second block can be locked to the tower, such that the first block can travel along the tower while the second block remains stationary with respect to the tower.

A marine pipeline installation system for laying an offshore pipeline and/or installing a subsea riser. The system comprises a pipeline guide (20) mounted at an elevated position on the launch tower (10) providing an arcuate guide surface (21) in a vertical plane for guiding said pipeline from the storage reel into the firing line. The system further comprises flexible pipeline end fitting transfer mechanism adapted to transfer an end fitting on a flexible pipeline over the pipeline guide. This transfer mechanism comprises a rotatable transfer arm (60) provided with a first retainer (80) for an end fitting adapter (85) to retain, at the trailing side (68) of the transfer arm (60), a first end fitting (5a). And the transfer arm (60) is provided with a second retainer (90) to retain, at the leading side (67) of the transfer arm (60), a second end fitting (5b).

The present invention relates to a marine pipelaying system (1) and method for lowering and/ or raising an offshore pipeline and including one or more accessories (30) thereto, the system (1) comprising a pipeline launch device (10), a pipeline clamp (6a, 6b), an accessory connecting device and a controlled load hoisting device (19). An accessory handling device (20) is provided comprising an accessory transport track (21) and a cart (23) adapted to engage and support one of the one or more accessories, such that the accessory handling device (20) is adapted to engage said accessory at the engagement position, position said accessory in the pipeline connecting position in the firing line (11) above the pipeline clamp 6a, 6b), wherein the accessory can be connected to the pipeline and support and allow displacement of the accessory between the engagement position and the pipeline connection position.

During recovery of an offshore pipeline, to a floating vessel for repair, for example, the pipeline is secured to a hang-off clamp. Due to the motion of the vessel, oscillating bending moments can be caused in the pipeline below the clamp. To reduce these bending moments an auxiliary member is employed which restricts “radial” movement of the pipeline below the clamp. The auxiliary member comprises an elongate element, such as a pipe, whose upper end is fixed to the vessel and whose lower end carries a member connecting it to the pipeline. Axial movement of the pipeline with respect to the connecting member is permitted. The auxiliary member is designed to have predetermined amount of flexibility, this being provided in particular by flexibility of the pipe, and it thus restricts the amount of radial movement of the pipeline which is permitted below the clamp.

A plug for use during a pipeline laying operation for sealing off sections of the pipeline in case of water ingress. A sealing and gripping assembly is formed of slip segments around a partially conical shaped surface, the slip segments being moved by a piston/cylinder arrangement. A valve connected to a pressure vessel actuates the piston/cylinder in response to the detection of conductivity of fluid around the plug.

The invention discloses a novel sea area pipeline laying floating assisting method, and relates to an offshore pipeline laying engineering technology. A pipeline laying ship is accurately positioned to ensure that a pipeline can be laid along a preset pipeline laying axis, seawater is poured into the pipeline, the dead weight of the pipeline is increased, the pipeline automatically slides down to the sea from a stinger, a certain friction force is provided for the pipeline through a clamping device, buckling and wrinkling caused by too high gliding speed of the pipeline are avoided, floating-assisting bodies composed of foam floating bodies are evenly installed on the pipeline, buoyancy is provided when the pipeline sinks, the deformation curve of the pipeline under water is restrained, stress borne by the pipeline is reduced, the protection effect is achieved, a common pipeline laying project does not adopt floating-assisting facilities, and according to the method, economical and efficient floating-assisting facilities are added on the basis of a traditional laying method, so that the stability during pipeline laying is enhanced.

The invention belongs to the technical field of researches such as rock-soil, geology and environment, and provides a horizontal continuous measuring method for soil mass parameters of a soft soil site. The horizontal continuous measuring method for the soil mass parameters of the soft soil site comprises the following main measuring steps of arranging soil mass strength measuring devices at the front end of a towing device, arranging soil mass strain softening relationship measuring devices at the bottom end of the towing device, and measuring interface friction parameters between a soil massand a structure, wherein the towing device actively or passively walks in a soft soil layer, a part of the towing device in walking is ensured to penetrate into a soil layer to be measured, and the penetration depth of the towing device is controlled through adjusting balance weight above the towing device and a towing angle of the towing device. The method provided by the invention breaks through the limitation that the horizontal continuous soil mass parameters cannot be acquired through a traditional single-point vertical measuring method, and can accomplish the horizontal long-distance continuous field measurement of the parameters such as the soil mass strength, the strain softening, and the interface friction effect between the soil mass and the structure through a one-time towing test; and the measured parameters can be used for guiding design and construction of projects such as breakwater projects, oil and gas offshore pipelines, cables and optical cables.

The invention discloses an energy-saving and environment-friendly floating body connection device for offshore pipelines. The device comprises a float, four sliders and a floating body. A manual telescopic rod is fixed on the outer wall of the top of the float body through bolts, At that top end of the manual telescopic rod, a hinge is fix by bolts, At that same time, the hinge is articulate witha solar cell panel, the outer wall of one side of the float body is provided with an annular groove, the inner walls of both side of the annular groove are fixed with slide rails by bolts, the outer walls of the top and the outer walls of the bottom of the four sliding blocks are respectively welded with wind fan blades and rotary fan blades, and the wind fan blades and the rotary fan blades are arc-surface streamlined structures. As that incline groove of the L-shaped mechanism and the arc-shaped fan cooperate with each other, the frictional force between the rotary fan blade and the currentis increased, and the loss of wave energy is reduced. The invention makes the floating body free from the phenomenon of water inflow when the floating body is impacted by the huge sea waves, and doesnot cause the air pressure in the connecting box to change, thus causing the floating body connection to be broken.

A marine J-lay pipelaying system for use on a vessel for laying an offshore pipeline has a J-lay tower, a pipe connecting station, wherein said pipe section is connected to the previously launched pipeline, and J-lay tower bearing means which allow for the pivoting of the J-lay tower with respect to the vessel.

The J-lay tower has a free-pivotal mode wherein the J-lay tower is freely pivotable with respect to the vessel so that the J-lay tower has an orientation independent from sea-state induced vessel motions.

A pipe section loader is moveable between a loading position, wherein a new pipe section is received, and a erected position, wherein the new pipe section is aligned with the J-lay tower;

The pipe section loader is provided with an automatic synchronizing system which—when the pipe section loader is moved from its loading position to its erected position—causes a synchronised pivotal motion of the pipe section loader with respect to the J-lay tower in its free-pivotal mode—at the latest as the pipe section loader reaches its erected position—, so that the new pipe section is aligned with the J-lay tower is in its free-pivotal mode.

The embodiment of the invention discloses a friction electrostatic power generation device based on the vibration of an offshore riser, the device comprises a flexible insulating film coated and fixedon the surface of an offshore riser, a plurality of friction electrostatic generating units are encapsulated in the flexible insulating film, the flexible insulating film and the friction electrostatic generating units inside the flexible insulating film are co-deformed with the offshore riser, and the mechanical energy of the vibration deformation of the offshore riser under the excitation of the ocean current is converted into electric energy. The electric energy generated by the power generation device of the invention can completely provide enough electric energy for the monitoring systemof the offshore pipeline and the monitoring data transmission system, and can also be provided with an electric energy storage device, which can be stored in time when the electric energy is generated surplus, so as to ensure the continuous power supply of the system. The invention directly supports the wireless monitoring of the pipeline in the special environment such as the sea and the wireless transmission of the monitoring data from the technology, which is an important innovation of the underwater structure detection technology.

The invention discloses an L-shaped shallow sea pipeline laying process, and relates to the technical field of pipeline laying engineering. The L-shaped shallow sea pipeline laying process comprises the following steps of towing a pipeline laying ship to a pipeline laying axis position, carrying out anchoring by an anchoring ship, and adjusting the pipeline laying ship to the designed pipeline laying axis center position; hoisting two sections of steel pipes to a guide frame for pipeline laying, enabling the pipe sections to slide downwards to a pipeline welding platform along a track of the guide frame, and welding the two sections of steel pipes into a pipeline; enabling the pipeline to slide downwards to a stinger, and fixing the pipeline through a clamping device; hoisting a next pipe section to the guide frame, and completing welding of the pipe section and the pipeline on the welding platform; loosening the pipe clamping device, and enabling the first two sections of pipelines to enter water by adopting a water injection method; enabling the pipeline laying ship to move backwards and retreat, and enabling the pipeline to slide down to the seabed along the stinger; and repeating the procedures of fixing, hoisting, welding and lowering until all pipelines are laid. According to the L-shaped shallow sea pipeline laying process, the construction efficiency of offshore pipeline laying can be improved, the influence of environmental factors on pipeline laying construction operation is reduced, the effect is good, and the positioning precision is higher.

The invention belongs to the technical field of auxiliary hoisting devices for construction, in particular to an auxiliary hoisting device for offshore pipeline construction. The auxiliary hoisting device for offshore pipeline construction comprises a hoisting column, wherein a column base is arranged at the bottom end of the hoisting column, a fixed lazy arm is arranged at the top end of the hoisting column, an adjustable lazy arm is arranged on the side wall of the hoisting column, a lazy arm fixing bolt is arranged in the adjustable lazy arm, a direction adjusting ring plate is arranged onthe outer surface wall of the hoisting column, and a rope positioning block is arranged at the top end of the fixed lazy arm. By matching the hoisting column, the column base, the fixed lazy arm, theadjustable lazy arm, the lazy arm fixing bolt, the direction adjusting ring plate, the rope positioning block and a fixed bolt hole, the device body is simple in structure, reasonable in design, convenient to operate and solid and durable, can be used circularly and not only improves the construction level of offshore trestle pipeline construction greatly, but also can solve the problem that it ishard to mount the offshore pipeline when there is no hoisting operation ship to support construction effectively.

The invention belongs to the field of offshore oil engineering, and particularly relates to a control system and a control method for synchronous positioning of a subsea pipeline transverse moving trolley, the control system for synchronous positioning of the subsea pipeline transverse moving trolley comprises an electrical control module, a hydraulic control module and a driving unit; the drivingunit comprises at least two hydraulic motors mounted on the transverse moving trolley; the hydraulic control module comprises an electric proportional reversing valve, an electromagnetic valve, a hydraulic flow divider, a matched hydraulic pipeline and a matched hydraulic accessory. And the electrical control module comprises a control unit, a master switch and a sensor group. According to the control system and the control method for synchronous positioning of the submarine pipeline transverse moving trolley, accumulated errors and manual deviation rectification adjustment caused by the accumulated errors are avoided, so that the reliability and the working efficiency of the whole transverse moving equipment are improved, and the operation difficulty of the equipment and the offshore pipeline laying operation cost are reduced.

The invention provides a dissimilar metal X80 pipeline steel and 2507 super duplex stainless steel CMT welding method applied to an offshore pipeline engineering platform. The method comprises the following preparation steps that S1, sections of to-be-welded parts of X80 pipeline steel and 2507 super duplex stainless steel are machined into Y-shaped grooves; S2, surfaces and the grooves of steel plates are polished to remove impurities such as oxide; S3, the steel plates ire fixed to a clamp with a heat dissipation channel, a distance between the plates is 2 mm, the two ends of the plates are fixed through spot welding, an ER2594 duplex stainless steel welding wire is adopted as a filling material, a diameter phi of the welding wire is 1.2, a current is 140 A to 150 A, a voltage is 10 V to 12 V, time is 1 s, mixed shielding gas with 2% of CO2 and 98% of Ar is introduced, and a gas flow is 12 L/min; S4, an MIG welding machine of a cold metal transition welding technology (CMT) is adopted for welding the plates, a welding speed is 45 mm/min, a current is 145 A, a voltage is about 12 V, and a protective gas flow is 12 L/min; S5, a welding table is cooled after welding is completed, and the next batch of samples are welded when the welding table is cooled to 160 DEG C or below; and S6, nondestructive flaw detection and weld joint two-phase proportion detection are conducted on a welded joint, and a welding process is completed after detection is qualified.

The invention provides a high strain hot rolled steel plate for an L485M offshore pipeline pipe and a manufacturing method thereof. The steel plate is prepared from the following components in percentage by weight: 0.02 to 0.08 percent of C, 0.10 to 0.40 percent of Si, 1.40 to 1.80 percent of Mn, 0.02 to 0.08 percent of Nb, 0.01 to 0.05 percent of V, 0.01 to 0.04 percent of Ti, 0.025 to 0.045 percent of Al, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 0.10 to 0.50 percent of Cu, 0.02 to 0.30 percent of Mo, 0.06 to 0.45 percent of Cr, 0.10 to 0.50 percentof Ni, and the balance of Fe and unavoidable impurity elements. The manufacturing method comprises the steps of smelting molten steel, refining out of a furnace, casting, re-heating a plate blank, performing controlled rolling, performing controlled cooling, and performing air cooling to room temperature; the longitudinal mechanical properties of the steel plate produced by applying the manufacturing method are that the UEL (Uniform Elongation of Deformation) is greater than or equal to 10 percent, the yield strength Rt 0.5 is 400 to 550 MPa, the tensile strength Rm is 550 to 700 MPa, and theyield-to-strength ratio Rt0.5/Rm of the steel plate is 0.70 to 0.80.

The invention discloses a ship special for pipeline laying in a shoal area, and relates to the technical field of offshore pipeline laying engineering. The ship comprises a ship body, wherein a pipeline laying tool is fixedly arranged on the ship body; the pipeline laying tool comprises a guide support, the guide support is provided with a guide sliding groove formed in the keel direction of the ship body, and the guide sliding groove is obliquely formed downwards from the rear end to the front end and extends downwards to the tail end of the ship body; a pipe supporting bracket extending outof the ship body is arranged in front of the guide bracket, and one end of the pipe supporting bracket is hinged with the ship body and butted with the guide sliding groove; a lowering mechanism usedfor lowering the pipe supporting bracket to enable the pipe supporting bracket to correspond to the inclination angle of the guide sliding groove is arranged on the ship body; a pipeline enclasping device is fixedly mounted between the guide bracket and the pipe supporting bracket, and the clamping center line of the pipeline enclasping device is parallel to the guide sliding groove; and a weldingstation is arranged on the guide bracket. According to the ship, construction technology is more efficient, the construction quality is better, stable and continuous pipeline laying operation can beachieved under the complex sea condition of the shallow water area, and the construction efficiency is improved.