12 results about "Offshore pipelines" patented technology

The invention relates to the technical field of offshore pipeline body construction, and discloses a structure for preventing pipeline rotation during pipeline laying and a construction method.The structure comprises a pipeline launching frame used for launching a pipeline body and a rail piece arranged above the pipeline launching frame, and a plurality of fixed portal frames are arranged at the top of the pipeline launching frame; the inner wall of the fixed portal frame is connected with the top of the rail piece, a plurality of slidable pulley blocks are installed on the rail piece, anchor chains are connected to the bottoms of the pulley blocks, the bottom ends of the anchor chains are connected to the top of the pipeline body, and a plurality of buoys are installed on the surface of the pipeline body. According to the structure for preventing the pipeline from rotating in the pipeline laying process and the construction method, when the pipeline body slides down along the rail piece, rotation of the pipeline body is restrained through constraint of the anchor chain and the pulley block; the buoyancy balance provided by the buoy and the symmetrical sacrificial anode protection blocks on the two sides are used for balancing the gravitational torque after the pipeline body enters the sea, and rotation of the pipeline body is restrained.

The utility model discloses a marine pipe cable anti-bending device and internal metal insert, including the hooping flange plate and the bottom plate that are arranged in parallel, the hooping flange plate is uniformly provided with first positioning mounting holes, the bottom plate is uniformly provided with second positioning mounting holes, the first positioning mounting holes and the second positioning mounting holes are in one-to-one correspondence, and the first positioning mounting holes and the second positioning mounting holes are in one-to-one correspondence. A connecting rod is arranged between the first positioning mounting hole and the second positioning mounting hole, positioning step grooves are formed in the first positioning mounting hole and the second positioning mounting hole corresponding to the connecting rod, the end of the connecting rod extends into the positioning step grooves, a screw section is further arranged at the end of the connecting rod, and the screw section is connected with the connecting rod. The screw rod section penetrates through the second positioning mounting hole, the connecting rod and the first positioning mounting hole are fixed through a bolt, and a reinforcing cylinder is arranged in the middle of the bottom plate. The utility model has the advantages of higher production quality, convenience in assembly and stability and reliability in use.

The invention relates to the field of offshore pipeline laying, and particularly discloses a method for laying an offshore pipeline crossing an existing high-speed bridge, which mainly comprises the following steps: construction method pile and platform construction, trench excavation construction, foundation treatment, main pipeline assembly welding, splicing and sinking, gravelly soil backfilling, low-strength self-compaction flow state filling material construction, and pile and platform dismantling construction. According to the construction method, the outer side of the pile foundation penetrating through the lower portion of the expressway is subjected to pile enclosure excavation through the PLC construction method, the pile foundation can be protected, disturbance of the excavated groove soil body is reduced, and then safe use of the pier and the temporary trestle bridge is guaranteed.

This application belongs to the field of subsea pipeline welding, and specifically discloses a back bead welding process curve, application and product based on a narrow-gap U-groove. This back bead welding process curve is used to weld the narrow-gap U-groove, and on the basis of the CMT reference curve, at least one current pulse is introduced respectively before and after the short-circuit stage to increase the root bead width and avoid root depression. At the same time, the peak current and cycle time are increased to increase the welding heat input, and the peak current rising rate and peak current falling rate are reduced to extend the action time of the peak current. This application can increase the welding heat input and root bead width, achieve excellent single-sided welding with double-sided forming effect under the conditions of 0-gap butt joint and no backing, solve the problem of weld defects, and effectively improve the service performance of acidic offshore pipelines.

The invention discloses a construction method for offshore pipeline butt joint. The construction method comprises the following steps that whether a drill bit of a directional drill drills to an unearthed point or not is determined; when the drill bit drills to an unearthed point, preliminarily detecting an unearthed area of the drill bit by using magnetic detection equipment; a channel reserved by a drill rod of the directional drill is inflated by an air compressor at the starting point of the directional drill; when bubbles emerge from the head of the drill bit, a diver dives to find the accurate position of the drill bit and marks the drill bit; the drill bit continuously drills forwards until the drill bit is exposed out of the sea level; dragging a pipe dragging head of the bottom dragging laying pipe to an area near a drill bit from the other side far away from the directional drill, and hoisting by a crane on a barge connecting platform; the butt joint of the bottom dragging laying pipe and the drill bit is completed on the barge connecting platform, and then the connected bottom dragging laying pipe and the drill bit are placed at designated positions. According to the construction method for offshore pipeline butt joint, the butt joint operation can be rapidly completed.

The utility model discloses a near-shore pipeline detection device which comprises a detection head used for installation and a fixed connection block fixedly installed at the upper end of the detection head. The device further comprises a connecting rod, the connecting rod is arranged in the upper end of the fixed connecting block, a torsion buckle is installed on the front side of the connecting rod, a protective shell is arranged in the middle of the fixed connecting block, a threaded connecting block is installed at the upper end of the protective shell, sliding grooves are formed in the left side and the right side of the inner wall of the protective shell, and threaded rods are connected into the sliding grooves. A fixing rod is mounted at the upper end of the threaded rod, a grip is fixedly mounted at the upper end of the fixing rod, a supporting frame is arranged on the outer side of the protective shell, a bolt is mounted and connected to the left end of the supporting frame, and a button is arranged at the upper end of the right side of the supporting frame. According to the offshore pipeline detection device, the angle of the pipeline detection device can be adjusted conveniently, the offshore pipeline detection device can be adjusted conveniently, and the illumination range can be adjusted conveniently according to the environment.

The utility model discloses an auxiliary mechanism for offshore casing pipe installation, which comprises a pipe sleeve, a sealing gasket is protruded on the part of the inner wall of the pipe sleeve, which is abutted against a pipeline, the sealing gasket is provided with a flow guide groove which is aligned with the joint of the pipeline, and the flow guide groove is matched with a monitoring mechanism to monitor the leakage of a medium in the pipeline at the joint of the pipeline. According to the utility model, the sealing gasket is arranged on the inner wall of the pipe sleeve, and the diversion trench is arranged on the sealing gasket, so that the medium in the leaked pipeline at the pipeline joint is accurately collected and guided, once the pipeline leaks, the medium in the pipeline flows into the diversion trench under the guide of the sealing gasket and is in contact with the monitoring rod of the monitoring mechanism, and the sensor can quickly detect the leakage; by means of the design, the monitoring sensitivity of medium leakage in the pipeline is improved, potential safety hazards can be found in the first time, environmental pollution and resource waste caused by medium leakage in the pipeline are avoided, and the safety and stability of offshore pipeline transportation are effectively guaranteed.

The invention discloses a method for laying an offshore pipeline penetrating through an existing dike. The method comprises the steps that S1, construction preparation is conducted; s2, engineering measurement is carried out; step S3, constructing a cofferdam; s4, engineering construction of the embankment penetrating pipe body is carried out; s5, embankment body filling is carried out; s6, soil is cemented, and earthwork is closed; s7, upstream face slope protection construction is conducted; s8, constructing an inner slope and a wave wall; step S9, construction of the embankment top pavement; s10, land pipe construction is carried out; and S11, cofferdam dismantling construction is conducted. The stability and safety of the dike structure are ensured, the investment cost is reduced, and the construction period is shortened.

The utility model relates to the technical field of sea pipe repair splicing auxiliary device, disclose a kind of sea pipe repair splicing auxiliary device with anticorrosive coating, including repair mesa, the repair mesa bottom is fixedly connected with multiple support columns, every two the support column between fixedly connected with connecting column, connecting column outer wall rotationally connected with swing frame, the repair mesa inside is provided with adjusting assembly, the adjusting assembly includes handlebar, the handlebar rotationally connected in the repair mesa interior, handlebar side wall is fixedly connected with bidirectional screw rod, the bidirectional screw rod outer wall is connected with multiple sliding blocks, each the sliding block lower surface is fixedly connected with hanging platform. In the utility model, by handlebar, bidirectional screw rod and swing frame transmission, realize the flexible adjustment of repair mesa height, solve the problem of the fixed height of traditional auxiliary device, adapt to the height requirement of different sea pipe repair, ensure that pipeline butt joint is accurate when repairing, reduce the situation of not tight or not stable joint.

The invention discloses a near-shore section oil-gas chemical pipeline directional drilling crossing construction back-dragging method, belongs to the technical field of offshore oil-gas chemical pipeline construction, and solves the problems that dragging operation is obviously influenced by weather and low in construction efficiency due to the fact that directional drilling barge sets are arranged on the sea, dragging failure is easily caused due to poor barge stability, and the construction efficiency is low. Serious risks are caused to offshore pipeline launching or landing. The method comprises the following steps: welding a whole pipeline on land, treating welding joints, mounting dragging joints at two ends of the pipeline and the like; dragging the pipeline into the sea along a launching point by using a tugboat; injecting water into the pipeline to adjust the buoyancy and the floating and sinking state of the pipeline; dragging to a preset coordinate point of a directional drilling seabed, and connecting the back-dragging joint with a directional drilling guide rod; a directional drilling device arranged on the land is used for dragging the pipeline back to land at a time. According to the method, efficient, stable and economical pipeline back-dragging construction is achieved through cooperation of land whole pipe prefabrication, rail drag reduction, off-bottom dragging and real-time monitoring.

The invention discloses an experimental device for complex working conditions of an ocean platform and a submarine pipeline, which relates to the technical field of ocean oil and gas gathering and transportation flow guarantee and comprises an oil-gas-water supply system, an ocean platform simulation system, an ocean pipeline system, an ocean environment simulation system and an oil-gas-water separation system. The oil-gas-water supply system is used for simulating and conveying oil-gas-water fluids with different properties according to different experiment requirements, the ocean platform simulation system is used for mixing oil-gas-water provided by the oil-gas-water supply system and conveying the oil-gas-water to the ocean pipeline system, and the ocean pipeline system is used for conveying the oil-gas-water mixed fluid and monitoring pipeline data. The marine environment simulation system can simulate different sea areas and different marine working environments close to reality and simulate severe marine environments such as typhoons and earthquakes, experimental scenes of submarine pipelines are increased, and a safe transportation rule of crude oil of the submarine pipelines among multiple platforms can be conveniently obtained from experiments.

A construction method for offshore pipeline butt joint, comprising the following steps: determining whether the drill bit of the directional drill has drilled to the emergence point; after the drill bit drills to the emergence point, preliminarily detecting the emergence area of the drill bit by using a magnetic force detection device; inflating the channel reserved for the drill rod of the directional drill by an air compressor at the starting point of the directional drill; when the bubbles come out from the head of the drill bit, a diver dives to find the accurate position of the drill bit and marks it; the drill bit continues to drill forward until the drill bit emerges from the sea level; the pipe pulling head of the bottom pipe laying is pulled from the side far away from the directional drill to the area near the drill bit, and then is lifted by the crane on the barge connection platform; the butt joint of the bottom pipe laying and the drill bit is completed on the barge connection platform, and then the bottom pipe laying and the drill bit after butt joint are lowered to the designated position. The construction method for offshore pipeline butt joint can quickly complete the butt joint operation.