CN102269328B - Offshore oil and gas transportation flexible vertical pipeline - Google Patents

Abstract

The invention discloses a flexible riser pipeline for offshore oil and gas transportation, which includes a cable, a hose for oil and gas transportation, an anchor chain and a buoyancy component for determining the space path of the pipeline, and the cable and the anchor chain The cables are connected by a connecting component, and the cable is equipped with a constraint component to cover the hose to prevent the hose from drifting. The anchor chain supported by the buoyancy component forms a vertical gravity catenary line segment and a horizontal wave line segment to determine the riser pipeline. space path. The invention adopts a flexible standpipe to realize oil and gas transportation, cables and gravity anchor chains can effectively restrain the hose, realize reliable oil and gas transportation, prevent the hose from drifting in large displacements in seawater, and have hose protection Good, solid and reliable, low cost, safe and reliable, convenient and easy construction, fast construction speed.

Description

A flexible riser pipeline for offshore oil and gas transportation

technical field

The invention relates to the field of offshore operation systems such as offshore oil production and gas production, and in particular to a flexible riser pipeline for offshore oil and gas transportation.

Background technique

With the depletion of oil and gas reserves in coastal areas and shallow water areas, the exploitation and production of oil and gas resources in deep water areas has become the goal of marine energy development. Most of the large offshore oil fields discovered so far are located in deep waters, and the exploitation and production of offshore oil and gas resources in countries all over the world are accelerating their development to deeper waters. The oil pipeline is one of the key structures in the deep sea oil production system. As the depth of the subsea oil field deepens, the design, construction and operation management of the traditional steel pipe oil pipeline become more and more difficult and the cost is also higher and higher.

Contents of the invention

The technical problem to be solved by the present invention is to provide a flexible riser pipeline for offshore oil and gas transportation that is safe, reliable, convenient and easy to construct, fast in construction speed and low in cost.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A flexible riser pipeline for offshore oil and gas transportation, which includes a cable, a hose above the cable for oil and gas transportation, and an anchor chain below the cable for determining the space path of the pipeline; the cable and the The flexible pipes are connected by restraint components; the cables are connected with the anchor chains by connecting components; the anchor chains are connected with buoyancy components. The restraint assembly covers the hose to prevent the hose from drifting; the connection assembly fixes the cable on the anchor chain to ensure that the anchor chain, cable, and pipeline have the same spatial path; the buoyancy assembly supports the anchor chain to form a vertical The gravitational catenary line segment in the direction and the wave line segment in the transverse direction.

As a further improvement of the technical solution of the present invention:

The connection assembly includes a connection belt and first clamps arranged at both ends of the connection belt. The end of the first clamp is provided with a positioning groove, the cable is clamped and fixed in the positioning groove, and the anchor chain is sleeved on the head-to-tail connection. in the connecting band on the cable.

The restraint assembly includes a restraint belt and a second clamp arranged at both ends of the restraint belt, the end of the second clamp is provided with a positioning groove, the cable is clamped and fixed in the positioning groove, and the hose is sleeved on the head-to-tail connection in the restraint band on the cable.

The buoyancy assembly includes a buoyancy box and/or a buoy, and the buoyancy box and the buoy can be used at the same time, or one of them can be used.

The buoyant tank is fixed on the seabed foundation through the buoyant tank tension cable, and the buoyant tank is connected with the anchor chain through bolts.

The buoy is connected with the anchor chain through the buoy connecting belt.

The end of the hose is provided with a hose joint, and the hose joint includes a connecting pipe and a reinforcing hoop with bolts, the hose is adhesively sleeved on the connecting pipe, and the reinforcing hoop is sleeved on the On the junction of the hose and the connecting pipe, the outlet end of the connecting pipe is provided with a connecting portion for installation and connection.

The present invention has the following advantages:

1. The present invention uses hoses as standpipes for offshore oil and gas transportation. Gravity anchor chains, buoys and buoys determine the spatial path of pipelines. Cables and restraint components prevent hoses from drifting in large displacements and are effectively restrained. Hoses reliably transport oil and gas. The riser for oil and gas transportation has the advantages of good hose protection, firmness and reliability, and low cost.

2. The invention uses a hose riser to realize oil and gas transportation. The hose is light in weight, does not need anti-rust treatment, can be folded, and can be coiled on the drum, and will not cause pipeline damage due to seawater pressure during construction. Buckling damage, less joints, fast laying construction speed; when the hose is used to transport oil and gas, the pressure generated by the oil and gas in the hose can be balanced by the seawater pressure outside the hose, the stress acting on the hose wall is small, and it is more economical Material: when the hose is used to transport oil and gas, the proportion of oil and gas in the pipe is smaller than that of seawater, and the oil and gas in the hose can be affected by the buoyancy of seawater. delivery pressure.

3. The riser of the present invention can reduce the laying length of oil and gas pipelines on the seabed, avoiding the laying of pipelines on the seabed with complex topography.

4. The riser of the present invention has a transverse wave-relaxing line segment, which can reduce the stress on the pipeline at the connection between the oil production barge and the hose, and can relax the horizontal and vertical displacement limits of the oil production barge under the wave load.

Description of drawings

Fig. 1 is a schematic diagram of a riser pipeline structure according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional structure diagram of a vertical section of a riser pipeline according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional structure diagram of a transverse section of a riser pipeline according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a connection assembly in an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a constraining component in an embodiment of the present invention.

Fig. 6 is a structural schematic diagram of the relationship between the buoyancy tank and the anchor chain in the embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a hose joint in an embodiment of the present invention.

Fig. 8 is a schematic structural view of the laying application of the embodiment of the present invention.

Legend: 1. Cable; 2. Hose; 21. Hose connector; 211. Connecting pipe; 212. Connecting part; 213. Reinforcing hoop; 3. Anchor chain; , the second fixture; 421, the positioning groove; 5, the cable water entry control pulley; 6, the hose control winch; 7, the cable control winch; 8, the connection assembly; 81, the connection belt; 82, the first fixture; 821, Positioning groove; 9, buoyancy component; 91, buoy; 910, buoy connection belt; 911, buoy connection belt fixed end; 92, buoyancy box; 921, buoyancy box tension cable; 1. Offshore platform or oil production vessel; 11. Subsea foundation.

Detailed ways

As shown in Fig. 1, Fig. 2 and Fig. 3, the flexible riser pipeline for offshore oil and gas transportation in the embodiment of the present invention mainly includes a cable 1, a hose 2 for oil and gas transportation and a pipe for determining the spatial path of the pipeline. Anchor chain 3; the buoyancy assembly 9 is provided on the anchor chain 3, and the buoyancy assembly includes a buoy 91 and a buoyancy box 92, and the buoyancy box 92 is fixed on the seabed foundation 11 by a buoyancy box tension cable 921, supported by the buoyancy box 92 and the buoyancy box 91 The live anchor chain 3 forms the spatial path of the riser pipeline, the cable 1 and the anchor chain 3 are connected by a connecting component 8, and the cable 1 is provided with a restraint component 4 to cover the hose 2 to prevent the hose 2 from 2 drift occurs.

As shown in Figure 4, the connection assembly 8 includes a connection belt 81 and a first clamp 82 arranged at both ends of the connection belt 81, the end of the first clamp 82 is provided with a positioning groove 821, and the cable 1 is clamped and fixed in the positioning groove 821 , the anchor chain 3 is sheathed in the connection belt 81 connected end to end on the cable 1 . The connection assembly 8 is simple in structure and low in cost, and can reliably connect the anchor chain 3 and the cable 1 . Before being clamped and fixed with the cable 1, the connecting assembly 8 is a belt with first clamps 82 at both ends. When in use, a first clamp 82 is clamped and fixed on the cable 1, and then the connecting belt 81 Enclosing the anchor chain 3 , and finally clamping and fixing another first clamp 82 on the cable 1 can realize the installation of the connection assembly 4 .

As shown in Figure 5, the restraint assembly 4 includes a restraint band 41 and a second clamp 42 arranged at both ends of the restraint band 41, the end of the second clamp 42 is provided with a positioning groove 421, and the cable 1 is clamped and fixed in the positioning groove 421 , the hose 2 is sheathed in the restraint band 41 connected end to end on the cable 1 . The constraint assembly 4 is simple in structure and low in cost, and can achieve reliable fixing of the hose 2 without damaging the hose 2 . Before being clamped and fixed with the cable 1, the restraint assembly 4 is a belt with two ends provided with second clamps 42. When in use, a second clamp 42 is clamped and fixed on the cable 1, and then the restraint belt 41 Covering the hose 2, and finally clamping and fixing another second clamp 42 on the cable 1 can realize the installation of the constraint assembly 4.

As shown in FIG. 6 , the anchor chain 3 is fixed on the buoyancy tank 92 with bolts 922 .

As shown in FIG. 3 , the buoy connecting belt 910 encloses the anchor chain 3 , the cable 1 and the flexible pipeline 2 which are connected and constrained together, and is fixed on the buoy 91 through the fixed end 911 of the buoy connecting belt.

As shown in Figure 7, the end of the hose 2 is provided with a hose joint 21, the hose joint 21 includes a connecting pipe 211 and a reinforcing hoop 213 with bolts, the hose 2 is adhesively sleeved on the connecting pipe 211, and the reinforcing hoop 213 is sheathed on the junction of the hose 2 and the connecting pipe 211, and the outlet end of the connecting pipe 211 is provided with a connecting portion 212 for installation and connection. On the one hand, the structure of the hose joint 21 can be used to connect the hose 2 with other connectors, such as the connection with underwater and above-water oil production equipment, and on the other hand, it can also be used for the extension of the hose 2, and the connection structure is firm and reliable. , can effectively bear the tension exerted on the pipeline during construction. In this embodiment, the hose 2 is bonded and sheathed on the connecting pipe 211 to form a sealed connection, and the seal is safe and reliable. The connecting part 212 is provided with bolt holes, which can be connected with flanges of other equipment.

In this embodiment, the cable 1 is a steel cable, and cables made of other materials can also be used, and the number of cables can also be two or more. The hose 2 is formed by winding high-strength fiber filaments and primer materials. The high-strength fiber filaments can be made of carbon fibers, glass fibers, aramid fibers or other high-strength fiber filaments; in addition, they can also be made of ordinary plastic or rubber materials. In addition to the shape disclosed in this embodiment, the constraining assembly 4 can also adopt other structures, as long as it can constrain the hose 2, the constraining band 41 can be steel plate, steel bar, steel cable, steel wire or fiber products. In addition to the shape disclosed in this embodiment, the connection assembly 8 can also adopt other structures, as long as the cable 1 and the anchor chain 3 can be connected, the connection belt 81 can use steel plates, steel bars, steel cables, steel wires or fiber products, etc. . All steel materials in contact with seawater in this embodiment can be treated with anti-rust coating or cathodic protection anti-rust treatment.

As shown in Figure 8, when a laying vessel is used to lay the riser pipeline at sea, the cable 1 is wound on the cable control winch 7, the hose 2 is wound on the hose control winch 6, and a cable is installed on the stern side to enter the water. The control pulley 5 and the anchor chain 3 are stacked on the laying ship or other auxiliary ships. The detailed operation steps are as follows:

1) Install the hose connector 21. Pull out the hose 2 on the hose control winch 6 to a sufficient length, glue the hose 2 on the connecting pipe 211 of the hose joint 21, and set the reinforcing hoop 213 on the hose 2 and the connecting pipe 211 At the junction of the connecting pipe 211 and the hose 2, the connecting pipe 211 and the hose 2 are tightly socketed to a degree of complete sealing by tightening the bolts on the reinforcing hoop 213.

2) Pull out the cable 1 on the cable control winch 7 to a sufficient length, let the cable 1 pass through the cable into the water control pulley 5, and then weld the end of the cable 1 to the hose joint 21 of the hose 2 superior.

3) As the laying ship moves forward, the cable 1, hose 2 and anchor chain 3 are gradually and synchronously put into the sea by the cable control winch 7, the hose control winch 6 and the cable entry control pulley 5. The restraint assembly 4 and the connection assembly 8 are installed at the stern of the laying ship, and only when the restraint assembly 4 and the connection assembly 8 need to be fixed on the cable 1, the laying ship temporarily stops moving forward and stops laying the cable. A constraint component 4 is placed every 1 meter, and a connection component 8 is placed every 2 meters.

When installing the constraint assembly 4 , a second clamp 42 is clamped and fixed on the cable 1 , then the constraint band 41 is wrapped around the hose 2 , and finally another second clamp 42 is clamped and fixed on the cable 1 .

When installing the connection assembly 8 , clamp and fix a first clamp 82 on the cable 1 , then wrap the connecting belt 81 around the anchor chain 3 , and finally clamp and fix the other first clamp 82 on the cable 1 .

When the pipeline is laid through the top of the buoyant tank 92, the anchor chain 3 is fixed on the buoyant tank 92.

When the pipeline is laid to the offshore platform or the oil production ship 10 according to the design, the cable 1 , the flexible hose 2 with the joint 21 and the anchor chain 3 are respectively connected to relevant components of the offshore platform or the oil production ship 10 .

Let the buoy connection belt 910 pass through the anchor chain 3 to cover the hose 2 and the cable 1, and fix the buoy connection belt 910 on the buoy 91 through the fixed end 911 of the buoy connection belt, so that the horizontal section of the riser pipeline forms gentle waves shape.

The above descriptions are only preferred implementations of the present invention, and the scope of protection of the present invention is not limited to the above-mentioned implementations. All technical solutions belonging to the principle of the present invention belong to the scope of protection of the present invention. For those skilled in the art, some improvements and modifications made without departing from the principles of the present invention should also be regarded as the protection scope of the present invention.

Claims (2)

1. offshore oil delivery gas transmission compliant riser pipeline is characterized in that: it comprises that cable (1), cable (1) top are used for the anchor chain (3) that the flexible pipe (2) of On The Oil And Gas Transportation, cable (1) below are used for determining the pipeline space path; Adopt restraint assembly (4) to link to each other between described cable (1) and the described flexible pipe (2); Adopt connection part (8) to link to each other between described cable (1) and the described anchor chain (3); Described anchor chain (3) links to each other with buoyance module (9);

Described connection part (8) comprises connecting band (81) and is located at first anchor clamps (82) at connecting band (81) two ends, the end of described the first anchor clamps (82) is provided with locating slot (821), described cable (1) is clamped and fastened in the locating slot (821), and described anchor chain (3) is sheathed in the connecting band (81) that is connected in from beginning to end on the cable (1);

Described restraint assembly (4) comprises restraint strap (41) and is located at second anchor clamps (42) at restraint strap (41) two ends, the end of described the second anchor clamps (42) is provided with locating slot (421), described cable (1) is clamped and fastened in the locating slot (421), and described flexible pipe (2) is sheathed in the restraint strap (41) that is connected in from beginning to end on the cable (1);

Described buoyance module (9) comprises floating drum (91) and buoyancy tank (92); Described buoyancy tank (92) is fixed in the seafloor foundation (11) by buoyancy tank tension cord (921); Described anchor chain (3) adopts bolt (922) to be fixed on the described buoyancy tank (92);

Adopt floating drum connecting band (910) to link to each other between described anchor chain (3) and the described floating drum (91), the two ends of described floating drum connecting band (910) have floating drum connecting band fixed end (911); Described floating drum connecting band (910) passes described anchor chain (3), and described cable (1) and flexible pipe (2) are entangled, and recycles described floating drum connecting band fixed end (911) described floating drum connecting band (910) is fixed on the described floating drum (91).

2. offshore oil delivery gas transmission compliant riser pipeline according to claim 1, it is characterized in that: the end of described flexible pipe (2) is provided with hose coupling (21), described hose coupling (21) comprises the reinforcement hoop (213) of connecting tube (211) and strap bolt, described flexible pipe (2) is sheathed on the connecting tube (211), described reinforcement hoop (213) is sheathed on the connecting part of described flexible pipe (2) and connecting tube (211), and the outlet end of described connecting tube (211) is provided with the joint (212) that connects for installing.

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