Single pile leg loading system

Abstract

A single-pile-leg loading system is characterized in that a shuttle tanker is sequentially connected with a mooring stern cable, a mooring bow cable and a seabed single-point mooring device and fixed to a seabed in an anchoring mode, the seabed single-point mooring device is provided with a vertical pipe which is vertically arranged, a rotating joint is fixed in the vertical pipe, the top of the rotating joint is connected with a movable pipe section, and the bottom of the rotating joint is connected with a fixed pipe section; the movable pipe section is connected with a bow section loading hose, the fixed pipe section is connected with a submarine manifold, and the submarine manifold is connected with a submarine pipeline of a drilling production platform. A branch pipeline extends out of the seabed manifold, a double-stop release valve is arranged on the branch pipeline, the tail end of the branch pipeline is connected with a quick connector, the bottom of the rotary connector is further connected with an external leakage pipeline, and the other end of the external leakage pipeline is connected to a leakage storage tank. According to the invention, efficient oil product transmission between the drilling production platform and the shuttle tanker is realized; compared with the traditional offshore and deep sea single-point mooring system, the device has the characteristics of light weight (only one third of the weight of the traditional semi-submersible single-point mooring device), convenience in operation, safety, reliability and the like.

Description

Technical Field

[0001] The invention belongs to the field of ship construction and design, and in particular relates to a single pile leg loading system. Background Art

[0002] As human energy becomes increasingly scarce, oil extraction has gradually shifted from land to offshore and even deep sea.

[0003] The offshore crude oil transmission route is usually: the drilling production platform is transported to ordinary tankers through submarine pipelines, submarine manifolds, risers, single-point mooring devices and floating hoses. The single-point mooring device is divided into two parts, the lower part is the fixed part located underwater and anchored to the seabed; the upper part is the rotating part located above the water and rotates through bearings. The tanker is moored to the upper rotating part and moves along the fixed part as a weather vane through the bearing. At present, the single-point mooring device is usually semi-submerged in the water, which has the disadvantage of heavy structure and poor economic benefits.

[0004] In the deep sea, the oil transmission path is usually: the drilling production platform delivers oil to the tanker through the submarine wellhead, riser and production system through the unloading system (hose winch and mooring winch) on the deck of the drilling production platform. The disadvantages of this configuration are: 1. The transmission pipeline equipment connecting the submarine wellhead and the tanker is too expensive, including the riser, unloading system (hose winch, mooring winch and its control system); 2. The connection, separation and collection of the tanker and the unloading system cost too much manpower and material resources, and the efficiency is extremely low. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a single pile leg loading system, which aims to achieve the purpose of efficient oil product transmission between the drilling production platform and the shuttle tanker. The technical solution adopted is:

[0006] A single-pile-leg loading system, wherein a shuttle tanker is sequentially connected to a mooring stern cable, a mooring bow cable, and a submarine single-point mooring device, and is anchored and fixed to the seabed. The submarine single-point mooring device has a vertically arranged riser, a swivel joint is fixed inside the riser, a movable pipe section is connected to the top of the swivel joint, a fixed pipe section is connected to the bottom, the movable pipe section is connected to a bow section loading hose, the fixed pipe section is connected to a submarine manifold, and the submarine manifold is connected to a submarine pipeline of a drilling production platform.

[0007] A branch pipeline extends out of the submarine manifold, and a double shut-off relief valve is arranged on the branch pipeline. A quick-connect joint is connected to the end of the branch pipeline, and an external leakage pipeline is also connected to the bottom of the rotary joint, and the other end of the external leakage pipeline is connected to a leakage storage tank.

[0008] In the above-mentioned single pile leg loading system, further, the mooring stern cable and the mooring bow cable are connected through a functional block.

[0009] The above-mentioned single-leg loading system further comprises a step of fixing the bottom of the riser and inserting it into the seabed.

[0010] In the above-mentioned single pile leg loading system, further, the submarine manifold is connected to the submarine pipeline of the drilling production platform through a rotating flange, and the rotating flange is connected to a pressure sensor.

[0011] In the above-mentioned single pile leg loading system, further, a ball valve is arranged on the seabed manifold.

[0012] In the above-mentioned single pile leg loading system, further, the swivel joint is fixed inside the riser through a bracket.

[0013] The present invention realizes efficient oil product transmission between the drilling production platform and the shuttle tanker. Compared with the traditional offshore and deep-sea single-point mooring systems, it has the characteristics of light weight (only one-third of the weight of the traditional semi-submersible single-point mooring device), convenient operation, safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention;

[0015] Figure 2 It is a schematic diagram of the structure of a single-point mooring device on the seabed;

[0016] Among them, 1-shuttle tanker, 2-mooring stern cable, 3-functional block, 4-mooring bow cable, 5-submarine single-point mooring device, 6-seabed, 7-submarine pipeline of drilling production platform, 8-rotating flange, 9-pressure sensor, 10-submarine manifold, 11-ball valve, 12-forward section loading hose, 13-stern section loading hose, 14-pipe section-15 end valve, 16-branch pipeline, 17-double stop-and-release valve, 19-quick plug connector, 20-external leakage pipeline, 21-leakage storage tank, 5.1-riser, 5.3-fixed pipe section, 5.4-movable pipe section, 5.5-rotating joint. DETAILED DESCRIPTION

[0017] The present invention will be further described in conjunction with the accompanying drawings.

[0018] A single-leg loading system, a shuttle tanker is connected with a mooring stern cable, a mooring bow cable, and a submarine single-point mooring device in sequence, the mooring stern cable and the mooring bow cable are connected through a functional block, and the anchor is fixed to the seabed. The submarine single-point mooring device has a vertically arranged riser, a swivel joint is fixed inside the riser, a movable pipe section is connected to the top of the swivel joint, a fixed pipe section is connected to the bottom, the movable pipe section is connected to the bow section loading hose, the fixed pipe section is connected to the submarine manifold, and the submarine manifold is connected to the submarine pipeline of the drilling production platform. The submarine manifold is connected to the submarine pipeline of the drilling production platform through a swivel flange, the swivel flange is connected to a pressure sensor, a ball valve is arranged on the submarine manifold, and the swivel joint is fixed inside the riser through a bracket. A pressure sensor is arranged on the swivel flange to transmit the internal pressure of the submarine pipeline to the monitoring system to form pressure protection. The ball valve is in a normally open state and is equipped with a valve closing interface. When the submarine single-point mooring device needs to be disassembled and repaired, an underwater robot is used to dock with the valve closing interface of the ball valve to realize the valve closing action.

[0019] The submarine manifold has a branch line extending out, and a double stop-and-release valve is installed on the branch line. The end of the branch line is connected to a quick-connect joint, and the bottom of the rotary joint is also connected to an external leakage line, and the other end of the external leakage line is connected to a leakage storage tank. It is used to clean the entire loading system so that the system can be repaired and the pipes can be cleaned before disassembly to prevent oil leakage caused by disassembly. The underwater robot injects flushing fluid into the submarine manifold through the quick-connect joints, branch lines, and double stop-and-release valves of the flushing system components to clean the entire loading system.

[0020] The submarine single point mooring device is anchored to the seabed by fixing it with a single pile leg.

[0021] The leakage storage tank is connected to the bottom of the rotary joint through an external leakage pipeline, which is used to store oil and display the amount of oil leakage.

Claims

1. A single pile leg loading system, characterized in that: The shuttle tanker is connected to the mooring stern cable, mooring bow cable and submarine single-point mooring device in sequence and anchored to the seabed. The submarine single-point mooring device has a vertically arranged riser with a swivel fixed inside the riser. The top of the swivel is connected to a movable pipe section and the bottom is connected to a fixed pipe section. The movable pipe section is connected to the bow section loading hose, and the fixed pipe section is connected to the submarine manifold. The submarine manifold is connected to the submarine pipeline of the drilling production platform. A branch pipeline extends out of the submarine manifold, and a double shut-off relief valve is arranged on the branch pipeline. A quick-connect joint is connected to the end of the branch pipeline, and an external leakage pipeline is also connected to the bottom of the rotary joint, and the other end of the external leakage pipeline is connected to a leakage storage tank.

2. A monopile leg loading system according to claim 1, characterized in that: The mooring stern cable and mooring bow cable are connected through function blocks.

3. A monopile leg loading system according to claim 1, characterized in that: The bottom of the fixed riser is inserted into the seabed.

4. A monopile leg loading system according to claim 1, characterized in that: The submarine manifold is connected to the submarine pipeline of the drilling production platform through a rotating flange, and the rotating flange is connected to a pressure sensor.

5. A monopile leg loading system according to claim 1, characterized in that: A ball valve is provided on the submarine manifold.

6. A monopile leg loading system according to claim 1, characterized in that: The swivel joint is fixed inside the riser by a bracket.

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