CN102704888A - Novel underwater manifold sledge - Google Patents

Abstract

The invention discloses a novel underwater manifold sledge. The novel underwater manifold sledge comprises a main pipe, branch pipes, supports, a base structure, three-way devices, flanges, a bending pipe, an underwater pipeline connector, an underwater pipe cleaner and a valve, wherein the main pipe and the branch pipes are respectively fixed on the base structure by the supports; the branch pipes are connected into the main pipe by the three-way devices; the tail end of the horizontal section of the main pipe is connected with the bending pipe by the flange; the pipeline is changed from the horizontal direction to the vertical direction, and the tail end of the pipeline is provided with the underwater pipeline connector to be connected with the underwater pipe cleaner; the underwater pipe cleaner is detachable; the underwater pipeline connector is connected with an upper blind plate for plugging; the start end of the horizontal section of the main pipe is provided with a flange three-way device with a valve; and the branch pipe of the flange three-way device is connected with the valve and can be connected with the blind flange. The novel underwater manifold sledge disclosed by the invention has the advantages that since the valve and the flange three-way device with the valve are arranged on the main pipeline, productions at two well areas can be safely isolated, and detection of the production state can be realized; the valve can realize underwater robot operation, so that the operability of the underwater manifold sledge is effectively improved; and the novel underwater manifold sledge is simple in structure, is practical and effective and is suitable for the need of deep-ocean development.

Description

A new type of underwater manifold skid

technical field

The invention relates to a novel underwater manifold skid.

Background technique

The subsea manifold skid is one of the important facilities of the subsea production system, and its invention and development are of great significance to the development of deepwater oil and gas fields. The current commonly used underwater manifold skids have the following disadvantages: 1. No pigging function. Existing manifold skids generally do not have an underwater pigging interface, and the pigs cannot be connected to the underwater manifold skid for pigging operations, which may cause oil deposits inside the submarine pipeline, thereby causing blockage, corrosion and environmental damage to the pipeline. Pollution risk; 2. No isolation and detection function. When the underwater production system involves two or more well areas, if the drilling and completion operations and production time of each well area are inconsistent, it is necessary to isolate the oil and gas in the two well areas with valves. The existing underwater manifold skid It is impossible to isolate the production of each well area, and there is no way to detect the isolation effect of the valve. If the oil and gas in the first production well area enters other well areas, it will pose a great risk to the safety of other well areas. 3. The valve cannot be operated by underwater robots. The use of saturation diving operations, firstly, the operating sea conditions are limited, and the support of proprietary dynamic positioning ships is required; secondly, the operating efficiency is low and there are high safety risks.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the commonly used underwater manifold skids, and provide a novel manifold skid with pigging functions, isolation and detection functions, and underwater robot-operated valves.

The invention consists of a main pipe, a main pipe support, a branch pipe, a branch pipe support, a base structure, a variable diameter tee, a connecting flange, an elbow, an underwater pipe connector, an underwater pig, a flange tee, a valve and a blind flange The main pipe and the branch pipe are respectively fixed on the base structure of the manifold skid through the main pipe support and the branch pipe support. The branch pipe is connected to the main pipe through the reducing tee. Turn from horizontal to vertical, and set the pigging interface at its end, that is, the underwater pipeline connector. The underwater pipeline connector is connected to the underwater pig. The underwater pig can be removed and connected to the underwater pipeline connector. The blind plate blocks it, and a flange tee with a valve is set at the beginning of the horizontal section of the main pipe. The flange tee is connected to the valve and can be connected to the blind flange.

In the present invention, an underwater pig can be installed according to needs through the underwater pipeline connector to realize the underwater pigging function; through the isolation valve on the main line and the flange tee with the isolation valve, the production in the two well areas can be safely isolated, and the It can realize the detection of production status. The valve can realize underwater robot operation, which effectively improves the maneuverability of the underwater manifold skid. The structure is simple, practical and effective, and is suitable for the needs of deep sea development.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

In the figure 1. Main pipe, 2. Main pipe support, 3. Branch pipe, 4. Branch pipe support, 5. Base structure, 6. Reducing tee, 7. Connecting flange, 8. Elbow pipe, 9. Underwater pipe connector , 10. Underwater pig, 11. Flange tee, 12. Valve, 13. Blind flange.

Detailed ways

As shown in Figure 1, the main pipe 1 and the branch pipe 3 on the underwater manifold skid are respectively fixed on the base structure 5 of the manifold skid through the first main pipe support 2 and the second branch pipe support 4, and the branch pipe 3 is connected through a reducing tee 6 Enter Supervisor 1.

The end of the horizontal section of the main pipe 1 is connected to the elbow 8 through the connecting flange 7, and the elbow 8 changes the direction of the pipeline from horizontal to vertical. connected to the pig 10, and the pigging operation can be carried out by sending the pigging ball through the underwater pig 10; when the pigging operation is not required, the underwater pig 10 can be removed and connected to The upper blind plate blocks it.

Set a flange tee 11 with a valve at the beginning of the horizontal section of the main pipe 1. When the isolation and sealing test is not required, close the valve 12 of the flange tee 11 and connect the blind flange 13; when isolation and sealing are required During detection, the valve 12 of the flange tee 11 is opened, and the blind flange 13 is removed.

At the end of the main line 1, an underwater pig interface, that is, an underwater pipeline connector, is reserved. If no pigging operation is performed, a blind plate is connected to the underwater pipeline connector 9 for sealing. If it is necessary to carry out pigging operations, the blind plate of the underwater pipeline connector is lifted with the assistance of the underwater robot, and the underwater pig 10 and the underwater pipeline connector 9 are firmly connected together, and the underwater pipe connector 9 is connected together again. With the assistance of the robot, the underwater pig 10 with the underwater pipeline connector is lowered and locked with the underwater manifold by means of the underwater pipeline connector. Since the underwater pig 10 is pre-installed with a plurality of pigging balls on the water surface, it can be realized to launch the pigging balls underwater according to different interval requirements.

Design and install a valve 1 with a large diameter on the main line 1 to isolate the two wells that can be produced separately at different times, and then design and install a three-flange connection 11 with an isolation valve on the main line to install detection components . If the two well areas need to produce at the same time, open the isolation valve on the main line. If the two well areas are not in production at the same time, the detection element can be installed on the flange tee with isolation valve to detect the isolation status of the production well area and the non-production well area.

Since all valves of the underwater manifold skid are equipped with underwater robot operation interfaces, all valves on the underwater manifold skid of the present invention can be operated by underwater robots.

Through the underwater pipeline connector, an underwater pig can be installed as needed to realize the underwater pigging function; through the isolation valve on the main line 1 and the flange tee 11 with the isolation valve, the production in the two well areas can be safely isolated, and It can realize the detection of production status. The valves on the underwater manifold skid can realize underwater robot operation, which effectively improves the operability of the underwater manifold skid. The structure is simple, practical and effective, and is suitable for the needs of deep sea development.

Claims (1)

1. A new type of underwater manifold skid, consisting of main pipe, main pipe support, branch pipe, branch pipe support, base structure, reducing tee, connecting flange, elbow pipe, underwater pipe connector, underwater pig, method Composed of blue tee, valve and blind flange, it is characterized in that: the main pipe (1) and the branch pipe (3) are respectively fixed on the manifold skid base structure (5) through the main pipe support (2) and the branch pipe support (4), and the branch pipe (3) Connect to the main pipe (1) through the reducing tee (6), the end of the horizontal section of the main pipe (1) is connected to the elbow (8) through the connecting flange (7), and the elbow (8) changes the direction of the pipeline from the horizontal Turn into vertical, and the underwater pipeline connector (9) is set at its end, and the underwater pipeline connector (9) is connected with the underwater pig (10), and the underwater pig (10) is detachable. Connect the blind plate to the pipe connector (9) to block it, and set a flange tee (11) with a valve at the beginning of the horizontal section of the main pipe (1), and the flange tee (11) and the valve (12) Link to each other, can be connected with blind flange (13).

Images