Negative pressure bucket for deep-water natural gas hydrate exploitation

Abstract

The present invention relates to the field of ocean engineering, and particularly to a negative pressure bucket for deep-water natural gas hydrate exploitation. The negative pressure bucket can be used for natural gas hydrate exploitation. The negative pressure bucket includes a bucket body and a connector; a communicating pipe and a support frame are arranged inside the bucket body; a high-pressure water nozzle and an air injection nozzle are arranged inside the negative pressure bucket; a water supply pipe, a gas supply pipe and a slurry return pipe are arranged inside the communicating pipe. By means of the negative pressure bucket, during the exploitation of deep-water natural gas hydrates, pipe cables can be connected, and communication with surface production facilities can be achieved through the internal inner conveying pipe. High-pressure water and gas can be injected into the seabed as needed, and the natural gas hydrate gas can be returned and collected through the slurry return pipe. At the end of the operation, the bucket body can be lifted and recycled for repeated use. The entire operation process is simple to operate, providing new equipment for deep-water natural gas hydrate exploitation, which is safe, efficient and has broad application prospects.

Description

Technical Field

[0001] The present invention relates to the field of ocean engineering, and particularly to a negative pressure bucket for deep - water natural gas hydrate exploitation. Background Art

[0002] Natural gas hydrate, also known as "flammable ice", is a kind of ice - like crystalline substance formed by natural gas and water under high - pressure and low - temperature conditions, distributed in deep - sea sediments or permafrost on land. Because of its ice - like appearance and ability to burn when encountering fire, it is also called "flammable ice". It has a high resource density and is widely distributed globally, with extremely high resource value, thus becoming a long - term research hotspot in the oil and gas industry. Since the 1960s, some countries represented by the United States, Japan, Germany, China, South Korea, and India have formulated research plans for natural gas hydrate exploration and development. So far, people have discovered more than 230 hydrate ore spots in offshore waters and permafrost areas, and a large number of hot research areas for natural gas hydrates have emerged.

[0003] From June to September 2013, high - purity natural gas hydrate samples were first drilled in the eastern waters of the Pearl River Estuary Basin along the coast of Guangdong, and considerable controlled reserves were obtained through drilling. On February 1, 2014, the basic research on the enrichment law and exploitation of natural gas hydrates in the South China Sea passed the acceptance, and a basic research system theory of "flammable ice" in the South China Sea of China was established. In May 2017, the Guangzhou Marine Geological Survey Bureau and PetroChina jointly used the Blue Whale No. 1 to successfully conduct a trial production using the pressure - reduction method. In May 2017, CNOOC used the Ocean Oil 708 exploration ship to successfully conduct a trial production using the solid fluidization method. On November 3, 2017, the State Council officially approved the listing of natural gas hydrate as a new mineral species. Therefore, the natural gas hydrate trial production technology has strong development potential in China.

[0004] To seize the new energy development market, it is necessary to strengthen the innovative research on scientific theories, technical methods, and supporting equipment in the field of natural gas hydrate exploration and development. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a negative pressure bucket for deep - water natural gas hydrate exploitation. This negative pressure bucket can be used for natural gas hydrate exploitation and can be recovered and reused at the end of construction operations.

[0006] The technical solution is as follows:

[0007] A negative pressure bucket for deep - water natural gas hydrate exploitation, the negative pressure bucket includes a barrel body and a connector; a communication pipe and a support frame are arranged inside the barrel body; a high - pressure water nozzle and an air injection nozzle are arranged inside the negative pressure bucket.

[0008] Further, a water supply pipe, a gas supply pipe, and a return slurry pipe are arranged inside the communication pipe;

[0009] Further, the lower end of the slurry return pipe is connected to the slurry return port;

[0010] Further, the lower end of the water supply pipe is connected to the horizontal water pipe;

[0011] Further, the other end of the horizontal water pipe is connected to the high-pressure water nozzle;

[0012] Further, the lower end of the gas supply pipe is connected to the gas injection nozzle;

[0013] Further, the other end of the connector is connected to the pipe cable and the offshore production facility.

[0014] The beneficial effects of the present invention are as follows:

[0015] By means of the negative pressure barrel, during the exploitation of deep-water natural gas hydrates, the pipe cable can be connected, and the connection with the offshore production facility can be realized through the internal inner conveying pipe. High-pressure water and gas can be injected into the seabed as needed, and the natural gas hydrate gas can be returned and collected through the slurry return pipe. At the end of the operation, the barrel can be lifted and recycled for repeated use. The whole operation process is simple and convenient, providing new equipment for the exploitation of deep-water natural gas hydrates, which is safe, efficient and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the negative pressure barrel for the exploitation of deep-water natural gas hydrates of the present invention;

[0017] Figure 2 is a sectional view taken along line A-A of the negative pressure barrel for the exploitation of deep-water natural gas hydrates of the present invention.

[0018] In the figure: 1 - barrel body, 2 - connecting pipe, 3 - support frame, 4 - horizontal water pipe, 5 - high-pressure water nozzle, 6 - slurry return port, 7 - gas injection nozzle, 8 - inner conveying pipe, 9 - connector, 10 - water supply pipe, 11 - gas supply pipe, 12 - slurry return pipe. DETAILED DESCRIPTION OF THE INVENTION

[0019] The present invention will be further specifically described below with reference to specific embodiments.

[0020] As Figure 1-2 shown, the negative pressure barrel for the exploitation of deep-water natural gas hydrates includes a barrel body 1 and a connector 9; a connecting pipe 2 and a support frame 3 are arranged inside the barrel body 1; a high-pressure water nozzle 5 and a gas injection nozzle 7 are arranged inside the negative pressure barrel.

[0021] A water supply pipe 10, a gas supply pipe 11 and a slurry return pipe 12 are arranged inside the connecting pipe 2;

[0022] The lower end of the slurry return pipe 12 is connected to the slurry return port 6;

[0023] The lower end of the water supply pipe 11 is connected to the horizontal water pipe 4;

[0024] The other end of the horizontal water pipe 4 is connected to the high-pressure water nozzle 5;

[0025] The lower end of the gas supply pipe 11 is connected to the gas injection nozzle 7;

[0026] The other end of the connector 9 is connected to the pipe cable and the offshore production facility.

[0027] It should be considered that the disclosed embodiments are illustrative in all aspects and not restrictive. The above embodiments can also be omitted, replaced, and changed in various forms without departing from the appended claims and their gist.

Claims

1. Negative pressure bucket for deep - water natural gas hydrate exploitation, comprising a barrel body (1) and a connector (9); It is characterized in that: It further includes a communicating pipe (2) connected to the connector (9). Inside the barrel body (1), there is a communicating pipe (2) from top to bottom and a support frame (3) supported between the communicating pipe (2) and the inner wall of the barrel body. At the bottom of the barrel body, there is also a high - pressure water nozzle (5). At the bottom of the barrel body, there is also an air injection nozzle (7). Inside the communicating pipe (2), there is also a slurry return pipe (12) sleeved. The lower end of the slurry return pipe (12) is connected to a slurry return port (6). The other end of the connector (9) is connected to a pipe cable and an offshore production facility.

2. The negative pressure bucket for deep - water natural gas hydrate exploitation according to claim 1, It is characterized in that: A water supply pipe (10) is sleeved inside the communicating pipe (2), and the high - pressure water nozzle is connected to the connector through the water supply pipe.

3. The negative pressure bucket for deep - water natural gas hydrate exploitation according to claim 2, It is characterized in that: An air supply pipe (11) is sleeved inside the communicating pipe (2), and the air injection nozzle is connected to the connector through the air supply pipe.

4. The negative pressure bucket for deep - water natural gas hydrate exploitation according to claim 3, It is characterized in that: The lower end of the water supply pipe (10) is connected to a horizontal water pipe (4).

5. The negative pressure bucket for deep - water natural gas hydrate exploitation according to claim 4, It is characterized in that: The other end of the horizontal water pipe (4) is connected to the high - pressure water nozzle (5).

6. The negative pressure bucket for deep - water natural gas hydrate exploitation according to claim 5, It is characterized in that: The lower end of the air supply pipe (11) is connected to the air injection nozzle (7).

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