A multi-mode mining simulation device and method for different types of natural gas hydrate reservoirs

A simulation device and simulation method technology, applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve problems such as lack of

Active Publication Date: 2021-11-19
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, researchers have carried out a large number of experiments and numerical simulation studies on the production of hydrates, but there is a lack of experimental devices and methods that can be used to simulate natural gas hydrate production in different reservoirs, different production wells, and different production methods at the same time. method

Method used

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  • A multi-mode mining simulation device and method for different types of natural gas hydrate reservoirs
  • A multi-mode mining simulation device and method for different types of natural gas hydrate reservoirs
  • A multi-mode mining simulation device and method for different types of natural gas hydrate reservoirs

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Embodiment 1

[0044] Embodiment one, refer to figure 1 , this embodiment proposes a multi-mode mining simulation device for different types of natural gas hydrate reservoirs, including a high-pressure reactor 2, a production well 11, a temperature control device, a pressure control device, a gas supply and liquid supply device, and a gas-liquid separation device and data acquisition devices.

[0045] The bottom of the autoclave 2 is provided with a base 1; the bottom of the autoclave 2 is evenly provided with a plurality of multi-point measuring thermocouples 3; the center position of the upper cover of the autoclave 2 is provided with a sand control filter layer; There are four visualization windows 25; the upper cover of the autoclave 2 is connected to the kettle body through screws 26, and a sealing gasket 27 is arranged at the contact between the upper cover and the inside of the kettle body;

[0046] The inlet pipeline of the production well 11 is connected with the high-pressure reac...

Embodiment 2

[0056] Embodiment 2, this embodiment proposes a multi-mode mining simulation method for different types of natural gas hydrate reservoirs, combining figure 1 The specific steps are described as follows:

[0057] (1) Determine the type of simulated water hydrate reservoir: open the upper cover of the autoclave 2, and fill the autoclave with sediment or a mixture of sediment and ice powder, etc., according to the type of simulated water hydrate reservoir required. , Install the upper cover of the autoclave. Specifically, the types of simulated water hydrate reservoirs are divided into four types: Class 1, Class 2, Class 3 and Class 4;

[0058] A) When simulating the synthesis of Class 1 hydrate reservoirs, first open the water bath 20 to lower the temperature in the autoclave 2 to below zero, open the upper cover of the autoclave 2, and fill a small amount of non- Aqueous deposits and compaction, which are then filled with a mixture of sediment and ice powder and compacted;

...

Embodiment 3

[0072] Embodiment 3, this embodiment proposes a multi-mode mining simulation method for different types of natural gas hydrate reservoirs, the difference from Embodiment 2 lies in step (3), also refer to figure 1 ,Described as follows:

[0073] Step (3), open the manhole cover 28 at one end of the production well 11, fill the deposit of supersaturated water in the production well 11, after installing the manhole cover 28, adjust the angle of the rotating pipe 24 connected with the production well 11 so that the production well 11 is placed horizontally . This scheme is used to simulate the situation where the gas-water after hydrate decomposition near the production well 11 flows through the sediment containing supersaturated water after the hydrate decomposition near the production well 11 is completed as the seabed natural gas hydrate is continuously exploited.

[0074] Other steps are similar to Embodiment 2, and will not be repeated here.

[0075] The methods proposed in...

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Abstract

A multi-mode production simulation device and method for different types of natural gas hydrate reservoirs. The production well is connected to the high-pressure reactor through a rotary pipe that can be adjusted at any angle, and the high-pressure reactor and the production well are both provided with visualization windows. The invention can obtain production wells with different angles by adjusting the rotating tube, including vertical wells, horizontal wells, and inclined wells; it can simulate and synthesize various types of natural gas hydrate reservoirs in a high-pressure reactor; it can simulate depressurization methods, heat injection Natural gas hydrates can be exploited using the method, inhibitor injection method and combined method; the formation, decomposition and secondary generation of hydrates and the flow of gas and water can be monitored throughout the experiment, and the water production and gas production can be obtained. After the hydrate samples are synthesized in the high-pressure reactor, the present invention can systematically carry out mining simulation experiments of natural gas hydrate under different hydrate reservoirs, different production wells, and different production methods, and can conduct efficiency comparisons for different hydrate production modes. assess safety.

Description

technical field [0001] The invention belongs to the technical engineering field of energy exploitation, and in particular relates to a multi-mode exploitation simulation device and method for different types of natural gas hydrate reservoirs. Background technique [0002] Natural gas hydrate is a non-stoichiometric cage compound formed by gas and water under low temperature and high pressure. It is widely stored in the continental margin seabed and permafrost sediments in nature. It has large reserves, wide distribution, and shallow burial. , high energy density and clean combustion, it is known as one of the most promising new energy sources in the 21st century. At present, many successful trial productions of natural gas hydrates have been carried out in the world, but none of them have reached the level of commercial production, and each trial production has cost a lot of money. Therefore, by simulating the natural hydrate formation environment and the process of hydrate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B43/01E21B43/24E21B43/22E21B47/00E21B47/10E21B47/06E21B47/07
CPCE21B43/01E21B43/16E21B43/24E21B47/06E21B47/10E21B49/001E21B41/0099E21B47/001E21B47/07
Inventor 宋永臣杨明军赵洁赵佳飞蒋兰兰
Owner DALIAN UNIV OF TECH
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