Multimode exploitation simulation device and method for different kinds of natural gas hydrate reservoirs

A simulation device and simulation method technology, applied in the fields of fluid extraction, earthwork drilling, measurement, etc., can solve problems such as lack of

Active Publication Date: 2019-04-26
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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  • Multimode exploitation simulation device and method for different kinds of natural gas hydrate reservoirs
  • Multimode exploitation simulation device and method for different kinds of natural gas hydrate reservoirs
  • Multimode exploitation simulation device and method for different kinds 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

The invention discloses a multimode exploitation simulation device and method for different kinds of natural gas hydrate reservoirs. A production well is connected with a high pressure reactor througha rotary tube with an angle capable of being adjusted at will, and the high pressure reactor and the production well are both provided with visual windows. According to the multimode exploitation simulation device disclosed by the invention, production wells with different angles, including a vertical shaft, a horizontal shaft and an inclined shaft, can be obtained by adjusting the rotary tube. Multiple kinds of natural gas hydrate reservoirs can be simulated and synthesized in the high pressure reactor; a pressure reducing method, a heat injecting method, an inhibitor injecting method and acombined method can be simulated to exploit natural gas hydrate; the generation, decomposition and secondary generation situations of the hydrate and the gas-water flowing situation can be monitored in the whole experiment process and the water yield and the gas yield can be obtained. According to the multimode exploitation simulation device, a hydrate sample in the high pressure reactor is synthesized, natural gas hydrate exploitation simulation experiments can be systematically performed under different hydrate reservoirs, different production wells and different exploiting methods, and efficiency and safety evaluation can be performed for different hydrate exploiting modes.

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 Applications(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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