Experimental method and device for simulating exploitation of gas hydrates

An experimental method and hydrate technology, which is applied in the fields of fluid mining, mineral mining, earth square drilling, etc., can solve the problems of lack of experimental simulation means and the inability to simulate the environment of hydrate formation, and achieve the effect of optimizing gas production rate and energy efficiency

Inactive Publication Date: 2009-11-11
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0009] CN 101050697A and CN 101046146A respectively propose a one-dimensional and two-dimensional exploitation simulation experimental device for natural gas hydrate. However, these devices cannot simulate the hydrate formation environment in which natural gas hydrate and underlying free gas coexist in actual seabed sediments
For the research on the three-dimensional production process of gas hydrate, the current research is mainly to establish mathematical physical mo

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  • Experimental method and device for simulating exploitation of gas hydrates
  • Experimental method and device for simulating exploitation of gas hydrates
  • Experimental method and device for simulating exploitation of gas hydrates

Examples

Experimental program
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Embodiment 1

[0072] Example 1: Experimental Simulation of Methane Hydrate Depressurization Exploitation

[0073] In this embodiment, as figure 1 In the natural gas hydrate mining simulation experiment device shown, the high-pressure reactor 12 is made of stainless steel, the effective height of the reactor 12 is 100mm, the inner diameter is 300mm, and the total volume is about 7L. The perforated steel plate 14 in the reactor divides the reactor into upper and lower parts, the volume of the upper part is about 6L, and the volume of the lower part is about 1L. After hydrate formation, the upper part of the porous steel plate 14 is hydrate deposits, and the lower part is free gas. The design pressure of the reactor 12 is 16MPa. 24 small perforations of Φ3mm and one large perforation of Φ8mm are arranged at different positions of the reactor cover 10 . Insert 16 thermal resistance temperature sensors 15 from the small perforation on the reactor cover to monitor the temperature in the reacto...

Embodiment 2

[0091] Example 2: Experimental Simulation of Methane Hydrate Recovery by Hot Water Injection

[0092] In this example, the main use figure 1 The experimental device shown in the figure simulates the process of methane hydrate production by intermittent hot water injection single well huff and puff. The simulation method is mainly carried out as follows:

[0093] (1) Lower the temperature of the low temperature bath control system 11 to about -1°C;

[0094] (2) Quartz sand (20~40 orders) and natural seawater are pressed water saturation 20%, after fully cooling in the environment of 0~1 ℃, mix evenly, put into the reaction kettle 12 until fully filling the reaction kettle ( In this embodiment, the porous partition 14 is not provided in the reaction kettle 12), and the porous medium can be appropriately compacted according to the experimental pressure (porosity 38.7%);

[0095] (3) cover reactor cover 10, insert thermal resistance temperature sensor 15 from the small perforati...

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Abstract

The invention provides an experimental method and a device thereof for simulating the exploitation of gas hydrates, wherein the method includes: underlying gas hydrates are generated in a reaction kettle which is provided with water-containing porous medium fill areas. In the step, experimental gas is led in from the lower part of the reaction kettle, thereby spreading the gas from bottom to top into the porous medium fill areas to generate hydrates. Then the hydrates generated are decomposed by adopting a voltage drop method, a heat injection method and or a chemical injection method; and thegas produced after decomposition of the hydrates is discharged out of the reaction kettle, thus simulating the process of exploitation of hydrates. In addition, the invention also provides a device specially designed for implementing the experimental method. The method and the device not only can make three-dimensional simulation of generation circumstance of the gas hydrates in marine sedimentsand the gas hydrates symbiotic with underlying free gas, but also can simulate exploitation of the hydrates by combining a single principle with a multi principle, and can realistically simulate the exploitation process of the gas hydrates.

Description

technical field [0001] The invention relates to an experimental method and device for simulating the exploitation of natural gas hydrate, which generates natural gas hydrate in a porous medium and adopts different exploitation modes to perform three-dimensional exploitation simulation of hydrate, and belongs to the technical field of marine natural gas hydrate exploitation. Background technique [0002] Gas hydrates are widely distributed in the slopes of continental islands, uplifts of active and passive continental margins, very low continental shelf oceans and deep water environments, and hydrates can store 160-180 m3 per cubic meter. 3 natural gas. It is generally believed that natural gas hydrate, as a clean and efficient energy source, will occupy an important position in the future energy structure. The exploration and development of gas hydrate as an energy resource has been highly valued by governments and research institutions all over the world, and the research ...

Claims

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Application Information

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IPC IPC(8): E21B43/01E21C50/00
CPCE21B2043/0115E21B41/0099
Inventor 孙长宇杨新陈光进粟科华赵新明
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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