Method and device for testing formation and decomposition of gas hydrate

A technology of hydrate formation and testing methods, applied in the direction of material resistance, etc., can solve the problems of less ion changes, difficult ionization, and difficult measurement

Inactive Publication Date: 2010-05-19
CHINA NAT OFFSHORE OIL CORP +2
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Problems solved by technology

However, the resistance method cannot be used in the methane-pure water-sediment system, because the resistance method is based on the change of the ion content in the s...

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  • Method and device for testing formation and decomposition of gas hydrate
  • Method and device for testing formation and decomposition of gas hydrate
  • Method and device for testing formation and decomposition of gas hydrate

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Embodiment Construction

[0017] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0018] The inventive method comprises the following steps:

[0019] 1) Fill the one-dimensional sand-filled resistivity model tube with sand, cover the end cap, check the tightness of the model tube, and then put the model tube into a constant temperature box;

[0020] 2) Inject water and methane gas into the model tube, and keep the constant temperature in the constant temperature box, so that the natural gas hydrate is gradually generated, and the temperature, pressure sensor and electrode installed on the wall of the model tube are respectively detected in the model tube. The change value of pressure and resistivity with time, the detected data is transmitted to a data acquisition module for recording and storage;

[0021] 3) When the natural gas hydrate is decomposed, the model pipe passes through a back pressure control module to open the model ...

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Abstract

The invention relates to a method and device for testing formation and decomposition of gas hydrate. The method comprises: 1) filling a one-dimensional sand-filling resistivity model tube with sand, closing an end cover, checking leak tightness and putting the model tube into a thermostat; 2) injecting water and methane gas into the model tube, maintaining constant temperature state to gradually generate hydrate, detecting change values of temperature, pressure and resistivity in the tube through a thermocouple, a pressure sensor and an electrode arranged on the wall of the model tube respectively and transmitting the change values to a data acquisition module; 3) reducing pressure after opening the model tube through a back pressure control module during decomposition so as to gradually decompose the hydrate, or injecting hot water into the model tube so as to gradually decompose the hydrate; and 4) passing water and methane gas produced after decomposition through a measurement module, transmitting data to the data acquisition module, detecting the change values of the pressure, the temperature and the resistivity in the tube through the thermocouple, the pressure sensor and the electrode at the same time, transmitting the change values into the data acquisition module, recording and storing the change values. The method and the device can be widely applied in the field of various detection of the formation and decomposition of gas hydrate.

Description

technical field [0001] The invention relates to a natural gas hydrate (Natural Gas Hydrates, NGH) test method, in particular to a test method and device for the formation and decomposition of natural gas hydrate in a one-dimensional sand filling model in the field of marine technology. Background technique [0002] Natural gas hydrate is an ice-like solid crystal composed of natural gas and water molecules. Natural gas is mainly composed of methane, so it is also called methane hydrate. Because it contains a large amount of methane gas, it has extremely strong combustion power and can be burned directly, so it is also commonly known as "combustible ice". The energy density of natural gas hydrate is very high, which can produce a large amount of methane gas, and the reserves of natural gas hydrate are very rich. The combustion of natural gas hydrate only produces carbon dioxide and water, and will not pollute the environment. It is a rare green and clean energy. As a potenti...

Claims

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Application Information

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IPC IPC(8): G01N27/04
Inventor 李清平李淑霞王志君周建良陈月明姚海元白玉湖喻西崇朱振宇
Owner CHINA NAT OFFSHORE OIL CORP
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