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Experimental method and experimental device for measuring sand produced by hydrate dissociation and seepage

A technology of hydrate decomposition and experimental method, applied in the field of natural gas hydrate exploitation, can solve problems such as shortage, production trial production reduction, wellbore instability, etc.

Active Publication Date: 2015-09-30
INST OF MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

Internationally, in the process of gas hydrate trial production, the problem of sand production after hydrate decomposition is serious, causing disasters such as production reduction, suspension of trial production, and wellbore instability. , multi-field and multi-phase coupling problems of skeleton deformation, but there is still a lack of research in this area

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  • Experimental method and experimental device for measuring sand produced by hydrate dissociation and seepage
  • Experimental method and experimental device for measuring sand produced by hydrate dissociation and seepage

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Embodiment Construction

[0030] see figure 1 , figure 2 , an embodiment of the present invention provides an experimental method for measuring sand production caused by hydrate decomposition seepage, comprising the following steps:

[0031] Step 1, fill the sample tube 1 with experimental materials to prepare a simulated hydrate deposition layer; the room temperature is controlled at -20°C to 50°C, the diameter of the sample tube is 4cm, and the length is 100cm; the experimental materials can be sand or clay with different particle gradations .

[0032] Step 2, place the sample tube 1 in an environment of 8MPa-30MPa, 0°C-10°C (preferably 2°C-10°C) to simulate the preparation and decomposition of hydrate; specifically, set the sample tube 1 in a closed container 2 , and are sealed with each other, the sample tube 1 and the airtight container 2 are filled with a loading medium, the loading medium can be hydraulic oil or antifreeze, and the airtight container 2 is connected with a confining pressure l...

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Abstract

The invention provides an experimental method and an experimental device for measuring sand produced by hydrate dissociation and seepage. The experimental method comprises the following steps: filling a sample tube with an experimental material to simulate a hydrate sediment layer; placing the sample tube in an environment with the pressure of 8-30MPa and at a temperature of 0-10 DEG C; filling the sample tube with methane gas and water to simulate hydrate dissociation and production; simulating hydrate dissociation and seepage through a filter screen, wherein a water-sand-gas mixture in the sample tube passes through the filter screen and then methane gas and a mixture of water and part of sand flow out; and enabling the methane gas to flow upwards through a flow meter to obtain the volume of the methane gas, and enabling the water and sand mixture to flow downwards through a nuclear magnetic resonance measurement module to obtain the volume of sand. The experimental method and the experimental device can be used for measuring the temperature and pressure, the sand production rate, the gas output and the water flow during hydrate dissociation and seepage in real time, thereby providing a scientific basis and a technical support for predicting sand produced by hydrate production and making control measures.

Description

technical field [0001] The invention relates to natural gas hydrate exploitation technology, in particular to an experimental method and an experimental device for measuring sand production caused by hydrate decomposition seepage. Background technique [0002] Natural gas hydrate is an unconventional energy resource with huge reserves and clean energy, and it is also one of my country's strategic energy sources. Internationally, in the process of gas hydrate trial production, the problem of sand production after hydrate decomposition is serious, causing disasters such as production reduction, suspension of trial production, and wellbore instability. , Multi-field and multi-phase coupling problems of skeleton deformation, but there is still a lack of research in this area. Therefore, the present invention proposes an experimental device and an experimental method for measuring sand production caused by hydrate decomposition seepage. Contents of the invention [0003] The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
Inventor 张旭辉鲁晓兵王淑云赵京王爱兰刘昌岭刘乐乐
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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