A method for preparing hydrate samples in porous media with controllable hydrate distribution

A technique for porous media and sample preparation, which is applied in the preparation of test samples, etc., and can solve problems such as difficult comparison of experimental results

Active Publication Date: 2022-03-25
CHONGQING UNIV
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Problems solved by technology

[0004] Conventional methods use porous media to add water and methane gas to synthesize hydrates under appropriate temperature and pressure conditions. Due to the migration of water in porous media, the distribution of hydrates in porous media samples is random, and it is difficult to compare the experimental results between different samples.
At present, there is no effective method to prepare hydrate samples in porous media with controllable hydrate distribution.

Method used

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  • A method for preparing hydrate samples in porous media with controllable hydrate distribution

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0022] Such as figure 1 Shown, the present invention follows the steps:

[0023] Step 1. According to the required test hydrate samples, the test hydrate samples are layered (vein-shaped) or nodular hydrate samples identified based on on-site sampling, and the size and shape of the hydrate-containing area in the hydrate distribution pattern are prepared, 3D printing is adopted to form a corresponding 3D printing mold 1;

[0024] Step 2. According to the size of the hydrate-containing region in the hydrate distribution form to be prepared and the saturation degree of the hydrate, calculate the mass of the required dry porous medium and water;

[0025] Step 3. Weigh the corresponding material according to the amount of water required for the calculation and the mass of the dry porous medium, and mix the two evenly. After the mixing is completed, weigh the mix...

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Abstract

The invention discloses a method for preparing a porous medium hydrate sample with controllable hydrate distribution, which comprises the steps of: 1. generating a 3D printing mold; 2. calculating the mass of the porous medium and water required for drying; 3. mixing water and drying Porous media, 4. In the constant temperature freezer 3, prefabricated ice-containing porous media samples and low-temperature drying porous media samples, 5. Make the temperature of methane gas lower than freezing point; 6. Layer the low-temperature drying porous media samples and ice-containing porous media samples Fill the medium sample into the reaction kettle; 7. Fill the reaction kettle with low-temperature methane gas to the predetermined hydrate synthesis pressure, adjust the temperature of the high sample testing system 5 to the predetermined hydrate synthesis temperature, and synthesize hydrate. The artificial sample prepared by the invention of the method can simulate porous medium hydrate samples with different hydrate distributions under natural conditions, and provide porous medium hydrate samples closer to the natural state for scientific research.

Description

technical field [0001] The invention belongs to the technical field of natural gas hydrate testing, and in particular relates to a porous medium hydrate sample preparation method, which is suitable for artificially synthesizing porous medium natural gas hydrate samples indoors and simulating different natural gas hydrate reservoirs under natural conditions. Background technique [0002] Natural gas hydrate has the advantages of huge reserves, high efficiency and cleanliness, and is widely concerned as a future alternative energy source. Carrying out relevant research on the geophysical, mechanical properties, and mining methods of natural gas hydrate reservoirs is crucial to the realization of natural gas hydrate reservoir exploration. , stratum stability evaluation, and mining method optimization are of great significance. Since gas hydrates are easily decomposed under changes in temperature and pressure, it is difficult to obtain samples of gas hydrates in porous media for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28
CPCG01N1/28
Inventor 王兴王聪王馨罗永江李莉佳梁运培李波崔咏琪
Owner CHONGQING UNIV
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