Porous medium hydrate sample preparation method with controllable hydrate distribution
A technology for porous media and sample preparation, which can be used in the preparation of test samples, etc., and can solve the problems of difficulty in comparing experimental results.
Active Publication Date: 2020-01-03
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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[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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The invention discloses a porous medium hydrate sample preparation method with controllable hydrate distribution. The method includes the following steps: 1. generating a three-dimensional (3D) printing mold; 2. calculating the mass of a required dry porous medium and water; 3. mixing the water and the dry porous medium; 4. in a constant-temperature refrigerator 3, prefabricating an ice-containingporous medium sample and a low-temperature dry porous medium sample; 5. making the temperature of a methane gas lower than the ice point; 6. filling the low-temperature dry porous medium sample and the ice-containing porous medium sample into a reaction kettle by layers; and 7. filling a low-temperature methane gas into the reaction kettle until a predetermined hydrate synthesis pressure is reached, regulating the temperature of a sample testing system 5 to a predetermined hydrate synthesis temperature, and synthesizing a hydrate. An artificial sample prepared by this method can simulate a porous medium hydrate sample with different hydrate distribution under natural conditions, and provide a more natural porous medium hydrate sample 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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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