Preparation method of hydrate deposit sample

A hydrate sediment and sample preparation technology, applied in the field of hydrate sediment research, can solve the problems of long period and poor representation, achieve the effect of short period and promote natural balanced distribution

Active Publication Date: 2014-01-15
北京中科力森科技有限公司
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the problems of long period and poor representativeness of the laboratory hydrate sediment sample preparation in the prior art, and propose a new type of hydrate sediment sample preparation method, which can speed up the process of hydrate sediment sample preparation. Preparation cycle

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  • Preparation method of hydrate deposit sample
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preparation example Construction

[0021] The invention provides a novel method for preparing hydrate sediment samples. The method is to provide a certain temperature gradient or salinity gradient or a combination of the two methods along the sample height direction during the preparation of the hydrate sediment sample, so that the hydrate is gradually and uniformly formed in the sediment pores.

[0022] Specifically, the present invention includes two steps:

[0023] 1. Inject natural gas from one end of the sediment sample, wherein the salt content of the sediment sample from the inlet end to the gas outlet end has a gradient from high to low, and / or, the temperature of the sediment sample from the inlet end to the gas outlet end varies from high to low. Low has a gradient, so that the sediment samples at the gas outlet first form hydrates, and then gradually extend to the sediment samples at the inlet to form hydrates;

[0024] 2. After the sediment samples at the inlet end form hydrates, the sediment sampl...

Embodiment 1

[0027] Embodiment one, adopt salinity gradient mode

[0028] like figure 1 As shown, for the sample preparation method of hydrate-containing sediments with controlled salinity gradient, taking soil mechanics triaxial sample preparation as an example, first prepare N parts of aqueous solutions with different salinities, and N is an integer greater than 2. Taking N equal to 5 as an example, the salinity of the preparation solution is 0%, 5%, 10%, 15%, and 20% respectively; then the aqueous solution is mixed with the test soil, and then divided into 5 layers according to the order of solution concentration from large to small Crush into a sample; then inject a certain pressure of methane gas from the bottom of the sediment sample (at the inlet end, with a salinity of 20%), and maintain the temperature, pressure and salinity conditions so that the sediment pores containing pure water are the first to form Hydrate.

[0029] The synthesis process is as follows: for example, referr...

Embodiment 2

[0032] Embodiment two, adopt temperature gradient mode

[0033] like figure 2 As shown, for the sample preparation method of hydrate-containing sediments with controlled temperature gradient, taking the preparation of soil mechanics triaxial samples as an example, the sediment samples are first compacted according to a certain water content; Methane gas at a certain pressure, maintaining temperature and pressure conditions can make hydrates first form in the top sediment pores, that is to say, the top (gas outlet) temperature is lower, and the bottom (intake end) temperature is higher.

[0034] The synthesis process is as follows: For example, referring to Table 1, when the gas pressure is 4.3MPa, assuming that the sample length is L, the temperature at the 1 / 5 point from the top of the sample is controlled to be 4°C, and the temperature in the 0-1 / 5L section is lower than this value, 1 / If the 5L-4 / 5L section is higher than this value, then the hydrate in the 0-1 / 5L section...

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Abstract

The invention discloses a preparation method of a hydrate deposit sample, which comprises the steps that natural gas is injected from one end of a deposit sample, wherein the salt content of the deposit sample from a gas inlet end to a gas outlet end has a high-low gradient, and / or the temperature of the deposit sample from the gas inlet end to the gas outlet end has a high-low gradient, so that the deposit sample at the gas outlet end forms hydrate first, and then the deposit sample at the gas inlet end gradually forms hydrate. According to the method, hydrate can be synthesized at the gas outlet end first by temperature or salinity gradient control or temperature and salinity gradient control combination at the gas inlet end and the gas outlet end of the sample; after the required hydrate content is reached, natural balance distribution of moisture is facilitated by temperature oscillation; and therefore, the method for preparing a hydrate-containing deposit is short in period, wide in hydrate content control range and good in uniformity.

Description

technical field [0001] The invention relates to the field of hydrate deposit research, in particular to a method for preparing a hydrate deposit sample. Background technique [0002] Gas hydrate is an ice-like solid compound formed by natural gas and water under high pressure and low temperature conditions, and is a strategic energy source in the 21st century. Hydrate deposits are widely distributed in terrestrial permafrost environments and deep-water formation environments such as oceans and lakes. Due to the phase transition of hydrates under the disturbance of temperature or pressure, it is very difficult to obtain complete samples of hydrate deposits from the field, and indoor research is required. The preparation of uniform hydrate deposits with different hydrate contents is the most critical link in the laboratory research on the measurement of the mechanical properties of hydrate deposits, hydrate mining and safety simulation. [0003] At present, there are mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
Inventor 张旭辉鲁晓兵刘昌龄业渝光
Owner 北京中科力森科技有限公司
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