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In-situ heat conductivity coefficient testing device and method for gas hydrate

A gas hydrate and thermal conductivity technology, applied in the field of gas hydrate thermal conductivity in-situ testing devices, can solve the problems of difficult hydrate samples and high hardness, and achieve the effects of smooth surface, dense interior, and accurate and reliable test values.

Inactive Publication Date: 2015-02-25
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to propose a device for in-situ synthesis of high-quality hydrate samples and accurate testing of hydrate thermal conductivity to synthesize high-quality hydrate samples and solve the problem of hydrate samples with high hardness and difficult compaction after formation problem, and overcome the problem that hydrate samples are difficult to conduct in-situ testing of thermal conductivity in a compacted and dense way

Method used

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  • In-situ heat conductivity coefficient testing device and method for gas hydrate

Examples

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Embodiment

[0028] Such as figure 1 As shown, an in-situ test device for thermal conductivity of gas hydrates includes a temperature-controllable and sealable reactor 7, a thermophysical property analysis tester 13, a data acquisition instrument 12, and a computer workstation 14. The bottom of the reactor 7 is Filled with a background material layer 6, the inner wall of the reactor 7 above the background material layer 6 is provided with a fluoroplastic layer 3, and the input end of the thermal physical property analysis tester 13 is a heat conduction probe 5, and the heat conduction probe 5 is set on the The opening on the side of the reaction kettle 7 extends into the reaction kettle 7, and is adhered to the upper surface of the background material layer 6 by structural glue, and the background material layer 6 is made of the same material as the structural glue, and also includes a The temperature sensor 10 at the bottom of the reaction kettle 7, and the inflating system that is charge...

example 1

[0052] Using carbon dioxide and distilled water as experimental materials, the invention is used to synthesize carbon dioxide hydrate samples and test thermal conductivity.

[0053] First open the reactor 7, clean the reactor 7, add 25ml of distilled water after drying, and cover the reactor 7. Thereafter, the reaction kettle 7 and pipeline air are blown away by charging and releasing high-pressure carbon dioxide gas several times. Close valves V1 and V2, keep other valves unblocked, let the reactor 7 be filled with high-pressure carbon dioxide gas slowly for about 5 minutes, when the pressure in the reactor 7 exceeds 3MPa, close the valve V6, open the valve V1 to release the gas in the reactor Carbon dioxide gas, when the pressure is close to 2-3atm, quickly close the valve V1; so repeatedly, the reaction kettle 7 is charged and released with high-pressure carbon dioxide gas, repeated 3-4 times. Reactor 7 air intake afterwards, when pressure reaches 3MPa, close reactor 7, le...

example 2

[0055] Taking tetrahydrofuran and distilled water as experimental materials, the invention is used to synthesize a tetrahydrofuran hydrate sample and test its thermal conductivity.

[0056] Take distilled water and heat it to boil for 30 minutes, remove the air dissolved in the distilled water, and prepare a 23% THF aqueous solution after cooling. Close the valves V1, V4 and V6, turn on the vacuum pump 2 to evacuate the reaction kettle 7 and the pipeline, and close the valve V5 after the vacuum is exhausted. Open the air bath 16 to cool down the reactor 7. The temperature of the air bath 16 is set at 4° C., and when the temperature of the reaction kettle 7 drops to about 4° C., it is maintained for 2 hours. Thereafter, the set temperature of the air bath 16 was lowered by 0.5° C. every hour. When the pressure reading in the kettle basically does not change, it can be considered that the hydrate reaction is basically over. Let stand for 3 days and let the hydrate age for 3 d...

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Abstract

The invention provides an in-situ heat conductivity coefficient testing device and method for a gas hydrate. The inner wall of a reaction kettle is lined with fluorine plastic material; before production of a gas hydrate, gas is highly dissolved; the super-cooling degree is adopted in the production process; the gas hydrate is generated under a gas-liquid interface in the reaction kettle; the obtained hydrate sample is flat in surface, compact in the interior and high in gas content; the hydrate sample is in full contact with a heat conduction probe arranged at the bottom of the reaction kettle, and high-pressure compaction is not needed; a heat conduction testing device comprises a set of thermophysical property analysis tester based on a transient plane thermal source method; the heat conduction probe is adhered to the surface of a background material layer; the background material layer is arranged flat at the bottom of the reaction kettle; the background material layer is adhered to a cylinder cured by a high-strength structural adhesive; the heat conduction probe is adhered to the background material layer by the same high-strength structural adhesive. The hydrate synthesized by the device and the method is high in quality; the heat conductivity coefficient test is simple in operation, convenient in data acquisition and accurate and reliable in test value.

Description

technical field [0001] The invention relates to the technical field of gas hydrates, in particular to an in-situ testing device for the thermal conductivity of gas hydrates and an in-situ testing method for the thermal conductivity of gas hydrates. Background technique [0002] The research progress of gas hydrate development technology fundamentally depends on the acquisition of high-quality physical property data and a deep understanding of the physical and chemical properties of natural gas hydrate. Reliable physical property data are essential for simulating natural gas hydrate accumulation and gas hydrate exploration. , Mining is of great significance. [0003] The preparation of high-quality gas hydrate samples is the key to obtaining reliable hydrate thermal conductivity in experimental tests. The laboratory usually prepares hydrate samples by hydration method, but the samples prepared by hydration method usually have the problem of loose samples and large pores, whi...

Claims

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Application Information

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IPC IPC(8): G01N25/48
Inventor 万丽华梁德青
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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