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Experiment simulation system for exploiting natural gas hydrate by using CO2

An experimental simulation and hydrate technology, which is applied in the fields of fluid extraction, earth-moving drilling, climate sustainability, etc., and can solve problems such as few devices and inability to meet research needs.

Inactive Publication Date: 2011-06-15
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, the mining of hydrates is basically in the stage of experimental simulation research. Regarding the comprehensive experimental simulation of CO 2 There are still relatively few devices for exploiting natural gas hydrates, which cannot meet the requirements for CO 2 Research needs for displacement mining

Method used

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  • Experiment simulation system for exploiting natural gas hydrate by using CO2
  • Experiment simulation system for exploiting natural gas hydrate by using CO2
  • Experiment simulation system for exploiting natural gas hydrate by using CO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0031] see figure 1 As shown, a CO 2 The experimental simulation system for natural gas hydrate exploitation includes CH4 supply system, CO 2 Five systems including supply system, hydrate reactor 35, refrigeration system, gas recovery system and data acquisition system:

[0032] The CH4 supply system mainly includes sequentially connected CH 4 A gas cylinder 1, a pressure sensor 25, a pressure regulator 29, a buffer tank 31, a mass flow meter 33, and a hydrate reactor 35 are connected. CH 4 Gas cylinder 1 provides CH for the hydrate production in the early stage of the experiment 4 Air source, pressure regulator 29 will come from CH 4 The gas source pressure of the gas cylinder 1 is adjusted to an experimental set value, the function of the buffer tank 30 is to stabilize the pressure, and the pressure sensor 25 measures CH 4 The pressure of the supply system, the mass flow meter 33 metering experiment consumption CH 4 gas flow. So CH 4 The main function of the supply ...

example 1

[0043] Experimental simulation of liquid CO 2 Replacement of CH in hydrate 4 .

[0044] Sieve hundreds of grams of 20-40 mesh quartz sand with a standard sieve, wash and air dry for later use. It is determined that the porosity of the quartz sand is 46%, and the moisture content after natural air drying is 5%. When the moisture content is 30% of the weight of the quartz sand, the quartz sand is saturated. In this experiment, 290g of adaptive sand (14.5g of water in it) was taken, and 14g of 290ppm SDS aqueous solution was added thereto. The total water content of the quartz sand was 28.5g, and the saturation humidity was 32%.

[0045] Put the above-mentioned hydrated quartz sand into the hydrate reactor 33 (basically filled), vacuumize the system with the vacuum pump 11, and then open the CH 4 Supply system, use mass flow meter 30 to measure and feed 559mmolCH4 gas, at this time the gas CH in the hydrate reactor 4 The initial pressure of the hydrate reactor reaches 12-15MP...

example 2

[0049] Experimental simulation of gaseous CO 2 Replacement of CH in hydrate 4 .

[0050] CH in this experiment 4 The preparation method of hydrate is exactly the same as the method of liquid replacement, and will not be repeated here. in CH 4 After hydrate formation, in order to quantitatively understand the CH formed in quartz sand 4 For the amount of hydrate, adjust the refrigerator 10 to reduce the temperature of the reaction system to 271.2K 1 hour before the hydrate formation reaction has been completed and the subsequent replacement reaction starts. At this time, CH 4 Hydrate has a self-protection effect, and CO 2 Displace free CH 4 . CH formed at this time 4 CH in hydrate 4 The content is 242.7 mmol. To understand the gaseous CO 2 Replacement of CH in hydrate 4 Kinetic performance, the pressure in the reactor is determined to be 2.5MPa with the back pressure 16, and the temperature in the reactor is controlled to be 277.7±0.2K by the refrigerator 10. Due to...

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Abstract

The invention discloses an experiment simulation system for exploiting natural gas hydrate by using CO2. The system comprises a hydrate reactor, a CH4 gas source, a CH4 supply system, a CO2 supply system, a refrigerating system, a gas recovery system and a data acquisition system, wherein the CH4 gas source is connected with a reaction system and used for providing pressure stabilization for the preparation of the hydrate at the earlier stage; the CH4 supply system is used for recording the using amount of CH4; the CO2 supply system is connected with the hydrate reactor and used for providing a CO2 gas source for the exploitation of the hydrate at the later stage of an experiment; the refrigerating system is connected with the hydrate reactor and used for timely removing heat from the hydrate reactor or supplying heat to the hydrate reactor to keep the temperature condition in the hydrate reactor stable; the gas recovery system is connected with the hydrate reactor and used for recovering and storing mixed gas discharged from the outlet of the hydrate reactor and measuring the flow rate of the mixed gas; and the data acquisition system is connected with the CH4 supply system, the CO2 supply system, the hydrate reactor, the refrigerating system and the gas recovery system respectively and used for acquiring data from the systems. The process of exploiting the natural gas hydrate by displacing the CO2 can be comprehensively researched.

Description

technical field [0001] The present invention relates to a CO 2 A device for effectively exploiting natural gas hydrate belongs to the field of natural gas hydrate exploitation. Background technique [0002] Natural gas hydrate is a non-stoichiometric clathrate crystal compound formed by natural gas and water under certain conditions (appropriate temperature, pressure, gas saturation, water salinity, pH value, etc.). The main gas that forms natural gas hydrate is methane, and when the methane content exceeds 99.9% of the total gas, it can be called methane hydrate. 1m under standard condition 3 Hydrate can be stored for 150~180m 3 natural gas. Natural gas hydrate is mostly white or light gray in appearance, similar to ice and snow, and can burn in case of fire, so it is commonly called "combustible ice". [0003] The formation and distribution of natural gas hydrates are mainly controlled by the sources of hydrocarbon gases and the conditions of temperature and pressure....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B43/22
CPCY02P90/70
Inventor 梁德青查丽
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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