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A simulation experiment device and working method of natural gas hydrate depressurization exploitation

A simulated experimental device and hydrate technology, which is applied in the fields of mining fluids, coal gasification, and earthwork drilling, can solve the problems of complex and changeable mining environment, lack of simulated borehole monitoring, and lack of simulated boreholes for hydrates, etc. Achieve the effect of saving equipment cost and meeting the experimental requirements

Active Publication Date: 2020-02-21
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, although some researchers have simulated the mining process of hydrates, due to the complex and changeable mining environment, there is a big discrepancy between the simulation experiment and the actual situation.
For example, the invention patent with the publication number CN104405345A discloses a permeable boundary layer natural gas hydrate mining simulation experiment device. Although the simulated production of hydrate can be completed, there is no simulated wellbore during the hydrate production, which is different from the actual production process. There is a large gap, and it is impossible to monitor the decomposition of hydrates and temperature changes during the mining process, and it is also impossible to monitor the sand production of hydrate mining
A master's thesis titled "Research on One-Dimensional Simulating Experimental Device for Natural Gas Hydrate" has studied the temperature change during the hydrate decomposition process, but this research also does not have the ability to simulate wellbore and sand production in hydrate production. In the test, only the pore pressure of the formation can be simulated, and other in-situ stress conditions are not considered. The actual hydrate production is carried out in the in-situ stress environment, and the stress state has great influence on the seepage of the fluid in the pores and the time of production. The sand production characteristics have a great influence

Method used

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  • A simulation experiment device and working method of natural gas hydrate depressurization exploitation
  • A simulation experiment device and working method of natural gas hydrate depressurization exploitation
  • A simulation experiment device and working method of natural gas hydrate depressurization exploitation

Examples

Experimental program
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Effect test

Embodiment 1

[0049] A natural gas hydrate decompression mining simulation experiment device, including a reactor 2, a confining pressure pump system connected to the reactor 2, a gas supply system, an exhaust system and a data acquisition system; To fix the upper indenter 31 and the lower indenter 32 of the experimental core 30, an oil separator 33 is arranged around the experimental core 30, and a simulated wellbore is arranged in the center of the experimental core 30.

[0050] The cross-sectional diameters of the upper indenter 31 and the lower indenter 32 are both 12.7 cm, which is the same as that of the experimental rock core 30 .

[0051] A through hole for simulating a wellbore is arranged axially in the upper indenter 31, and at least two L-shaped through holes are arranged in the upper indenter 31, and the horizontal section of the L-shaped through hole is connected to the The side wall of the upper indenter is penetrated, and the vertical section of the L-shaped through hole is ...

Embodiment 2

[0054] A natural gas hydrate depressurization recovery simulation experimental device as described in Example 1, the difference is that the experimental device also includes a simulated formation temperature device, which is used to provide simulated formation environment parameters for the reactor and all systems. The device for simulating formation temperature is cold storage 1. The reaction kettle 2 and all systems are arranged in the cold storage 1. The cold storage can realize temperature control from -20°C to room temperature, and all experimental equipment and experimental processes are carried out in the cold storage.

Embodiment 3

[0056] A natural gas hydrate depressurization mining simulation experiment device as described in Examples 1 and 2, the difference is that the confining pressure pump system includes a confining pressure pump 27 connected to the reaction kettle 2 through the seventh high-pressure pipeline 26 .

[0057] The gas supply system is connected to the methane gas source 4 connected to the reactor 2 through the fifth high-pressure pipeline 16, and the second shut-off valve 17, the second gas flow meter 18 and the decompression valve 17 are arranged on the fifth high-pressure pipeline 16. Valve 29.

[0058] The discharge system includes a second vent valve 25 connected to the reactor 2 through the sixth high-pressure pipeline 24, and a recovery air bag 3 connected to the reactor 2 through the first high-pressure pipeline 5: in the first high-pressure pipeline 5 is provided with a vacuum valve 6; the first high-pressure pipeline 5 is also connected to the recovery air bag 3 through a fo...

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Abstract

A natural gas hydrate depressurization exploration simulation experiment device comprises a reaction still, a confining pressure pump system connected with the reaction still, a gas supply system, an exhausting system and a data collecting system, wherein an upper press head and a lower press head used for fixing an experiment rock core are arranged in the reaction still, and an oil separation sleeve is arranged around the experiment rock core, so that a well shaft is formed. The natural gas hydrate depressurization exploration simulation experiment device realizes indoor simulation of natural gas hydrate depressurization exploration, can correctly reflect the decomposing condition and shakeout condition during the hydrate exploration process, and has guide significance in exploration of the hydrate resource.

Description

technical field [0001] The invention relates to a natural gas hydrate depressurization mining simulation experiment device and a working method, belonging to the technical field of natural gas hydrate development. Background technique [0002] Natural gas hydrate is a crystalline compound formed by the combination of natural gas and water molecules. It has the advantages of large resources, high energy density and low pollution. It is recognized as an important follow-up clean energy with good prospects and realizes the development of natural gas hydrate resources. Utilization is of great significance to promote the development of my country's energy industry, improve the energy consumption structure, ensure the safe supply of energy, promote the construction of ecological civilization, and maintain sustainable economic and social development. Gas hydrate is a metastable mineral composed of natural gas and water, which can only exist under certain temperature and pressure con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16E21B43/01E21B43/295
CPCE21B41/0099E21B43/01E21B43/16E21B43/295
Inventor 闫传梁田万顷陈凯文程远方丁吉平滕飞李庆超张怀文
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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