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Experimental device for replacement exploitation of CH4 hydrates with supercritical CO2 and use method

An experimental device and supercritical technology, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of large mass transfer resistance, low replacement rate, poor permeability, etc., to overcome large flow resistance and reduce The effect of mining cost and simple operation

Active Publication Date: 2020-03-31
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently CO 2 Replacement Mining CH 4 Hydrates are still in the stage of laboratory research, and most studies use gaseous CO 2 As a replacement medium, due to the gaseous CO 2 The mass transfer is greatly hindered and the permeability is poor, resulting in CH 4 The rate of replacement mining is slow and the replacement rate is low

Method used

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  • Experimental device for replacement exploitation of CH4 hydrates with supercritical CO2 and use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] This example provides a supercritical CO 2 Replacement Mining CH 4 The method of hydrate, its operation process is as follows:

[0057] After checking that the airtightness of the device is good, fill the kettle with a mixture of ice powder and quartz sand, open the first stop valve, and let methane gas flow in to 10.7 MPa, and then control the temperature of the reactor at 2°C. by CH 4 The pressure reducing valve maintains a constant pressure of 7 MPa to generate 2.7mol CH 4 Hydrate. Start supercritical CO 2 Generating system, CO 2 The circulation heating unit was set to 90 °C. Evacuate the CH in the gas phase in the reactor 4 After gas, turn on the CO 2 Advection pump, the supercritical CO in the piston kettle 2 Feed into the reactor at a constant speed. Each injection rate is 2.5-5 mL·min -1 , with an injection interval of 12 h, and injected 5 times. Inject supercritical CO 2 , the first temperature sensor displays a temperature of 75°C-83°C, and the sec...

Embodiment 2

[0059] This example provides a supercritical CO 2 Replacement Mining CH 4 The method of hydrate, its operation process is as follows:

[0060] After checking that the airtightness of the device is good, fill the kettle with a mixture of ice powder and quartz sand, open the first stop valve, and let methane gas flow to 11.1 MPa, and then control the temperature of the reactor to 2°C. by CH 4 The pressure reducing valve maintains a constant pressure of 7 MPa to generate 3.0mol CH 4 Hydrate. Start supercritical CO 2 Generating system, CO 2 The circulation heating unit was set to 90 °C. Evacuate the CH in the gas phase in the reactor 4 After gas, turn on the CO 2 Advection pump, the supercritical CO in the piston kettle 2 Feed into the reactor at a constant speed. Each injection rate is 2.5-5 mL·min -1 , with an injection interval of 12 h, and injected 4 times. Inject supercritical CO 2 , the first temperature sensor displays a temperature of 73°C-79°C, and the second...

Embodiment 3

[0062] This example provides a supercritical CO 2 Replacement Mining CH 4 The method of hydrate, its operation process is as follows:

[0063] After checking that the airtightness of the device is good, fill the kettle with a mixture of ice powder and quartz sand, open the first stop valve, and let methane gas flow in to 10.9 MPa, and then control the temperature of the reactor at 2°C. by CH 4 The pressure reducing valve maintains a constant pressure of 7 MPa to generate 2.8mol CH 4 Hydrate. Start supercritical CO 2 Generating system, CO 2 The circulation heating unit was set to 90 °C. Evacuate the CH in the gas phase in the reactor 4 After gas, turn on the CO 2 Advection pump, the supercritical CO in the piston kettle 2 Feed into the reactor at a constant speed. Each injection rate is 2.5-5 mL·min -1 , with an injection interval of 12 h, and injected 4 times. Inject supercritical CO 2 , the first temperature sensor displays a temperature of 71°C-77°C, and the sec...

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Abstract

The invention provides an experimental device for replacement exploitation of CH4 hydrates with supercritical CO2 and a use method. The experimental device comprises a CH4 hydrate generation system, asupercritical CO2 generation system, a reaction kettle main body device, a temperature control system, a data collection system, a gas sample analysis system and a mixed gas recovery system. The method comprises the steps that the high-temperature supercritical CO2 is generated in the supercritical CO2 generation system by a CO2 recycling heating device and is then injected into a reaction kettleused for generating the CH4 hydrates for exploitation and recovery of CH4; and a fluid which flows out from a discharge hole in the bottom of the reaction kettle is gasified by expansion in a sampling device and then gas phase chromatographic analysis of the fluid is conducted by a gas sample analysis system, compositions of the fluid are obtained, and a replacement recovery rate of CH4 is workedout. Through exploitation of the CH4 hydrates with the method, a replacement rate of methane is higher; experimental operations are simple; and CH4 and CO2 are separated, so economic efficiency and environment-friendly effects are high.

Description

technical field [0001] The invention relates to the field of exploitation of natural gas hydrate, in particular to supercritical CO 2 Replacement Mining CH 4 Hydrate experimental apparatus and methods. Background technique [0002] Natural gas hydrate is the most abundant unconventional energy on the earth. It is mainly buried in seabed sediments and land permafrost. According to the characteristics of high pressure, low temperature and low porosity and saturation of natural gas hydrate reservoirs, the common exploitation Methods include heat shock, depressurization, injection of inhibitors, CO 2 Replacement method and combined mining method between various methods. [0003] Among them, CO 2 Mining CH in displacement 4 At the same time, CO can be generated 2 Hydrate, thereby maintaining the stability of the sediment structure and the formation as a whole, thus realizing the triple function of natural gas exploitation, greenhouse gas sequestration and prevention of ge...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B43/01
CPCE21B43/164E21B43/01
Inventor 樊栓狮欧阳潜王燕鸿郎雪梅李刚王盛龙于驰
Owner SOUTH CHINA UNIV OF TECH