Experimental simulation device and method for exploiting natural gas hydrate

A technology of experimental simulation and hydrate, which is applied in the direction of mining fluid, gas fuel, earth drilling, etc., can solve the problems of low replacement efficiency, slow replacement rate, hydrate decomposition, etc., and achieve low cost, prevention of decomposition, and easy operation Effect

Active Publication Date: 2014-10-08
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] for CO 2 Li Xiaosen et al. published the patent "A Simulating Method and Experimental Device for Carbon Dioxide Replacement Exploitation of Natural Gas Hydrate". However, after the hydrate is formed in the method of this invention, the method of discharging excess gas is to reduce the temperature. In the temperature range of hydrate self-protection effect, some hydrates will still decompose
And this invention still can not solve CO 2 Disadvantages such as low replacement efficiency and slow replacement rate for natural gas hydrate replacement

Method used

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  • Experimental simulation device and method for exploiting natural gas hydrate
  • Experimental simulation device and method for exploiting natural gas hydrate

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Experimental program
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Effect test

Embodiment 1

[0038] like figure 1 As shown in the figure, an experimental simulation device for exploiting natural gas hydrate includes a regulated gas supply and liquid supply module, a reactor 8, a control module, a data measurement module, and a data acquisition and processing module, wherein:

[0039] The reactor 8 includes a kettle body 48, a piston 37 that is sealingly matched with the inner wall of the kettle body 48 and can move up and down, a kettle cover 47 connected to the top of the kettle body 48, and a bracket 12 that supports the bottom of the kettle body 48. The kettle cover 47 is provided with a pressure detection interface 44, a gas inlet and outlet 45, and a temperature detection interface 46 that can be connected to the inner cavity of the kettle body 48. The inner cavity of the kettle body 48 is provided with a microporous filter 35 at one end close to the kettle cover 47. , to achieve uniform distribution of pressure, a temperature sensor 38 and a one-way valve 36 a...

Embodiment 2

[0047] A method for exploiting natural gas hydrate, comprising the steps of:

[0048] (1) generate hydrate: place the piston 37 at the bottom of the reactor 8, add a certain amount of sodium dodecyl sulfate solution in the reactor 8, vacuumize, open the fourth valve 21, the seventh valve 30, go to Reactor 8 is filled with CH 4 To the pressure of 4MPa, adjust the temperature of the constant temperature tank 4, under the conditions of the temperature of 1°C and the pressure of 4MPa, the reaction time is 100h to generate hydrate;

[0049] (2)CO 2 Reserve: When hydrate is formed, close the first valve 7, put the CO 2 The gas is charged into the buffer tank 5, the volume of the buffer tank 5 is 100ml, and the mass flow meter 3 is used to measure the CO entering the buffer tank 5 2 amount;

[0050] (3) Isobaric exhaust: after the hydrate is formed, open the second valve 13 and the third valve 16, and inject the prepared brine with a certain mass fraction into the bottom of the r...

Embodiment 3

[0059] A method of producing natural gas hydrates, comprising the steps of:

[0060] (1) Generate hydrate: place the piston 37 at the bottom of the reactor 8, add a certain amount of sodium lauryl sulfate solution into the reactor 8, vacuumize, open the fourth valve 21, the seventh valve 30, and Reactor 8 is filled with CH 4 To a pressure of 8MPa, adjust the temperature of the constant temperature tank 4, under the conditions of a temperature of 6°C and a pressure of 8MPa, the reaction time is 50h to form a hydrate;

[0061] (2) CO 2 Reserve: when generating hydrate, close the first valve 7, 2 The gas is charged into the buffer tank 5, and the volume of the buffer tank 5 is 500ml, and the CO entering the buffer tank 5 is measured with a mass flow meter 3 2 amount;

[0062] (3) Isobaric exhaust: After the hydrate is formed, open the second valve 13 and the third valve 16, and use the hand pump 17 to inject a certain mass fraction of brine into the bottom of the reactor 8 fr...

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Abstract

The invention discloses an experimental simulation device and a method for exploiting natural gas hydrate. The experimental simulation device comprises a stable pressure gas/liquid supply module, a reactor, a control module, a data measuring module and a data acquisition and processing module. The method comprises the following steps: discharging unreacted gases in an isobaric manner after the hydrate is generated, subsequently compressing the hydrate into a dense hydrate piece, introducing a CO2 gas from one side of the hydrate piece, reducing the pressure on the other side of the hydrate piece, and thus achieving combination of two natural gas hydrate exploitation methods of CO2 exchange and pressure reduction. The experimental simulation device overcomes the defects that the efficiency is low and the speed is low in natural gas hydrate exploitation in the CO2 exchange mode, overcomes the difficulty that geological disaster can be caused in natural gas hydrate exploitation in the pressure reduction mode, improves the efficacy in natural gas hydrate exploitation, and moreover is simple in structure and low in cost.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate exploitation, in particular to an experimental simulation device and method for exploiting natural gas hydrate. Background technique [0002] Natural gas hydrate is a kind of non-stoichiometric cage crystal hydrate, which is formed by natural gas and water under certain temperature conditions. Gas hydrates widely exist in deep seabed and permafrost areas. It is estimated that the amount of gas hydrates contained in the shallow part of the lithosphere with a global depth of less than 2000m is equivalent to twice the sum of the proven conventional fossil fuels. Therefore, the exploitation of natural gas hydrate has also attracted more and more attention. The traditional methods for exploiting natural gas hydrate mainly include pressure reduction method, heat shock method, chemical reagent method and the combination of the above methods. All of these methods destroy the equilibrium cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16C10L3/08
Inventor 樊栓狮闫素贞温永刚郎雪梅王燕鸿
Owner SOUTH CHINA UNIV OF TECH
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