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A device and method for natural gas hydrate exploitation based on heat pipe technology

A mining method and technology for natural gas, which are applied in the fields of mining fluids, coal gasification, and earth-moving drilling, etc., can solve the problems of uncontrollable heat transfer direction and less heating area of ​​natural gas hydrate, and achieve the effect of improving utilization efficiency and expanding heating area.

Active Publication Date: 2020-11-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of less heating area and uncontrollable heat transfer direction in the exploitation of natural gas hydrate by traditional heat injection method, the present invention proposes a device and method for exploitation of natural gas hydrate based on heat pipe technology

Method used

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  • A device and method for natural gas hydrate exploitation based on heat pipe technology
  • A device and method for natural gas hydrate exploitation based on heat pipe technology

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, a natural gas hydrate production device based on heat pipe technology includes several production wells and production wells extending to the natural gas hydrate reservoir 5, and each production well includes a vertical section 4 of the production well and a gas hydrate production well located in the natural gas hydrate reservoir 5. The horizontal section 7 of the production well, the production well includes a vertical section 11 of the production well and a horizontal section 9 of the production well located in the natural gas hydrate reservoir 5, and the wellhead 12 of the production well located in the vertical section 11 of the production well is connected and arranged There is a gas-liquid separator 13, and a number of heat pipes 8 extending into the natural gas hydrate reservoir 5 are evenly arranged radially on the well wall of the horizontal section 7 of the production well. The heat pipes 8 are flexible heat pipes or telescopic heat p...

Embodiment 2

[0035] A natural gas hydrate extraction method based on the extraction device, comprising the steps of:

[0036] S1. In the initial stage, the depressurization method is used for mining. The hydrate in the natural gas hydrate reservoir 5 is decompressed and decomposed to produce natural gas. The natural gas with liquid components flows to the horizontal section 9 of the production well, and then is transported through the vertical section 11 of the production well. To gas-liquid separator 13, thereby obtain required product methane gas;

[0037] S2. When the pressure of the natural gas hydrate reservoir 5 drops below 15% of the equilibrium pressure of the hydrate phase corresponding to the reservoir temperature, inject thermal fluid at 80°C to 120°C through the wellhead 1 of the production well, such as hot water, hot brine, Hot steam or hot ethylene glycol, after the hot fluid flows through the vertical section 4 of the production well to the horizontal section 7 of the produ...

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Abstract

The invention discloses a heat pipe technique based natural gas hydrate exploitation device, which comprises a plurality of exploitation wells and production wells. The exploitation wells and the production wells extend to a natural gas hydrate reservoir stratum, each exploitation well comprises an exploitation well vertical section and an exploitation well horizontal section in the natural gas hydrate reservoir stratum, and each production well comprises a production well vertical section and a production well horizontal section in the natural gas hydrate reservoir stratum. A gas-liquid separator is connectedly arranged at a production well opening at each production well vertical section, and a plurality of heat pipes extending into the natural gas hydrate reservoir stratum are radiallyand uniformly arranged on the wall of each exploitation well horizontal section. The invention further discloses a heat pipe technique based natural gas hydrate exploitation method. By the heat pipes,heat of hot water in each exploitation well is transferred to the natural gas hydrate reservoir stratum, most of heat is used for damaging hydrate phase equilibrium instead of heating porous gas liquid and sediments, and accordingly loss of heat in the reservoir stratum is reduced, heat transferring is effectively enhanced, and the method and the device can be used for large-scale exploitation ofnatural gas hydrate.

Description

technical field [0001] The invention relates to the field of natural gas hydrate exploitation, in particular to a natural gas hydrate exploitation device and method based on heat pipe technology. Background technique [0002] Gas hydrates are formed from natural gas (CH 4 majority, with a small amount of C 2 h 6 、C 3 h 8 and C 4 h 10 ) and water under conditions of lower temperature and higher pressure to form a cage solid compound. [0003] Gas hydrates are mainly distributed in permafrost or seabed sediments with a water depth of more than 300 meters, and are one of the most abundant non-traditional energy resources on earth. [0004] At present, natural gas hydrate production methods mainly include heat injection method, depressurization method, chemical reagent injection method and CO 2 Replacement method or a combination of the above two methods. These methods break the thermodynamic stability of natural gas hydrate under the original conditions to achieve the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B43/295E21B43/30E21B43/01
CPCE21B41/0099E21B43/24E21B43/295E21B43/305
Inventor 樊栓狮陈建标郎雪梅王燕鸿李刚
Owner SOUTH CHINA UNIV OF TECH