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A kind of natural gas hydrate exploitation method and system

A technology for hydrate and natural gas, applied in the fields of fluid extraction, earth-moving drilling, climate sustainability, etc., can solve the problems of short operating life, large energy consumption of electric submersible pumps, and high production cost, and achieve low cost and reduced gas production. The effect of energy consumption, process and equipment simplification

Active Publication Date: 2020-12-01
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods of gas production and transmission using subsea electric submersible pumps have large energy consumption, short operating life, and high mining costs.

Method used

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  • A kind of natural gas hydrate exploitation method and system
  • A kind of natural gas hydrate exploitation method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] like figure 1 As shown, at the place where the marine gas hydrate reservoir is located, the sea surface platform 9 is erected using the existing technology, and the vertical production well 13 is drilled above the seabed rock layer. The sand device 14 is connected to the wellhead device 12 at the top of the production well; the ocean riser 10 is installed at the same time, and the bottom of the ocean riser 10 is connected to the wellhead device 12 through a deep-sea automatic control gate valve 205, and the top of the ocean riser 10 is connected to the gas on the sea surface platform 9 through a pipeline. The liquid separator 8, the gas storage tank 7, and the compressor 6 are connected in sequence; the seabed gas storage tank 1, the seabed gas-liquid cyclone separator 11, the gas buffer tank 4 and the booster pump 3 are installed next to the seabed production well, and the seabed gas The gas-liquid mixture inlet of the liquid cyclone separator 11 is connected to the we...

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Abstract

The invention discloses a gas recovery method for natural gas hydrate exploitation. The gas-water mixture at the bottom of a mining well is transported to a sea surface platform through a marine standpipe by using the gas lift effect of methane gas released by the decomposition of natural gas hydrate to realize marine natural gas hydration. Controllable self-spraying production of natural gas; in the start-up stage of production, the bottom hole pressure is reduced by the gas lift of the externally injected gas to decompose the hydrate; Mining, and adjust the self-injection speed and supplement gas consumption through the subsea gas storage tank; the gas extraction process and equipment are simple, easy to operate, low energy consumption, no need for subsea dynamic equipment, easy to realize industrialization and automatic production, and can effectively avoid the occurrence of gas in the ocean riser. Risk of clogging due to secondary hydrate formation, wide range of applications.

Description

technical field [0001] The invention belongs to the field of energy technology, and relates to a method for exploiting marine natural gas hydrates, in particular to a system and a control method for exploiting marine natural gas hydrates, producing gas, and transporting them. Background technique [0002] Natural Gas Hydrate (Natural Gas Hydrate, referred to as Gas Hydrate) is a non-stoichiometric, ice-like, cage-type crystalline compound formed by low-molecular-weight hydrocarbons in water and natural gas under low temperature and high pressure conditions. Natural gas hydrates are mainly methane hydrates, most of which occur in the seabed, which have the advantages of large reserves, wide distribution, shallow burial, high energy density, and no pollution and residue after combustion. The decomposition of methane hydrate per unit volume can produce 150-180 standard volumes of methane gas. It is estimated that the organic carbon stored in the form of natural gas hydrate on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/01E21B43/12E21B43/16E21B43/36E21B43/34
CPCE21B43/01E21B43/122E21B43/168E21B43/34E21B43/36E21B41/0099Y02P90/70
Inventor 陈朝阳李小森张晋铭张郁李刚吕秋楠王屹颜克凤
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI