Method and device for exploiting sea natural gas hydrate

A technology for natural gas and hydrate, which is applied in the fields of mining minerals, mining fluids, and earth-moving drilling, etc. It can solve the problems of slow reaction speed and low replacement efficiency, and achieve the effect of large-scale development.

Active Publication Date: 2012-02-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, relevant tests have shown that the reaction speed of this method is too slow, and the migration of carbon dioxide in the deposit will be blocked by the formation and gas hydrate, and the replacement efficiency is very low

Method used

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  • Method and device for exploiting sea natural gas hydrate
  • Method and device for exploiting sea natural gas hydrate
  • Method and device for exploiting sea natural gas hydrate

Examples

Experimental program
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Embodiment Construction

[0042]The device for exploiting marine natural gas hydrate according to the present invention consists of a reinforcement well 5, an observation well 6, a cluster collection well 7, an injection well 8, a deep-sea natural gas gathering and transportation pipeline 9, a seabed safety monitoring platform 10, and floating natural gas hydrate exploitation. Platform 11, fixed natural gas hydrate exploitation platform 12, and offshore natural gas gathering and transportation pipeline 13; reinforcement well 5 and observation well 6 are located at the bottom of the ocean. The shear joint 502 is connected with a sufficient amount of curing agent 506 inside, the pocket section 503 is located at the natural gas hydrate reservoir 4, the shear joint is located at the loose formation structure, the reinforcement well 6 is connected to the input pipe 504, and the input pipe 504 is connected to the The submarine safety monitoring platform 10 is connected, and the observation well 6 is distribut...

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Abstract

The invention relates to a method and a device for exploiting sea natural gas hydrate. The method is characterized in that: a safety well group and an exploiting well group are built in a natural gas hydrate burial area, and the stability of the seabed strata is monitored through the safety well group; natural gas is exploited through the exploiting well group and is transported to a land terminal through a seabed gathering system; and the exploitation means comprises injecting a solvent in the natural gas hydrate reservoir to dissolve the natural gas hydrate, and then collecting the solution and carrying out gas-water separation to obtain the natural gas. According to the method and the device disclosed herein, the safe exploitation of the natural gas hydrate in sea wide area can be realized, the stability of the seabed in the exploitation process is guaranteed, and the dissipation of the natural gas is reduced. The invention is suitable for large scale industrial exploitation of the sea natural gas hydrate.

Description

technical field [0001] The invention relates to a method and device for exploiting marine natural gas hydrate, belonging to the field of marine oil and gas reservoir development. Background technique [0002] Natural gas hydrate is an ice-like solid substance composed of water and gas molecules under low temperature and high pressure conditions, and its properties vary with the nature of reservoirs and gas sources. The mining methods of seabed natural gas hydrate are significantly different from those of existing gas reservoirs. The common mining methods in the literature are thermal injection decomposition method, depressurization decomposition method, inhibitor injection decomposition method and displacement decomposition method, etc. The decompression decomposition method is to decompose by reducing the surface pressure of the gas hydrate so that it is outside the phase equilibrium region. The biggest problem faced by this method is that the decomposition rate is too slo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C50/00E21B43/00
CPCE21B41/0099
Inventor 马汝涛纪友哲李青松
Owner PETROCHINA CO LTD
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