A method and device for mining natural gas hydrate by in-situ combustion method

An in-situ combustion, natural gas technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of slow action of natural gas hydrate layers, environmental problems, and expensive chemical reagents.

Active Publication Date: 2017-12-26
DALIAN UNIV OF TECH
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Problems solved by technology

The chemical reagents required for the chemical reagent injection mining method are expensive, have a slow effect on the natural gas hydrate layer, and also bring some environmental problems, so there are relatively few researches on this method at present

Method used

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  • A method and device for mining natural gas hydrate by in-situ combustion method
  • A method and device for mining natural gas hydrate by in-situ combustion method

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Embodiment Construction

[0016] The present invention will be described in further detail below in conjunction with the technical scheme and accompanying drawings.

[0017] figure 2 Shown is a system diagram of an in-situ combustion gas hydrate production method and device: a horizontal oxygen injection well is drilled in the upper part of the reservoir, and two decompression ports are selected, and low-density mud drilling is used to drill the gas hydrate reservoir. Reduce the pressure to decompose part of the natural gas hydrate. By injecting oxygen into the natural gas reservoir and igniting it, a small amount of methane is used to burn heat to promote the decomposition of a large amount of reservoir hydrate.

[0018] figure 1 Shown is a schematic diagram of the structure of an oxygen injection well and combined casing for an in-situ combustion natural gas hydrate recovery technology: the oxygen recovery box is connected to the oxygen injection device and the L-shaped inner casing through pipelin...

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Abstract

The invention belongs to the technical field of marine natural gas hydrate exploitation, and provides a method and device for in-situ combustion natural gas hydrate exploitation. The device includes oxygen injection system, detection and feedback system, oxygen recovery and recycling system and natural gas collection system. Aiming at the shortcomings of the current natural gas hydrate mining technology, the invention provides a natural gas hydrate mining method and device by an in-situ combustion method in combination with a depressurization method and a thermal shock method. In this method, part of the natural gas hydrate is decomposed into CH4 by reducing the pressure first, injecting oxygen through a special combined pipeline for multi-point ignition, and using the heat released by combustion to promote the decomposition of the natural gas hydrate. The method is easy to realize, has a large heating range and high efficiency, and can be used for industrialized large-scale exploitation of natural gas hydrate.

Description

technical field [0001] The invention belongs to the technical field of marine natural gas hydrate exploitation, and in particular relates to a method and device for in-situ combustion natural gas hydrate exploitation. Background technique [0002] Under the condition that traditional fossil fuels are increasingly scarce, the development and utilization of new energy has become the key research content of countries all over the world. As a new energy source, natural gas hydrate has the characteristics of new type, high efficiency, large reserves, etc., and has broad development prospects, and has received worldwide attention. At present, the mining technologies of natural gas hydrate mainly include depressurization mining method, thermal shock mining method and chemical reagent injection mining method. [0003] The decompression production method has special requirements on the properties of gas hydrate reservoirs. Only when the gas hydrate is located near the temperature-pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/243E21B43/01E21B49/08E21B47/07
CPCE21B43/01E21B43/243E21B49/08E21B41/0099E21B47/07E21B49/0875
Inventor 宋永臣杨明军陈兵兵刘卫国李洋辉王朋飞
Owner DALIAN UNIV OF TECH
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