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Natural gas hydrate exploitation method and device adopting in-situ combustion method

A mining method and in-situ combustion technology, which can be used in the fields of production fluids, earth-moving drilling, wellbore/well components, etc., and can solve problems such as environmental problems, high cost of chemical reagents, slow action of natural gas hydrate layers, etc.

Active Publication Date: 2016-05-04
DALIAN UNIV OF TECH
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  • Application Information

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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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  • Natural gas hydrate exploitation method and device adopting in-situ combustion method
  • Natural gas hydrate exploitation method and device adopting 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 ocean natural gas hydrate exploitation and provides a natural gas hydrate exploitation method and device adopting an in-situ combustion method. The device comprises an oxygen injection system, a detection and feedback system, an oxygen recovery and recycling system and a natural gas collecting system. The natural gas hydrate exploitation method and device adopting the in-situ combustion method aims at overcoming the shortcomings of an existing natural gas hydrate exploitation technology and is provided by combining with a voltage drop method and a heat shock method. The method comprises the steps of firstly performing voltage drop to enable a part of natural gas hydrate to be firstly decomposed into CH4, injecting oxygen through a specially-make combined pipeline to perform multi-point ignition, utilizing heat released during burning to promote decomposition of the natural gas hydrate. The method is easy to achieve, large in heating range and higher in efficiency and can be used for industrialized large-scale exploitation of the 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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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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