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Method for marine natural gas hydrate exploitation through water flow erosion method combined with heat injection

A mining method and natural gas technology, applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve problems such as low mining efficiency and application limitations, reduce mining costs, promote continuous decomposition, and improve reservoir permeability rate effect

Inactive Publication Date: 2018-05-29
DALIAN UNIV OF TECH
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Problems solved by technology

However, CO 2 The replacement method has low extraction efficiency and requires a stable carbon dioxide gas source, which limits its application

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  • Method for marine natural gas hydrate exploitation through water flow erosion method combined with heat injection

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Embodiment Construction

[0018] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0019] A method for exploiting marine natural gas hydrate by water flow erosion combined with heat injection, the steps are as follows:

[0020] (1) Select a suitable drilling location and use low-density mud drilling technology to drill two production wells to the inside of the gas hydrate reservoir, one as a marine water injection well and the other as a natural gas collection well;

[0021] (2) Start the water injection pump to inject ocean water into the ocean water injection well. Ocean water in the gas hydrate reservoir will start to flow from the wellbore to the surrounding reservoirs. Due to the temperature difference between the ocean water and the gas hydrate reservoir, the flow During the process, the heat of ocean water will be transferred to the surrounding hydrate reservoir through heat conduction and ...

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Abstract

The invention provides a method for marine natural gas hydrate exploitation through a water flow erosion method combined with heat injection, and belongs to the technical field of marine natural gas hydrate exploitation. Firstly, two development wells are drilled in a natural gas hydrate exploitation area to the interior of a natural gas hydrate reservoir, and a water injection pump is used for injecting marine water into the first development well for heating the reservoir, so that part of a natural gas hydrate is decomposed to generate CH4, a gap channel is opened, and the permeability around the development wells is increased; the pressure difference between the two development wells is controlled by controlling the natural gas collecting speed of a natural gas collection well; stable flow of the marine water in the reservoir is controlled through the pressure difference, and continuous step-by-step composition of the hydrate is promoted under the displacement function in the waterflowing process. The method is easy to implement, high in efficiency and low in cost, and can be used for large-scale industrial 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 marine natural gas hydrate exploitation method combined with heat injection water flow erosion method. Background technique [0002] Gas hydrates are solid crystalline substances formed by the interaction of natural gas and water under certain conditions. The main component of natural gas in natural gas hydrate is methane, so it is often called methane hydrate. According to the analysis of the formation conditions of gas hydrates, the reserves of gas hydrates on the earth are very abundant, and about 27% of the land and 90% of the seas contain gas hydrates. It is conservatively estimated that the organic carbon content in natural gas hydrate is twice that in fossil energy sources such as coal, oil, and natural gas. Due to the advantages of high energy density, clean combustion, abundant reserves and wide distribution, natural gas hy...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/01E21B43/20E21B43/24
CPCE21B41/0099E21B43/01E21B43/20E21B43/24
Inventor 宋永臣杨明军孙慧茹李洋辉赵佳飞刘瑜赵越超
Owner DALIAN UNIV OF TECH
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