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A kind of water flow erosion method of marine natural gas hydrate mining method

A mining method and hydrate technology, applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve problems such as low efficiency of carbon dioxide displacement mining, environmental problems, and long mining time

Active Publication Date: 2020-04-24
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
Carbon dioxide displacement mining is inefficient and cannot realize the complete and efficient extraction of natural gas hydrates. The extraction takes a long time and there is a risk of leakage

Method used

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  • A kind of water flow erosion method of marine natural gas hydrate mining method

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Embodiment

[0017] The method for exploiting marine natural gas hydrate by water erosion method of the present invention adopts low-density mud drilling technology to drill a series of natural gas hydrate exploitation channels in the natural gas hydrate area, and use these exploitation channels to conduct water erosion exploitation of natural gas hydrate. Taking one group of mining channels as an example for illustration, a group of mining channels includes three channels: the pressure control and gas outlet channel in the middle, and the pressure control channels on both sides.

[0018] As shown in the figure, select three suitable drilling positions in the middle of the reservoir, use low-density mud drilling technology to drill three production channels in the natural gas hydrate occurrence area, and drill between the adjacent production channels in the hydrate reservoir. A number of horizontal water storage channels are drilled in between to store and withdraw an appropriate amount of ...

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Abstract

The invention belongs to the technical field of marine natural gas hydrate exploitation, and relates to a method for exploiting marine natural gas hydrate by a water flow erosion method. The present invention further controls the flow of ocean water inside the reservoir by controlling the pressure gradient between the production well and its surrounding reservoirs. Based on the characteristics of high permeability around the production well, the gradual, stable and efficient decomposition of hydrates is realized, and the hydrates are guaranteed. The complete exploitation uses the displacement effect of the water flow process to realize the efficient collection of natural gas. The stable and efficient mining process ensures the stability of the reservoir at the same time, and eliminates the major natural disasters caused by the damage of the reservoir structure and geological damage caused by the large pressure drop. The invention is easy to realize and is beneficial to realizing large-scale commercial exploitation of hydrates.

Description

technical field [0001] The invention belongs to the technical field of marine natural gas hydrate exploitation, and in particular relates to a method for exploiting marine natural gas hydrate by water flow erosion. 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 high efficiency, high energy accumulation, large reserves, and environmental friendliness. It has broad development prospects and has attracted worldwide attention. At present, the mining technologies of natural gas hydrate mainly include depressurization mining method, heat shock mining method, chemical reagent injection mining method, and carbon dioxide displacement mining method. [0003] The depressurization production method has special requirements on the properties of ga...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/01E21B43/20
CPCE21B43/01E21B43/20E21B41/0099
Inventor 宋永臣陈兵兵杨明军王大勇张毅刘瑜赵越超
Owner DALIAN UNIV OF TECH
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