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Method for utilizing electromagnetic heating mode to exploit natural gas hydrate

A heating method and natural gas technology, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of affecting production efficiency, large heat loss in thermal excitation production, low production efficiency, etc., so as to improve gas production efficiency. , improve efficiency, increase the effect of economic benefits

Active Publication Date: 2018-09-18
JILIN UNIV
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Problems solved by technology

[0007] Aiming at the problems of large heat loss and low production efficiency in thermal excitation mining of deep-sea natural gas hydrate reservoirs, and the problem that the formation of secondary hydrates on the well wall during depressurization production affects the production efficiency, the purpose of the present invention is to provide a method of using electromagnetic heating to mine natural gas hydrate. The method is suitable for the thermal stimulation production method of marine natural gas hydrate reservoirs, and the method used in combination with depressurization production to avoid the formation of secondary hydrates on the well wall

Method used

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  • Method for utilizing electromagnetic heating mode to exploit natural gas hydrate

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Effect test

Embodiment 1

[0022] The drilling fluid is mixed with fine iron powder, and the drilling fluid containing iron powder is injected into the natural gas hydrate reservoir by means of a high-pressure jet system; the electromagnetic heating system adopts the principle of high-frequency electric heating to convert alternating current into a frequency of The high-frequency current of 20KHZ~40KHZ generates a high-frequency magnetic field with a frequency of 20KHz~50GHz. When the magnetic field lines in the magnetic field act on the iron powder in the natural gas hydrate reservoir through the insulated natural gas hydrate reservoir, the magnetic field lines are cut and generate a large amount of The small eddy current makes the iron powder itself heat up rapidly, heats the natural gas hydrate reservoir from the inside, realizes thermal excitation and causes the natural gas hydrate to decompose; the generated methane gas is stored under pressure by the gas recovery system. The method is jointly reali...

Embodiment 2

[0028] The main technical solutions of this embodiment are the same as those of Embodiment 1, and the features not explained in this embodiment are explained in Embodiment 1, and will not be repeated here. The difference between this embodiment and Embodiment 1 is that horizontal wells or inclined wells are used inside the natural gas hydrate reservoir to increase the scope of the production area and improve the production efficiency.

Embodiment 3

[0030]The main technical solutions of this embodiment are the same as those of Embodiment 1, and the features not explained in this embodiment are explained in Embodiment 1, and will not be repeated here. The difference between this embodiment and Embodiment 1 is that a plurality of production wells are adopted, arranged in a circular array around the middle production well, and the electromagnetic generator 7 is placed at the bottom of the middle production well, and can be heated toward each production well; Equipment and engineering investment, thereby reducing costs.

[0031] The present invention sprays iron powder into the natural gas hydrate reservoir, mixes it with the sediment in the natural gas hydrate reservoir, and then heats the iron powder through the electromagnetic generator 7, and then heats the natural gas hydrate reservoir, which can be more efficient Faster and more uniform heating of natural gas hydrate reservoirs with high heat transfer efficiency.

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Abstract

The invention discloses a method for utilizing an electromagnetic heating mode to exploit natural gas hydrate and belongs to the technical field of natural gas hydrate exploiting. The method comprisesthe steps that iron powder is mixed in drilling fluid, and the drilling fluid with the iron powder is injected in a natural gas hydrate reservoir in a mode of jet flow; alternating currents are converted to high-frequency currents by a high frequency electrical heating principle, and a high frequency magnetic field is formed; and when a magnetic force line in the magnetic field acts on the iron powder by the insulative natural gas hydrate reservoir, the magnetic force line is cut, eddy is produced and the iron powder is heated, so that the aim of heating the natural gas hydrate reservoir is achieved and thermal activation exploiting of the natural gas hydrate reservoir is achieved. The method has high applicability, the thermal activation exploiting of the natural gas hydrate reservoir isindividually carried out according to the practical need of projects; or the method and a voltage drop method are used together, the phenomenon that secondary hydrate is formed around the well wall of an exploiting well during depressurizing production is prevented, and the efficiency of the depressurizing production is improved. The optimization exploiting of natural gas hydrate storing can be achieved, gas production efficiency is improved and the economic benefit is increased.

Description

technical field [0001] The invention belongs to the technical field of natural gas hydrate exploitation, and in particular relates to a method for exploiting natural gas hydrate by means of electromagnetic heating, which is suitable for suppressing secondary hydrate formation in deep-sea natural gas hydrate thermal excitation exploitation and depressurization exploitation. Background technique [0002] Natural gas hydrate is considered to be the most potential new clean energy to replace coal, oil and natural gas in the 21st century. All countries in the world, especially developed countries and countries with energy shortages, attach great importance to the exploration and development of natural gas hydrate. my country has a vast sea area and has good prospects for gas hydrate mineralization. At present, hydrate mining technologies mainly include depressurization method, thermal stimulation method and chemical inhibitor method. [0003] The depressurization method destroys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/01E21B43/24
CPCE21B41/0099E21B43/01E21B43/2401
Inventor 李冰孙友宏王元贾瑞郭威王秋雯曲莉莉
Owner JILIN UNIV