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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 the problems of reduced formation rigidity, improvement of replacement efficiency, geological collapse, etc., to achieve enhanced formation rigidity and reduced production The effect of improving water volume and safety

Inactive Publication Date: 2021-07-13
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Affected by many factors during the conventional carbon dioxide replacement mining process, the replacement efficiency needs to be improved
In addition, in the actual mining process, excessive water and sand production limit the development of hydrate mining, and the decomposition of hydrate will reduce the rigidity of the formation, which will cause geological disasters such as geological collapses and landslides
It can be seen that the technical problems of current mining, the cost of mining and the safety of the mining process have become the bottleneck restricting the exploitation of natural gas hydrate in various countries.

Method used

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Embodiment Construction

[0044] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described The embodiments are only some of the embodiments in this specification, not all of them. Based on one or more embodiments in this specification, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of the embodiments of this specification.

[0045]An embodiment of a natural gas hydrate production method provided in this specification uses such as figure 1 The shown device includes a gas cylinder 1, valves 2, 3, 4, 11, 19, a reactor 5, an acoustic-electric transducer 6, a sediment 7, a rotating handle 8, a bottom air inlet 9, and a thermocouple 10 , Air bath 12, temper...

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Abstract

The embodiment of the invention discloses a natural gas hydrate mining method. The method comprises the steps that free gas in a natural gas hydrate mineral deposit is mined in a pressure reduction mining mode till the pressure of the natural gas hydrate mineral deposit is reduced to the preset percentage above the equilibrium pressure corresponding to the temperature of the hydrate mineral deposit, and the value range of the preset percentage is 5% to 10%; the temperature of the hydrate mineral deposit is reduced and kept below the freezing point, and thus free water in the mineral deposit is frozen; after the pressure and the temperature of the mineral deposit are stable, natural gas hydrate is mined; after mining of the natural gas hydrate is finished, CO2 is injected into the mineral deposit; and when CO2 injection is stopped, the temperature of the mineral deposit is increased to the freezing point or above. By utilizing the natural gas hydrate mining method, energy needed by mining can be reduced, the natural gas hydrate is mined safely in an environment-friendly mode, the stratum stability can be enhanced, and geological disasters such as stratum collapse and seabed landslide which possibly occur in the conventional mining process are effectively avoided.

Description

technical field [0001] The embodiments of this description belong to the technical field of marine natural gas hydrate exploitation, and in particular relate to a method for exploiting natural gas hydrate. Background technique [0002] Natural gas hydrate is an ice-like, non-stoichiometric clathrate crystalline compound formed by hydrocarbon gases such as water and methane under high-pressure and low-temperature conditions. It has the characteristics of high density, high calorific value, wide distribution, and large reserves. Gas hydrates are widely distributed in the slopes of continental islands, uplifts of active and passive continental margins, polar shelf oceans, and deepwater environments. The total reserves of natural gas hydrate in the world are about twice the sum of the carbon content of all fossil fuels that have been proven so far. The natural gas hydrate reserves in the South my country Sea of ​​China are 64.97 billion cubic meters. Therefore, natural gas hydr...

Claims

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Application Information

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IPC IPC(8): E21B43/01E21B43/16E21B49/00
CPCE21B43/01E21B43/164E21B49/00
Inventor 孙长宇任亮亮陈光进王令颁祝一建杨兰英
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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