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Reservoir stability safety assessment method during depressurization exploitation of deep sea hydrate

A safety assessment and hydrate technology, applied in data processing applications, instruments, calculations, etc., can solve problems such as soil deformation, submarine landslide geological disasters, and collapses

Pending Publication Date: 2022-05-27
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Failure to conduct an accurate assessment before mining may cause soil deformation or even collapse, leading to geological disasters such as submarine landslides

Method used

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  • Reservoir stability safety assessment method during depressurization exploitation of deep sea hydrate
  • Reservoir stability safety assessment method during depressurization exploitation of deep sea hydrate
  • Reservoir stability safety assessment method during depressurization exploitation of deep sea hydrate

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Embodiment Construction

[0024] The purpose of the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be repeated here, but the embodiments of the present invention are not limited to the following embodiments.

[0025] In this embodiment, the decomposition of hydrates can be determined according to different degrees of depressurization and different depressurization times. After the decomposition of hydrates, the failure stress and deformation of the hydrate sediment reservoirs are calculated. The mechanical properties of the soil after the complete decomposition of the hydrate, the limit of the plastic failure of the soil settlement and deformation is calculated, and the critical point of the soil instability under different decomposition times is obtained.

[0026] Introduction of reservoir properties: The hydrate reservoir is located below 1140m below sea level, the seawater depth is 1000m, the thi...

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Abstract

The invention discloses a reservoir stability safety assessment method during deep sea hydrate depressurization exploitation, which comprises the following steps: drilling in a deep sea natural gas hydrate reservoir in a step-by-step depressurization mode, setting the actual depressurization condition according to the pressure and phase equilibrium condition of the natural gas hydrate reservoir, and determining the actual distributed depressurization condition according to the actual condition of the hydrate reservoir. Meanwhile, the staged pressure reduction intensity of each step is the same as the pressure reduction mining time for maintaining pressure reduction, and in the pressure reduction process, attention is paid to the soil body settlement deformation condition of the hydrate reservoir. According to the method, the situation that the seabed structure is damaged due to plastic failure of the soil body caused by too fast pressure drop is avoided.

Description

technical field [0001] The invention relates to the technical field of natural gas development, in particular to a method for safety evaluation of reservoir stability during depressurization and exploitation of deep water hydrates. Background technique [0002] At present, the consumption of conventional energy reserves in the world is huge, and the reserves and composition of hydrates show that hydrates are fossil energy that can replace conventional energy in the 21st century. Therefore, many countries and regions have carried out exploration and development research on hydrates. In 2013, Japan realized the first trial production of offshore hydrates in the world. Obvious sand production occurred and accompanied by a sudden increase in water production. The trial production was abandoned because it could not handle this situation. In 2017, my country has continuously tested mining in the South China Sea for 60 days, representing the highest level of test mining technology ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/02
CPCG06Q10/0635G06Q50/02
Inventor 杨乐乐王晶樊天慧陈超核罗炼陈瑶瑶
Owner SOUTH CHINA UNIV OF TECH