Safe mining method for natural gas hydrate

A technology for hydrate and natural gas, used in the production of fluids, earth-moving drilling, wellbore/well components, etc.

A technology for hydrate and natural gas, used in the production of fluids, earth-moving drilling, wellbore/well components, etc.

CN112796713AActive Publication Date: 2021-05-14CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Safe mining method for natural gas hydrate
  • Safe mining method for natural gas hydrate
  • Safe mining method for natural gas hydrate

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Effect test

Embodiment 1

[0031] Embodiment 1, as shown in 1-4, a safe mining method of natural gas hydrate mentioned in the present invention is carried out according to the following steps:

[0032] (1) Geological survey of pre-development block 2;

[0033] (2) Well location deployment in pre-development blocks;

[0034] (3) Optimizing wellbore trajectory;

[0035] (4) Drill the first batch of wells 4-1, 4-3, and 4-5 at intervals according to the well location deployment, carry out reservoir transformation in the development block, and use the depressurization method for production;

[0036] (5) After the production is finished, fill the hole 9 at the bottom of the well;

[0037] (6) Drill the second batch of wells 4-2 and 4-4 at the inter-well positions of the first batch of wells according to the well location deployment, carry out reservoir transformation in the development block, and use the depressurization method for production;

[0038] (7) Stop production when natural gas production decrea...

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Abstract

The invention discloses a safe mining method for natural gas hydrate. According to the technical scheme, the safe mining method for the natural gas hydrate comprises the following steps that geological survey is conducted on a pre-development block; a pre-development block well position is deployed; well track optimization is carried out; a first batch of wells are drilled at intervals and depressurization production is performed; the wells are abandoned after production, and cement is injected into the bottoms of the wells to fill cavities; a second batch of wells are drilled between the first batch of wells and depressurization mining is performed; and production is finished. According to geological characteristics of a seabed slope and distribution characteristics of a natural gas hydrate reservoir, the plastic zone penetration phenomenon of the seabed slope is effectively prevented by optimizing well position deployment, drilling well production in batches and filling mining cavities, and engineering disasters such as blowout, seabed landslide and methane leakage, geological disasters and environmental problems are avoided; and stable exploitation of the natural gas hydrate reservoir under the seabed slope is ensured.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate exploitation, in particular to a safe exploitation method of natural gas hydrate. Background technique [0002] Natural gas hydrate, commonly known as combustible ice, is a clathrate compound formed by natural gas and water molecules under low temperature and high pressure environment. China is the world's largest energy consumer. In recent years, my country's dependence on energy imports has been increasing. Therefore, it is urgent to find a new energy source to replace traditional fossil energy sources. Natural gas hydrate is recognized as the most promising alternative energy due to its large resource reserves, high energy density and low pollution. It is of great significance to ensure the safe supply of energy, promote the construction of ecological civilization, and maintain sustainable economic and social development. [0003] Gas hydrates are mainly distributed in marine sedi...

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Application Information

Patent Timeline
14 May 2021
Publication
CN112796713A
IPC
E21B43/01; E21B43/26; E21B43/22; E21B43/08; E21B43/30
CPC
E21B43/01; E21B43/26; E21B43/162; E21B43/086; E21B43/30
Inventors
闫传梁; 李振琦