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Method and system for exploiting natural gas hydrates in sea area by combining geotherm with CO2 replacement

A natural gas and hydrate technology, which is applied in the fields of fluid extraction, earthwork drilling, and climate sustainability, can solve problems such as poor geomechanical stability, destructive sediment layers, and low geothermal utilization, and achieve CO2 emission reduction, The effect of maintaining the integrity of the sediment layer

Inactive Publication Date: 2017-06-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

However, the existing geothermal utilization rate is still very low
[0003] The prior art sea area natural gas exploitation causes serious damage to the sediment layer and poor stability of geomechanics

Method used

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  • Method and system for exploiting natural gas hydrates in sea area by combining geotherm with CO2 replacement
  • Method and system for exploiting natural gas hydrates in sea area by combining geotherm with CO2 replacement

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Embodiment Construction

[0023] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0024] A combined geothermal and CO 2 The method for substituting natural gas hydrate in exploitation sea area is characterized in that it comprises the following steps:

[0025] The first step, the preparation of the injection well and the production well, preset at least one injection well and at least one production well, the upper wellheads of the injection well and the production well are all located on the ocean exploitation platform, the lower of the injection well and the production well The wellheads are all located on the fracturing fracture zone of the geothermal layer; the production well is located at the well section of the natural gas hydrate reservoir and has jet holes;

[0026] In the second step, the upper wellhead of the injection well is passed through the pipeline and CO 2 The storage device is communicated, and a high-pressure injectio...

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Abstract

The invention relates to a sea-area natural gas hydrate exploiting technology, in particular to a method and system for exploiting natural gas hydrates in sea area by combining geotherm with CO2 replacement. The method includes the steps: preparing injection wells and producing wells, exploiting the sea-area natural gas hydrate, and separating natural gas. The system includes an ocean exploiting platform, one or more producing wells and one or more injection wells, lower well mouths of the injection wells penetrate into the positions where fractured crack zones of the geothermal layer are located, and the lower well mouths of the injection wells are communicated with fractured cracks on the fractured crack zones of the geothermal layer; upper well mouths of the injection wells are communicated with a high-pressure injection pump, the high-pressure injection pump is communicated with a CO2 storage device through pipelines; lower well mouths of the producing wells penetrate into the positions where the fractured crack zones of the geothermal layer are located, and the lower well mouths of the injection wells are communicated with the fractured cracks on the fractured crack zones of the geothermal layer. Because of the structure, the method and system have the advantages that emission of greenhouse gas CO2 is reduced, the integrality of the sediment layer is maintained, and the geomechanics stability of the sediment layer is maintained.

Description

technical field [0001] The invention relates to sea area natural gas exploitation technology, especially a method for reducing greenhouse gas CO 2 Combined geothermal and CO emissions, maintenance of sediment layer integrity, and maintenance of sediment layer geomechanical stability 2 A method and system for replacing natural gas hydrates in sea areas. Background technique [0002] Geothermal resource is the natural heat contained in the earth's crust, and it is a renewable resource that can make a significant contribution to the sustainable and diversified energy structure in the 21st century. From the perspective of global geological structure, high-temperature geothermal resource belts above 150 °C mainly appear in the edges, collision zones, cracks and depressions of major plates in the crustal surface. Geothermal resources exist in certain geological structures, have obvious mineral resource attributes, and have the duality of mineral resources and water resources. Th...

Claims

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Application Information

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IPC IPC(8): E21B43/01E21B43/16E21B43/24E21B43/34
CPCE21B41/0099E21B43/01E21B43/164E21B43/24E21B43/34Y02P90/70
Inventor 孙致学董云振辛莹孙治雷刘熙远周昊天王浩瑄徐东齐王通刘继芹何楚翘秦浩吕抒桓黄勇
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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