Method for mining hydrate based on multilateral wells

A hydrate and multi-branch technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of accelerated hydrate production, high development cost, low utilization rate of thermal excitation, etc. Significant economic benefits, convenient operation, and the effect of multi-dimensional three-dimensional mining

Active Publication Date: 2020-01-03
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology

The present invention adopts the separation and same well injection-production mining method to mine hydrate reservoirs, which can accelerate the hydrate mining speed, enable hydrates

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  • Method for mining hydrate based on multilateral wells

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing, the implementation of the present invention is further described:

[0017] According to the geological structure conditions, the measurement area is the sea area or land where there are hydrate reservoirs and high-temperature and high-pressure natural gas reservoirs under the hydrate reservoirs. The thickness of the hydrate reservoirs is not less than 20 meters, and the high-temperature and high-pressure gas reservoirs contain Bottom water.

[0018] Establish multi-branch wells, determine the target measure area, vertical wells penetrate the overburden and caprock, and deploy two horizontal wells in the upper third and lower third of the gas hydrate reservoir. The two horizontal wells above and below the gas hydrate reservoir are parallel to each other, and the angle between the horizontal wells in the same formation of the gas hydrate reservoir is 180°. The length of the four-stage horizontal well is 800-1000m, and the h...

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Abstract

A method for mining hydrate based on multilateral wells is provided. The method includes the following steps: deploying a vertical well in a target measure area and two horizontal multilateral wells in a natural gas hydrate reservoir, wherein one of the horizontal multilateral wells is deployed at the upper third of the natural gas hydrate reservoir, and the other horizontal multilateral well is deployed at the lower third of the gas hydrate reservoir; installing a gas-water separation device and a pump at the junction of the vertical well and the lower third horizontal well; deploying the vertical well to the top of a high-temperature and high-pressure water-bearing gas reservoir; performing perforation to open the high-temperature and high-pressure water-bearing gas reservoir and the hydrate reservoir; separating the mined mixture into natural gas and high-temperature water by the gas-water separation device, wherein separated natural gas enters an oil pipe and the high-temperature water is pumped into a hydrate reservoir by the gas-water separation device; at the same time, mining the hydrate reservoir in horizontal wells located at the upper third of the natural gas hydrate reservoir, and mining horizontal well groups of the hydrate reservoir by injecting high-temperature water under the formation of the natural gas hydrate reservoir. According to the present invention, thenatural gas hydrate reservoir is mined by heating and depressurizing, thereby achieving the cyclic utilization of formation energy.

Description

technical field [0001] The invention relates to a method for joint exploitation of high-temperature and high-pressure gas reservoirs and hydrate reservoirs, which is applied in the field of natural gas hydrate exploitation. Background technique [0002] As clean energy with abundant reserves, geothermal energy and hydrate have attracted widespread attention from various countries. Among them, geothermal energy generally refers to the energy released by the earth. According to the properties of heat storage bodies, geothermal energy can be divided into hydrothermal, enhanced and shallow geothermal energy resources. Hydrates are currently distributed in deep-sea sediments or permafrost in land areas. They are ice-like crystalline substances formed by natural gas and water under high-pressure and low-temperature conditions. At present, the proposed exploitation of marine natural gas hydrate mainly includes thermal shock mining method, depressurization mining method, and chemic...

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Application Information

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IPC IPC(8): E21B43/24E21B43/14E21B43/11E21B43/01
CPCE21B43/01E21B43/11E21B43/14E21B43/24
Inventor 李占东田鑫张海翔李中董钊李吉郭永宾孟文波
Owner NORTHEAST GASOLINEEUM UNIV
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