A method for mining hydrates based on multilateral wells
A hydrate and multi-branch technology, applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., can solve the problems of accelerated hydrate production, high development cost, low utilization rate of thermal excitation, etc., achieving environmental and Significant economic benefits, low development cost, and the effect of multi-dimensional three-dimensional mining
Active Publication Date: 2021-11-23
NORTHEAST GASOLINEEUM UNIV
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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 to be exploited in large quantities, and at the same time make up for the low utilization rate of thermal stimulation and high development costs in traditional mining methods. question
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[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. The angle between the horizontal wells in the same stratum of the gas hydrate reservoir is 180°. The hole point distance is 5-10 meters.
[0019] A gas-water separation d...
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A method for producing hydrates based on multilateral wells. The method includes the following steps: a vertical well is deployed in the target measure area, and two horizontal branch wells are deployed in the gas hydrate reservoir; one of the horizontal branch wells is deployed in the upper third of the gas hydrate reservoir, and the other horizontal branch well is deployed in the gas hydrate reservoir. The lower third of the natural gas hydrate reservoir; the gas-water separation device and pump are installed at the junction of the vertical well and the lower third of the horizontal well; the vertical well is deployed to the top of the high-temperature and high-pressure water-bearing gas reservoir, and the perforation opens the high-temperature and high-pressure water-bearing gas reservoir and hydrate reservoirs; the produced mixture is separated into natural gas and high-temperature water by the gas-water separation device, and the separated natural gas enters the oil pipeline, and the high-temperature water is pumped into the hydrate reservoir through the gas-water separation device; The horizontal wells in the upper third of the reservoir exploit hydrate reservoirs, and a horizontal well group for injecting high-temperature water above the gas hydrate reservoirs is formed in the gas hydrate reservoirs. The invention raises the temperature and lowers the pressure to exploit the natural gas hydrate reservoir, and realizes the circular 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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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