Slant well marine gas hydrate extracting method

A mining method and hydrate technology, applied in mining fluid, coal gasification, underground mining, etc., can solve the problems of high cost, long distance, small contact area, etc., and achieve the effect of high development efficiency and easy collection

Active Publication Date: 2017-05-24
DALIAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

The vertical well drilling technology is the earliest and relatively mature drilling technology, which is simple to operate and low in cost, but has a small contact area with the reservoir and low production; the horizontal well drilling technology has a longer distance through the reservoir and a larger contact area. Single well production is high, but the cost is high
Hydrate reservoirs are mostly distributed in an inclined shape. Considering the complexity of actual reservoir conditions, the above two drilling techniques may be limited in actual conditions

Method used

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  • Slant well marine gas hydrate extracting method
  • Slant well marine gas hydrate extracting method
  • Slant well marine gas hydrate extracting method

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Embodiment Construction

[0021] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0022] A method for exploiting marine natural gas hydrate in inclined wells, the steps are as follows:

[0023] (1) if figure 1 As shown, three production wells with the same spacing are set according to the length of the hydrate reservoir, and the interval between two production wells is W. Determine the position of the vertical well, the inclination angle of the hydrate reservoir is α, and the thickness is H, then the length of the inclination well The inclination angle is If there is a free gas layer under the hydrate reservoir, the inclined well can penetrate the hydrate reservoir and extend to the free gas layer.

[0024] (2) Drilling, using low-temperature mud to drill vertical wells in the hydrate caprock to penetrate the hydrate reservoir, and using directional drilling tools to drill inclined ...

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Abstract

The invention belongs to the technical field of marine gas hydrate extraction and provides a slant well marine gas hydrate extracting method. The method comprises, after a drilling location is determined, performing well drilling through a semi-submersible drilling platform to construct a hydrate extracting well; running waterproof casing pipes, which are provided with three layers of pipe walls, inside the hydrate extracting well; cementing the front ends of the waterproof casing pipes inside a vertical well and a slant well for fixation; performing gas hydrate extraction in a depressurizing and heat injection combined manner, and injecting hot brine through a heat injection pipe to break phase equilibrium of gas hydrate to decompose the gas hydrate; extracting cooled liquid through a reflux pipe for recycling; through a gas-liquid mixed flow pump, extracting free gas and water, which are generated by decomposing the gas hydrate, from an extracting pipe, and performing further depressurized decomposition on the gas hydrate; performing gas-liquid separation on gas-liquid mixtures conveyed to the ground, and then storing separated natural gas inside high-pressure gas tanks.

Description

technical field [0001] The invention belongs to the technical field of marine natural gas hydrate exploitation, and provides a method for exploiting marine natural gas hydrate in inclined wells. Background technique [0002] The development and progress of society depend on the development and utilization of energy. Since the Industrial Revolution, the demand for fossil fuels has increased dramatically. Fossil energy is non-renewable energy with limited reserves, and traditional fossil fuels will cause a series of environmental problems such as air pollution and greenhouse effect. Therefore, finding a new type of energy that can replace traditional fossil energy is an urgent problem to be solved today. Natural gas hydrate is a new type of energy with great potential for development. Its main components are hydrocarbons and water, which are cleaner than traditional fossil fuels. It has large reserves and is widely found in plateau permafrost regions and oceanic continental ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/30E21B43/01E21B43/295E21B43/16E21B43/24E21B17/18
CPCE21B17/18E21B41/0099E21B43/01E21B43/16E21B43/24E21B43/295E21B43/305
Inventor 宋永臣杨明军孙荣徽刘瑜刘卫国陈兵兵郑嘉男
Owner DALIAN UNIV OF TECH
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