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A water flow erosion method assisted double-split well depressurization marine natural gas hydrate production method

A mining method and technology for hydrates, applied in the fields of production of fluids, earth-moving drilling, wellbore/well components, etc.

Active Publication Date: 2021-06-08
DALIAN UNIV OF TECH
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Problems solved by technology

[0004] Aiming at the problem of sand production in the current natural gas hydrate mining method, the present invention proposes a new natural gas hydrate mining method

Method used

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  • A water flow erosion method assisted double-split well depressurization marine natural gas hydrate production method

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Embodiment Construction

[0015] The specific implementation manners of the present invention will be further described below in conjunction with the technical solutions and accompanying drawings.

[0016] A method for exploiting marine natural gas hydrate with the aid of a water flow erosion method for double-split well depressurization, the steps are as follows:

[0017] (1) Select the drilling location, use double split wells to produce wells, and the two split wells are symmetrically distributed, such as figure 1 Mechanical sand control devices 6 are installed at the bottom of the sub-wells, and they are all connected to the centrifugal pump 3; there is a selection switch 7 in the middle of the double sub-wells. Then it is in communication with the production well 2, and the selection switch 7 can be controlled on the offshore production platform 1;

[0018] (2) The sub-well ② is used to depressurize the production of hydrate, and transport the gas and water generated by the decomposition of hydra...

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Abstract

The invention belongs to the technical field of marine natural gas hydrate exploitation, and relates to a double split well depressurization marine natural gas hydrate exploitation method assisted by a water flow erosion method. Double-split production wells are drilled near the hydrate reservoir at the bottom of the production well, and mechanical sand control devices are installed at the bottom of the split wells; the double-split wells are operated at the same time. It is used for water flow erosion-assisted production; the two-split wellbore mode can be reversed by selecting the switch, and the original depressurization production sub-well is converted into a water-flow erosion-assisted production sub-well. Water injection can not only assist in production, but also eliminate sand deposits in sub-wells; the original water flow erodes the assisted production sub-wells with little or no sand accumulation, and after connecting with production wells, it can be converted into depressurized production sub-wells, and the gas production can reach 100%. Requirements: When the gas production is insufficient, continue to switch the two-split well mode through the selection switch to realize the continuous and efficient exploitation of subsea natural gas hydrate.

Description

technical field [0001] The invention belongs to the technical field of marine natural gas hydrate exploitation, and relates to a double split well depressurization marine natural gas hydrate exploitation method assisted by a water flow erosion method. Background technique [0002] Natural gas hydrate is an energy source with huge energy reserves. It not only has the characteristics of high efficiency and high energy accumulation, but also is an environmentally friendly energy source. Therefore, many countries have researched and carried out trial production of natural gas hydrate. The main mining techniques used are depressurization method and heat injection method. According to the mining effect, the depressurization method is the simplest and most economical mining method, and the depressurization method is the main method, combined with other auxiliary mining methods, the effect is better. [0003] The problem of sand production in the test production process is the key ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/01E21B43/30E21B43/02
CPCE21B43/01E21B43/02E21B43/30
Inventor 宋永臣赵国钧杨明军赵越超孙慧茹赵佳飞陈兵兵
Owner DALIAN UNIV OF TECH
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