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Device for evaluating natural gas hydrate phase state stability by drilling fluid additive and experimental method

A technology for evaluating equipment and natural gas, applied in earthwork drilling, wellbore/well components, teaching models, etc., can solve problems such as few test data and complexity

Active Publication Date: 2021-01-29
CHINA UNIV OF PETROLEUM (EAST CHINA) +2
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  • Description
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  • Application Information

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Problems solved by technology

At present, due to the influence of temperature, pressure and chemical agents, the mechanism of drilling fluid additives on the phase stability of natural gas hydrate is quite complicated, and there are few test data, and there is no systematic explanation for the mechanism of wellbore stability, so it has become a field of natural gas hydrate drilling research. a difficulty of

Method used

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  • Device for evaluating natural gas hydrate phase state stability by drilling fluid additive and experimental method
  • Device for evaluating natural gas hydrate phase state stability by drilling fluid additive and experimental method
  • Device for evaluating natural gas hydrate phase state stability by drilling fluid additive and experimental method

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Experimental program
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Effect test

Embodiment 1

[0053] Such as figure 1 As shown, an evaluation device for the phase stability of natural gas hydrate by drilling fluid additives, including gas injection system, liquid injection system, vacuum system, natural gas hydrate simulated reservoir system, reservoir permeability measurement system, drilling fluid circulation system, natural gas hydrate simulated reservoir temperature, pressure monitoring system, and reactor temperature control system. The gas injection system injects gas into the natural gas hydrate simulated reservoir to provide gas source for the formation of natural gas hydrate; the liquid injection system injects water into the natural gas hydrate simulated reservoir to provide water source for the formation of natural gas hydrate; And the pipeline is vacuumed to ensure the purity of the natural gas hydrate simulated reservoir preparation process; the natural gas hydrate simulated reservoir system is used to simulate the natural gas hydrate reservoir and provide...

Embodiment 2

[0064] To evaluate the stability experiment of drilling fluid additives on the phase state of natural gas hydrate, using the device described in Example 1, the main steps include:

[0065] (1) Create natural gas hydrate simulated reservoirs

[0066] According to the experimental design requirements, pre-fill the sand sample into the natural gas hydrate simulation reactor 4, and adjust the second valve 112, the third valve 113, the fourth valve 116, the fifth valve 122, the sixth valve 123, and the seventh valve after filling. Valve 126, the eighth valve 134, and the back pressure valve 152 are in the closed state, open the ninth valve 143, the first valve 103 and use the vacuum pump to remove the air in the experimental pipeline; close the ninth valve 143, open the fifth valve 122, the sixth The valve 123 and the seventh valve 126 set the total amount of injected natural gas according to the natural gas hydrate saturation; close the fifth valve 122, the sixth valve 123, and th...

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Abstract

The invention relates to a device for evaluating natural gas hydrate phase state stability by a drilling fluid additive and an experimental method, and belongs to the technical field of natural gas hydrate development. The device comprises a gas injection system, a liquid injection system, a vacuumizing system, a natural gas hydrate simulation reservoir system, a reservoir permeability measurementsystem, a drilling fluid circulation system, a natural gas hydrate simulation reservoir temperature and pressure monitoring system and a reaction kettle temperature control system. Real horizontal well drilling working conditions can be simulated, real-time measurement of the influence range of the drilling fluid additive in a natural gas hydrate reservoir is achieved, and dynamic distribution ofa natural gas hydrate decomposition interface and the hydrate decomposition rate in the reservoir can be obtained.

Description

technical field [0001] The invention relates to a device and an experiment method for evaluating the stability of a drilling fluid additive to the phase state of a natural gas hydrate, and belongs to the technical field of natural gas hydrate development. Background technique [0002] Natural gas hydrate is a crystalline substance formed by natural gas and water under high pressure and low temperature conditions. The total amount of natural gas hydrate resources in the world is about twice the total amount of traditional fossil energy, and more than 90% are distributed in sea areas. The natural gas hydrate resources in my country's sea areas The volume is about 80 billion tons of oil equivalent, which is an important potential high-efficiency clean oil and gas replacement energy. In recent years, many developed countries such as Russia, the United States, Japan, and Canada have carried out research on natural gas hydrate mining technology, and my country's deep-water natural ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/01E21B49/00G09B25/02
CPCE21B43/01E21B49/00G09B25/02
Inventor 王金堂吕开河孙金声王韧白英睿刘敬平黄贤斌金家锋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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