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Compound drilling fluid applied to storage of natural gas hydrates in frozen soil areas

A drilling fluid and natural gas technology, which is applied in the field of drilling fluid for natural gas hydrate storage in compound permafrost regions, can solve the problems of not considering the use of compound hydrate inhibitors, and avoid serious expansion of pore size, reduce damage, and reduce Effect of Drilling Accident Odds

Inactive Publication Date: 2018-08-03
DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above drilling fluids all have certain effects on the drilling of natural gas hydrate reservoirs, but none of them consider the use of compound hydrate inhibitors

Method used

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  • Compound drilling fluid applied to storage of natural gas hydrates in frozen soil areas
  • Compound drilling fluid applied to storage of natural gas hydrates in frozen soil areas
  • Compound drilling fluid applied to storage of natural gas hydrates in frozen soil areas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1, the content of each component in the drilling fluid is: the mass ratio of sodium formate is 2.8%, the mass ratio of sodium chloride is 7%, the mass ratio of ethylene glycol is 19%, the mass ratio of low viscosity carboxymethyl cellulose LV-CMC The mass ratio of potassium polyacrylate is 1.8%, the mass ratio of xanthan gum is 0.4%, the mass ratio of polyvinylpyrrolidone K90 is 0.8%, the mass ratio of polyethylene oxide is 0.8%, and the mass ratio of polyvinyl methyl ether is 0.8%, and the remaining components are the preparation water.

Embodiment 2

[0040] Embodiment 2, the contents of each component in the drilling fluid are: the mass ratio of sodium formate is 3%, the mass ratio of sodium chloride is 7.5%, the mass ratio of ethylene glycol is 20%, and the mass ratio of low-viscosity carboxymethylcellulose LV-CMC 2%, the mass ratio of potassium polyacrylate is 2%, the mass ratio of xanthan gum is 0.5%, the mass ratio of polyvinylpyrrolidone K90 is 1%, the mass ratio of polyethylene oxide is 1%, and the mass ratio of polyvinyl methyl ether is 1%, and the remaining components are made up water.

Embodiment 3

[0041] Embodiment three, the contents of each component in the drilling fluid are: the mass ratio of sodium formate is 3.2%, the mass ratio of sodium chloride is 8%, the mass ratio of ethylene glycol is 21%, and the mass ratio of low-viscosity carboxymethylcellulose LV-CMC The mass ratio of potassium polyacrylate is 2.2%, the mass ratio of xanthan gum is 0.6%, the mass ratio of polyvinylpyrrolidone K90 is 1.2%, the mass ratio of polyethylene oxide is 1.2%, and the mass ratio of polyvinyl methyl ether is 1.2%, and the remaining components are the preparation water.

[0042] The drilling fluid configuration methods of the above-mentioned examples 1, 2, and 3 are conventional drilling fluid configuration methods, and are evaluated by the following experimental methods:

[0043] 1 Evaluation of drilling fluid shale hydration inhibition

[0044] Inhibition evaluation experiment is an important part of the indoor evaluation of drilling fluid related performance. The present inventi...

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Abstract

The invention provides compound drilling fluid applied to storage of natural gas hydrates in frozen soil areas and relates to the field of exploitation of natural gas hydrates. The drilling fluid comprises the following components: sodium formate, sodium chloride, ethylene glycol, low-viscosity carboxymethyl cellulose LV-CMC, potassium polyacrylate, xanthan gum, polyvinylpyrrolidone K90, polyethylene oxide, polyvinyl methyl ether and prepared water. The drilling fluid is capable of being applied to drilling with storage of the natural gas hydrates in frozen soil layers, is free of solid phaseand has resistance to low temperature; a kinetic inhibitor is added into the drilling fluid and is compounded with a synergist; the drilling fluid has an excellent effect of inhibiting generation of hydrates; meanwhile, the components of the drilling fluid are low in harm to the environment; and the drilling fluid has the advantages of high efficiency, environment friendliness and cheap and easilyavailable raw materials.

Description

technical field [0001] The invention relates to a compound drilling fluid for natural gas hydrate storage in permafrost regions, in particular to the field of natural gas hydrate exploitation. Background technique [0002] Natural gas hydrates are mainly distributed in the deep-water areas of the continental margins and the permafrost areas on land. Natural gas hydrate is one of the potential alternative energy sources, and the research on natural gas hydrate is a hot spot in contemporary earth science and energy industry development research. However, most of the researches are on gas hydrates in deep ocean, and there are relatively few studies on gas hydrates in permafrost areas on land. Drilling is an essential means to explore and develop natural gas hydrates at a certain depth in permafrost. The nature of gas hydrate phase equilibrium determines that drilling in this type of formation is very different from drilling in general oil and gas formations, and it also leads...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12
CPCC09K8/12
Inventor 袁鹏飞张晓丽李新宋鑫黄岩李海洋
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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