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Drilling fluid for natural gas hydrate reservoir in permafrost region

A drilling fluid and natural gas technology, applied in the field of drilling fluid, can solve the problems of not considering the use of compound hydrate inhibitors, and achieve the effects of avoiding serious expansion of pore diameter, preventing pipe blockage, reducing and preventing repeated crushing

Inactive Publication Date: 2018-07-06
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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  • Drilling fluid for natural gas hydrate reservoir in permafrost region
  • Drilling fluid for natural gas hydrate reservoir in permafrost region
  • Drilling fluid for natural gas hydrate reservoir in permafrost region

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 potassium humate is 1.8%, polyacrylic acid The mass ratio of potassium 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 ethylene glycol ether is 0.8%, and the mass ratio of polyvinyl methyl ether is 0.8%. Divided into prepared water.

Embodiment 2

[0040] Embodiment 2, the content of each component in the drilling fluid is: 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%, the mass ratio of potassium humate is 2%, polyacrylic acid The mass ratio of potassium is 2%, the mass ratio of xanthan gum is 0.5%, the mass ratio of polyvinylpyrrolidone K90 is 1%, the mass ratio of ethylene glycol ether is 1%, and the mass ratio of polyvinyl methyl ether is 1%. Divided into prepared water.

Embodiment 3

[0041] Embodiment 3, the content of each component in the drilling fluid is: 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%, the mass ratio of potassium humate is 2.2%, polyacrylic acid The mass ratio of potassium 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 ethylene glycol ether is 1.2%, and the mass ratio of polyvinyl methyl ether is 0.8%-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 invention adopts mud s...

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Abstract

The invention discloses a drilling fluid for a natural gas hydrate reservoir in a permafrost region, and relates to the field of natural gas hydrate exploitation. The drilling fluid comprises the following components: sodium formate, sodium chloride, ethylene glycol, potassium humate, potassium polyacrylate, xanthan gum, polyvinylpyrrolidone K90, ethylene glycol ether, polyvinyl methyl ether and water for preparation. The drilling fluid can be used for drilling the natural gas hydrate reservoir in permafrost, has no solid phase and has low-temperature resistance; through addition of a kineticinhibitor and a synergist which are compounded with each other, the drilling fluid has a relatively strong hydrate formation inhibiting effect; in addition, the drilling fluid comprises the componentshaving small damage to the environment, and has the advantages of high efficiency, environment friendliness, cheap and easily available raw materials and the like.

Description

technical field [0001] The invention relates to a drilling fluid used 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 to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12
CPCC09K8/12C09K2208/12C09K2208/22
Inventor 张晓丽袁鹏飞
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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