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Compound polyvinyl alcohol drilling fluid applied to storage of hydrates in frozen soil layers

A polyvinyl alcohol and drilling fluid technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of not considering the use of compound hydrate inhibitors, etc., to avoid serious expansion of pore size and good rheology , the effect of good low temperature stability

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 polyvinyl alcohol drilling fluid applied to storage of hydrates in frozen soil layers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1, the contents of each component in the drilling fluid are: the mass ratio of polyvinyl alcohol is 2.8%, the mass ratio of sodium chloride is 9%, the mass ratio of ethylene glycol is 19%, and the mass ratio of sulfonated phenolic resin SMP-2 is 1.8%, the mass ratio of potassium polyacrylate is 1.8%, the mass ratio of xanthan gum is 0.4%, the mass ratio of polyvinyl caprolactam is 0.8%, the mass ratio of ethylene glycol diethyl ether is 0.8%, the tetra-n-hexyl trimethyl bromide The mass ratio of ammonium chloride is 0.8%, and the remaining components are prepared water.

Embodiment 2

[0040] Embodiment two, the content of each component in the drilling fluid is: the mass ratio of polyvinyl alcohol is 3%, the mass ratio of sodium chloride is 10%, the mass ratio of ethylene glycol is 20%, and the mass ratio of sulfonated phenolic resin SMP-2 is 2%, the mass ratio of potassium polyacrylate is 2%, the mass ratio of xanthan gum is 0.5%, the mass ratio of polyvinyl caprolactam is 1%, the mass ratio of ethylene glycol diethyl ether is 1%, tetra-n-hexyl trimethyl bromide The mass ratio of ammonium chloride is 1%, and the remaining components are water for preparation.

Embodiment 3

[0041] Embodiment three, the content of each component in the drilling fluid is: the mass ratio of polyvinyl alcohol is 3.2%, the mass ratio of sodium chloride is 11%, the mass ratio of ethylene glycol is 21%, and the mass ratio of sulfonated phenolic resin SMP-2 is 2.2%, the mass ratio of potassium polyacrylate is 2.2%, the mass ratio of xanthan gum is 0.6%, the mass ratio of polyvinyl caprolactam is 1.2%, the mass ratio of ethylene glycol diethyl ether is 1.2%, the tetra-n-hexyl trimethyl bromide The mass ratio of ammonium chloride is 1.2%, and the remaining components are prepared 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 perfo...

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Abstract

The invention provides compound polyvinyl alcohol drilling fluid applied to storage of hydrates in frozen soil layers and relates to the field of exploitation of natural gas hydrates. The drilling fluid comprises the following components: polyvinyl alcohol, sodium chloride, ethylene glycol, sulfonated phenolic resin SMP-2, potassium polyacrylate, xanthan gum, polyvinyl caprolactam, ethylene glycoldiethyl ether, tetrahexamethyltrimethyl ammonium bromide and prepared water. The drilling fluid is capable of being applied to drilling with storage of the natural gas hydrates in the frozen soil layers, is free of solid phase and 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 easily available raw materials.

Description

technical field [0001] The invention relates to a compound polyvinyl alcohol drilling fluid for hydrate storage in permafrost layers, 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 ...

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
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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