Polyvinyl alcohol compound drilling fluid for natural gas hydrate (NGH) reservoir in frozen soil area

A polyvinyl alcohol and drilling fluid technology, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problem of not considering the use of complex hydrate inhibitors, avoid serious pore size enlargement, and achieve good rheological properties. , the effect of preventing catheter blockage

Inactive Publication Date: 2018-10-02
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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  • Polyvinyl alcohol compound drilling fluid for natural gas hydrate (NGH) reservoir in frozen soil area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1, the content of each component in the drilling fluid is: polyvinyl alcohol mass ratio is 2.8%, sodium chloride mass ratio is 4.5%, methanol mass ratio is 4.5%, ethylene glycol mass ratio is 19%, sulfonated phenolic The mass ratio of resin SMP-2 is 1.8%, the mass ratio of potassium humate 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 propylene glycol phenyl ether is 0.8%, polyethylene The mass ratio of methyl ether is 0.8%, and the remaining components are water for preparation.

Embodiment 2

[0041] Embodiment 2, the content of each component in the drilling fluid is: polyvinyl alcohol mass ratio is 3%, sodium chloride mass ratio is 5%, methanol mass ratio is 5%, ethylene glycol mass ratio is 20%, sulfonated phenolic The mass ratio of resin SMP-2 is 2%, the mass ratio of potassium humate is 2%, the mass ratio of xanthan gum is 0.5%, the mass ratio of polyvinylpyrrolidone K90 is 1%, the mass ratio of propylene glycol phenyl ether is 1%, polyethylene The mass ratio of methyl ether is 1%, and the remaining components are water for preparation.

Embodiment 3

[0042] Embodiment three, the content of each component in the drilling fluid is: polyvinyl alcohol mass ratio is 3.2%, sodium chloride mass ratio is 5.5%, methanol mass ratio is 5.5%, ethylene glycol mass ratio is 21%, sulfonated phenolic The mass ratio of resin SMP-2 is 2.2%, the mass ratio of potassium humate 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 propylene glycol phenyl ether is 1.2%, polyethylene The mass ratio of methyl ether is 1.2%, and the remaining components are water for preparation.

[0043] 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:

[0044] 1 Evaluation of drilling fluid shale hydration inhibition

[0045] Inhibition evaluation experiment is an important part of the indoor evaluation of drilling fluid related performance. The present...

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Abstract

The invention discloses a polyvinyl alcohol compound drilling fluid for natural gas hydrate (NGH) reservoir in a frozen soil area, and relates to the field of NGH exploitation. The drilling fluid comprises following components: polyvinyl alcohol, sodium chloride, methanol, glycol, sulfonated phenolic resin (SMP-2), potassium humate, xanthan gum, polyvinylpyrrolidone K-90, propylene glycol phenyl ether, polyvinyl methyl ether, and make-up water. The drilling fluid is suitable for NGH drill wells in a frozen soil layer, does not contain any solid phase, and is resistant to low temperature. The drilling fluid is compounded with a kinetic inhibitor and a synergist to inhibit the generation of hydrates. Moreover, the components of the drilling fluid are basically harmless to the environment, and the drilling fluid has the advantages that the efficiency is high, the environment is protected, and the raw materials are cheap and easily available.

Description

technical field [0001] The invention relates to a polyvinyl alcohol compound drilling fluid for storage of frozen soil hydrate, 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
CPCC09K8/12C09K2208/12C09K2208/22C09K2208/28C09K2208/34
Inventor 袁鹏飞张晓丽
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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