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Compound drilling fluid for natural gas hydrate (NGH) reservoir in frozen soil area

A drilling fluid and natural gas technology, which is applied in the field of compound drilling fluid for natural gas hydrate storage in permafrost areas, can solve the problem of not considering the use of compound hydrate inhibitors, and achieves avoiding serious enlargement of pore size and good low temperature stability. , The effect of enhancing the hydrate formation inhibitory effect

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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  • Compound drilling fluid for natural gas hydrate (NGH) reservoir in frozen soil area
  • Compound drilling fluid for natural gas hydrate (NGH) reservoir in frozen soil area
  • Compound drilling fluid for natural gas hydrate (NGH) reservoir in frozen soil area

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 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 polyvinyl methyl ether is 0.8%, the tetra-n-butyl ammonium phosphate The mass ratio is 0.8%, and the remaining components are water for preparation.

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 polyvinyl caprolactam is 1%, the mass ratio of polyvinyl methyl ether is 1%, the tetra-n-butyl ammonium phosphate The mass ratio is 1%, and the remaining components are water for preparation.

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 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 polyvinyl methyl ether is 1.2%, the tetra-n-butyl ammonium phosphate The mass ratio is 1.2%, and the rest is water for preparation.

[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 ...

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Abstract

The invention discloses a 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: sodium formate, sodium chloride, glycol, low viscosity carboxymethyl cellulose (LV-CMC), potassium polyacrylate, xanthan gum, polyvinyl caprolactam, polyvinyl methyl ether, tetra-n-butyl ammonium phosphate, 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 fluidis 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 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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IPC IPC(8): C09K8/12
CPCC09K8/12C09K2208/12C09K2208/22
Inventor 袁鹏飞张晓丽
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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