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Natural gas hydrate storage compound drilling fluid for frozen earth region

A drilling fluid and natural gas technology, applied in the field of natural gas hydrate exploitation, can solve the problems of not considering the use of compound hydrate inhibitors, and achieve the effects of avoiding serious expansion of pore diameter, reducing decomposition, and reducing the probability of drilling accidents

Inactive Publication Date: 2018-11-02
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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  • Natural gas hydrate storage compound drilling fluid for frozen earth region

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1, the content of each component in the drilling fluid is: polyethylene glycol mass ratio is 3.5%, sodium chloride mass ratio is 9%, ethylene glycol mass ratio is 19%, low viscosity carboxymethyl cellulose LV- The mass ratio of CMC 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 polyvinylcaprolactam is 0.8%, the mass ratio of ethylene glycol butyl ether is 0.8%, and the tetra-n-hexyl The mass ratio of trimethylammonium bromide is 0.8%, and the remaining components are preparation water.

Embodiment 2

[0040] Embodiment two, the contents of each component in the drilling fluid are: polyethylene glycol mass ratio is 4%, sodium chloride mass ratio is 10%, ethylene glycol mass ratio is 20%, low viscosity carboxymethyl cellulose LV- The mass ratio of CMC 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 butyl ether is 1%, tetra-n-hexyl The mass ratio of trimethylammonium bromide is 1%, and the remaining components are prepared water.

Embodiment 3

[0041] Embodiment three, the contents of each component in the drilling fluid are: polyethylene glycol mass ratio is 4.5%, sodium chloride mass ratio is 11%, ethylene glycol mass ratio is 21%, low viscosity carboxymethyl cellulose LV- The mass ratio of CMC 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 butyl ether is 1.2%, and the tetra-n-hexyl The mass ratio of trimethylammonium bromide is 1.2%, and the remaining components are 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 ...

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Abstract

The invention discloses a natural gas hydrate storage compound drilling fluid for a frozen earth region and relates to the field of exploration of natural gas hydrate. The drilling fluid comprises thefollowing components: polyethylene glycol, sodium chloride, ethylene glycol, low viscosity carboxymethylcellulose LV-CMC, potassium polyacrylate, xanthan gum, polyvinyl caprolactam, butyl cellosolve,tetracaproyl trimethyl ammonium bromide and prepared water. The drilling fluid can be used for drilling the natural gas hydrate storage drilling of a frozen layer, and plays roles of being free of solid phases and low-temperature resistant. By adding a dynamic inhibitor into the drilling fluid to be compounded with a synergist, the drilling fluid has a relatively high hydrate generation inhibiting effect, and the components of the drilling fluid are small in environmental damage, so that the drilling fluid has the advantages of high efficiency, environmental protection, low cost of raw materials, easily available materials and the like.

Description

technical field [0001] The invention relates to a compound drilling fluid for natural gas 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 leads ...

Claims

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Application Information

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