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Natural gas hydrate storage compound drilling fluid for frozen earth region

A drilling fluid and natural gas technology, which is applied in the field of complex drilling fluids for natural gas hydrate storage in permafrost areas, can solve the problem of not considering the use of complex hydrate inhibitors, avoid serious pore size enlargement, prevent a large number of decomposition, The effect of reducing the degree of formation leakage

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
  • Natural gas hydrate storage compound drilling fluid for frozen earth region
  • 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: 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 polyvinyl caprolactam is 0.8%, the mass ratio of ethylene glycol butyl ether is 0.8%, and the mass ratio of tetra-n-hexyltrimethylammonium bromide is 0.8%, and the remaining components are the preparation 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 polyvinylcaprolactam is 1%, the mass ratio of ethylene glycol butyl ether is 1%, and the mass ratio of tetra-n-hexyltrimethylammonium bromide is 1%, and the remaining components are made up 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 polyvinylcaprolactam is 1.2%, the mass ratio of ethylene glycol butyl ether is 1.2%, and the mass ratio of tetra-n-hexyltrimethylammonium bromide is 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 ...

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Abstract

The invention discloses a natural gas hydrate storage compound drilling fluid for a frozen earth region, relating to the field of exploration of natural gas hydrate. The drilling fluid comprises the following components: sodium formate, sodium chloride, ethylene glycol, potassium humate, potassium polyacrylate, xanthan gum, polyvinyl caprolactam, ethylene glycol diethyl ether, 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 availableraw materials and the like.

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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Patent Type & Authority Applications(China)
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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