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Frozen-soil natural gas hydrate storage compound type drilling fluid

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, good low temperature stability, and preventing lost circulation

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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  • Frozen-soil natural gas hydrate storage compound type drilling fluid

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 silicate is 2.8%, the mass ratio of sodium chloride is 7%, the mass ratio of ethylene glycol is 19%, the mass ratio of potassium polyacrylate is 1.8%, low The mass ratio of viscosity polyanionic cellulose LV-PAC 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%, tetra-n-hexyltri The mass ratio of methyl ammonium bromide is 0.8%, and the remaining components are prepared water.

Embodiment 2

[0040] Embodiment 2, the content of each component in the drilling fluid is: the mass ratio of sodium silicate is 3%, the mass ratio of sodium chloride is 7.5%, the mass ratio of ethylene glycol is 20%, the mass ratio of potassium polyacrylate is 2%, low The mass ratio of viscosity polyanionic cellulose LV-PAC 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%, tetra-n-hexyltri The mass ratio of methyl ammonium bromide is 1%, and the remaining components are prepared water.

Embodiment 3

[0041] Embodiment 3, the content of each component in the drilling fluid is: the mass ratio of sodium silicate is 3.2%, the mass ratio of sodium chloride is 8%, the mass ratio of ethylene glycol is 21%, the mass ratio of potassium polyacrylate is 2.2%, low The mass ratio of viscosity polyanionic cellulose LV-PAC 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%, tetra-n-hexyltri The mass ratio of methyl ammonium bromide 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 performance. The present ...

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Abstract

The invention discloses frozen-soil natural gas hydrate storage compound type drilling fluid, and relates to the field of natural gas hydrate exploitation. The drilling fluid is prepared from the following components: sodium silicate, sodium chloride, ethylene glycol, potassium polyacrylate, low-viscosity polyanionic cellulose LV-PAC, xanthan gum, polyvinyl caprolactam, polyvinyl methyl ether, tetrahexyltrimethyl ammonium bromide and prepared water. The frozen-soil natural gas hydrate storage compound type drilling fluid can be used for frozen-soil-layer natural gas hydrate storing and drilling, and has the effects of no solid phase and low temperature resistance; a kinetic inhibitor and a synergist are added into the drilling fluid for compounding, so that relatively strong hydrate generation inhibition effect is achieved; and moreover, the drilling fluid is small in environmental harm by components, and has the advantages of being efficient, environmentally friendly, adopting cheap and easily available raw materials, and the like.

Description

technical field [0001] The invention relates to a compound drilling fluid for natural gas hydrate storage in permafrost, 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 to more...

Claims

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Application Information

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