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Frozen-soil hydrate deposit polyvinyl alcohol type drilling fluid

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 enlargement of the pore size, and prevent lost circulation. , the effect of preventing catheter blockage

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 hydrate deposit polyvinyl alcohol type drilling fluid
  • Frozen-soil hydrate deposit polyvinyl alcohol type drilling fluid
  • Frozen-soil hydrate deposit polyvinyl alcohol type drilling fluid

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 K30 is 0.8%, and the mass ratio of polyethylene oxide is 0.8%. Divided into prepared water.

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 K30 is 1%, and the mass ratio of polyethylene oxide is 1%. Divided into prepared water.

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 K30 is 1.2%, and the mass ratio of polyethylene oxide is 1.2%. Divided into prepared water.

[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 invention adopts mud shale expansion inhibition experiment for testing, and the specif...

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Abstract

The invention discloses frozen-soil hydrate deposit polyvinyl alcohol type drilling fluid, and relates to the field of natural gas hydrate exploitation. The drilling fluid is prepared from the following components: polyvinyl alcohol, sodium chloride, methyl alcohol, ethylene glycol, sulfonated phenolic resin SMP-2, potassium humate, xanthan gum, polyvinylpyrrolidone K30, polyoxyethylene and prepared water. The frozen-soil hydrate storage polyvinyl alcohol type drilling fluid can be used for frozen-soil-layer natural gas hydrate deposit 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 polyvinyl alcohol type drilling fluid for storing 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 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 袁鹏飞张晓丽
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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