Complex frozen soil hydrate storage polyvinyl alcohol drilling fluid

A polyvinyl alcohol and drilling fluid technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of not considering the use of compound hydrate inhibitors, so as to avoid serious expansion of pore size, reduce damage, The effect of good rheology

Inactive Publication Date: 2018-08-24
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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  • Complex frozen soil hydrate storage polyvinyl alcohol drilling fluid
  • Complex frozen soil hydrate storage polyvinyl alcohol drilling fluid
  • Complex frozen soil hydrate storage polyvinyl alcohol drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1, the content of each component in the drilling fluid is: the mass ratio of polyvinyl alcohol is 2.8%, the mass ratio of sodium chloride is 9%, the mass ratio of ethylene glycol is 19%, and the mass ratio of sulfonated phenolic resin SMP-2 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 polyvinylpyrrolidone K90 is 0.8%, the mass ratio of polyethylene oxide is 0.8%, the mass ratio of propylene glycol phenyl ether is 0.8%, and the rest The component is preparation water.

Embodiment 2

[0040] Embodiment 2, the content of each component in the drilling fluid is: the mass ratio of polyvinyl alcohol is 3%, the mass ratio of sodium chloride is 10%, the mass ratio of ethylene glycol is 20%, and the mass ratio of sulfonated phenolic resin SMP-2 is 2%, the mass ratio of potassium polyacrylate is 2%, the mass ratio of xanthan gum is 0.5%, the mass ratio of polyvinylpyrrolidone K90 is 1%, the mass ratio of polyethylene oxide is 1%, the mass ratio of propylene glycol phenyl ether is 1%, and the rest The component is preparation water.

Embodiment 3

[0041] Embodiment 3, the content of each component in the drilling fluid is: the mass ratio of polyvinyl alcohol is 3.2%, the mass ratio of sodium chloride is 11%, the mass ratio of ethylene glycol is 21%, and the mass ratio of sulfonated phenolic resin SMP-2 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 polyvinylpyrrolidone K90 is 1.2%, the mass ratio of polyethylene oxide is 1.2%, the mass ratio of propylene glycol phenyl ether is 1.2%, and the rest The component is preparation water.

[0042] The first, second, and third drilling fluid configuration methods in the above-mentioned embodiments are conventional drilling fluid configuration methods, and are evaluated by the following experimental methods:

[0043] 1 Evaluation of drilling fluid shale hydration inhibition

[0044] In the indoor evaluation of the relevant performance of the drilling fluid, the inhibition evaluation experiment is an important p...

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Abstract

The invention discloses complex frozen soil hydrate storage polyvinyl alcohol 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, ethylene glycol, sulfonated phenolic resin SMP-2, potassium polyacrylate, xanthan gum, polyvinylpyrrolidone K90, polyethylene oxide, propylene glycol phenyl ether and prepared water. The drilling fluid can be used for frozen soil layer natural gas hydrate storage drilling, and has the effects of no solid phase and low-temperature resistance. The drilling fluid has higher hydrate generation and inhibition effects by compounding an added kinetic inhibitor with a synergist; in addition, the components of the drilling fluid have little hazard to the environment and have the advantages of high efficiency, environment friendliness, low-priced and easily-obtained raw materials and the like.

Description

technical field [0001] The invention relates to a polyvinyl alcohol drilling fluid for complex frozen soil hydrate storage, in particular to the field of natural gas hydrate exploitation. Background technique [0002] Natural gas hydrates are mainly distributed in deep ocean areas and onshore permafrost areas on continental margins. 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 studies focus on gas hydrates in deep waters of the ocean, and there are relatively few studies on gas hydrates in onshore permafrost regions. Drilling is an essential and important means to explore and develop natural gas hydrates in certain depths of permafrost. The phase-equilibrium nature of gas hydrate determines that drilling in this type of formation is very different from drilling in general oil and gas formations, and also lead...

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 袁鹏飞张晓丽李新
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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