Nano-plugging agent modified ketal, preparation method thereof and oilfield drilling fluid

A nano-sealing agent and oilfield drilling technology, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problem of effective sealing of nano-scale micro-fractures, inability to effectively block and prevent collapse, poor plugging effect, etc. problems, achieve the effect of preventing collapse, stabilizing well wall and improving mud cake

Inactive Publication Date: 2019-11-08
北京培康佳业技术发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the conventional plugging agents are modified asphalt, including sulfonated asphalt and emulsified asphalt. The particle size of these asphalt plugging agents is mostly in the micron level or above. Plugging, when the initial nano-scale micro-cracks cannot be plugged in time, the micro-cracks will grow and grow and cause the formation strength to deteriorate. collapse

Method used

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  • Nano-plugging agent modified ketal, preparation method thereof and oilfield drilling fluid
  • Nano-plugging agent modified ketal, preparation method thereof and oilfield drilling fluid
  • Nano-plugging agent modified ketal, preparation method thereof and oilfield drilling fluid

Examples

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Effect test

Embodiment 1

[0026] Take 30 parts of industrial superior grade absolute ethanol according to the weight ratio and add it to the reaction kettle, add 10 parts of industrial superior grade ethyl acetoacetate ethylene glycol ketal, 12 parts of industrial superior grade sodium chloroacetate, 3 parts of industrial High-grade sodium hydroxide, 25 parts of water, slowly heat up to 90°C, react for 3 hours, then add 5 parts of disodium hydrogen phosphate, raise the temperature to 95°C, and keep stirring at 95°C for 3 hours, cool , that is to obtain the nano-blocking agent modified ketal of this embodiment.

Embodiment 2

[0028] Take 32 parts of industrial superior grade absolute ethanol according to the weight ratio and add it to the reaction kettle, add 18 parts of industrial superior grade ethyl acetoacetate ethylene glycol ketal, 12 parts of industrial superior grade sodium chloroacetate, 3 parts of industrial High-grade sodium hydroxide, 30 parts of water, slowly heat up to 90°C, react for 3 hours, then add 5 parts of disodium hydrogen phosphate, raise the temperature to 95°C, and keep stirring at 95°C for 3.5 hours, cool , that is to obtain the nano-blocking agent modified ketal of this embodiment.

Embodiment 3

[0030] Take 32 parts of industrial superior grade anhydrous ethanol according to the weight ratio and add it to the reaction kettle, add 18 parts of industrial superior grade ethyl acetoacetate ethylene glycol ketal, 12 parts of industrial superior grade sodium chloroacetate, 4 parts of industrial High-grade sodium hydroxide, 35 parts of water, slowly heat up to 90°C, react for 3 hours, then add 6 parts of disodium hydrogen phosphate, raise the temperature to 92°C, and keep stirring at 92°C for 4 hours, cool , that is to obtain the nano-blocking agent modified ketal of this embodiment.

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Abstract

The invention discloses a nano-plugging agent modified ketal, a preparation method thereof and an oilfield drilling fluid. The nano-plugging agent modified ketal with a nanoscale particle size is obtained by: subjecting ethyl acetoacetate ethylene glycol ketal, sodium chloroacetate and sodium hydroxide to hydroxymethylation reaction, and then performing cross-linking by a cross-linking agent. Thepreparation method is simple, the reaction process does not need nitrogen protection, and after adding the raw materials for reaction, the obtained product can be cooled directly without heating or drying. With good fluidity, the nano-plugging agent modified ketal has significant effect of plugging stratum microcracks, especially nano-microcracks, and after being added into oilfield drilling fluid, can effectively improve mud cake, stabilize the well wall and prevent collapse.

Description

technical field [0001] The invention relates to the technical field of oilfield drilling fluid materials, in particular to a nano-blocking agent modified ketal NAX50 for oilfield drilling fluid and the prepared oilfield drilling fluid. Background technique [0002] In the face of increasingly complex geological conditions in the process of oil and gas exploration and development, higher requirements are put forward for the stability of the well wall. The transfer effect in the micro-fractures causes the development of fractures, which makes the stability of the wellbore wall worse, and in severe cases, it leads to drilling accidents such as wellbore collapse. Therefore, it is necessary to add a plugging agent to the drilling fluid to improve the quality of the mud cake, plug the formation micro-fractures, and stabilize the borehole wall. Formation micro-cracks often start from nano-scale micro-cracks and develop under the action of physical and chemical factors such as hydr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/32C08G79/04C07F9/09B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C07F9/09C08G79/04C09K8/32C09K2208/10C09K2208/12
Inventor 姚少全
Owner 北京培康佳业技术发展有限公司
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