Cement paste temperature control self-repairing microcapsule and preparation method thereof

A microcapsule and self-healing technology, which is applied in the direction of microcapsule preparation and microsphere preparation, can solve the problems of cementing quality decline, damaged layers, blowout accidents, etc., to improve mechanical strength, simple manufacturing process, and improve safety performance Effect

Inactive Publication Date: 2021-04-13
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the deep ocean surface layer is close to the hydrate formation, there are two main difficulties in the cementing process. On the one hand, under the influence of the hydration heat release of the cement slurry, the ambient temperature of the wellbore rises, which changes the surrounding hydration. The temperature condition of the layer will easily cause a large amount of hydrate to decompose, and the released large amount of gas will invade the cement slurry, resulting in problems such as micro-annulus between the well-cemented cement sheath and the well wall and other problems of cementing quality degradation, and The gas continuously erupts upwards, leading to blowout accidents, serious local subsidence, or even destruction of the entire layer, forming a vicious circle, causing all surrounding hydrates to decompose, and finally leading to a series of problems such as cementing failure.

Method used

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  • Cement paste temperature control self-repairing microcapsule and preparation method thereof
  • Cement paste temperature control self-repairing microcapsule and preparation method thereof
  • Cement paste temperature control self-repairing microcapsule and preparation method thereof

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preparation example Construction

[0043] The present invention also provides a preparation method of the microcapsules for temperature-controlled self-repair of cement slurry, comprising the following steps:

[0044] Step S1, take the sliced ​​paraffin and mix it with any proportion of low-carbon paraffin, heat it in a water bath to 55-65°C, and stir it with a magnetic stirrer until the paraffin-paraffin mixture dissolves into a transparent state; the proportion of low-carbon paraffin determines the control of the microcapsules. temperature range; among them, the carbon chain number of the main component of paraffin wax is between 18 and 30, and the carbon chain number of the main component of low-carbon paraffin is below 18, and its general formula is C n h 2n+2 , wherein, 5≤n<18; low-carbon paraffins can be any one or more of pentane, hexane...heptadecane;

[0045]Step S2, adding sodium dodecylbenzenesulfonate to the liquid in step S1, and fully stirring with a magnetic stirrer at a temperature of 55-65°C t...

Embodiment 1

[0053] Take 5g of sliced ​​paraffin and 2.5g of low-carbon paraffins and mix them in a beaker, heat in a water bath to 60°C, stir with a magnetic stirrer at low speed until the paraffin paraffin mixture dissolves into a transparent state; add 0.15g of dodecane to the transparent liquid Sodium phenyl sulfonate, and fully stirred and emulsified with a magnetic stirrer at a speed of 400r / min at a temperature of 60°C to obtain a core material solution; weigh 3.75g of calcium chloride powder, stir and dissolve in deionized water, and prepare Calcium chloride solution with a solute mass fraction of 20%; slowly add the calcium chloride solution dropwise to the core material solution, and stir at a speed of 350r / min with a magnetic stirrer while heating in a water bath at a temperature of 60°C 1h, obtain the first mixed solution; Take 2.25g sodium carbonate powder and dissolve in deionized water, prepare sodium carbonate solution, add 0.75gE-51 epoxy resin and ethanol to the sodium car...

Embodiment 2

[0058] Take 5g of sliced ​​paraffin and 5g of low-carbon paraffin and mix them in a beaker, heat in a water bath to 58°C, and stir at a low speed with a magnetic stirrer until the paraffin and paraffin mixture dissolves into a transparent state; add 0.15g of dodecyl to the transparent liquid Sodium benzenesulfonate, and fully stirred and emulsified with a magnetic stirrer at a speed of 500r / min for 30min at a temperature of 58°C to obtain a core material solution; weigh 4.5g of calcium chloride powder, stir and dissolve in deionized water, and prepare Calcium chloride solution with a solute mass fraction of 20%; slowly add the calcium chloride solution dropwise to the core material solution, and stir at a speed of 350r / min with a magnetic stirrer while heating in a water bath at a temperature of 58°C 1h, obtain the first mixed solution; Take by weighing 3.5g sodium carbonate powder and dissolve in deionized water, prepare sodium carbonate solution, add 0.8gE-51 epoxy resin and ...

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Abstract

The invention provides a cement paste temperature control self-repairing microcapsule which is of a spherical particle structure, the microcapsule comprises a capsule core and a capsule wall wrapping the capsule core, the capsule core and the capsule wall are bonded through an adhesive layer, the adhesive layer is made of epoxy resin, the capsule core is made of a paraffin and alkane mixture, and the capsule wall is made of calcium carbonate. The invention further provides a preparation method of the cement paste temperature control self-repairing microcapsule. The cement paste temperature control self-repairing microcapsule prepared by the invention is simple in preparation process, can be industrially produced in batches, and is high in cleanness and environmental friendliness in the production process.

Description

technical field [0001] The invention relates to the technical field of microcapsule preparation, in particular to a microcapsule for temperature-controlled self-repair of cement slurry and a preparation method thereof. Background technique [0002] Oil and gas mainly occur in deep sea areas. Therefore, more and more attention has been paid to the research and development of deepwater oil drilling and completion technology. In recent years, although the deep-water cementing technology has made great progress, there are still many problems to be solved urgently in the deep-water cementing technology for the hydrate layer. [0003] Because natural gas hydrates only exist stably in high-pressure and low-temperature environments. When the deep ocean surface layer is close to the hydrate formation, there are two main difficulties in the cementing process. On the one hand, under the influence of the hydration heat release of the cement slurry, the ambient temperature of the wellb...

Claims

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Application Information

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IPC IPC(8): C04B24/42B01J13/02
CPCB01J13/02C04B40/0039C04B24/36C04B24/281C04B22/10C04B24/42
Inventor 杨国坤刘天乐蒋国盛郑少军覃鑫
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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