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Microcapsule for temperature control and self-repairing of well cementation cement environment and preparation method of microcapsule

A cementing and self-repairing technology, which is applied in the direction of microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., can solve the problems of cementing quality decline, damage to the integrity of the cementing cement sheath, blowout accidents, etc., and achieve improvement Mechanical strength, strong cleaning and environmental protection, and the effect of reducing hydration and heating

Active Publication Date: 2022-05-10
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, to slow down the hydration heat release rate of the cement slurry to solve the large amount of hydrate decomposition caused by the release of a large amount of gas intrusion into the cement slurry, resulting in the appearance of a micro-annulus between the well-cemented cement sheath and the well wall. The cementing quality declines when empty, and even the gas continues to erupt upwards, causing blowout accidents
On the other hand, it is to suppress the development of stress cracks at the interface of the cement sheath to solve the problem that formation stress, alternating temperature stress and stress generated during production operations will continuously impact the cement stone, resulting in micro-cracks and pores inside the cement sheath. , the problem of destroying the integrity of the cement sheath

Method used

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  • Microcapsule for temperature control and self-repairing of well cementation cement environment and preparation method of microcapsule
  • Microcapsule for temperature control and self-repairing of well cementation cement environment and preparation method of microcapsule
  • Microcapsule for temperature control and self-repairing of well cementation cement environment and preparation method of microcapsule

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preparation example Construction

[0066] A method for preparing the microcapsules for temperature control and self-repair of the above-mentioned cement sheath, comprising the following steps:

[0067] S1. Mix n-tetradecane, n-hexadecane, and stearic acid in deionized water at a mass ratio of 1:1:(0.1-0.2), and stir at a speed of 500 r / min for 1 hour at a room temperature of 20°C A transparent solution is formed to obtain a phase A solution of the temperature-controlled core material. The amount of alkanes added will affect the range of temperature control.

[0068] S2. Mix E-51 epoxy resin, fumed silica, graphene, and boron trichloride in deionized water at a mass ratio of 1:0.5:1:0.7, and then ultrasonically disperse for 1 hour to form phase B of the self-repairing core material Cloudy liquid.

[0069] S3. Add the prepared self-healing core material phase B turbid solution into the temperature-controlled core material phase A solution, and stir at 200 r / min for 1.5 hours to obtain an emulsion.

[0070] S4,...

Embodiment 1

[0077] This embodiment prepares a cement ring temperature control and self-repairing microcapsule SA-Mic, including the following steps:

[0078] S1. Add a total of 10 g of n-tetradecane, n-hexadecane, and stearic acid with a mass ratio of n:n:0.1n into 150 mL of deionized water, and stir at 500 r / min for 1 h at an ambient temperature of 20 ° C to form a temperature-controlled core material Phase A solution.

[0079] S2. Add 7.5 g of E-51 epoxy resin, fumed silica, graphene, and boron trichloride into 150 mL of deionized water in a mass ratio of 1:0.5:1:0.7 and ultrasonically disperse for 1 hour to form a self-repairing core material Phase B solution.

[0080] S3. Then add the phase B solution of the self-healing core material into the phase A solution of the temperature-controlled core material, and stir at 200 r / min for 1.5 hours to obtain an emulsion.

[0081] S4, the emulsion is transferred to an aqueous solution of sodium dodecylbenzenesulfonate (SDBS) (15mL, the SDBS c...

Embodiment 2

[0091] This embodiment prepares a cement ring temperature control and self-repairing microcapsule SA-Mic, including the following steps:

[0092] S1. Add a total of 10 g of n-tetradecane, n-hexadecane, and stearic acid with a mass ratio of 0.5n:0.5n:0.1n into 150mL of deionized water, and stir at 500r / min for 1h at an ambient temperature of 20°C to form Temperature control core material phase A solution.

[0093]S2. Add E-51 epoxy resin, fumed silica, graphene, and boron trichloride to 150mL deionized water at a mass ratio of 1:0.5:1:0.7 and ultrasonically disperse for 1 hour to form a self-repairing core material phase B solution .

[0094] S3. Add the phase B solution of the self-healing core material into the phase A solution of the temperature-controlled core material, and stir at 200 r / min for 1.5 hours to obtain an emulsion.

[0095] S4. Transfer the emulsion to an aqueous solution of sodium dodecylbenzenesulfonate (SDBS) (10mL, the concentration of SDBS is 31.5g / L) an...

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Abstract

The invention discloses a microcapsule for temperature control and self-repairing of a well cementation cement environment and a preparation method of the microcapsule. The microcapsule comprises a capsule core and two layers of capsule walls wrapping the capsule core; the capsule core comprises a temperature control core material formed by mixing alkane and stearic acid, and a self-repairing core material formed by mixing epoxy resin, fumed silica, graphene and boron trichloride; the inner layer of the capsule wall is made of calcium carbonate, and the outer layer is made of stearic acid.

Description

technical field [0001] The invention relates to the technical field of microcapsule preparation, in particular to a microcapsule for cementing ring temperature control and self-repair and a preparation method thereof. Background technique [0002] The global natural gas hydrate is rich in resources and is regarded as a strategic alternative energy source for future oil. Natural gas hydrates only exist stably in high-pressure and low-temperature environments. [0003] During the cementing process in hydrate formations, there are two main difficulties. On the one hand, under the influence of cement slurry hydration heat release, the ambient temperature around the wellbore rises, which changes the temperature conditions of the surrounding gas hydrate layers, which is easy to A large amount of natural gas hydrate will be decomposed, and a large amount of released gas will invade the cement slurry, resulting in problems such as micro-annulus between the well-cemented cement shea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02C09K8/467
CPCB01J13/02C09K8/467Y02E60/14
Inventor 王韧刘天乐孙金声杨杰屈沅治黄宏军程荣超
Owner BC P INC CHINA NAT PETROLEUM CORP