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A preparation method of microcapsules for controlling cement hydration heat for low temperature well cementing

A technology of cement hydration and microcapsules, which is applied in the direction of microcapsule preparation and microsphere preparation, can solve the problems of low phase transition temperature, insensitive temperature response, and high phase transition point temperature of paraffin wax materials, and achieve good compatibility, Reduce the discharge of heat of hydration to the outside and realize the effect of large-scale production

Active Publication Date: 2022-04-22
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microcapsules prepared with binary composite phase change material as the core material and activated silica as the shell material have good compatibility with cement slurry, stable structure and low phase transition temperature, and can be used in low temperature cementing cement system. It solves the problem that the phase transition temperature of paraffin wax materials is too high and the temperature response is not sensitive enough, and has broad market application prospects

Method used

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  • A preparation method of microcapsules for controlling cement hydration heat for low temperature well cementing
  • A preparation method of microcapsules for controlling cement hydration heat for low temperature well cementing
  • A preparation method of microcapsules for controlling cement hydration heat for low temperature well cementing

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Experimental program
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Effect test

Embodiment 1

[0034] Weigh 10 g of sodium silicate, add it into 50 mL of deionized water at 45°C and stir magnetically for 10 min to dissolve it completely. Add 5g lauryl alcohol and 5g n-capric acid mixed solution, 0.05g CTBA and 0.05g OP-10 into a three-necked flask, keep heating in a water bath at 45°C, stir with a stirrer at a speed of 2000rpm for 30min, so that lauryl alcohol and n-capric acid are evenly dispersed And form an oil-in-water (O / W) emulsion, and add hydrochloric acid to adjust the pH value to 1.5. Transfer the above emulsion to a 50°C constant temperature water bath, and at the same time, add the prepared sodium silicate solution dropwise into the three-necked flask with a separatory funnel, and stir at a speed of 300rpm for 2h, then transfer the product to a beaker to naturally Cool to room temperature, filter with suction, wash with absolute ethanol and deionized water, and freeze-dry.

Embodiment 2

[0036]Weigh 12g of sodium silicate, add it into 80mL of deionized water at 45°C and stir magnetically for 10min to dissolve it completely. Add 6g of lauryl alcohol and 6g of n-capric acid mixed solution, 0.03g of CTBA and 0.07g of OP-10 into a three-necked flask, keep heating in a water bath at 45°C, stir with a stirrer at a speed of 2000rpm for 30min, so that lauryl alcohol and n-capric acid are evenly dispersed And form an oil-in-water (O / W) emulsion, and add hydrochloric acid to adjust the pH value to 2. The above emulsion was transferred to a 60°C constant temperature water bath, and at the same time, the prepared sodium silicate solution was added dropwise into the three-neck flask with a separatory funnel, and stirred at a speed of 500rpm for 2h, and then the product was transferred to a beaker and naturally Cool to room temperature, filter with suction, wash with absolute ethanol and deionized water, and freeze-dry.

Embodiment 3

[0038] Weigh 15g of sodium silicate, add it into 50mL of deionized water at 45°C and stir magnetically for 10min to dissolve it completely. Add 7g lauryl alcohol and 7g n-capric acid mixed solution, 0.02g CTBA and 0.08g OP-10 into a three-necked flask, keep heating in a water bath at 45°C, stir with a stirrer at a speed of 2000rpm for 30min, so that lauryl alcohol and n-capric acid are evenly dispersed And form an oil-in-water (O / W) emulsion, and add hydrochloric acid to adjust the pH value to 2.5. Transfer the above emulsion to a 70°C constant temperature water bath, and at the same time, add the prepared sodium silicate solution dropwise into the three-necked flask with a separatory funnel, and stir at a speed of 600rpm for 2.5h, and then transfer the product into a beaker Naturally cooled to room temperature, suction filtered, washed with absolute ethanol and deionized water, and freeze-dried.

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Abstract

The invention relates to a preparation method of microcapsules for controlling cement hydration heat for low-temperature well cementing, comprising: (1) Weighing 10-20g of shell material, adding it to 50-100mL deionized water, and placing it in a constant temperature water bath at 45°C Stir in the pot to dissolve into a uniform and stable shell material solution; (2) Add 10-20g of core material and 0.02-0.1g of emulsifier into a three-necked flask and stir in a constant temperature water bath at 45°C to make it even Emulsify and disperse to form a stable oil-in-water core material emulsion, and at the same time adjust the pH value of the emulsion to be lower than 5.5; (3) Transfer the three-neck flask containing the core material emulsion to a water bath at 50-90°C, stir and drop by drop Add the shell material solution, pour it out after reacting for 2-3 hours, filter the cooled solid-liquid mixture with suction, wash with ethanol and deionized water respectively to remove impurities, and finally freeze-dry. The microcapsules prepared by the invention have good compatibility with cement slurry, stable structure and low phase transition temperature, can be used in low-temperature well cementing cement systems, and have broad market application prospects.

Description

technical field [0001] The invention relates to the field of oil and gas field development and cementing, in particular to a preparation method of microcapsules for controlling the heat of hydration of cement for low-temperature cementing, which is suitable for controlling the heat of hydration of low-temperature early-strength cement slurry in cement slurry systems under low-temperature conditions . Background technique [0002] With the rapid development of my country's petroleum industry, it is becoming more and more difficult to exploit oil and gas resources. The development of oil and gas resources in deep water, ultra-deep water and even extremely cold regions has become an inevitable trend and an important strategy for my country's petroleum industry. It has been proven that the geological reserves of oil in the South China Sea are 20 billion tons, and the natural gas reserves are about 40 trillion cubic meters, accounting for 1 / 3 of my country's total resources, of w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/32B01J13/02
CPCC04B40/0046B01J13/02C04B12/04C04B24/085C04B24/08C04B24/121C04B24/32C09K5/06B01J13/206C04B28/02C04B20/1074C04B2103/0089C09K8/467C04B2103/0071B01J13/043C04B20/0004
Inventor 张春梅蔡靖轩王佳程小伟刘开强王平徐豪代碧波柯曝阳郭小阳
Owner SOUTHWEST PETROLEUM UNIV
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