High-temperature-resistant microcapsule lubricant, preparation method and application thereof, and water-based drilling fluid

A technology of microcapsules and lubricants, which is applied in the field of drilling fluid lubricants, can solve the problems of easy decomposition, inability to adapt to the high temperature environment in the well, and poor temperature resistance, and achieve uniform heating, excellent thermal conductivity and lubrication performance, and improve load resistance. Effect

Active Publication Date: 2021-10-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the common microcapsule wall material has poor temperature resistance, is easy to decompose under the action of high temperature in the well, and cannot adapt to the high temperature environment in the well, and provides a high temperature resistant microcapsule lubricant and its preparation method and application and water-based drilling fluid

Method used

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  • High-temperature-resistant microcapsule lubricant, preparation method and application thereof, and water-based drilling fluid
  • High-temperature-resistant microcapsule lubricant, preparation method and application thereof, and water-based drilling fluid
  • High-temperature-resistant microcapsule lubricant, preparation method and application thereof, and water-based drilling fluid

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preparation example Construction

[0018] The first aspect of the present invention provides a kind of preparation method of anti-high temperature microcapsule lubricant, this method comprises:

[0019] (1) mixing a prepolymer solution made of formaldehyde and urea with carbon microspheres to obtain a wall material mixture;

[0020] (2) preparing emulsifier, ionic liquid, lubricating oil, extreme pressure antiwear agent and water to obtain compound emulsion;

[0021] (3) In the presence of a curing agent, the wall material mixture and the compound emulsion are reacted under acidic conditions, and the product is left standing, filtered and dried to obtain a high temperature resistant microcapsule lubricant.

[0022] In the present invention, the carbon microspheres prepared by the hydrothermal reaction method are added to the resin prepolymer obtained by in-situ polymerization of formaldehyde and urea, and the modified prepolymer mixed liquid is obtained after ultrasonic dispersion. Under the action of the curi...

Embodiment 1

[0072] (1) Add 100g of glucose to 1L of deionized water, raise the temperature to 90°C, stir until completely dissolved, then transfer the solution to a hydrothermal reaction kettle, after 180°C hydrothermal reaction for 8 hours, let the product stand and cool to room temperature , remove the supernatant, and air-dry the brown precipitate at 100°C for 4 hours to obtain carbon microspheres; the measured average particle size is 317nm;

[0073] (2) Weigh 45g of 40% formaldehyde aqueous solution and 24g of urea into a three-necked flask, heat it in a water bath to 60°C while stirring at 800r / min, add 10% sodium hydroxide solution dropwise to make the pH of the reaction system 9, and continue the reaction for 1h , cooled to room temperature to obtain a transparent and viscous prepolymer solution, add 14g of carbon microspheres, and ultrasonically disperse for 30 minutes to obtain a wall material mixture;

[0074] (3) Weigh 1.97g of Tween-80 and 48g of deionized water into a beaker...

Embodiment 2

[0079] (1) Add 50g of glucose to 1L of deionized water, raise the temperature to 90°C, stir until completely dissolved, then transfer the solution to a hydrothermal reaction kettle, after 240°C hydrothermal reaction for 28 hours, let the product stand and cool to room temperature , remove the supernatant, and air-dry the brown precipitate at 100°C for 4 hours to obtain carbon microspheres; the measured average particle size is 676nm;

[0080] (2) Weigh 45g of 40% formaldehyde aqueous solution and 18g of urea into a three-necked flask, heat it in a water bath to 95°C while stirring at 1600r / min, add 10% sodium hydroxide solution dropwise to make the pH of the reaction system 9, and continue the reaction for 1h , cooled to room temperature to obtain a transparent and viscous prepolymer solution, add 6g of carbon microspheres, and ultrasonically disperse for 30 minutes to obtain a wall material mixture;

[0081] (3) Weigh 3.09g of Tween-80 and 48g of deionized water into a beaker...

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Abstract

The invention relates to the field of oilfield chemistry, and discloses a preparation method of a high-temperature-resistant microcapsule lubricant, which comprises the following steps: (1) mixing a prepolymer solution prepared from formaldehyde and urea with carbon microspheres to obtain a wall material mixed solution; (2) using an emulsifier, an ionic liquid, lubricating oil, an anti-wear reagent at extreme pressure and water to prepare a compound emulsion; and (3) in the presence of a curing agent, carrying out a reaction on the wall material mixed solution and the compound emulsion under an acidic condition, and standing, filtering and drying the product to obtain the high-temperature-resistant microcapsule lubricant. The elastic modulus of the microcapsule lubricant at normal temperature is not lower than 1550 MPa, and the microcapsule lubricant has excellent temperature resistance and can resist the temperature of 150 DEG C; 3% w / v of the microcapsule lubricant is added into water-based drilling fluid base slurry, and the friction coefficient reduction rate of the slurry is greater than 80% after the slurry is subjected to hot rolling at 150 DEG C for 16 hours; and after the microcapsule lubricant is subjected to hot rolling in a high-temperature water phase at 150 DEG C for 16 hours, the mass retention rate is greater than 80%.

Description

technical field [0001] The invention relates to the technical field of drilling fluid lubricants, in particular to a high-temperature-resistant microcapsule lubricant, a preparation method and application thereof, and a water-based drilling fluid. Background technique [0002] The performance of drilling fluid lubricant has a great influence on drilling engineering. During special drilling operations such as extended-reach wells, deep wells, ultra-deep wells, and horizontal drilling, the pulling and rotating of the drill string, the friction between the drilling tool and the drilling fluid, and the friction between the drilling tool and the well wall will cause downhole torque and Friction has increased dramatically. Torque and friction will increase the wear of drilling tools, reduce the service life of drilling tools and affect the efficiency and cost of drilling. Excessive torque and friction will even lead to serious downhole safety accidents such as drill sticking and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/24B01J13/18
CPCC09K8/035C09K8/24B01J13/185C09K2208/34C09K2208/10
Inventor 钟汉毅万远邱正松管颖刘文磊孔祥政王帝黄维安
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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