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High-temperature-resistant carbon nanotube hybrid fracturing fluid and preparation method thereof

A technology of carbon nanotubes and fracturing fluids, which is applied in the direction of chemical instruments and methods, dyeing polymer organic compound treatment, drilling compositions, etc., can solve the problem of increasing application costs, low water dispersion performance, and increasing carbon nanotubes Problems such as water dispersibility, to achieve the effect of increasing water dispersibility, low price, and temperature resistance

Inactive Publication Date: 2021-08-17
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since carbon nanotubes are an inorganic material, pure carbon nanotubes cannot be dispersed in water
The method reported in the literature to increase the water dispersibility of carbon nanotubes is to bring hydroxyl or carboxylic acid groups on the surface of carbon nanotubes through oxidation. This oxidation method is to react to the defects on the surface of carbon nanotubes. Carbon nanotubes There are fewer defects on the surface of the tube, resulting in a limited number of hydroxyl or carboxyl groups on the surface of carbon nanotubes after oxidation, and the water dispersion performance is not high
The enhancement of fracturing fluid performance by carbon nanotubes requires a threshold concentration of carbon nanotubes, otherwise the improvement of fracturing fluid performance is limited, only the method of oxidation, the dispersion concentration of carbon nanotubes is limited
Some documents use the method of coating water-soluble compounds on the surface of carbon nanotubes to increase the water dispersibility of carbon nanotubes, such as CN 109097019A. This method uses expensive silicon-based materials to coat nanomaterials, which will increase application cost

Method used

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  • High-temperature-resistant carbon nanotube hybrid fracturing fluid and preparation method thereof

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Embodiment 1

[0032] This embodiment provides a high temperature resistant carbon nanotube hybrid fracturing fluid, which is prepared by the following steps:

[0033] 5g melon collagen powder, 2g NH 4 Cl, 1g nonionic polyoxyethylene polyoxypropylene block copolymer, 0.8g modified carbon nanotubes, 1g nonionic fluorocarbon, 0.2g NaHCO 3 Mix with 987g of water to get the base fluid, before injecting into the well, add 3g of organoboron crosslinking agent.

Embodiment 2

[0035] This embodiment provides a high temperature resistant carbon nanotube hybrid fracturing fluid, which is prepared by the following steps:

[0036] 4g hydroxypropyl guar gum, 1g KCl, 3g nonionic polyoxyethylene polyoxypropylene block copolymer, 0.5g modified carbon nanotubes, 3g nonionic fluorocarbon, 0.2g NaHCO 3 Mix with 986.3g of water to get the base fluid, before injecting into the well, add 2g of organoboron crosslinking agent.

Embodiment 3

[0038] This embodiment provides a high temperature resistant carbon nanotube hybrid fracturing fluid, which is prepared by the following steps:

[0039] 3g carboxymethyl hydroxypropyl guar gum, 3g NH 4 Cl, 2g nonionic polyoxyethylene polyoxypropylene block copolymer, 0.8g modified carbon nanotubes, 1g nonionic fluorocarbon, 0.2g NaHCO 3 Mix with 986g of water to get the base fluid, before injecting into the well, add 4g of organoboron crosslinking agent.

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Abstract

The invention discloses a high-temperature-resistant carbon nanotube hybrid fracturing fluid and a preparation method thereof. The high-temperature-resistant carbon nanotube hybrid fracturing fluid is prepared from a thickening agent, a cross-linking agent, a cleanup additive, a clay stabilizer, a demulsifying agent, NaHCO3, modified carbon nanotubes and the balance of water, wherein the thickening agent is one or a mixture of more than two of guar gum raw powder, hydroxypropyl guar gum and carboxymethyl hydroxypropyl guar gum; the modified carbon nanotubes are carbon nanotubes coated with water-based acrylic resin. According to the invention, the surface of the carbon nanotubes is coated with the very economical water-based acrylic resin, and the water dispersibility of the carbon nanotubes is greatly improved by the water-soluble water-based acrylic resin so that a temperature-resistant and shear-resistant carbon nanotube hybridized high-temperature fracturing fluid system with low price is obtained.

Description

technical field [0001] The invention relates to the technical field of guar gum fracturing fluid, in particular to a high-temperature-resistant carbon nanotube hybrid fracturing fluid and a preparation method thereof. Background technique [0002] Guar gum fracturing fluid has been widely used in the production stimulation of oilfields. The existing fracturing fluid system can basically meet the needs of major domestic reservoirs. However, with the development of exploration and development, deeper and deeper wells are being developed. Along with this, the temperature at the bottom of the well is getting higher and higher. At the same time, the shearing time of the fluid is longer during construction, so higher requirements are put forward for the performance of the fracturing fluid. [0003] In order to improve the temperature resistance of fracturing fluid, people have developed a high-temperature-resistant thickener, so that the main chain of the thickener can remain stab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/90C09K8/88C09K8/86C09C1/44C09C3/10
CPCC09K8/685C09K8/665C09K8/845C09K8/905C09K8/882C09K8/86C09C1/44C09C3/10
Inventor 管保山王世彬许可郭建春王海燕刘萍邱晓惠王丽伟石阳徐敏杰
Owner PETROCHINA CO LTD