A kind of urea modified carbon nanotube cement slurry and preparation method thereof

A technology of cementing cement slurry and modified carbon, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of limited reaction yield, many reaction steps, complicated process, etc., and achieve the reduction of steps and mechanical properties Reinforcement, strong hydrophobic effect

Active Publication Date: 2021-09-21
SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, on the one hand, this method needs to carry out acyl chlorination of carboxyl carbon nanotubes, and then use glycine to modify them. There are many reaction steps and the reaction yield is limited; on the other hand, this method needs to use sodium bicarbonate aqueous solution to quench the reaction. , more raw materials, complex process

Method used

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  • A kind of urea modified carbon nanotube cement slurry and preparation method thereof
  • A kind of urea modified carbon nanotube cement slurry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of urea modified carbon nanotube:

[0026] (1) Take 1 part of carbon nanotubes, add 10 parts of concentrated sulfuric acid and 30 parts of nitric acid in sequence, and mix to obtain solution A; ultrasonically treat solution A at 140-150°C for 3 hours, and then use 20% hydrogen peroxide The aqueous solution was treated for 2-3 hours, centrifuged, washed with distilled water until neutral, suction filtered and dried to obtain solid S;

[0027] (2) Add 20 parts of acetonitrile and 1.2 parts of EDCI sequentially to the solid S obtained in step (1) to obtain a mixed solution B;

[0028] (3) Add 1.2 parts of urea and 2 parts of triethylamine to the mixed solution B obtained in step (2), stir at room temperature for 2 hours, filter, remove the solvent by rotary evaporation, recover the black solid at the bottom, rinse with deionized water, drying to obtain urea-modified carbon nanotubes.

Embodiment 2

[0030] The preparation method of urea modified carbon nanotube is the same as embodiment 1;

[0031] A urea-modified carbon nanotube cementing slurry, which is composed of the following raw materials in parts by weight: 100 parts of oil well cement, 1.5 parts of fluid loss reducer, 0.02 part of urea-modified carbon nanotube, 0.1 part of defoamer and 44 parts of clear water share;

[0032] The oil well cement is grade G oil well cement;

[0033] The fluid loss reducing agent is cellulose derivatives, specifically but not limited to carboxymethyl cellulose, hydroxyethyl cellulose or carboxymethyl hydroxyethyl cellulose;

[0034] The main component of the defoamer is polyethylene glycol;

[0035] A preparation method of urea modified carbon nanotube cement slurry, comprising the following steps:

[0036] (1) Mix oil well cement and fluid loss reducer to obtain solid mixture A;

[0037] (2) Take clean water, urea-modified carbon nanotubes and defoamer, mix them, and ultrasonic...

Embodiment 3

[0040] The preparation method of urea modified carbon nanotube is the same as embodiment 1;

[0041] A urea-modified carbon nanotube cementing slurry, which is composed of the following raw materials in parts by weight: 100 parts of oil well cement, 1 part of fluid loss reducer, 0.04 part of urea-modified carbon nanotube, 0.2 part of defoamer and 44 parts of clear water share;

[0042] The oil well cement is grade G oil well cement;

[0043] The fluid loss reducing agent is cellulose derivatives, specifically but not limited to carboxymethyl cellulose, hydroxyethyl cellulose or carboxymethyl hydroxyethyl cellulose;

[0044] The main component of the defoamer is tributyl phosphate;

[0045] A preparation method of urea-modified carbon nanotube cement slurry is the same as that in Example 2.

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Abstract

The invention discloses a urea-modified carbon nanotube cementing cement slurry, which is composed of the following raw materials in parts by weight: 100 parts of oil well cement, 1-2 parts of fluid loss reducer, 0.02-0.15 parts of urea-modified carbon nanotubes, 0.05-0.2 parts of foaming agent and 44 parts of clear water; urea-modified carbon nanotubes are prepared by the following method: get 1 part of carbon nanotubes, add 10 parts of concentrated sulfuric acid and 30 parts of nitric acid, mix to obtain solution A; Ultrasonic treatment at 150°C for 3 hours, treatment with 20% aqueous hydrogen peroxide solution for 2-3 hours, centrifugation, washing with distilled water until neutral, suction filtration, drying to obtain solid S; add 20 parts of acetonitrile and 1.2 parts of EDCI to obtain a mixed solution B; add 1.2 parts of urea and 2 parts of triethylamine to the mixed solution B in sequence, stir at room temperature for 2 hours, filter, remove the solvent by rotary evaporation, recover the bottom black solid, rinse with deionized water, and dry , you can. The dispersibility of urea-modified carbon nanotubes in the cementing cement slurry is used to improve the mechanical properties of the carbon nanotube cementing slurry.

Description

technical field [0001] The invention belongs to the technical field of cementing cement slurry, and in particular relates to a urea-modified carbon nanotube cementing slurry and a preparation method thereof. Background technique [0002] In recent years, in view of the rapid development of nano-materials, the use of nano-materials to improve the performance of cement stone is a research hotspot in the field of academia and cementing engineering. Carbon nanotubes are one-dimensional materials with high modulus and high strength. The diameter is generally several nanometers to tens of nanometers, the thickness of the tube wall is only a few nanometers, and the length can reach several microns. Research and practice have proved that carbon nanotubes can improve the mechanical properties of cement cement, but due to their relatively large length and diameter, entanglement between tubes is very easy to occur, which affects its effect. Therefore, for carbon nanotube cement slurry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/12C04B28/02C09K8/487
CPCC04B28/02C04B40/0039C04B2111/00724C04B2201/50C09K8/487C04B22/141C04B22/085C04B22/068C04B14/026C04B24/124C04B24/12C04B24/126C04B24/121C04B24/383C04B24/28C04B24/003C04B24/32
Inventor 倪军王涛窦倩王仙仙于小龙
Owner SHAANXI YANCHANG PETROLEUM GRP
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