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Method for preparing low-density cement testing block for oil well cementation by using tantalum carbide microbeads

A cement test block and oil well cementing technology, which is applied in the field of materials to achieve the effects of low production cost, advanced technology and stable product performance

Inactive Publication Date: 2013-11-27
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In recent years, due to the influence of smog weather, my country's large and medium-sized thermal power generation adopts environmentally friendly desulfurization technology, and the fly ash does not contain floating beads, resulting in tight supply

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of tantalum carbide closed-cell hollow microspheres ① Preparation: Mix tantalum oxide with a particle size of 1-10 μm and phenolic resin in a weight ratio of 1:0.8 to form a mixed powder in a mixer, solidify at a temperature of 40°C, and then make Form 50 μm powder, briquette the 50 μm mixed powder on a 1Mpa briquetting machine, sinter in an electric furnace at 1300 degrees for 5 hours to obtain a tantalum carbide block, and make the blocky tantalum carbide into a 5 μm round solid microsphere on a spheroidizer. ② Dosing: The weight percent composition of tantalum carbide slurry is: 60 wt% tantalum carbide with a particle size of 5 μm, 40 wt% water, and a foaming agent is added to the tantalum carbide slurry, which is light calcium carbonate at a concentration of 1g / L. ③ Stirring: put the tantalum carbide solution with a good ratio into the stirrer and stir evenly; ④ Filtration: remove large particles and impurities; After dehydration expansion, sintering...

Embodiment 2

[0031] (1) Preparation of tantalum carbide closed-cell hollow microspheres ① Preparation: Mix tantalum oxide with a particle size of 10-20 μm and phenolic resin in a weight ratio of 1:0.9 to form a mixed powder in a mixer, solidify at a temperature of 70°C, and then make into 70μm powder, briquetting the 70μm mixed powder on a 2Mpa briquetting machine, sintering in an electric furnace at 1500°C for 6 hours to obtain a tantalum carbide block, and making the blocky tantalum carbide into a 20μm round solid microsphere on a spheroidizer . ②Liquor preparation: The weight percentage composition of tantalum carbide slurry is: 65 wt% tantalum carbide with a particle size of 20 μm, and 35 wt% water. Add foaming agent potassium sulfate to the tantalum carbide slurry at a concentration of 2g / L. ③Stir : Put the tantalum carbide solution with a good ratio into the stirrer and stir evenly; ④ Filtration: remove large particles and impurities; Expansion, sintering, melting, balling, and grad...

Embodiment 3

[0040] (1) Preparation of tantalum carbide closed-cell hollow microspheres ① Preparation: Mix tantalum oxide with a particle size of 20-30 μm and phenolic resin in a weight ratio of 1:1 to form a mixed powder in a mixer, solidify at a temperature of 100°C, and then make into 100μm powder, briquetting the 100μm mixed powder on a 3Mpa briquetting machine, sintering in an electric furnace at 1800°C for 8 hours to obtain a tantalum carbide block, and making the blocky tantalum carbide into a 30μm round solid microsphere on a spheroidizer . ②Liquid preparation: The weight percent composition of tantalum carbide slurry is: 70 wt% tantalum carbide with a particle size of 30 μm, and 40 wt% water. Add foaming agent sodium sulfate to the tantalum carbide slurry at a concentration of 3g / L. ③Stir: Put the tantalum carbide solution with a good ratio into the stirrer and stir evenly; ④ Filtration: remove large particles and impurities; , sintering, melting, balling, and grading to obtain 1...

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Abstract

The invention provides a method for preparing a low-density cement testing block for oil well cementation by using closed hollow tantalum carbide microbeads. The method comprises the following steps of: preparing the hollow tantalum carbide microbeads; burdening; mixing; stirring and slurrying; mold testing; and carrying out a strength test. The method is characterized by comprising the following steps of: stirring and slurrying 55wt% to 65wt% (weight percentage) of G-grade oil well cement, 25wt% to 35wt% of the closed hollow tantalum carbide microbeads with the particle diameter from 10 to 150 mu m, 5wt% to 7wt% of coal ash with the ignition loss being 1.1%, 1.5wt% to 2wt% of calcium oxide with the purity being 99.9%, 0.5wt% to 1.0wt% of sodium sulfate and 1wt% to 3wt% of micro-silicon in a stirrer for 40 seconds according to the water-cement ratio being from 0.5 to 0.7 (W / C); pouring the mixture into a group of testing molds (comprising the two testing molds respectively having 53mm, 53mm and 53mm in length, width and height); maintaining the testing molds in a water bath maintenance box for 24 hours and 48 hours at the constant temperature of 52 DEG C; demolding and soaking in cold water for 1 hour; and then performing the strength test.

Description

technical field [0001] The invention relates to a method for preparing a low-density oil well cementing cement test block by using tantalum carbide closed-pore hollow microspheres, and belongs to the field of material technology. Background technique [0002] At present, the domestic cementing lightening agent uses floating beads in fly ash, including sinking beads and floating beads in fly ash, and the density of sinking beads is 1.1-2.8g / cm 3 , between, and the content accounts for 30-70% of fly ash. Floating beads are glass beads in fly ash that are less dense than water. Floating beads mainly include aluminosilicate glass beads and porous carbon particles. Floating beads after removing carbon particles It mainly includes thin-walled aluminosilicate glass beads with smooth inner and outer surfaces and large volume. 0.5 to 1% of the total ash, and the aluminosilicate glass microspheres are hollow spheres. [0003] Among them, the floating beads in the fly ash are when th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B14/32
Inventor 郭志东郭春瑶
Owner SHANDONG UNIV OF TECH
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