Method for preparing well-cementing cement briquette of oil well from composite ceramic closed-pore hollow microsphere

A technology of composite ceramics and hollow microspheres, applied in the field of materials, to achieve high activity, improve early strength, and advanced technology

Inactive Publication Date: 2014-06-25
广州盾之构建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008]Due to the gradual reduction of oil and gas resources in low-temperature oil wells on land, the development of low-temperature oil wells on land has gradually shifted from low-temperature oil wells on land to deep land and ocean deep layers. The needs of oil wells require the use of new technologies, new processes, and new materials to meet the requirements of deep high-pressure, high-temperature oil wells. The cement slurry density is 1.0 g / cm3~1.5 g / cm3 between sup>, the hydrostatic pressure resistance strength of composite ceramic microbeads is 200Mpa~300 Mpa

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029](1) Preparation of zirconium diboride, silicon carbide and zirconia composite ceramic closed-pore hollow micro-beads ①Batching and firing: zirconium diboride with a particle size of 1-3 μm, silicon carbide with a particle size of 5-10 μm and a particle size of 1 ~3μm zirconia is mixed in a powder mixer with a weight ratio of 55 wt%: 25 wt%: 20 wt%, stirred evenly, and sintered in a vacuum furnace at 1800°C for 60 minutes, and the sintered body of zirconium diboride, silicon carbide and zirconia Processed into 10 μm microbeads in the spheroidizer, ② Liquid preparation: 10 μm zirconium diboride, silicon carbide and zirconia composite ceramic microbeads 70 wt%: water 30 wt%, add light potassium sulfate foaming agent to the slurry , the concentration is 1g / L, ④ Filtration: remove large particles and impurities, ⑤ Firing: use high-pressure jet high-speed centrifugal rotary spraying method to form microspheres, dehydration and expansion temperature of 800 ° C on a four-zone ele...

Embodiment 2

[0041] (1) Preparation of zirconium diboride, silicon carbide and zirconia composite ceramic closed-pore hollow microbeads ①Batching and firing: Zirconium diboride with a particle size of 4-6 μm, silicon carbide with a particle size of 11-15 μm and silicon carbide with a particle size of 7-10 μm Zirconia was mixed in a powder mixer with a weight ratio of 60 wt%: 25 wt%: 15 wt%, stirred evenly, and sintered in a vacuum furnace at 1900°C for 65 minutes. Zirconium diboride, silicon carbide and zirconia sintered body Processed into 15μm microbeads by chemical machinery, ② Liquid preparation: 15μm zirconium diboride, silicon carbide and zirconia composite ceramic microbeads 75 wt%: water 25wt%, add light potassium sulfate foaming agent to the slurry, the concentration is 2g / L, ④ Filtration: Remove large particles and impurities, ⑤ Firing: Use high-pressure spraying and high-speed centrifugal rotary spraying method to form microspheres. The dehydration expansion temperature is 820°C ...

Embodiment 3

[0053] (1) Preparation of closed-pore hollow microspheres of zirconium diboride, silicon carbide and zirconia composite ceramics ①Batching and firing: zirconium diboride with a particle size of 16 to 20 μm and silicon carbide with a particle size of 4 to 6 μm Zirconia is mixed in a powder mixer with a weight ratio of 70 wt%: 22 wt%: 8wt%, stirred evenly, and sintered in a vacuum furnace at 2000°C for 70 minutes to spheroidize zirconium diboride, silicon carbide and zirconia sintered body Machined into 20 μm microbeads, ② liquid preparation: 20 μm zirconium diboride, silicon carbide and zirconia composite ceramic microbeads 80 wt%: water 20wt%, add light potassium sulfate foaming agent to the slurry, the concentration is 3g / L, ④ Filtration: Remove large particles and impurities, ⑤ Firing: Use high-pressure spraying and high-speed centrifugal rotary spraying method to form microspheres, dehydrate and expand at 850°C in a four-zone electric furnace, and dry and sinter at 1600°C. ...

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Abstract

The invention provides a method for preparing a well-cementing cement briquette of an oil well from a composite ceramic closed-pore hollow microsphere. The method comprises the steps of carrying out preparation on the composite ceramic closed-pore hollow microsphere, dosing, mixing, stirring size-mixing, test mold pouring and strength test, namely in a proportion, mixing 40-50wt% of level-G oil well cement, 10-15wt% of ultra-fine cement, 25-35wt% of the composite ceramic closed-pore hollow microsphere, 5-7wt% of coal ash, 1.5-2wt% of calcium oxide, 0.5-1.0wt% of sodium sulfate and 1-3wt% of micro-silicon, carrying out stirring size-mixing for 40 seconds in a stirring machine in a water cement ratio of 0.5-0.6(W/C), pouring the slurry into a test mold, maintaining for 24 hours and 48 hours in a water bath maintaining tank at a constant temperature of 52 DEG C, demolding, and soaking the product for 1 hour in cold water, and carrying out performance test, wherein the particle size of the ultra-fine cement is 13 microns, the particle size of the composite ceramic closed-pore hollow microsphere is 5-50 microns, the ignition loss of the coal ash is 1.1%, and the purity of the calcium oxide is 9.9%.

Description

technical field [0001] The invention relates to a method for preparing an oil well cementing cement test block by composite ceramic obturator hollow microspheres, belonging to the technical field of materials. Background technique [0002] At present, domestic oil well 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 the pulverized ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B14/02
Inventor 郭志东
Owner 广州盾之构建材有限公司
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