Method for preparing oil well cementing cement briquette with silicon carbide/boron carbide hollow ceramic microbeads

Abstract

The invention provides a method for preparing an oil well cementing cement briquette with silicon carbide / boron carbide hollow ceramic microbeads. The method comprises preparation of silicon carbide / boron carbide closed-pore hollow composite ceramic microbeads, burdening, mixing, stirring and size mixing, mold testing and strength testing. The method is characterized in that 40-50wt% of grade G oil well cement, 10-15wt% of 13-micron superfine cement, 25-35wt% of silicon carbide / boron carbide composite ceramic microbeads having the grain size ranging from 5 to 50 microns, 5-7wt% of fly ash having the loss on ignition of 1.1%, 1.5-2wt% of calcium oxide having the purity of 99.9%, 0.5-1.0wt% of sodium sulfate and 1-3wt% of micro-silicon are stirred in a stirrer in a water cement ratio ranging from 0.5 to 0.7 (W / C) for size mixing for 40 seconds, next, the mixture is poured into a test mold and maintained in a water-bath curing box at a constant temperature of 52 DEG C for 24 hours or 48 hours, and after being demolded, the obtained material is soaked in cold water for 1 hour, and then the properties of the obtained material are tested.

Description

technical field [0001] The invention relates to a method for preparing an oil well cementing cement test block with silicon carbide boron carbide hollow ceramic microspheres, belonging 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 the pulver...

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 24-hour pressure is 30Mpa, and the cement slurry density is 0.7 g / cm3~1.5 g / cm3, composite ceramic microbeads have high temperature resistance, high strength, and oxidation resistance. Boron carbide has ultra-high hardness, second only to diamond and cubic boron carbide, low density, and hydrostatic pressure resistance of 100 ~300 MPa, suitable for deep sea oil well cementing requirements