Method for preparing low-density oil well cement test block by using zirconium diboride ceramic micro-beads

Abstract

The invention provides a method for preparing a low-density oil well cement test block by using zirconium diboride ceramic micro-beads. The method comprises the following steps: preparing zirconium diboride ceramic pore-closed hollow micro-beads, batching, mixing, stirring, starching and performing a mold test and a strength test, uniformly mixing 40wt%-50wt% of G-grade oil well cement, 10wt%-15wt% of superfine cement of which the particle size is 13 micrometers, 25wt%-35wt% of zirconium diboride ceramic pore-closed hollow micro-beads of which the particle size is 5-50 micrometers, 5wt%-7wt% of fly ash of which the loss on ignition is 1.1%, 1.5wt%-2wt% of calcium oxide of which the purity is 99.9%, 0.5wt%-1.0wt% of sodium sulfate and 1wt%-3wt% of micro-silicon and stirring; stirring and starching for 40 seconds in a stirrer by a water-cement ratio of 0.5-0.6 (W / C), pouring into a test mold, maintaining for 24 hours and 48 hours in a water-bath maintenance box at a constant temperature of 52 DEG C, demolding, soaking for 1 hour in cold water and then performing a performance test.

Description

technical field [0001] The invention relates to a method for preparing a low-density oil well cementing cement test block with zirconium diboride ceramic microspheres, and belongs to the field of material technology. 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. 0.5-1% of the total amount of ash, the aluminosilicate glass microspheres are hollow spheres, and the floating beads in the fly ash are when the coal powder is burn...

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 traditional cementing material floating beads cannot meet the needs of deep high-temperature oil wells.