Method for preparing low-density oil well cementing cement block employing zirconia ceramic composite microspheres

Abstract

The invention provides a method for preparing a low-density oil well cementing cement block employing zirconia ceramic composite microspheres. The method comprises the following steps: preparing zirconia ceramic composite closed hollow microspheres; preparing materials, mixing, agitating and mixing slurry; testing a mold, and testing the strength; evenly mixing and agitating 40-50wt% of G-grade oil well cement, 10-15wt% of superfine cement of 13mu m, 25-35wtt% of zirconia ceramic composite closed hollow microspheres of which the particle sizes are 5-50mu m, 5-7wt% of coal ash of which the ignition loss is 1.1%, 1.5-2wt% of calcium oxide of which the purity is 99.9%, 0.5-1.0wt% of sodium sulfate, and 1-3wt% of micro-silicon; agitating and mixing inside an agitator at the water-cement ratio of 0.5-0.6 (W/C) for 40 seconds; pouring to test the mold; maintaining inside a water bath maintenance case at constant temperature of 52 DEG C for 24 hours and 48 hours; and soaking in cold water for an hour after demolding, and carrying out 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 zirconia ceramic composite 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.