Method for preparing oil well cementing test block resistant to high temperatures and high pressures from aluminum diatomite ceramic microspheres

Abstract

The invention provides a method for preparing an oil well cementing test block resistant to high temperatures and high pressures from aluminum diatomite ceramic microspheres. The method comprises the preparation of aluminum diatomite closed-pore hollow ceramic microspheres, burdening, blending and stirring for slurry mixing. Specifically, the method comprises the steps that 55-65wt% of G-grade oil-well cement, 25-35wt% of aluminum diatomite closed-pore hollow ceramic microspheres having the particle size of 10-50 microns, 5-7wt% of coal ash having the ignition loss of 1.1% and the particle size of 20-50 microns, 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 having the particle size of 5-20 microns are mixed to obtain a mixture; the mixture is mixed with water in the water cement ratio of 0.5-0.7 to obtain the slurry; one part of the slurry is poured into a group of two test molds which are 53mm long, 53mm wide and 53mm high, and maintained in a constant-temperature water bath curing box at 52 DEG C for 24 hours and 48 hours, respectively; next, the stripped product is soaked in cold water for 1 hour, and then a performance index test is performed.

Description

technical field [0001] The invention relates to a method for preparing a high-temperature and high-pressure oil well cementing test block with aluminum diatomite 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 t...

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Problems solved by technology

[0005] In recent years, due to the influence of haze weather in the north, my country's large and medium-sized thermal power generation adopts environmentally friendly desulfurization technology, and the fly ash does not contain floating beads, causing Due to the tight supply, only small and medium thermal power plants and small boilers supply a small amount of floating beads without desulfurization technology. The shortage of floating beads has caused the price to rise, and the floating beads are impure and mixed with fly ash, which affects the quality of cementing.