Performance test for air leakage-resisting cell cementing test block prepared by using silica and alumina borax soil ceramic mierobeads for oil well

Abstract

The invention provides a performance test for an air leakage-resisting cell cementing test block prepared by using silica and alumina borax soil ceramic mierobeads for an oil well. The performance test comprises the following steps: mixing 40 to 50 weight percent of G-grade oil well cement, 10 to 15 weight percent of superfine cement, 25 to 35 weight percent of closed pore hollow silica and alumina borax soil ceramic microbeads with the particle size of 50 to 350mu m, 5 to 7 weight percent of fly ash with 1.1 percent of ignition loss, 1.5 to 2 weight percent of calcium oxide with the purity of99.9 percent, 0.5 to 1.0 weight percent of sodium sulfate and 1 to 5 weight percent of silicon powder to obtain a mixture, wherein the sum of the weight percentage of all components is 100 percent; uniformly stirring the mixture and carrying out size mixing according to water cement ratio of 0.5 to 0.7, and then adding an aluminum foaming agent which is 0.2 to 0.5 weight percent of total weight of the mixture, thus obtaining expandable slurry; determining the density and a pH value of the expandable slurry and carrying out a uniformity test, a density change rate test and air leakage-resisting performance test on the expandable slurry.

Description

technical field [0001] The invention relates to a performance test for preparing an oil well leak-proof gas cementing test block prepared by silicon-alumina-borax ceramic microbeads, and belongs to the technical field of materials. Background technique [0002] At present, in oil well cementing at home and abroad, ultra-low density cement is used for high temperature and high pressure oil wells, but fly ash floating beads are used, which have low compressive strength and large density change rate of cement slurry. In addition, the proportion of reducing agents such as fly ash float beads must be controlled within 40%, otherwise, the reducing agent will affect the compressive strength of the cementing cement block, and the reducing agent will be within 40% of the cement block density. At 1.2g / cm 3 Above, it is not feasible to reduce the density of the cement block simply by increasing the proportion of the reducing agent. SUMMARY OF THE INVENTION [0003] The modified sil...

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Problems solved by technology

[0002] At present, in oil well cementing at home and abroad, ultra-low density cement is used for high-temperature and high-pressure oil wells, but fly ash floating beads are used, which has low compressive strength and a large change rate of cement slurry density. After the cement slurry is statically solidified, air leakage, In addition, the proportion of lightening agents such as fly ash floating beads must be controlled within 40%, otherwise, the lightening agent will affect the compressive strength of the cement test block, and the density of the cement test block is less than 40%. at 1.2g / cm 3 Above, it is not feasible to reduce the density of the cement test block only by increasing the proportion of lightening agent

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