Testing method for performance of oil well anti-air-leakage well cementation test block prepared through silicon bauxite ceramic microbeads

Abstract

The invention provides a testing method for the performance of an oil well anti-air-leakage well cementation test block prepared through silicon bauxite ceramic microbeads. The method comprises the steps that 40-50wt% of G-level oil well cement, 10-15wt% of superfine cement, 25-35wt% of blind hole hollow silicon kaolin ceramic microbeads with the particle size of 50-250 microns, 5-7wt% of coal ashwith the ignition loss of 1.1%, 1.5-2wt% of calcium oxide with the purity of 99.9%, 0.5-1.0wt% of sodium sulfate and 1-5wt% of silicon powder are mixed to obtain a mixed material, the sum of the weight percentage of the components above is 100%, and the mixed material is evenly stirred into thick liquid according to a water-cement ratio of 0.5-0.7; then an aluminum foaming agent with the weight as 0.2-0.5% of total weight of the mixed material is added to the mixture, expansion grout is prepared, and measurement of the density and PH value of the expansion grout, homogeneity testing, testingof the density change rate and testing of the anti-air-leakage performance are conducted.

Description

technical field [0001] The invention relates to a test method for preparing an oil well anti-leakage gas cementing test block by silica-alumina ceramic microbeads, belonging 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 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. Contents of the i...

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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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