Performance test of oil well anti-gas leakage well cementing test block prepared by alumina-silica bentonite ceramic microbeads
A technology of ceramic microbeads and bentonite, which is applied in the field of performance testing of oil well anti-leakage cementing test blocks prepared by materials, silicon-alumina bentonite ceramic microbeads, and can solve the problems of large change rate of cement slurry density, low compressive strength, leaky wells, etc. problem, achieve the effect of reducing pressure, reducing density and improving compression resistance
Inactive Publication Date: 2018-03-30
ZIBO VOCATIONAL INST
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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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Embodiment 1
[0030] The performance test of the oil well anti-leakage gas cementing test block prepared by silicon-aluminum bentonite ceramic microbeads includes the following steps:
[0031] A. Preparation of silica-alumina bentonite closed-cell hollow ceramic microspheres:
[0032] The first step, the preparation of the base material: the particle size of 25 µm silicon aluminum bentonite powder, particle size of 40 µm silica powder, 30 µm alumina powder according to the weight ratio: 70wt%: 15wt%: 15wt% sampling to obtain the mixed powder;
[0033] The second step, the modified firing of the base material: After the first step is mixed and stirred evenly, add 5wt% of the total weight of the mixed powder and reduce the resin, stir evenly in the mixer, and press it into a billet with a compactor, at 150 ° C Dry for 10 hours, heat-preserve and fire in a reduction electric furnace at 1500°C for 4 hours, and obtain a modified silicon-aluminum bentonite ceramic block through a replacement reac...
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Abstract
The invention provides a performance test of an oil well anti-gas leakage well cementing test block prepared by alumina-silica bentonite ceramic microbeads. The oil well anti-gas leakage well cementing test block is prepared from the following components in percentage by weight: 40 to 50wt% of G-grade oil well cement, 10 to 15wt% of superfine cement, 25 to 35wt% of closed-pore hollow alumina-silica bentonite ceramic microbeads with particle size of 50 to 250mu m, 5 to 7wt% of fly ash with burn loss of 1.1%, 1.5 to 2wt% of calcium oxide with purity of 99.9%, 0.5 to 1.0wt% of sodium sulfate, and1 to 5wt% of silicon powder, so as to obtain a mixture, wherein the sum of the percentages of the components by weight is 100%; the mixture is uniformly stirred, pulped according to a water-cement ratio of 0.5 to 0.7; adding an aluminum foaming agent, so as to obtain the expanded slurry, wherein the weight of aluminum foaming agent is equal to 0.2 to 0.5% of total weight of mixture; density and pH (potential of hydrogen) determination, homogeneity test, density change test and anti-gas leakage performance test of the expanded slurry are performed.
Description
technical field [0001] The invention relates to performance testing of an oil well anti-leakage gas cementing test block prepared by silicon-aluminum bentonite ceramic microbeads, and belongs to the field of material technology. 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. ...
Claims
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IPC IPC(8): G01N33/38G01N1/38
Inventor 冯青
Owner ZIBO VOCATIONAL INST