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Silicon slurry and preparation method thereof

A technology of silicon slurry and micro-silica fume, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of gelation of silicon slurry, unsatisfactory results, and inability to recover gels, etc.

Active Publication Date: 2012-07-25
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] During the preparation of silicon paste, it was found that the use of the above-mentioned dispersants or additives to prepare silicon paste still has the phenomenon of gelation in the long-term storage of the silicon paste, and even produces unrecoverable gel, which affects the use; and the use of silicon powder surface treatment method to improve the stability of silicon paste, but the process is relatively complicated and satisfactory results cannot be obtained

Method used

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  • Silicon slurry and preparation method thereof
  • Silicon slurry and preparation method thereof

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Embodiment 1

[0036] Put the slurry cup filled with deionized water on a high-speed stirrer, slowly add microsilica powder at a speed of 4000rpm, and stir at a speed of 12000rpm for several minutes to obtain a viscous slurry. Auxiliary composition, 1000rpm low-speed stirring to get the silicon slurry. According to the formula in Table 1, it can be prepared that the solid content is 55.6% (A slurry), 62.5% (C slurry) and the silicon slurry with a solid content of 55.6% and antifreeze (B slurry). From the performance evaluation results shown in Table 1 below, it can be seen that the silicon paste prepared by the present invention has the characteristics of long-term storage stability. Neither the silicon paste (D paste) prepared by the method disclosed in US5176752 patent nor the silicon paste (E paste) prepared by the method disclosed in JP2002137947 patent can meet the requirements of long-term storage stability.

[0037] Table 1 Silicon paste prepared according to each formula and its per...

Embodiment 2

[0041] In the cementing slurry, the performance difference between microsilica powder in the form of powder and silicon slurry in the form of its aqueous solution was measured, and the comparison results are shown in Table 2. As can be seen from Table 2, there is no significant difference between the silicon slurry prepared by the present invention and the microsilica fume in powder form on the cement slurry performance, and for well cementing construction, it is not only convenient to use silicon slurry, Moreover, it is beneficial to the personal protection of the user because no dust phenomenon will be generated. It can also be seen from Table 2 that both silicon slurry or microsilica fume thicken the cement slurry, and when the polycarboxylic acid dispersant PC-F45L is used, the rheological properties of the cement slurry are better than those of the sulfonated aldehyde-ketone condensation dispersant PC-F40L .

[0042] Table 2 1.95S.G cement slurry formula and performance ...

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Abstract

The invention relates to a silicon slurry which is prepared from micro silica powder, polycarboxylic acid dispersant, deionized water and related auxiliaries. The weight of the polycarboxylic acid dispersant is 0.3-0.45% of that of the micro silica powder, and the weight of the deionized water is 60-100% of that of the micro silica powder. The silicon slurry has the advantages of high solid content, low viscosity and storage stability. The invention also relates to a preparation method of the silicon slurry.

Description

technical field [0001] The invention relates to a silicon slurry and a preparation method thereof, in particular to a silicon slurry suitable for oil field cementing cement slurry and a preparation method thereof. Background technique [0002] Micro silica fume (also known as silica fume, English name Microsilica or silica fume), is amorphous silica powder collected by flue dust collector when smelting ferrosilicon alloy or metal silicon, and its particle size is 0.15-0.20 μm, the specific surface area is 15000~25000m 2 / kg. On the one hand, the particle size of micro silica fume is one percent of that of cement, which has a good physical filling effect; on the other hand, micro silica fume reacts with calcium hydroxide produced in the cement hydration process to produce a strong cement Glue (CSH), increase the strength of cement stone, this process is called pozzolanic effect. The physical filling effect and pozzolanic effect of silica fume can increase the compactness, ...

Claims

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Application Information

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IPC IPC(8): C09K8/467
Inventor 符军放张浩冯克满赵琥王永松王云庆
Owner CHINA NAT OFFSHORE OIL CORP
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