SU1553652A1 - Plugging composition - Google Patents

Abstract

The invention relates to the drilling of wells. The goal is to improve the thermal insulation properties of the stone while simultaneously increasing the pumping period of the solution. The solution contains components in a ratio, by weight. %: Portland cement 26.1 - 56.3

lightening additive 6.2 - 17.3

sulphite-yeast brew modified with higher fatty alcohols from C ₈ to C ₁₆ 0.02 - 0.20

shutter fluid. Clay powder, vermicullate, etc. are used as a facilitating additive. Water and an aqueous solution of salts are used as a mixing fluid. The grouting solution is prepared by mixing the dry mixture with a solution of a modified mash. 1 tab.

Description

The invention relates to the production of cement slurries of low density and can be used in the cementing of oil and gas wells.

The aim of the invention is to improve the thermal insulation properties of the stone while simultaneously increasing the pumping period of the solution.

The cement slurry contains components in a ratio, wt.%: Portland cement 26.1-56.3; facilitating additive 6.2-17.3; sulphite-yeast brew modified with higher fat0 {-C I

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A modified sulphite-yeast brew is prepared in a special mixer by mixing the sulphite-brewing liquid concentrate with higher fatty alcohols or bottoms from their production. One of the reactions resulting from this process is the formation of an ester according to the scheme

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Example. The preparation of tampon solutions was carried out by mixing a homogenized mixture of Portland cement and facilitating the addition of pre-prepared mixing liquid with plasticizers dissolved in it. Dissolution of the plasticizer in the mixing fluid was carried out in a mill-stringer for a period of t min. The test results are shown in the table.

These tables indicate that a reduced density cement slurry with an optimal content of components has the best properties, namely: the period of solution hardening increased by 50-60%; 30% reduced thermal conductivity coefficient of stones.

, When the content of components is below the lower limit, the strength of the cement stone is reduced, and when they are contained above the upper limit, the pumpability period is reduced and the heat insulating properties of the cement stone deteriorate.

I Advantages of low density cement slurry in the aggregate

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promote quality improvement

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operation and reliability during well operation.

Claims (1)

Invention Formula Cement slurry, including Portland cement, which facilitates the addition, modified technical lignosulfonate and closure fluid, which, in order to improve the thermal insulation properties of the stone while increasing the pumping period of the solution, it contains sulfite-yeast mash modified by higher fatty alcohols fractions from Cg to Јff in the following ratio, wt.%: Portland cement 26.1-56.3 Lightening additive6, 2-17.3 Sulphite-yeast brew, s modified by the higher fatty spheres of the fractions from C9 to C, 6 0.02-0.20 Closure fluid Else