A kind of oil well cement defoamer, preparation method and application

Abstract

The invention discloses an oil-well cement antifoamer, a preparation method and application. The antifoamer is prepared from the following raw material ingredients: 70-80 parts of polyether, 0.1-1 part of long-carbon-chain acid, 10-20 parts of mixture paste of methyl silicone oil and hydrophobic white carbon black, 5-10 parts of antifoaming monomer and 0.5-1.5 parts of stabilizer, wherein the antifoaming monomer is tributyl phosphate, n-octanol or isooctanol; and the stabilizer is polypropylene glycol, polyacrylamide or white oil. The antifoamer disclosed by the invention has excellent properties in the aspects of inhibiting foam of mortar preparing water and eliminating foam from cement mortar, is low in dosage and is efficient, and the properties of the cement mortar are not affected, sothat the antifoamer has a broad popularization and application prospect.

Description

technical field [0001] The invention relates to the technical field of drilling, and more particularly relates to an oil well cement defoamer, a preparation method and an application. Background technique [0002] In order to meet the needs of cementing construction and improve the performance of cement slurry, about 1-5% of admixtures will be added to the water, including: PVA fluid loss reducer, styrene-butadiene latex, styrene-acrylic polymer emulsion, high-efficiency isolation flushing fluid, etc. These solutions containing polymers and surfactants produce a large number of air bubbles during water distribution and ash mixing; the generation of air bubbles can reduce the density of cement slurry by more than 20%; at the same time, the fluidity of cement slurry decreases, and the pump It is also difficult to send; it will also have an adverse effect on the thickening performance of the cement slurry; during the waiting period of the cement slurry, too many air bubbles wil...

AI Technical Summary

Problems solved by technology

However, the active ingredients of domestic defoamers are too low, the dosage is relatively large, and the function is relatively single, and the defoaming ability under high temperature, strong acid and alkali conditions is limited.

[0004] During the cementing process, the bubbles are mainly generated during the preparation of the ground on site. When the slurry water and cement ash are mixed, coupled with high-speed centrifugal stirring, the foam is very obvious, and the density of the cement slurry can be reduced from 1.90 to 1.70g / cm 3 Left and right, too much foam will overflow the batch mixing tank, which will have adverse effects on water supply, injection replacement, and even cementing construction. The problem of poor foaming ability, good foreign products are expensive, and the use of defoamers is restricted by others

Therefore, a new type of high-efficiency and multi-purpose defoamer for oil well cement was designed and synthesized to solve the problems of foam suppression in mixing water and mixing and defoaming of cement slurry in the process of cement slurry preparation in the petroleum engineering well cementing field.

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