INFLUENCE OF A COMPLEX POLYFUNCTIONAL ADDITIVE ON THE PROPERTIES OF OIL-WELL CEMENT

Abstract

oil-well cement, finesses of cement, polycarboxylate superplasticizer, cellulose ether, free water separation, spreading, thickening time to a consistency 30 Bc.

The article describes studies of effectiveness adding polyfunctional additive of polycarboxylate superplasticizer and cellulose ethers during grinding process of oil-well cement. Were obtained polynomial models that allow determining the influence of cement composition additives on water separation, spreading, as well as the corresponding thickening time and strength. Were shown the influence of introduction combinations of a polycarboxylate superplasticizer and cellulose ether on the main normalized parameters. Were obtained results that allow reducing water separation without affecting spreading, thickening time and strength. With adding 0.05% of a polycarboxylate superplasticizer and 0.02% of cellulose ether during grinding of oil-well cement is observed a decrease in water separation from 8.5 ml to 0.2 ml while maintaining the required plasticity of the cement paste with a spreading of 250 mm. In addition, another parameter like thickening time and flexural strength are at the sufficient level, not less than 3,5 MPa. But during adding polycarboxylate superplasticizer and cellulose ether as in composition and as separately observing decrease in flexural and compressive strength for about 1-1,5 MPa. Increased specific surface area and superplasticizer has a positive effect on the strength index and increases it by 3 MPa. Also the combination of cellulose ether content and superplasticizer has a negative effect on the compressive strength at the age of 28 days and decreases it by 3.5 MPa. Superplasticizer has a significant positive effect for spreading and for water consumption. Any dosage of superplasticizer and cellulose ether does not reduce the thickening time of cement paste to the critical value of 90 min. This study opens up a possible way to control the sedimentation process and allow to get oil-well cement paste without any free water separation and in compliance with all other regulatory requirements.

1. 1. О. І. Кротюк, Л.Й. Дворкін № 48 (2025). ЕФЕКТИВНІСТЬ ВВЕДЕННЯ ПРИ ПОМЕЛІ ТАМПОНАЖНОГО ЦЕМЕНТУ ЕФІРУ ЦЕЛЮЛОЗИ. Ресурсоекономні матеріали, конструкції, будівлі та споруди. Рівне, Україна. https://doi.org/10.31713/budres.v0i48.08

   I. Krotiuk, L.Y. Dvorkin № 48 (2025). EFEKTYVNISTʹ VVEDENNYA PRY POMELI TAMPONAZHNOHO TSEMENTU EFIRU TSELYULOZY. Resursoekonomichni materialy, konstruktsiyi, budivnytstva ta sporudy. Rivne, Ukrayina. https://doi.org/10.31713/budres.v0i48.08

   2. ДЕРЖАВНИЙ СТАНДАРТ УКРАЇНИ. Будівельні матеріали. ПОРТЛАДЦЕМЕНТИ ТАМПОНАЖНІ. МЕТОДИ ВИПРОБУВАНЬ. ДСТУ Б В.2.7-86-99. Державний комітет будівництва, архітектури та житлової політики України. - Київ, 1999.

   DERZHAVNYY STANDART UKRAYINY. Budivelʹni materialy. PORTLADTSEMENTY TAMPONAZHNI. METODY VYPROBUVANʹ. DSTU B V.2.7-86-99. Derzhavnyy komitet budivnytstva, arkhitektury ta zhytlovoyi polityky Ukrayiny. - Kyyiv, 1999.

   3. ДЕРЖАВНИЙ СТАНДАРТ УКРАЇНИ. Будівельні матеріали. ПОРТЛАДЦЕМЕНТИ ТАМПОНАЖНІ. Технічні умови. ДСТУ Б В.2.7-88-99. Державний комітет будівництва, архітектури та житлової політики України. - Київ, 1999.

   DERZHAVNYY STANDART UKRAYINY. Budivelʹni materialy. PORTLADTSEMENTY TAMPONAZHNI. Tekhnichni umovy. DSTU B V.2.7-88-99. Derzhavnyy komitet budivnytstva, arkhitektury ta zhytlovoyi polityky Ukrayiny. - Kyyiv, 1999.

   4. Дворкін Л. Й. Експериментально-статистичне моделювання при проектуванні складів бетонів : навчальний посібник / Л. Й. Дворкін. – К.: Видавничий дім «Кондор», 2020. – 205 с.

   Dvorkin L. Y. Eksperymentalʹno-statystychne modelyuvannya pry proektuvanni skladiv betoniv : navchalʹnyy posibnyk / L. Y. Dvorkin. – K.: Vydavnychyy dim «Kondor», 2020. – 205 s.