A novel hydrophobically associating water-soluble polymer used as constant rheology agent for cement slurry

Abstract

During the process of well cementing in deep water, the cement slurry experiences a wide range of temperature variation from low temperature at seabed to high temperature in downhole. The elevated temperature affects the rheology of cement slurry. The change of rheology of cement slurry could influence the safety of cementing operation. The aim of this paper is to develop a new kind of hydrophobically associating water-soluble polymer (NHAWP) as an additive to prepare a constant rheology oil well cement slurry, which can be used at temperature range from 4°C to 90°C. The acrylamide, 2-acrylamide-2-methylpropionic acid and stearyl methylacrylate were applied to synthesize the NHAWP by the inverse microemulsion polymerization. Test results indicate that the critical association temperature of NHAWP is 45°C. The critical association temperature is independent of NHAWP concentration, salt concentration and alkalinity of solution. When the temperature is below 45°C, NHAWP shows little influence on the viscosity of solution. When the temperature is above 45°C, the NHAWP forms spatial network structure by intermolecular hydrophobic association and thus increases the viscosity of solution significantly. The NHAWP also displays good thermal stability and excellent salt and alkali resistance properties. In addition, the NHAWP shows nearly no negative influence on the basic properties of cement slurry, which indicates that the NHAWP can be used as a constant rheology agent to prepare a cement slurry with constant rheology in the temperature range of 4°C to 90°C.

Application of anticorrosive materials in cement slurry: Progress and prospect

“…Frontiers in Materials frontiersin.org (thixotropic agent, constant rheology agent, etc.) to significantly improve the toughness of cement paste and improve the cementing performance between the cementing cement sheath and the first and second interface layers (Guo et al, 2020;Bu et al, 2022). Chen et al (2011) used self-developed water-soluble linear crosslinked polymer (FH) as an anti-corrosion additive and used FH to undergo a polycondensation reaction with acid to form a network membrane structure, thus preventing the corrosion of acid and alkali substances.…”

Preparation and performance evaluation of non-foaming styrene-acrylic latex for cementing slurry

“…Well cementing is a process in which a casing is inserted into an oil and gas well and a cement slurry is injected into the annulus between the casing and formation [1][2][3]. The cementing quality of the oil and gas well is related not only to the safe and efficient production of the oil and gas well but also its service life, which is extremely important for the development of the oil and gas field.…”