Ultra-high temperature suspending stabilizer and cement slurry interface interaction law and mechanism study for ultra-deep well cementing

Abstract

The high temperature issue that cementing is facing is getting more and more significant as oil and gas extraction is being expanded to deep stratum. In order to increase the sedimentation stability of cement slurry under ultra-high temperature conditions, a suspension stability of cement slurry was created in the study. On the basis of previous research, its mechanism of action was examined from the perspective of interface interaction. The suspension stabilizer's low temperature adsorption behavior was investigated using the Zeta potential test and the total organic carbon (TOC) test. The findings indicate that the suspension stabilizer's apparent adsorption activation energy is 44.667 kJ/mol, which is in the range of chemical adsorption. The XRD test, infrared spectrum test, and Raman spectrum test were used to examine the cement's hydration byproducts. The findings demonstrate that hydrated calcium silicate (C-S-H) is the predominant component of the cement paste's short-term hydration products during ultra-high temperature curing. Ion concentration testing and molecular dynamics modeling were used to examine the interface interaction mechanism between the suspension stabilizer and the hydration products. The findings indicated that a network of chemical interactions, including hydrogen and ionic bonds, interacted between suspension stabilizer and C-S-H. The sedimentation stability of cement slurry is maintained by the persistence of these chemical linkages at extremely high temperatures.