Amir Hossein Nikoo - PhD candidate, School of Chemical and Petroleum Engineering, Shiraz University, Shiraz, Iran
Laila Mahmoodi - PhD Candidate, Chemical Engineering DepartmentSchool of Chemical and Petroleum Engineering, Shiraz University Shiraz, Iran
Mohammad Reza Malayeri - Professor, Chemical Engineering DepartmentSchool of Chemical and Petroleum Engineering, Shiraz University Shiraz, Iran

It is of the great importance to find the mechanisms through which scale inhibitors (SIs) could mitigate mineral precipitation. Accordingly, the current work puts the brine-brine interactions in the absence and presence of a commercial phosphonate-based SI under examination. To achieve this goal, the ۷-day static tests were carried out at ۳۶۳ K and ۱ atmosphere. Moreover, the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory was utilized to explore the interactions between gypsum particles immersed in the brines of ۳۰۰۰ mg/L and ۶۰۰۰ mg/L of [Ca۲+] while the gypsum-brine surface energy properties play a crucial role. The findings revealed that the SI markedly mitigates the precipitation propensity.

Gypsum; Static test; Precipitation; Scale inhibitor; Surface energy; XDLVO theory