Evaluation of the Na-EDTMP/borax system as a non-dispersing, high temperature retarder for oil well cement.

ABSTRACT: For well cementing at temperatures above 120 °C, thermal thinning depicts a major problem, promoting particle sedimentation via decreasing slurry viscosities. This is partly caused by dispersing properties of common high temperature retarder systems and can lead to imperfect zonal isolation, endangering the stability of the wellbore. Counteracting additives tend to start losing their effectiveness at temperatures >140 °C. Other options are often not economically sufficient, increase system complexity or show negative interactions with other additives. Hence, this work presents a comprehensive study on the sodium ethylenediamine tetra(methylene phosphonate) (Na-EDTMP)/borax retarder system, which was found to combine sufficient retardation with low thermal thinning, leading to an enh

SUBMITTER: Staude D 

PROVIDER: S-EPMC11497406 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature