Abstract
In petroleum processes oil and gas wells need to be cased and cemented to ensure the wellbore's stability and to divide trouble zones. To accomplish these tasks and increase the stability of a cement matrix, numerous substances are added to the cement slurry. A two green co-polymers Poly (citric acid-co-ethylene glycol) (PCCE), and Poly (Tartaric acid-co-Glycerol) (PTCG) as a cement retarder was prepared by polycondensation reaction. The prepared co-polymers were characterized by proton nuclear magnetic resonance (H1-NMR), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analysis (TGA). Results showed that all prepared copolymers have excellent thermal stability. PCCE and PTCG copolymer shows a promising thickening time reached to 195 and 175 min compares to free cement -G (110 min) under schedule 5 (sch.5) conditions. This finding indicates the capability of copolymers to use as retarders in oil well cementing.
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