A novel and efficient epoxy/chitosan cement slurry for use in severe acidic environments of oil wells—Structural characterization and kinetic modeling

Chitosan: Emergence as potent candidate for green adhesive market

“…The newly formed cement slurry was able to conserve its crystalline property after long-term contact with HCl aqueous solution whereas standard cement exhibited drastic decrease in crystalline pattern after reaction with HCl. Improved property of modified epoxy: chitosan cement slurry offered its increased application as environmentalfriendly acidizing polymer in oil wells [54].…”

Chemical degradation of reinforced epoxy‐cement composites under CO2‐rich environments

“…Addition of polymers to cement paste can be considered an alternate method to reduce the effects of the carbonation process, since literature reports improvements in mechanical and chemical properties of cement‐based materials containing polymeric admixtures . Epoxy resins are a class of thermoset materials widely used as polymer composite matrices because of their high mechanical and adhesion characteristics, effective electrical insulation, chemical and solvent resistance, relatively low shrinkage during curing, low toxicity and cost as well as ease in processing .…”

Epoxy resin‐cement paste composite for wellbores: Evaluation of chemical degradation fostered carbon dioxide

“…Therefore, the amount of hydration products, the hydrate crystals morphology and the microstructure of cement paste are modified. It is related to the partial intercalation of the polymer chains within the cement hydration products and interactions obtained by hydrogen bonds between the resin and these products ,. Moreover, bulk density of cement tends to decrease by increasing epoxy resin content according to the mixing rule of the present phases (polymer and cement) .…”

“…In contrast, a large number of unconnected pores in cement is observed in absence of epoxy resin. The interaction between the resin and portlandite can result in large aggregate formation which might reduce porosity . Therefore, the presence of resin can bind cement hydrate phases, fill large pores, decrease pathways for crack propagation and enhance strength of cement …”

“…14 Addition of polymers into cementitious materials greatly improves their strength, adhesion, impermeability, chemical resistance, and durability properties. [21][22][23][24][25][26] It is known that the presence of a polymeric phase can reduce porosity of the cement matrix with consequent decrease of pathways for crack propagation, enhancing its strength. 27 Epoxy-urethane acryl polymers can offer improved properties like high strength to abrasion, flexibility, and good resistance.…”