Rheological Compatibility of a Hardening Spacer Fluid and Oil-Based Drilling Fluid

Summary In the placement process of cement slurry, treatment fluids such as spacer are pumped ahead cementitious slurry to minimize contamination by drilling fluid and ensure superior bonding casing formation. The discussed in this work can harden with time act a settable spacer. This characteristic be an advantage for well integrity if some pockets left annulus. Rheological compatibility different mixtures oil-based (OBDF) has been studied using rheometer, resulting R-factor, which indicates degree between fluids, calculated. An increase flow curve was observed mixture fluids. However, based on R-index, these compatible displacement wellbore. A nonionic surfactant, typically used conventional spacers acting emulsifier water-wetting agent, hardening design. results show that addition OBDF containing surfactant viscoelasticity. Hardening successfully reverse emulsion. By performing small-scale mud experiment, we improve wall cleaning efficiency while having minimal impact bulk displacement.