Retarding Mechanisms of Sulfonated Lignin Nanoparticles for Oilwell Cement Slurries at High-Temperature Conditions
Oilwell cementing in high-temperature, high-salinity reservoirs requires retarders capable of maintaining slurry stability, pumpability, and favorable rheological performance under severe downhole conditions. Conventional retarders, including sodium gluconate (SG) and sodium borate (SB), often suffer from thermal deg...