Transition time of cement slurries

Cement-slurry transition time is a term that has been used in the oil industry for many years. During this time, the term has been defined, redefined, and misused to cover a wide range of cementing topics. This has led to numerous misconceptions and confusion as to what transition time really means. For many years, this term has been tied to the term right-angle-set, which relates to the speed at which slurries undergoing continuous shear go from a pumpable to a non-pumpable state. The full-length paper establishes a definition for cement transition time and discusses the misconception of using only gel-strength development to control gas migration.