Temperature Regime of Boreholes: Cementing of Production Liners

Abstract

The effect of the borehole temperature recovery process (disturbed by drilling operations) affects the technology of the casing cementing operations. The design of cement slurries becomes more critical when a casing liner is used because the performance requirements should be simultaneously satisfied at the top and at the bottom of the liner. For this reasons it is logical to assume that the bottomhole shut-in temperature should be considered as parameter in the cement slurry design. In deep wells the actual downhole temperature during cement setting may significantly differ from the mud circulating or from the formation (undisturbed) temperatures. In this paper we suggest two methods (an empirical equation and the equivalent “API Wellbore” method). An early developed relationship can be used to determine the shut-in temperatures. A field example is presented to demonstrate the calculation procedure.