Thermal and Rheological Properties of Drilling Fluids at Low Temperature Range

点击翻译按钮获取中文摘要

The thermal and rheological properties of water-base drilling fluids at low temperature range (-5 to 50 deg.C) expected for the fluid temperature of the offshore drilling at the Nankai Trough have been studied. These physical properties are fundamental data for the drilling simulator and also design factors for a heat exchanger to cool down the drilling fuild.The measurement systems for the rheological and thermal characteristics, such as thermal conductivity and heat capacity, have been set up. The drilling fluid density were varied from 1100 to 2000 kg/mィイD13ィエD1(9.16 to 16.7 ppg) using Barite. Especially, the drilling fluids with high salt concentration were mainly focused in present measurements.Then, the experimental equations against the fluids density for the thermal and rheological properties have been presented in order to estimate the parameters used in the simulations. Furthermore, a simplified estimation for heat transfer rate at casing pipe has been carried out using the measurement data to investigate the effect of the property changes in the casing pipe.