Use of Copper Oxide in water Nano fluid as drilling mud for HPHT high pressure and high temperature wells

Nowadays the production from petroleum reservoirs has a growing trend owing to the increase in global consumption demand. Due to the production fromexisting resources the average drilling depth for reservoirs has increased by 27%. Geothermal gradient and litho static pressure of the overburdenlayers leads to the increase in both temperature and pressure with depth. To control such pressure and also to equilibrate the down hole temperature, thedrilling fluid needs to have optimum viscosity to withstand the formation pressure as well as sufficient heat transfer to cool down the drill bit and drillingstring. In this study, the Nano fluid consisting in Copper Oxide nanoparticles in water is added to the drilling mud structure and the dual fluid theory hasbeen applied with the NRTL model to investigate its properties. Results of the experiment show that such Nano fluid can promote the thermal properties considerably and increase the viscosity of the fluid to a higher extent.