[01] Mohammad Iranparast, Department of Chemical Engineering, Sirjan Branch, Islamic Azad University, Sirjan, Iran. [02] Farshad Farahbod, Department of Chemical Engineering, Firoozabad Branch, Islamic Azad University, Firoozabad, Iran.

The objective of designing drilling fluid for extreme and deep environment (HPHT wells) is to develop high performance drilling fluid system in well bore to achieve zonal isolation. The primary objective of drilling fluid is to improve thermo electrical and rheological properties and displacement efficiency of drilling fluid system. The experimental results show the filtration number is decreased from 0.2 to 0.1, approximately when the thickness is changed from 1 to 2 centi meters. In addition according to the standard the thermal penetration is investigated in the different thickness of drilling fluid. The obtained results show, the increasing in the amount of nano particle increases the amount of viscosity of slurry. Also, it seems each extra 0.2% nano oxide increases the viscosity about 0.2 Pa.s from 0.2% to 0.6%. The basic parameters which are effective in determination of drilling fluid performance are evaluated in this study, finally.

Electrical Conductivity, Thermal Conductivity, Thermal Penetration, Drilling Fluid Additives, High Performance Drilling Fluid System, Rheology, Ferric Oxide Nano Particle

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