International Journal of Materials Chemistry and Physics Vol. 1, No. 3, 2015, pp. 257-264 http://www.aiscience.org/journal/ijmcp * Corresponding author E-mail address: mf_fche@iauf.ac.ir (F. Farahbod) Parametric Study of Rheological Properties of Novel Composition of Drilling Fluid Amin Shafie 1 , Farshad Farahbod 2, * , Ghassem Zargar 3 1 Department of Petroleum Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran 2 Department of Chemical Engineering, Firoozabad Branch, Islamic Azad University, Firoozabad, Iran 3 Department of Oil Engineering, Petroleum University of Technology, Ahwaz, Iran Abstract The energy of a nation is largely conditioned by the extent of prospective, surveyed and extracted oil and gas reserves and other natural resources. Hence this is the main source of somewhere economy. The oil and gas sector in somewhere has many aspects where it functions; firstly, the confirmation of any natural resources on the earth crust is through drilling. Rheological specifications of drilling mud which contains nano zinc oxide (1gr) in high temperature – high pressure viscometer are considered in this work to simulate the drilling conditions occurred in deep wells. Shear stress versus shear rate is evaluated in this paper. In addition the effect of aging time and temperature on the stability power of drilling mud is considered. Results show the shear stress is decreasing with tha adding the nano particles. Keywords Rheological Specifications, Nano Zinc Oxide, Drilling Mud, Gel Strength, Yield Point, Viscosity Received: August 12, 2015 / Accepted: September 4, 2015 / Published online: September 17, 2015 @ 2015 The Authors. Published by American Institute of Science. This Open Access article is under the CC BY-NC license. http://creativecommons.org/licenses/by-nc/4.0/ 1. Introduction The energy of a nation is largely conditioned by the extent of prospective, surveyed and extracted oil and gas reserves and other natural resources. Hence this is the main source of somewhere economy. The oil and gas sector in somewhere has many aspects where it functions; firstly, the confirmation of any natural resources on the earth crust is through drilling. Drilling is a single important aspect of oil and gas sector for without drilling, there is no access to the natural resources available below the earth crust. Drilling is a process of making a hole in the earths’ surface for the purpose of creating access to the desired resource below the earth crust. Drilling process should be conducted safely least cost and minimum or no damage to the environment [1]. One of the important materials used in drilling is the drilling fluids commonly call drilling mud. The is of two types – water based mud and oil based mud and drilling fluids and design and production of these drilling fluid becomes utmost important because of its role in drilling [2, 3]. Companies involved in the design and production of drilling fluids in somewhere for the oil and gas sector have over the years imported the materials to produce mud or in some cases imported already designed and produced drilling mud. In this case, industry in this sector adjust the properties of the drilling fluid with the aid of the right types of additives which are also imported to suit the formation requirements of the area to be drilled. This has been a major challenge especially to the indigenous companies involved in the oil and gas because they have to import these materials at high costs and this has not allowed them to compete favorably with their foreign counterparts. Research into this area is thus necessary. Country like India, where cheaper substitutes for production of different goods and services are found (including the oil and gas sector and the production of