Alireza nasiri
Majid sajjadian
Mohammad Soleymani
ehsan motlagh

Drilling fluid is a vital element of the drilling process. Any drilling fluid must have common properties that facilitate safe and satisfactory completion of the well. A mainchallenge in developing a water-based fluid for such applications has been to maintain the stability of key fluid properties such as rheology and fluid loss at temperaturesin excess of 130°C. This paper discusses a novel waterbased drilling fluid system with a special additive thatproduces a stable rheology and low fluid loss at temperatures approaching 200°C. The advancements in the science of Nano technologies can play a major role insolving some of the common problems in drilling engineering. Nanoparticles can use in the mud systems to improve the lubricating quality and reduce the troublessuch as stuck drill string in the drilling operation. In this research a water-based fluid system along with nano particles has proven to be a successful combination for suitable filtrate and better rheological behavior