Drilling in geothermal wells is always the most expensive part of operation. Also, we know when go deep in layers, we always can absorb more heat and energy. This case can make some part of operation more expensive to go from shallow geothermal reservoirs to deep geothermal reservoirs. Managed pressure drilling (MPD) is an effective solution to obviate the drilling problems of narrow drilling window between the pore and fracture pressure, such as well kick and loss and well collapse and stuck. The Constant Bottom Hole Pressure (CBHP) technique, one of the MPD variants, was selected to freeze bottom hole pressure in narrow area between pore and fracture pressure as a safe method to drill without loss and gain. In this paper tried to control the ECD in upper sections to be able to drill in narrow drilling margin. Drilling window between collapse and fracture pressure is normally closed due to geological reasons, which in turn leads to creation of a boundary at which the dynamic formation losses could not be properly controlled.


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