Analyzing and Detection of abnormal pressure using the D exponent method

Usually, the pore pressure which is the fluid pressure inside the pores of the reservoir is the hydrostatic pressure or in other words, the pressure that is exerted by the fluid column of water from the depth of the formation to the sea level. When the impermeable formation (rock) such as shale form as sediments are in compaction, the fluids inside the pores is able to escape and the overlying rock column must be supported, leading to anomalously high formation pressure. The pressure must be described as measured at a specific time because the pressure of the reservoir various with the production of the fluid from the reservoir. The “MYM” Field was selected as a real case to perform the pore pressure and fracture pressure estimation from Metlaoui Group formation. Wells that selected are TT4 and TT5. The D-Exponent was executed by using a drilling program for each well to make an estimation of the formation pore pressure and fracture. Using oil base mud while drilling is not always a solution to the wellbore instability problems without applying adequate mud parameters like what happened in TT5. Also, well planning should incorporate Geomechanics to reduce wellbore instability and lost circulation risk