Developing a new approach for the anticipation of subsurface pressure in three oil wells from various fields in Iraq

Abstract Subsurface pressure quantification is the main goal for all drilling engineers due to its vital importance minimizing costs and preventing various excavating dilemmas such as stuck pipe, pipe collapsing, lost circulation, well kick. Formation measured directly in producing hydrocarbon zones using special equipment; however, it difficult obtain pore measurements other intervals; therefore, many approaches were suggested developed anticipate geopressure on operation. Traditionally, Eaton's method most widely used anticipation from logs. In current study, a new proposed formula determination was derived modified equation which based inception of mechanical specific energy. The study applied three oil-producing wells different fields Iraq (Missan C, West Qurna 15, Zubair 171). estimated subsurface approach validated by comparison with actual situ obtained Drill Stem Test (DST) Repeated (RFT). Statistical analysis validation applying Mean squared error ( MSE ) Absolute percentage Error MAE ). Encouraging results present research being studied. finding work involving parameter (mechanical energy) determination, where not included previous techniques equations. It found that value exponent m has significant influence predicted geopressure, varies 0.1626 0.6896 depending type excavated rock plus materials drill bit manufactured of, interaction between these components vital. could be useful when planning excavate adjacent area investigated wells, logs are unavailable measurement suitable usage mud weight highly needed overall process.