Wellbore instability problems significantly increase the cost of drilling and operations in the o... more Wellbore instability problems significantly increase the cost of drilling and operations in the oil and gas industry. These problems can occur in a variety of forms including stuck pipe, loss circulation, hole enlargement, unintentionally induced tensile fractures or difficult directional control incidents. In this research, we investigate the wellbore instability issues in Field "X", a mature oil and gas sandstone reservoir located in North Sumatra, Indonesia. An integrated wellbore-stability study was implemented to help avoid wellbore instability problems in this field. To narrow down the possible causes of wellbore instabilities in this field, a problemdiagnostic scheme was done by analyzing well log data, drilling reports, mud logging reports, and pore pressure measurements. The availability of data is the main problem in developing a good geomechanical model. Numerous methods for data acquisition were discussed in this study to gather reliable geomechanics data as inputs for the model, especially log based methods. Geomechanics model was coupled with mechanical stress, temperature alteration, chemical iteration effects, and flow induced stress using Mohr-Coulomb and Mogi-Coulomb failure criteria. A numerical model was built using MATLAB programming software that results in the critical mud weight to avoid wellbore breakout and tensile failure in arbitrary wellbore inclination and azimuth.
Wellbore instability problems significantly increase the cost of drilling and operations in the o... more Wellbore instability problems significantly increase the cost of drilling and operations in the oil and gas industry. These problems can occur in a variety of forms including stuck pipe, loss circulation, hole enlargement, unintentionally induced tensile fractures or difficult directional control incidents. In this research, we investigate the wellbore instability issues in Field "X", a mature oil and gas sandstone reservoir located in North Sumatra, Indonesia. An integrated wellbore-stability study was implemented to help avoid wellbore instability problems in this field. To narrow down the possible causes of wellbore instabilities in this field, a problemdiagnostic scheme was done by analyzing well log data, drilling reports, mud logging reports, and pore pressure measurements. The availability of data is the main problem in developing a good geomechanical model. Numerous methods for data acquisition were discussed in this study to gather reliable geomechanics data as inputs for the model, especially log based methods. Geomechanics model was coupled with mechanical stress, temperature alteration, chemical iteration effects, and flow induced stress using Mohr-Coulomb and Mogi-Coulomb failure criteria. A numerical model was built using MATLAB programming software that results in the critical mud weight to avoid wellbore breakout and tensile failure in arbitrary wellbore inclination and azimuth.
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Papers by Aidil Adham