| dc.description.abstract | Drilling through the subsurface is a complicated process that frequently results in technical challenges. Understanding and anticipating drilling problems, as well as their causes and planning remedies, are essential for achieving the objective effectively. Pipe sticking, lost circulation, wellbore deviation, pipe failures, borehole instability, mud contamination, formation damage, and hole cleaning are the most prevalent drilling difficulties. To understand the mechanical behavior of the drill string and the wellbore state, and hence to predict and prevent downhole issues, torque, and drag modelling is crucial. In the well-drilling sector, torque and drag have been modelled using the soft string and stiff string methods. This thesis will investigate torque and drag simulations in the wellbore and provide an overview of the Oliasoft WelldesignTM (OWD) software and if it is in range of Equinor’s requirement
Also, the hydraulic module must be taken into consideration for understanding and anticipating challenges while drilling. This thesis will investigate how the Standpipe Pressure (SPP) and Equivalent Circulating Density (ECD) will be affected when drilling in different depths and directions. Finally, the results from OWD will be compared to Wellplan (WP) and real time drilling data to see if OWD can used in the Equinor systems.
The OWD simulation analysis comparing with the WP showed that
• The Oliasoft torque, effective tensions, and hydraulics well design module results are within the acceptable range set by the Equinor.
• One out of the considered eight wells, the buckling limit exhibited about 15.4%deviation from WelllPlanTM software. This thesis therefore suggests Equinor to do further investigation. | |
