Real Time Integration of ECD, Temperature, Well Stability and Geo/Pore Pressure Simulations during drilling a challenging HPHT well

2010 ◽  
Author(s):  
Rolv Rommetveit ◽  
Knut Steinar Bjorkevoll ◽  
Pierre Rolf Cerasi ◽  
Stein Tjelta Havardstein ◽  
Mikkel Fjeldheim ◽  
...  
Keyword(s):  
Real Time ◽  
Pore Pressure ◽  
Time Integration

scholarly journals Real-Time Integration of MDCT-Derived Coronary Anatomy and Epicardial Fat

2013 ◽  
Vol 6 (1) ◽  
pp. 42-52 ◽  
Author(s):  
Carine F. van Huls van Taxis ◽  
Adrianus P. Wijnmaalen ◽  
Sebastiaan R. Piers ◽  
Rob J. van der Geest ◽  
Martin J. Schalij ◽  
...  
Keyword(s):  
Real Time ◽  
Time Integration ◽  
Epicardial Fat ◽  
Coronary Anatomy

Overcoming Hole Instability in Highly Deviated Wells in the Kafr El Sheikh Shale, Offshore Mediterranean, Egypt

2021 ◽  
Author(s):  
Yasser Kholaif ◽  
Mahmoud Elmaghraby ◽  
Annick Nago ◽  
Jean-Michel Embry ◽  
Pramit Basu ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Lower Bound ◽  
Real Time ◽  
Pore Pressure ◽  
Nile Delta ◽  
Stress Sensitivity ◽  
Rock Properties ◽  
Well Drilling ◽  
Geomechanical Monitoring ◽  
Deviated Wells

Abstract Drilling challenges in offshore Nile Delta have been largely documented in the literature. Operators are often confronted with drilling problems related to shale swelling, cavings, tight holes in combination with increased risks of lost circulation in some of the highly depleted formations. The Kafr El Sheikh shale in particular, has been linked to many instances of wellbore instability, due to its mineralogical composition (estimated to be mostly smectite, >70%). From offset well drilling experience, it could also be noticed that insufficient mud weight was often used to drill through the Kafr El Sheikh Shale, causing wellbore failure in shear due to lack of support of the wellbore wall. In the past, multiple mud weight designs have been implemented relying solely on pore pressure as lower bound of the mud window. With the increased use of geomechanics, it has been demonstrated that the lower bound should be taken as the maximum of the pore pressure and borehole collapse pressure, thus accounting for the effects of formation pressure, horizontal and vertical stresses, rock properties as well as wellbore trajectory. It has been proven that slight overpressure is often encountered halfway through the Kafr El Sheikh formation, which would typically result in slightly higher borehole collapse pressures. In the study fields, the operator expressed interest in drilling highly deviated wells (> 60-70 degrees). This raised concerns for increased drilling challenges, especially in the Kafr El Sheikh. A comprehensive and systematic risk assessment, design of a fit-for-purpose solution and its implementation during drilling took place in the fields of interest. Offset well data analytics from the subject fields supported a holistic evaluation of drilling risks associated with the Kafr El Sheikh, providing good understanding of stress sensitivity on deviation, azimuth and lithology. Upon building a robust geomechanical model, calibrated against offset well drilling experience, pre-drill mud weight and drilling practices recommendations were provided to optimize the drilling program. Near real-time geomechanical monitoring was implemented which helped to manage the model uncertainties. The implementation of a holistic risk assessment, including geomechanical recommendations and near real-time geomechanical monitoring, was effective to lead the drilling campaign successfully. As a result, three high angle wells (> 60-70 degrees) were drilled through the challenging Kafr El Sheikh formation without any hole instability. An integrated risk assessment of hole instability, managed in stages (pre-drill and during drilling), has helped to understand and simulate the behaviors of the formation. Proactive decisions have established a controlled drilling environment for successful operations.

Sign in / Sign up

Export Citation Format

Share Document