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Integration of Engineering & Geomechanics Lead to a Successful Sidetrack, Drilling, and Completion


 A landing section of a well in newly developed area of a field had three challenges: the well trajectory cuts through shale intervals at high inclination; the well plan was limited to a certain trajectory window where weak bedding planes failure could not be ruled out by changing the plan; the previous section's casing was short landed due to wellbore instability challenges. An effort to initiate a sidetrack twice was not successful due to wellbore collapse, therefore a new sidetrack depth had to be identified. Geomechanics group collaborated with Drilling Engineering, and Drilling fluid services to successfully initiate the sidetrack, drill the well and land the liner casing safely to bottom.
 A geomechanics model was built based on wireline logging data from offset wells. First, stress azimuth was constrained from oriented multi arm caliper of multiple wells around the field. Then, rock properties were derived from acoustic logging data, and the model was calibrated against drilling events and caliper enlargements. Finally, Geomechanical and petrophysical parameters were utilized to design fluids parameters and additives. A starting mud weight window was defined, and a sidetrack point was selected in strong rock interval. The well was monitored in real time where Logging while drilling, acoustic caliper, and azimuthal density image were utilized for breakouts onset monitoring. Furthermore, drilling parameters were monitored for hole cleaning and mud weight control.
 The stress azimuth around the field demonstrates a rotation of 15° from the north toward the east which introduced uncertainty in defining MW in the well trajectory that could be affected by rotation. The sidetrack was successfully initiated as expected, the hole was drilled to bottom, and liner landed successfully. However, a significant increase of MW from its starting value was required, and the model was subsequently adjusted based on LWD data. Maintenance of high concentration of bridging while continuously nourishing the mud helped in stabilizing the wellbore. Unlike previous sidetracks, non-productive time was eliminated with significant cost reduction.