In addition to the multidisciplinary evaluation and support,
Schlumberger also recommended replacing traditional downhole motors with a
modern rotary steerable system (RSS). Over a 3-year period, Pluspetrol drilled
seven successful horizontal wells in the Marañon basin.
Saving time, accelerating ROI, dramatically lowering costs
By establishing best practices in geomechanics and drilling
optimization, the company significantly reduced geomechanics-related NPT. The
first two wells, for example, had no wellbore instability issues, no stuck
pipe, and only moderate tight hole events, which were easily managed at the rig
site. In another field, historical NPT that resulted from geomechanicsrelated
drilling events dropped from approximately 70% to 15%, or from an average of
more than 2 days to less than a day.
Use of the RSS improved drilling performance, required fewer BHAs per
well, increased total well length 200–300 meters per well, and increased
ROP despite the longer wellbores. Ultimately, Pluspetrol hit its drilling
targets 5 to 9 days ahead of schedule, saving rig time, bringing production
online sooner, and accelerating return on investment.
As a result, costs were dramatically reduced. Previously, drilling
events, fishing, lost in hole events, and sidetracking had cost an estimated
USD 2.38 million (sidetracking alone cost USD 2.2 million) per well. With the
new approach, Pluspetrol not only eliminated about USD 2.36 million of those
costs, but saved an additional USD 420,000 per well by hitting targets ahead of
schedule. Net savings: approximately USD 2.78 million per well.