Increase ROP and drill farther in Siberian field
An operator drilling in eastern Siberia wanted to increase ROP and drill
more meters per run in a field characterized by
The operator's previous drilling efforts in the field using bits on a
positive displacement motor had resulted in low ROP, disappointing run lengths,
and poor borehole quality that often prevented running casing efficiently.
Optimize BHA for greater durability
Schlumberger used the IDEAS integrated drillbit design platform to
8 1/2-in SHARC MDSi716 PDC bit, which was fitted with ONYX II
premium cutters for superior resistance to abrasive wear and thermal
degradation. The bit design included a row of backup cutters positioned to
provide maximum durability in the nose and shoulder areas of the bit's cutting
structure without compromising ROP.
The SHARC bit from Smith Bits, a Schlumberger company, was run on
PowerDrive X6 and PowerDrive vorteX RSSs for accurate wellbore placement,
borehole quality, and additional torque. ASPHASOL shale inhibitor from M-I
SWACO, a Schlumberger company, was used to stabilize shale sections and control
Increase ROP, save rig time
The average ROP in the field increased from 6.53 to 21.41 m/h, and
meters drilled per circulating hour increased from 4.77 to 12.61.