An offshore Qatar operator was concerned with the potential of high fluid
losses and differential sticking while drilling a fractured and faulted carbonate
formation. The formation pressures vary from 4 lb/gal to 9.1 lb/gal equivalent
mud weight. High torque was often encountered requiring 2-3% lubricant by
volume in the lateral. The problems occurred primarily in fields with depleted
zones, microfractures, fractures, and faults.
FLC 2000® was added to the drilling program to determine if it would eliminate
problems encountered on previous wells. The objective with FLC 2000 was
to reduce rig time, fluid losses and overall costs of the drilling operation. The
operator tested the product prior to approval and determined they would run
a concentration of 8 lb/bbl to keep the sand bed test (SBT) invasion at
approximately 4 cm.
FLC 2000® met all performance KPIs for the well. The reduction in lubricant cost
saved at least $200,000. The operator drilled the lateral interval with minimal
losses, no wellbore stability issues, no differential sticking, improved hole
cleaning and reduced torque.