Operator was drilling a horizontal
in a North Sea development project.
With about 300 meters of
horizontal hole drilled, the operator began to experience severe drag and torque, and
metal shavings appeared in the cuttings. Thuslick was added to the water
based mud system at this point. Torque came down immediately, and stabilized at a
figure 15 Kft.lbs. for the rest of the well. Metal shavings disappeared at once and the
cuttings have remained free of metal shavings since. The well was drilled to T.D. (and
additional 1600 meters) without further problems.