We have used 13 3/8" Casing (68 ppf, BTC, NO torque rings) with the
Weatherford DS-II Drillshoe to drill 850 ft of shale. The observed
torque did not come anywhere close to the make-up torque of the
casing. As per attached summary sheet the torque did not exceed 1,000
ft.lbs. The anticipated torque during planning of the operation had
been 4,000 ft.lbs.
Torque while drilling was never considered a concern.