THE CHALLENGE
A high DLS (dogleg severity), under-reamed well where conventional bow string centralizers are often oversized and damaged due to their weak joints (welded/hinged) when passed through narrower casings. Rigid centralizers, intended to deal with this issue, are undersized and lie on the low side to produce a poor cement displacement and zonal isolation.
THE SOLUTION
Talisman Energy used the 7 x 9 1/2” Centek UROS centralizer. As a precisely fitting bow string centralizer, designed for the wellbore and developed to greatly reduce torque and drag losses, the UROS centralizer offers high fatigue strength for axial forces and radial side loads on bows during tubular rotation.
THE RESULT
Casing reached bottom without incident. The casing string was rotated whilst cementing at 20rpm, 10-15kft lbs torque.
