Some call the tall rig 27-1 the 27-2, the -2 they call -3 and the -3 they call -4. Normal PHRF practice does
not change dash numbers when the rig is the only thing that is changed.
Some call the tall rig 27-1 the 27-2, the -2 they call -3 and the -3 they call
-4. Normal PHRF practice does
not change dash numbers when the rig is the only thing that is changed.