
73
C
Catalytic Hydrotreating
Casing Swage or Broach: A hardened steel tool, commonly run on wire line,
which is used to reshape the casing.
Casing Tongs: (1) Wrenches specically made for making up casing joints.
(2) Pipe tongs used to make connections.
Casing Valve: A gas lift valve that is controlled by the casing or annulus gas
supply pressure.
Casing Wear: Reduction in thickness × 100/original thickness. Most com-
mon wear is from rotating strings during drilling.
Casing Weight: The nominal weight per foot of the casing. Heavier weight
casings of the same size are necessarily smaller ID.
CaSO
4
: See Calcium sulfate.
CaSO
4
–H
2
O: See Gypsum.
Cast