A connection that can be unscrewed by hand.

Circulating member with integral landing nipples

An opening into a tank, usually through the top deck.

To suspend sucker rods in a derrick or mast on rod hangers rather than horizontally on a rack.

Connection of treating line during well servicing, from pump trucks to tree/well

In a well-control operation, closing the bop without first opening an alternate flow path up the choke line.

When the bop is closed, pressure in the annulus cannot be read on the casing pressure gauge.

Compare soft shut-in.