دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a device installed in the tubing string of a producing well to shut in the flow of production if the flow exceeds a preset rate. Tubing safety valves are widely used in offshore wells to prevent pollution if the wellhead fails for any reason. Also called subsurface safety valve.

n: a device encircled with rubber rings and made up on tubing to fit into a seal-bore packer.

n: The seal nipple at the bottom of oil tube in completion equipment.

n pI: slips designed specifically to be used with tubing.

n: a device used with slips to prevent tubing from falling into the hole when a joint of pipe is being unscrewed and racked. tubing sub n: any type of sub used in the tubing string. See sub.

the holder for the slips on a rig. Suspends the tubing during connection make-up.

n: a valve operated by tubing rotation that is used to shut off formation pressure above a packer, thus testing all connections from the packer to the tree. tubing test string n: a string of tubing run in a well for a production test in which a well test surface package is used. A tubing test string is similar to a normal tubing string except that it may contain special valves and other tools needed for the well test.

n pI: large wrenches used to break out and make up tubing. They may be operated manually, hydraulically, or pneumatically.

a gas lift valve controlled by pressure in the tubing.

n: a perforating gun that is lowered into the well on the tubing string. See also perforate.