Related Oil & Gas Terms

• Retainer

  A cast-iron or magnesium drillable tool consisting of a packing assembly and a back-pressure valve. it is used to close off the annular space between tubing or drill pipe and casing to allow the placement of cement or fluid through the tubing or drill pipe at any predetermined point behind the casing or liner, around...

• Stuck pipe

  Drill pipe, drill collars, casing, or tubing that has inadvertently become immovable in the hole. sticking may occur when drilling is in progress, when casing is being run in the hole, or when the drill pipe is being hoisted....

• Drill string

  The column, or string, of drill pipe with attached tool joints that transmits fluid and rotational power from the kelly to the drill collars and bit. often, especially in the oil patch, the term is loosely applied to both drill pipe and drill collars. compare drill stem....

• Blowout preventer

  1. one of several valves installed at the wellhead to prevent the escape of pressure either in the annular space between the casing and drill pipe or in open hole (i.e., hole with no drill pipe) during drilling completion operations. blowout preventers on land rigs are located beneath the rig at the land’s surface; on...

• Packer

  A piece of downhole equipment, consisting of a sealing device, a holding or setting device, and an inside passage for fluids, used to block the flow of fluids through the annular space between the tubing and the wall of the wellbore by sealing off the space between them. it is usually made up in the...