دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a mechanism for anchoring a bottomhole pump in a well;located on the lower end of the pump. Compare top hold-down.

n: the holding of formation rock chips in place as a result of high differential pressure in the wellbore (i.e., pressure in the wellbore is greater than pressure in the formation). This effective- its the cutting action of the bit by retarding circulation of bit cuttings out of the hole.

n: a mechanical arrangement that prevents the upward movement of certain pieces of equipment installed in a well. A sucker rod pump may use a mechanical hold-down for attachment to a seating nipple.

n: a hydraulic, toothed device in a packer that uses differential pressure across the packer to grip casing and prevent upward packer movement.

n: The pressure difference of drill fluid static fluid column pressure acting on the cuttings of the bottom of a well to reservoir pressure.

n: the downhole assembly used to lift fluid to the surface by the reciprocating action of the sucker rod string. Basic components are barrel, plunger, valves, and hold-down. Two types of sucker rod pumps are the tubing pump, in which the barrel is attached to the tubing, and the rod, or insert, pump, which is run into the well as a complete unit.

n: a mechanism, located at the top of the working barrel, for anchoring a sucker rod pump to the tubing. Compare bottom hold-down.

n: a sucker rod insert pump in which the working barrel travels and the plunger remains stationary. The working barrel is connected to the sucker rod string through a connector and the traveling valve;the standing valve is connected to the top of the plunger, which in turn is connected to the bottom hold-down.