دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a rubber or rubberlike device on a special rod (a swab),which forms a seal between the swab and the wall of the tubing or casing.

v: to pull off during a trip into or out of the hole because of pressure differential. For example, if a packer is run in too quickly, the pressure differential across the packer swabs off the packing elements, making it necessary to trip back out to replace them.

the valve at the top of the tree, above the flow cross or flow Tee. The lubricator for interventions may be attached above this valve or the valve may be removed to fit a larger lubricator.

n: formation fluid that is pulled into the well bore because of an underbalance of formation pressure caused by pulling the drill string too fast.

n: a phenomenon characterized by formation fluids being pulled or swabbed into the wellbore when the drill stem and bit are pulled up the well bore fast enough to reduce the hydrostatic pressure of the mud below the bit. If enough formation fluid is swabbed into the hole, a kick can result.

n: downward bend in a pipeline to conform to a dip in the surface of the rightof- way or to the contours of a ravine or creek. swage n: a solid cylindrical tool pointed at the bottom and equipped with a tool joint at the top for connection with a jar. It is used to straighten damaged or collapsed casing or tubing and drive it back to its original shape. v: to reduce the diameter of a rod, a tube, or a fitting by forging, hammering, or other method.

n: A threaded adapter used to connect a circulating line to a casing or tubing string. A casing or tubing swage generally is required as a contingency option to enable any obstruction or fill to be circulated clear during the running process.

a smooth faced tool that is used to try to re-round ovaled tubing.

n: a pipe fitting with external threads of different sizes on each end.

n: The male thread nipple that has different diameter at two ends.