دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a geological formation of interest to drillers. For example, if a particular well is on the edge of a structure, the wellbore has penetrated the reservoir (structure) near its periphery.

n: The layer position of wellbore in there drillstring be sticked.

elevating the near wellbore pressure of a formation through leak-off of wellbore fluids during drilling, completion or workover.

n: a hollow, rubber-faced cylinder mounted on a hollow mandrel with a pin joint on the upper end to connect to the swab line. A check valve that opens up- ward on the lower end provides a way to remove the fluid from the well when pressure is insufficient to support flow. v: 1. to operate a swab on a wireline to bring well fluids to the surface when the well does not flow naturally. Swabbing is a temporary operation to determine whether the well can be made to flow. If the well does not flow after being swabbed, a pump is installed as a permanent lifting device to bring the oil to the surface. 2. to pull formation fluids into a wellbore by raising the drill stem at a rate that reduces the hydrostatic pressure of the drilling mud below the bit.

reducing the well pressure below the swab tool by rapid upward movement of a tool or equipment in a wellbore. Swabbing may be intentional using a wireline swab cup tool to lift water or unintentional by fast movement of a pipe or wireline conveyed, large

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.

a displacement. In the reservoir a sweep is displacement of a hydrocarbon fluid from a reservoir rock by a flooding fluid. In the wellbore, a sweep is a viscous pill circulated around to help clear the wellbore of cuttings or debris.

the amount of the wellbore that is circulated by fluid (describes the hold-up and upswept volume).

n: guiding a downhole tool into the wellbore or onto the rig floor.

n: 1. a condition wherein the hole diameter narrows with depth owing to wear on the bit gauge caused by drilling abrasive formations. 2. a wellbore whose diameter is larger near the surface than near the bottom.

n: wells top hole diameter larger than lower hole, because bits diameter be grinded in drilling process.

a mill with a gradual concave or convex taper designed to enlarge the wellbore.