دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a petroleum-bearing rock with good porosity and permeability.

n: the oil layer that is high porosity and permeability.



a productive interval, open to the wellbore.

n: 1. any wellbore in which casing has not been set. 2. open or cased hole in which no drill pipe or tubing is suspended. 3. the portion of the wellbore that has no casing.

n: any wellbore or part of the wellbore that is not supported by casing.

n: A well completion that has no casing or liner set across the reservoir formation, allowing the produced fluids to flow directly into the wellbore. This type of completion suffers the major disadvantage that the sandface is unsupported and may collapse. Al

n: naked section of oil layer is filled with gravel and evenly distribution, which prevent inrush of sand.


a sand control completion for high permeability soft sand formations where the small amount of area offered by the perforations is a restriction on what the formation can deliver to the wellbore.

n: a method of preparing a well for production in which no production casing or liner is set opposite the producing formation. Reservoir fluids flow unrestricted into the open wellbore. An open-hole completion has limited use in rather special situations. Also called a barefoot completion.

n: the procedure of recovering lost or stuck equipment in an uncased wellbore.

attempts to retrieve pipe of tools lost in the open hole.

n: the process of positioning a deflection tool so that it faces in the direction necessary to achieve the desired direction and drift angle for a directional hole.

n: the process by which a deflection tool is correctly positioned to achieve the intended direction and inclination of the wellbore.

n: the extent to which the hydrostatic pressure of the mud column exceeds formation pressure.

n: The amount of pressure (or force per unit area) in the wellbore that exceeds the pressure of fluids in the formation. This excess pressure is needed to prevent reservoir fluids (oil, gas, water) from entering the wellbore. However, excessive overbalance c

where the pressure in the wellbore in higher than the pressure in the reservoir.

n: a fishing tool that is attached to tubing or drill pipe and lowered over the outside wall of pipe or sucker rods lost or stuck in the wellbore. A friction de- vice in the overshot, usually either a basket or a spiral grapple, firmly grips the pipe, allowing the fish to be pulled from the hole.

n: a fishing tool that is attached to the drill pipe and is lowered over the fish and engages externally. An overshot can also be used to recover a wireline survey tool (single shot).

a fishing tool designed to slip over the fish and grasp the outside.

n: a notation of the amount of pressure generated on the drill stem when the mud pumps are run at a speed slower than the speed used when drilling ahead. A p-low or several p-lows are established for use when a kick is being circulated out of the wellbore. Also called kill rate pressure.