دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the migration of oil or gas in a reservoir toward a wellbore due to pressure reduction caused by the wells penetration of the reservoir. A drainage point is a wellbore (or, in some cases, several wellbores) that drains the reservoir.

n: drilling one or two wellbores toward the producing pay in a small diameter

n: I. the difference between static and flowing bottomhole pressures. 2. the distance between the static level and the pumping level of the fluid in the annulus of a pumping well.

the difference between two pressures. Completion drawdown is the pressure differential from the formation near the wellbore to the wellbore.

a tool with a set diameter used to check the wellbore for clearance prior to running a tool string or piece of equipment.

n: the angle at which a wellbore deviates from the vertical, expressed in degrees, as revealed by a directional survey. Also called angle of deviation, angle of drift, and inclination. See directional survey.

n: refer to hole deviation angle

v: 1. to deflect the wellbore away from an obstruction in the hole. 2.(slang) to get the better of someone (e.g., He drilled around me and got the promotion").

n: drilling down bypassing the obstacles in the well such as fish

v: 1. to remove with the bit the residual cement that normally remains in the lower section of casing and the wellbore after the casing has been cemented.2. to remove the settlings and cavings that are plugged inside a hollow fish (such as drill pipe) during a fishing operation.

drilling through the cement after a primary cement job as the hole is deepened.

adj: pertaining to packers and other tools left in the wellbore to be broken up later by the drill bit. Drillable equipment is made of cast iron, aluminum, plastic, or other soft, brittle material.

downhole tools and equipment that can be broken up by the bit.

n: refer to hard-metal insert

n: drilling the layer into wellbore with mechanical equipment

the action of placing a hole to a depth and location.