دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

an empirical relationship between the formation resistivity, F, and porosity, , in which F=1/m, where the porosity exponent or cementing factor, m, is a constant for a particular formation. Typical m’s are 1.8 to 2.0 for consolidated sandstones and 1.3

n: a mobile submersible drilling structure used in arctic areas. The rig is towed onto the drilling site and submerged during periods when the water is free of ice. All equipment below the waterline is surrounded by a caisson to protect it from damage by moving ice. The drilling deck has no square comers so that moving ice can better flow around it. See submersible drilling rig.

n: See permafrost.

the area surrounding a well within which drawdown and production has changed the saturation and energy of the system.

n: an area, usually outlined on a plat attached to a farmout agreement or described in an exhibit, that allows both parties the first right of refusal on leases acquired by either party after the agreement is executed.

the flow area generated by perforations across a zone of interest. Typical calculated perforation entrance hole areas are 1% to 6% of the pipe body. Used in pressure drop calculations.

n: see minimum lawful price clause.

the area of the surface of a grain to its physical volume.

exposed area of a pore or fracture to the volume of fluid in the pore or fracture.