دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: (SP) one of the natural electrical characteristics exhibited by a formation as measured by a logging tool lowered into the wellbore. Also called selfpotential or Sf.

n: (SP) a measurement of the electrical currents that occur in the wellbore when fluids of different salinities are in contact. The SP curve is usually recorded in holes drilled with freshwater- base drilling fluids. It is one of d1e curves on an electric well log. Also called self-potential curve.

n: (SP) the spikes or peaks in the curve on an SP log, measured with respect to a shale baseline.

n: (SP) a record of a spontaneous potential curve.

One of the oldest and simplest logs. Measures voltage between formations and the fluid in the wellbore. Potential differences arise due to the differences between salinity of the formation and the wellbore fluids. SP is used for qualitative permeability,

n: the drawworks drum. Also a casinghead or drilling spool. v: to wind around a drum.

n: A device used to handle and temporarily store a coiled tubing string. Spoolers generally are configured with a removable drum that allows transport spools to be inserted, allowing a new string to be spooled onto a reel. The term is also occasionally used

n: a slide-type hydraulic valve that has a movable part called a spool.

v: to pump a designated quantity of a substance (such as acid or cement) into a specific interval in the well. For example, 10 barrels (1,590 litres) of diesel oil may be spotted around an area in the hole in which drill collars are stuck against the wall of the hole in an effort to free the collars.