The dependence of a density log reading on the ratio of atomic number to atomic mass, which differs slightly between elements.
A type of diode that permits current not only in the forward direction like a normal diode, but also in the reverse direction if the voltage is larger than the breakdown voltage known as "Zener knee voltage" or "Zener voltage".
A special diode designed to operate in the reverse bias breakdown region. A zener is designed to break down at a specific value of reverse bias voltage.
The rating of a zener diode; equal to the value of reverse bias voltage at which breakdown occurs.
A synthetically produced substance with a porous, crystalline structure; a major component of a type of catalyst used in many fluid cat cracking units.
The point where a seismic trace passes through zero amplitude between a peak and a trough.
Zero separation between source and receiver, the idealized geometry a stacked section approximates.
A model's ability to perform a task it was never explicitly trained for, guided only by its general training and the instruction given.
Seismic data for which source and receiver are effectively at the same location.
A VSP with the source close to the wellhead, almost directly above the receivers in the well.
Said of a wavelet symmetrical about zero time, with its energy concentrated at the center.
A rule applied without exception, which gains clarity and loses discretion.
Gel strengths near zero at both ten seconds and ten minutes.
Manual tuning methods, open loop and closed loop, that provide approximate tuning parameters.
A double salt of zinc carbonate and zinc hydroxide, 2ZnCO3·3Zn(OH)2, used as a sulfide scavenger.
ZnBr2, used to make solids-free completion brines up to about 20 lb/gal, and as a heavy liquid for laboratory separations.
ZnCO3, a sulfide scavenger for water-base muds that reacts with hydrogen sulfide to form insoluble zinc sulfide.
ZnCl2, an acidic salt used in very heavy completion brines and as a calibration standard for humidity measurement.
ZnO, a weakly basic solid used as a hydrogen sulfide scavenger in oil-base and synthetic-base muds and in gas sweetening beds.
Drill collars machined with a reduced-diameter groove at the box end so open-and-close elevators can grip them.
The machined reduced-diameter section at the box end of a drill collar that lets elevators grip it.
A valve manifold that routes treatment from the missile to any one of several frac trees in turn.
The four equations giving the amplitudes of reflected and transmitted P and S waves at a planar interface as a function of incidence angle and elastic properties.
Pertaining to a zone — a distinct interval of rock treated as a unit.
Keeping intervals separated behind casing so fluids cannot cross between them.
Zonation is the creation of zones in a logged interval of a well.
An interval of rock distinguished from those around it by lithology, fossil content or fluid.
The protection provided by a distance relay for approximately 90% of a transmission line section.
A zone of backup fault protection provided by a distance relay that covers a line section beyond Zone 1.
A zone of backup fault protection provided by a distance relay that covers a line section beyond Zone 2.
The overlap between what each side would accept, within which a deal exists.
A full-body, one-piece suit worn for total coverage and protection.
