دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a focused system designed to measure the true formation resistivity in well bores filled with salty mud. Current is forced by guard electrodes to flow into the formation. Also called Laterolog N.

n: a kind of soft rock with high montmorillonite and water,and which is easy to absorb water and swell ,as a rusult , the borehole lessens,the tools and bit are balled up ,jams the borehole ,and even leads other borehole problems

n: an oilwell that has come in with such great pressure that the oil jets out of the well like a geyser. In reality, a gusher is a blowout and is extremely wasteful of reservoir fluids and drive energy. In the early days of the oil industry, gushers were common and many times were the only indication that a large reservoir of oil and gas had been struck. See blowout.

n: an uncontrolled release of oil from the wellbore at surface.

a well drilled into a high pressure formation that results in an immediate surge towards the surface. In the days of cable tools with minimum fluid (hydrostatic) head, the formation fluids often flowed to surface when the pay zone was penetrated.

n: a kind of inorganic salt fluid depressant which is made form gypse that is heated to 150 celsius degrees

n: A calcium-based water mud system containing gypsum. Gyp mud can be used for drilling shales, but it is also well-suited for drilling gypsum, anhydrite and salt stringers. An advantage of gyp over lime muds is that the pH of gyp mud need not be so high bec

n: a surveying device that provides a series of photographic discs showing the inclination and direction of the wellbore.it measures direction by means of a gyroscopic compass.

n: rock salt (NaCI).

n: a kind of nature saline formation whose primarcy component is solium chloride

sodium chloride, NaCl.

n: the rock surface forming the upper side of a fault when the fault plane is not vertical-that is, if the dip is less than 90. Compare footwall.

the body of rock that lies above an inclined fault plane.

n: in a well-control operation, closing the BOP without first opening an alternate flow path up the choke line. When the BOP is closed, pressure in the annulus cannot be read on the casing pressure gauge.