دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

the force required to move a given area of fluid. Units are Newtons per sq. meter.

n: viscosity reduction of non- Newtonian fluids (e.g., polymers, most slurries and suspensions, and lube oils with viscosity-index improvers) under conditions of shear stress.

n: The effect that the viscosity of some non-Newtonian fluid will decrease at the shear pressure .



a fluid that when sheared, reduces viscosity.

n: A kind of water-in-oil plugging agent.

n: A type of vertical seismic profile in which the source is a shear-wave source rather than a compressional-wave source. Shear waves travel through the Earth at about half the speed of compressional waves and respond differently to fluid-filled rock, and so

n: an action, resulting from applied forces, which causes or tends to causes or tends to cause two contiguous parts of body to slide relative to each other in a direction parallel to their plane of contact.

an impact or pressure load that shears the pin in a downhole tool and allows another tool function.

n: an instrument used to measure the shear strength, or gel strength, of a drilling fluid. See gel strength.

n: The equipment be used to measure the shear intensity of drilling fluid.

a jacket or armour, often around a logging cable, a gauge cable, or a pump cable.

(pronounced shiv") n: I. a grooved pulley. 2. support wheel over which tape, wire, or cable rides.

n: A pulley. In oilfield usage, the term usually refers to either the pulleys permanently mounted on the top of the rig (the crown blocks),or the pulleys used for running wireline tools into the wellbore. In the case of the crown blocks, the drilling line,

a grooved pulley.

n: a measuring instrument used to determine the size of sheaves on a block. It has sized metal fingers which are placed inside sheave grooves to calibrate the grooves.