دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the property exhibited by a fluid that is in a liquid state when flowing and in a semisolid, gelled state when at rest. Most drilling fluids must be thixotropic so that cuttings will remain in suspension when circulation is stopped.

n: The characteristic of a fluid, such as a drilling mud, to form a gelled structure over time when not subject to shearing and then to liquefy when agitated. The viscosity of a thixotropic fluid changes with time under constant shear rate until reaching equ

n: a radioactive metallic element found combined in minerals.

Th232, one of the natural isotopes that as a trace element may incorporate into the matrix of naturally forming barium or strontium sulfate scale and make it a very low level radioactive material (NORM scale).

n: The change valve that have three position and five way.

seismic maps that show detail in three directions. A network or grid of values that models a geologic surface or structure as a surface of density contrast (gravity),or susceptibility (magnetic).

n: (TLV) the aver- age concentration of toxic gas in a breathing atmosphere in which a normal person can be exposed safely for 8 hours per day, S days per week;usually established by a regulatory agency such as OSHA.

a limit flow velocity for a specific fluid, either minimum or maximum, that would accomplish a task. Threshold Velocities are usually minimums to promote liquid lift in a gas well, or a minimum velocity to keep a pipe surface clean.

n: The assembly of valve, throttle valve, apparatus and pipeline,which be used to control the velocity come from bore hole after shutting down preventer.

n: the choking or failing that occurs when a mud pump fails to deliver a full amount of fluid through one or more of its valves. Throttling is usually caused by improper valve lift.

controlling flow with a reduced orifice.