دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n pi: a pressure-sensing element of cylindrical shape whose walls contain convolutions that cause the length of the bellows to change when pressure is applied. bellows meter n: see orifice meter.

n: (b) measure of the relationship of the size of the pipe through which fluid is flowing and the size of a restriction, such as an orifice.

n: part of a company that interprets and processes the charts. The departments responsibilities include calculating the gas flow from the information on the chart. Today, charts have been largely supplanted by electronic readouts generated by computer controlled sensors at the orifice meter station. These readouts are transmitted to the companys computers in a central, or district, office, where they are recorded and read.

n: a device with an orifice installed in a line to restrict the flow of fluids. Surface chokes are part of the Christmas tree on a well and contain a choke nipple, or bean. with a small-diameter bore that serves to restrict the flow. Chokes are also used to control the rate of flow of the drilling mud out of the hole when the well is closed in with the blow-out preventer and a kick is being circulated out of the hole. See adjustable choke. bottomhole choke. positive choke.

n: A device incorporating an orifice that is used to control fluid flow rate or downstream system pressure. Chokes are available in several configurations for both fixed and adjustable modes of operation. Adjustable chokes enable the fluid flow and pressure

a device used to create a controlled pressure drop and allow some expansion of the gas. A choke holds a back pressure on the well fluids, controlling the expansion rate of the gas. It is useful for optimizing natural gas lift in oil wells with sufficient

n: a pipe-shaped device with a restriction, usually an orifice or nozzle, that is used to measure the velocity of gas flow during an open-flow test of a gas well.

n: the reduction in pressure that occurs as gas flows through a restriction in a line, such as through an orifice.

n: on a flow recorder, the pen used to record differential pressure across the orifice in the meter;usually recorded in red ink on the flow recorder chart.

n: the extent of variation between the lowest and highest differential pressures that an orifice meter can accurately measure.

n: a type of orifice meter chart that indicates the differential pressure and static pressure for a particular time period. The pressures can be read directly from the chart instead of being calculated from information given on the chart.

n: a measure of the efficiency with which gas flows through an actual orifice. Compares the actual orifices discharge rate with an ideal orifices discharge rate.

n: the ratio of the actual flow and theoretical flow which is expressed by C