دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: an acid treatment in which an acid mixture is circulated through a wellbore to clean it.

n: one of usually two, three, or more mud tanks that holds drilling mud that is being circulated into a borehole during drilling. They are called active tanks because they hold mud that is currently being circulated.

abbr: circulated;used in drilling reports. circle wrench n: see wheel-type back-off wrench.

n: The operation that joins the driving stem to pick up drill stem and circulate the drilling fluid when touch sticking

n: on an engine, a bag-shaped piece made of cotton or fiber cloth that fits into a special holder in the fuel system piping. Fuel is circulated through the bag, which removes foreign matter from the fuel.

mechanical device activated by pumping a ball of a certain size down the tubing in the injected or circulated fluid.

n: 1. the pressure at the bottom of a borehole. It is caused by the hydrostatic pressure of the wellbore fluid and, sometimes, by any back-pressure held at the surface, as when the well is shut in with blowout preventers. When mud is being circulated, bottomhole pressure is the hydrostatic pressure plus the remaining circulating pressure required to move the mud up the annulus. 2. the pressure in a well at a point opposite the producing formation, as recorded by a bottomhole pressure bomb.

n: The pressure at the bottom of the borehole, or at a point opposite the production formation.

the capacity of an injected or circulated fluid to transport a given sized and density solid into a zone or from a well.

n: the amount of pressure that, when applied inside a string of casing, causes the wall of the casing to fail. This pressure is critically important when a gas kick is being circulated out, because gas on the way to the surface expands and exerts more pressure than it exerted at the bottom of the well.

n: The pressure leading to collapsing of the casing.

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