دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the observed value of a variable determined by a single measurement.

n: a cast-iron or magnesium drillable tool consisting of a packing assembly and a back-pressure valve. It is used to close off the annular space between tubing or drill pipe and casing to allow the placement of cement or fluid through the tubing or drill pipe at any predetermined point behind the casing or liner, around the shoe, or into the open hole around the shoe.

n: A kind of iron casting tool with drillability.

n: The amount of time a liquid stays in a vessel. The retention time assures that equilibrium between the liquid and gas has been reached at separator pressure. The retention time in a separator is determined by dividing the liquid volume inside the vessel b

the time, based on the separator volume and shape and the fluid flow rate that produced fluids spend in a separator. It is based on the time needed to separate an emulsion.

friction reducing material composed of very small particles. Also used in lab tests to simulate mud cutting fines.

v/n: 1. The intentional pumping of wellbore fluids down the annulus and back up through the drillpipe. This is the opposite of the normal direction of fluid circulation in a wellbore. Since the inside volume of the drillpipe is considerably less than the volum

circulating down the annulus and up the tubing.

n: a type of in situ combustion in which the combustion front moves counter to the direction of the injected air. Air is injected into a production well and burning is started near the well. When the combustion zone has advanced a short distance from the well. air injection is stopped from the production well and started from an adjacent injection well. The fire advances toward the injection well, but the oil moves toward the production well. This method may be used with very viscous oils. Compare forward combustion.

v: to displace the wellbore fluid back to the surface;to displace tubing volume back to the pit.

removing gravel or cement by shifting the packer or opening the sleeve and circulating out of a well by reverse circulating.

n: a device that increases an engines speed by decreasing the positive voltage going to the electric actuator and governor. As the engine needs more fuel to go faster, the reverse-acting actuator decreases the positive voltage to make the governor increase the fuel. Compare direct-acting electric actuator. See governor.

n: a fishing tool that is lowered into the hole during nonnal circulation and then produces reverse circulation to create a vacuum so that junk is sucked inside the tool. Also called a jet-powered junk basket.

n: see anticirculating fishing basket.