دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

the spool or hanger receiver in the wellhead, above which the master valve is the primary control.

movement of any tool via the tubing string.

n: a device installed in the tubing string of a producing well to shut in the flow of production if the flow exceeds a preset rate. Tubing safety valves are widely used in offshore wells to prevent pollution if the wellhead fails for any reason. Also called subsurface safety valve.

n: a valve operated by tubing rotation that is used to shut off formation pressure above a packer, thus testing all connections from the packer to the tree. tubing test string n: a string of tubing run in a well for a production test in which a well test surface package is used. A tubing test string is similar to a normal tubing string except that it may contain special valves and other tools needed for the well test.

a gas lift valve controlled by pressure in the tubing.

n: a fine, very hard, gray crystalline powder, a compound of tungsten and carbon. This compound is bonded with cobalt or nickel in cemented carbide compositions and used for cutting tools, abrasives, and dies.

n: The gray stiff powder,cannt dissolve in the water, but can dissolve preferablly in the nitric acid and hydrofluoric acid.

a hard, abrasion resistant compound used in cutting tools such as mills and bits.

n: a very hard, and relatively small, cylinder made of tungsten carbide bonded with nickel or cobalt. One end of the insert is rounded or tapered;the other end is truncated (cut oft) and inserted into a bit cone. The round or tapered end contacts the formation and drills it. Several inserts make up the cutters on a tungsten carbide insert bit.

n: a bladed rotor flowmeter component that turns at a speed that is proportional to the mean velocity of the stream and therefore to the volume rate of flow.

n: a velocity-measuring device for fluids in which the flow is parallel to the rotor axis and the speed of rotation is proportional to the rate of flow. The volume of gas in gas measurement is determined by counting the revolutions of the rotor. In liquid turbine meter measurement, the meter and electronic instrumentation are combined to measure total flow and/or flow rate within the piping system.

n: see turbodrill.

n: The dynamic drill that driving the turbine turn by drill fluid.

a motor spun by injected fluid moving past vanes affixed to the rotor.