دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a device installed in the tubing string of a gas-lift well onto which or into which a gas-lift valve is fitted. There are two common types of mandrel. In the conventional gas-lift mandrel, the gas-lift valve is installed as the tubing is placed in the well. Thus, to replace or repair the valve, the tubing string must be pulled. In the sidepocket mandrel, however, the valve is installed and removed by wireline while the mandrel is still in the well, eliminating the need to pull the tubing to repair or replace the valve.

n: a device installed on a gaslift mandrel, which in turn is put on the tubing string of a gas-lift well. Tubing and casing pressures cause the valve to open and close, thus allowing gas to be injected into the fluid in the tubing to cause the fluid to rise to the surface.

n: the maintenance work performed on an oil or gas well to improve or maintain the production from a formation already producing. It usually involves repairs to the pump, rods, gas-lift valves, tubing, packers, and so forth.

n pi: special tools or equipment made to be lowered into and retrieved from the well on a wireline, e.g., packers, swabs, gas-lift valves, measuring devices.

tools specifically designed to operate on wireline conveyance. May be either for slickline (non electrical signal conducting) or for electric line.