دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: Usually refers to a pipe connection around a valve or other control mechanism. A by-pass is installed in such cases to permit passage of fluid through the line while adjustments or repairs are made on the control that is by-pass.

n: The valves that make vibrosieve short out. The drill fluid which returns from wellbore enters into circulating system directly without sieving handling.

n: a special mill that has a heavy tubular extension below it called a pilot or stinger. The pilot, smaller in diameter than the mill, is designed to go inside drill pipe or tubing that is lost in the hole. It guides the mill to the top of the pipe and centres it, thus preventing the mill from by-passing the pipe. Also called a piloted mill.

n: a kinds of special made milling tool.

a step-diameter mill that makes a pilot hole then enlarges it with the upper diameter.

a polished nipple is run below blast joints to allow a pack-off set point when by-passing a damaged joint.

n: a relatively small pipe that is a by-pass from the main pipeline. Liquid in the pipeline also flows through the loop, from which the liquid can be sampled.