دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a flat-bottom mill shoe with a pilot hole bit

n: a kind hole opener which has cone bits with pilot hole

n: in pipeline construction. the hole drilled as the first step of a directionally drilled river crossing. It establishes a pathway for the pipeline.

n: a small-diameter hole that is later opened up to the required diameter. Sometimes used in directional drilling to control wellbore deviation during kick-off.

a small (sometimes) diameter hole drilled through a pay zone to determine the pay top and bottom or various contacts, before the main well position is selected. May also use a pilot hole to better control influx rate.

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.

n: joints of small-diameter pipe attached to the drill assembly and used to bore a pilot hole when laying pipe. After the route has been established, the pilot string is replaced by the work string.