دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a percussion tool operated manually or hydraulically to deliver a heavy downward blow to fish stuck in the borehole. v: to apply a heavy blow to the drill stem by use of a jar or bumper sub.

n: a downhole tool used to deliver an impact force either up or down to the tool string, usually to operate downhole tools or to dislodge a stuck tool string. Jars of different designs and operating priciples are commonly included on slickline,coiled tubing,

a device run on slickline, coiled tubing, tubing or drill pipe that will sharply increase the impact force of the conveyance when trying to retrieve a stuck tool or equipment.