دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a type of mechanical jar in which a fluid moving through a small opening slows the piston stroke while the crew stretches the work string. After the hydraulic delay, a release mechanism in the jar trips to allow a mandrel to spring up and deliver a sharp blow. Compare mechanical jar, rotary jar.

n: a tool that is shocking while drilling ,its mainly used to jam release.

n: a percussion tool operated mechanically to give an upward thrust to a fish by the sudden release of a tripping device inside the tool. If the fish can be freed by an upward blow, the mechanical jar can be very effective. Also called a hydraulic jar.

n: A type of jar that incorporates a mechanical trip or firing mechanism that activates only when the necessary tension or compression has been applied to the running string. In slickline operations, the term is often used to describe any jar that does not c

a device used to provide a short space of free wireline travel before solidly connecting to the BHA in a string. Used in fishing.

n: a type of mechanical jar whose jarring force is actuated and determined by rotating the work string;the more torque, the harder the jar. See mechanical jar.

a mechanical jar, used commonly on wireline.