دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: Make rock into a coupon similar to metallic stretching stick,and then put the coupon on the material testing machine to make the drawing test.

n: see stretch.

an increase in length expressed numerically as a percent of initial length.

n: Because the drilling pipe is subiected to the repeated stretching force and compressional force when the pipe rotates in conditon of bending ,the pipe will be broken when it gets to the endurance limit

n: the drill tower ladder is joined by pin, with protecting divice,and stretched with the extendible derrick stretching out and infolding .

n: an area or point above the point at which a tubular, such as drill pipe, is stuck in the wellbore.

n: the depth at which pipe is struck, or more specifically the depth immediately above the point at which pipe is stuck.

a technique for estimating the highest free point in a string of stuck pipe. It is based on a differential stretch calculation with amount of pull and the free point constant (FPC).

n: A wireline tool used to determine the free point on a stuck string. The free-point indicator operates by detecting stretch in the tubular when tension is applied at surface. If stretch is not detected, the string must be stuck above the tool;if stretch i

a tool with strain gauges that is run on wireline and moved along the stuck pipe with successive pipe pulls until the stuck point is located.

n: this states that for an elastic material, stress is proportional to strain. In practical terms if a load is doubled then the stretch in the material duo to that load is also doubled, as long as the elastic limit of the material is not exceeded. Thus as th

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: the permanent lengthening that occurs to new wire rope when it is put into service.

n: a form of sucker rod pumping unit in which the rotor is a chrome-plated steel external helix and the stator is a synthetic elastomer with a double internal helix permanently bonded into a steel housing. Rotation of the rods by a vertical spindle electric motor at dte surface causes the rods to stretch a predetermined amount to maintain the rod string in tension. It also causes a cavity containing well fluid to progress upward. The system is a rotary positive-displacement unit.