دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

Static condition of the length of tubing in the well, where buoyed tube weight (well fluid sensitive) equals the well pressure acting against the cross-sectional area of the tube. The balance point does not include any frictional forces exerted by frictio

cycling coiled tubing from a yielded position, through a transition region, and back again. Running coiled tubing from the reel into a well and back to the reel involves six bends or three cycles.

a weld technique on diagonal cut strips of steel, superior to the butt weld process for joining flat strips of metal together before rolling into coiled tubing.

any of several radioactive, chemical or physical properties logs that are run in a cased hole environment. May be conveyed by electric line, coiled tubing, slick line (memory logs) or drill pipe (LWD).

concentric coiled tubing.

n: a continuous string of flexible steel tubing, often hundreds or thousands of feet long, that is wound onto a reel, often dozens of feet in diameter. The reel is an integral part of the coiled tubing unit, which consists of several devices that ensure the tubing can be safely and efficiently inserted into the well from the surface. Because tubing can be lowered into a well without having to make up joints of tubing, running coiled tubing into the well is faster and less expensive than running conventional tubing. Rapid advances in the use of coiled tubing make it a popular way in which to run tubing into and out of a well. Also called reeled tubing.

n: (1)A long, continuous length of pipe wound on a spool. The pipe is straightened prior to pushing into a wellbore, and is recoiled to spool the pipe back onto the transport and storage spool. (2)A generic term relating to the use of a coiled tubing techniq

a continuous reeled tube from 1” diameter to >3.5” diameter. The tubing is injected into a well via a coiled tubing unit (CTU) and can be used to unload wells with liquid, foams or gasses, logging, fracturing, etc.

a completion where CT and associated CT-mounted hardware is used as the primary completion flow path.

a mechanical device used to join strings of CT or attach a BHA to the CT.

where CT is used as the primary drill string with a mud (less commonly an electric) motor to rotate the bit. Often used in underbalanced drilling.

n: Theuseful life of a coiled tubing work string is limited due to fatigue damage. This damage is caused by the repeated bending and straightening of the coiled tubing at the gooseneck and reel. The resulting failure mechanism is referred to an low cycle fat