rod string

rod string

[′räd ‚striŋ]
(mechanical engineering)
Drill rods coupled to form the connecting link between the core barrel and bit in the borehole and the drill machine at the collar of the borehole.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
During the process of sucking viscoelastic fluid, clearance between pump barrel and plunger, and rod tube flow passage lead to the increase of down resistance of the sucker rod, the resistance reduces gradually from the largest value at the bottom to the neutral point, which causes lateral force of the rod string, and results in partial wear.
A rod string is pushed through the run of pipe, and it is used to pull back the tool or cutting head, which shatters or splits the old pipe.
This lifts them from the rack and holds them under the chuck, whilst the rotation threads them up to the rest of the rod string.
ACenter Pivot Extreme riser provides a stiff shooting platform and is the base for the one-piece synthetic grip, Revolver Riser Dampeners, FLX-Guard cable-containment system and carbon rod string stop.
It is important to note that a beam pumping system converts the rotational motion on the surface to a vertical lifting mechanism of the rod string and downhole plunger unit.
The HydroBurst HB125 is capable of replacing pipes from 4-20 inches in diameter and features a unique rotating rod string that can punch through collapsed lines.
The rate of change of hole direction has to be closely monitored to ensure that hole deviations do not exceed the capabilities of the rod string. Excessive hole deviation can lead to rod breakage at the tool joints and/or to severe bending of the rods.
A one-piece synthetic grip with semi-soft BOWTECH logo inlays, a stainless steel stabilizer mounting insert, a carbon rod string stop and the Bio-Shock Extreme Dampening System complete the CPX package.
It transfers the sucker rod string load of a well into the balance load of a corresponding well.
When using the TIP method, small to medium sized deformations and off-settings can be evened out and the circular profile of the pipe restored with a roller grinding head attached to the rod string. No annular filling is required and less space and fewer personnel are needed for a successful pipe restoration using the TIP method.