|
Previous standard darts, the 12mm series, do align in the tubing so that
when burst there is a through passage for a fluid. But if it is desired
to pass an object such as a ball through the tubing to trigger a lower
tool or packer release, the alignment may not be adequate. Further,
the tail end of the standard dart could cause a ball to lodge to one
side and not be swept through the tubing. The cone tail shape
overcomes this by both centering one dart behind another and enabling
a ball to be directed into the through hole as it is swept along, even
in horizontal sections. This feature is standard in all wider-bore darts.
|
