Benoil Services Ltd

6.10. Dart Cone Tail Shape

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.

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