Firing system for tubing conveyed perforating gun
This patent describes a system for firing a tubing conveyed perforating gun suspended in a well utilizing a drop bar. This system consists of: (a) A percussion activated firing means attached between a tubing string and at least one perforating gun. The firing means includes a first end adjacent the tubing string for receiving an activating force and a second end adjacent the at least one perforating gun for transmitting an explosive force to the at least one perforating gun; (b) A drop bar for introducing into the tubing and contacting the first end of the firing means. This drop bar includes a housing with an attached stop means, a mandrel movably attached to the housing, and a contacting end attached to the mandrel and movable in relation to the stop means. The drop bar has a retractor for moving the contacting end toward the stop means after the retractor is activated; (c) A guide for receiving the drop bar and directing the contacting end toward the first end of the firing means; and, (d) An abutment fixed in relation to the firing means for receiving the stop means. The drop bar may be safely fished from the tubing or the guns safely removed from the well in the event of a misfire.
- Assignee:
- Schlumberger Tech. Corp., Houston, TX
- Patent Number(s):
- US 4566544
- OSTI ID:
- 5855558
- Country of Publication:
- United States
- Language:
- English
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