Bar actuated vent assembly and perforating gun
A casing gun is suspended downhole adjacent to a hydrocarbon containing formation by attaching the gun to the end of a tubing string. A packer device isolates the lower downhole casing annulus from the upper casing annulus. The casing gun has a firing head located at the upper end thereof which is actuated in response to impact. A vent assembly underlies the packer and is connected in series relationship respective to the gun firing head and the packer. A specially constructed bar device is dropped into a lubricator at the wellhead and travels down the interior of the tubing string, where the bar impacts against a sliding sleeve of the vent assembly, thereby moving the sleeve and opening a port which communicates the interior of the tubing string with the lower casing annulus. The bar continues to travel downhole until it impacts against the firing head, thereby detonating the perforating gun. Hence, the present invention comprehends the provision of a special weight which is dropped downhole to sequentially impact against a novel vent assembly and against a perforating gun head in rapid succession, so that a hydrocarbon containing formation can be completed in an unusual manner.
- Assignee:
- Geo Vann Inc
- Patent Number(s):
- US 4299287
- OSTI ID:
- 5854965
- Country of Publication:
- United States
- Language:
- English
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