Dresser Industries, Inc.

Robert G Davidson

John A Barton

James F Wilkin

Apparatus engageable with a well casing for suspending a perforating gun in the casing. The apparatus includes toothed slips forced into engagement with the well casing. A spring maintains an engaging force on the slips with the casing. In response to detonation of the perforating gun, a first release mechanism is operated to allow the perforating gun to drop a short distance. After initial dropping of the perforating gun, a second release mechanism is operated to release the engagement of the toothed slips with the casing, thereby allowing the entire unit to fall to the bottom of the well. A retrieval tool attached to a tubing string can be utilized to operate the second release mechanism, disengage the unit from the casing, and retrieve it from the well.

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Peterculter, United Kingdom

Robert G Davidson