Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Patent
1976-11-05
1978-03-14
Purser, Ernest R.
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
175 456, E21B 2900
Patent
active
040786110
ABSTRACT:
A perforating gun apparatus is suspended downhole in a relatively cool zone of a borehole by connecting the gun to a tubing string. The tubing string includes a wireline operated, releasable coupling interposed therein. A packer device is attached to the tubing string uphole of the releasable coupling.
An abutment means is positioned downhole within a relatively high temperature zone and in close proximity to a hydrocarbon bearing formation. The abutment means includes a latch means by which the gun and abutment means are attached to one another.
The releasable coupling is actuated, whereupon the gun is released and falls downhole, where it is arrested by the abutment means. The gun is latched to the abutment means, while the force of the impact detonates the gun, thereby perforating a high temperature zone of the wellbore.
A wireline fishing tool is run through the tubing and downhole into engagement with the released part of the coupling member. The engaged released part of the coupling member, detonated gun, and the abutment means are lifted and thereafter the entire apparatus is repositioned further downhole in the borehole.
REFERENCES:
patent: 2866508 (1958-12-01), Church
patent: 2974739 (1961-03-01), Dean
patent: 3058523 (1962-10-01), McElheny
patent: 3190372 (1965-06-01), Johnson
patent: 3193013 (1965-07-01), Whiteside
patent: 3199287 (1965-08-01), Kinley
patent: 3530948 (1970-09-01), Garrett
patent: 3706340 (1972-12-01), Shuster
patent: 3706344 (1972-12-01), Vann
patent: 3957115 (1976-05-01), Kerzee et al.
Bates Marcus L.
Favreau Richard E.
Purser Ernest R.
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