String shot back-off tool with pressure-balanced explosives
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United States of America Patent
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Mar 26, 2019
Grant Date -
Sep 13, 2018
app pub date -
Sep 18, 2015
filing date -
Sep 18, 2015
priority date (Note) -
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Abstract
A “back-off” tool comprises a magazine cylinder having one distal end of a long mast rod secured to the lower end-face of a magazine cylinder. The magazine cylinder is attached to an electrically detonated firing head. A first plurality of blind hole cavities penetrate the magazine cylinder end-face around the mast rod junction. A second plurality of elongated detonation cord ends are inserted into high temperature grease filled magazine cylinder cavities. From the cavities, the detonation cord lengths are bound to the rod surface along the rod length by non-metallic cord. The tool assembly is secured to the end of a wireline or tubing string for downhole placement and detonation.
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