Title: Sealing projectile

Abstract: An improved sealing projectile for use in a borehole perforating tool of a type wherein there is an explosive charge such as one or more shaped charge units disposed in each of a plurality of chambers that are located one above the other, with a partition means between each two adjacent chambers and sealingly isolating the adjacent chambers but for a passageway in the partition means through which ignition wires are passed, with a sealing projectile driven into sealing relation with the lower end portion of the passageway upon detonation of the explosive charge in the lower one of the adjacent chambers. The improved sealing projectile is provided a guide portion having a cylindrical exterior surface adapted for mating with the interior surface of said passageway and having slot means extending longitudinally of the guide portion from its outer end inwardly a distance less than the length of said guide portion but sufficient to permit an end portion of the guide portion to be disposed within said passageway while permitting ignition wires to pass from said passageway through said slot means to the lower one of said adjacent chambers, and a sealing portion merging with said guide portion.

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Inventors: Hallmark, Bobby J. (Fort Worth, TX, US)

Application Number: 835205
Filing Date: 1977-09-21
Publication_date: 1979-08-21
Assignee: Gearhart-Owen Industries, Inc. (Forth Worth, TX)
Primary Class(es): 89/1.15 102/310, 102/313, 166/55.1, 175/4.55
Other Classes:
US Patent Ref:

3010396	Nov, 1961	Coleman	175/4.
3246707	Apr, 1966	Bell	175/4.
3327792	Jun, 1967	Boop	175/4.
3441093	Apr, 1969	Boop	175/4.
3528511	Sep, 1970	Boop et al.	175/4.
3768408	Oct, 1973	Hallmark	102/21.

Other Refs:
Primary Examiner: Brown, David H.
Assistant Examiner:
Attorney: Wofford, Fails & Zobal