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.
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; said improved sealing projectile comprising: a. 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 b. a sealing portion merging with said guide portion.
Claim 2
Dependent Claim
199 words
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; said improved sealing projectile comprising: a. 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 b. a sealing portion merging with said guide portion.
Claim 3
Dependent Claim
16 words
The improved sealing projectile of claim 1 wherein said slot means is a milled U-shaped slot.
Claim 4
Dependent Claim
15 words
The improved sealing projectile of claim 1 wherein said sealing portion is frusto-conical in shape.
Claim 5
Dependent Claim
28 words
The improved sealing projectile of claim 3 wherein said sealing portion has a taper in the range of 10 to 30 degrees with respect to its longitudinal axis.