Controlled directional charges

Claim 2

A controlled directional charge adapted to be lowered into a borehole to fracture a formation comprising a hollow elongated casing, first and second vertically spaced, inwardly directed explosive charges in said casing, at least one laterally directed charge secured in casing intermediate said first and second explosive charges and adapted to provide a perforation in the adjacent formation, a liquid filling said hollow casing intermediate said first and second charges, and detonating means for said first and second charges and said laterally directed charge whereby said laterally directed charge at least partially penetrates the adjacent formation at which time said first and second charges exert opposing forces on said liquid injecting a high velocity jet of said liquid into the perforation initiated by said laterally directed charge.

Claim 3

The invention of claim 1 wherein said laterally directed charge is a shaped charge.

Claim 4

The invention of claim 1 wherein said laterally directed charge is a bullet.

Claim 5

The invention of claim 1 wherein said liquid is water.

Claim 6

The invention of claim 1 wherein said liquid is an acid.

Claim 7

The invention of claim 5 wherein said acid is selected from the group consisting of hydrochloric acid and nitric acid.

Claim 8

The invention of claim 1 wherein said liquid is a composition which liquifies at the borehole temperatures.

Claim 9

The invention of claim 1 wherein said laterally directed charge consists of a pair of diametrically opposed shaped charges.

Claim 10

A controlled directional charge adapted to be lowered into a borehole to fracture a formation comprising a hollow elongated casing, first and second vertically spaced, inwardly directed explosive charges in said casing, a plurality of vertically spaced and laterally directed shaped charges secured in said casing intermediate said first and second explosive charges and adapted to provide a perforation in the formation adjacent to each charge, a liquid filling said hollow casing intermediate said first and second charges, and detonating means for said first and second charges and said plurality of laterally directed shaped charges wherein said laterally directed shaped charges at least partially penetrate the adjacent formation at which time said first and second charges exert opposing forces on said liquid injecting a high velocity jet of said liquid into said perforations initiated by said laterally directed shaped charges.

Claim 11

A controlled directional charge adapted to be lowered into a borehole to fracture a formation comprising a hollow elongated casing, first and second vertically spaced, inwardly directed explosive charges in said casing, a plurality of vertically spaced and laterally directed shaped charges secured in said casing intermediate said first and second explosive charges and adapted to provide a perforation in the formation adjacent to each charge, a liquid filling said hollow casing intermediate said first and second charges, and detonating means for said first and second charges and said plurality of laterally directed shaped charges wherein said laterally directed shaped charges at least partially penetrate the adjacent formation at which time said first and second charges exert opposing forces on said liquid injecting a high velocity jet of said liquid into said perforations initiated by said laterally directed shaped charges.

Claim 12

A controlled directional charge adapted to be lowered into a borehole to fracture a formation comprising a hollow elongated casing, a first pair of vertically spaced, inwardly directed explosive charges in said casing, a first plurality of vertically spaced and laterally directed shaped charges secured in said casing intermediate said first pair of explosive charges and adapted to provide a perforation in the formation adjacent to each charge, a first liquid filling said hollow casing intermediate said first pair of inwardly directed explosive charges, at least a second pair of vertically spaced, inwardly directed explosive charges in said casing, a second plurality of vertically spaced and laterally directed shaped charges secured in said casing intermediate said second pair of explosive charges and adapted to provide a perforation in the formation adjacent to each charge, a Second liquid filling said hollow casing intermediate said second pair of explosive charges, and detonating means for said first and second pairs of explosive charges and said first and second plurality of shaped charges whereby said shaped charges at least partially penetrate the adjacent formation at which time said first and second pairs of explosive charges exert opposing forces on said respective first and second liquids injecting high velocity jets of said liquids into said perforations initiated by said first and second plurality of shaped charges.

Claim 13

A controlled directional charge adapted to be lowered into a borehole to fracture a formation comprising a hollow elongated casing, a first pair of vertically spaced, inwardly directed explosive charges in said casing, a first plurality of vertically spaced and laterally directed shaped charges secured in said casing intermediate said first pair of explosive charges and adapted to provide a perforation in the formation adjacent to each charge, a first liquid filling said hollow casing intermediate said first pair of inwardly directed explosive charges, at least a second pair of vertically spaced, inwardly directed explosive charges in said casing, a second plurality of vertically spaced and laterally directed shaped charges secured in said casing intermediate said second pair of explosive charges and adapted to provide a perforation in the formation adjacent to each charge, a Second liquid filling said hollow casing intermediate said second pair of explosive charges, and detonating means for said first and second pairs of explosive charges and said first and second plurality of shaped charges whereby said shaped charges at least partially penetrate the adjacent formation at which time said first and second pairs of explosive charges exert opposing forces on said respective first and second liquids injecting high velocity jets of said liquids into said perforations initiated by said first and second plurality of shaped charges.