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A shaped charge explosive device is provided having a front, a rear and an axis of symmetry with the device comprising an explosive charge, a liner lining a front of the explosive charge, the liner having a recess in the form of a groove encircling the axis of symmetry; and the groove arranged to pr

A shaped charge explosive device is provided having a front, a rear and an axis of symmetry with the device comprising an explosive charge, a liner lining a front of the explosive charge, the liner having a recess in the form of a groove encircling the axis of symmetry; and the groove arranged to provide an axis of projection for the liner at an angle A relative to the axis of symmetry. A method of cutting a structure is provided comprising the steps of providing the foregoing device, detonating the explosive charge to create a detonation wave; forming the liner into an formed projectile in the shape of an annular ring with the detonation wave; directing the formed projectile towards the structure; and forming an annular ring cut pattern in the structure with the formed projectile.

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1. A shaped charge device having a front, a rear and an axis of symmetry, the device comprising: an explosive charge;a liner lining a front of the explosive charge, the liner having a recess in the form of a groove encircling the axis of symmetry; andthe groove arranged to provide an axis of project

1. A shaped charge device having a front, a rear and an axis of symmetry, the device comprising: an explosive charge;a liner lining a front of the explosive charge, the liner having a recess in the form of a groove encircling the axis of symmetry; andthe groove arranged to provide an axis of projection for the liner at an angle relative to the axis of symmetry, wherein the angle is in the range of 1 degree to 45 degrees; anda core plug; andwherein the explosive charge arranged to form the liner into a jet ring upon detonation of the shaped charge device to form a ring shaped cut pattern in a structure contacted by the jet ring, and, after the jet ring has formed the ring shaped cut pattern, impact a portion of the structure within the ring shaped cut pattern with the core plug. 2. The device of claim 1 wherein: the axis of projection diverges along the axis of symmetry from the rear of the device towards the front of the device. 3. The device of claim 1 wherein: the groove has an apex angle; andthe apex angle is in the range of 20 degrees to 140 degrees. 4. The device of claim 1 wherein: the groove is V-shaped. 5. The device of claim 1 wherein: the groove is circular. 6. The device of claim 1 wherein: the groove is polygonal. 7. The device of claim 1 wherein: the groove is defined by an outer wall portion of the liner and an inner wall portion of the liner relative to the axis of symmetry;the outer wall portion converges along the axis of symmetry from the front of the device towards the rear of the device; andthe inner wall portion diverges along the axis of symmetry from the front of the device towards the rear of the device. 8. The device of claim 7 wherein: the outer wall portion is frusto-conical; andthe inner wall portion is frusto-conical. 9. The device of claim 7 wherein: the outer wall portion is planar; andthe inner wall portion is planar. 10. The device of claim 1 wherein: the liner has a circular periphery; andthe groove extends to the circular periphery of the liner. 11. The device of claim 1 wherein: the liner has a polygonal periphery; andthe groove extends to the polygonal periphery of the liner. 12. The device of claim 1 wherein: the liner comprises metal. 13. The device of claim 1 wherein: the explosive charge is arranged to form the liner into a formed projectile in the shape of an annular ring upon a detonation thereof. 14. The device of claim 13 wherein: the annular ring is circular. 15. The device of claim 1 wherein: the annular ring is polygonal. 16. The device of claim 1 wherein: the explosive charge comprises an organic nitrate explosive. 17. The device of claim 1 further comprising: the core plug provides at least one surface which opposes a surface of an outer casing to provide a symmetrical annular shape to the explosive charge. 18. The device of claim 1 wherein: the core plug is encircled by the explosive charge. 19. The device of claim 18 wherein: the core plug is covered by a disc shaped portion of the liner. 20. The device of claim 1 further comprising: a detonator located to a rear of the explosive charge. 21. The device of claim 1 further comprising: a casing located to a rear of the explosive charge. 22. The device of claim 21 wherein: the casing is circular. 23. The device of claim 21 wherein: the casing is polygonal. 24. The device of claim 21 wherein: the casing and liner form an enclosed tubular channel.