Externally-orientated internally-corrected perforating gun system and method
View Patent ↗A perforating gun comprising an elongated shaped scallop that is cut circumferentially in an outside surface of the perforating gun such that said scallop has a constant thickness portion and a variable thickness portion. The variable thickness portion is cut on either end of the constant thickness portion and an arcuate length of the constant thickness portion subtends an angle at a center of said perforating gun. The elongated shaped scallop aligns to shaped charges that are oriented along a desired perforating orientation in the perforating gun. During perforating, the shaped charges perforate through the elongated shaped scallop such that a burr created by the plural shaped charges does not substantially protrude past an outside diameter of the perforating gun.
1. A perforating gun for use in a wellbore casing, comprising an elongated shaped scallop extending circumferentially within an outside wall of said perforating gun such that said scallop has a constant thickness portion and a variable thickness portion in said outside wall; said variable thickness portion configured on either end of said constant thickness portion; an end of said variable thickness portion configured with a thickness substantially equal to a thickness of said wall; an arcuate length of said constant thickness portion subtending an angle at a center of said perforating gun; said elongated shaped scallop is configured to align to plural shaped charges in said perforating gun; said plural shaped charges are configured to orient along a desired perforating orientation;
wherein
when perforating, said plural shaped charges perforate through said elongated shaped scallop such that a burr created by said plural shaped charges does not substantially protrude past an outside diameter of said perforating gun.
2. The perforating gun of claim 1 wherein a thickness of said constant thickness portion ranges from 0.05 inches to 0.75 inches.
3. The perforating gun of claim 2 wherein said thickness is 0.125 inches.
4. The perforating gun of claim 1 wherein a width of said constant thickness portion ranges from 0.25 inches to 2 inches.
5. The perforating gun of claim 4 wherein said width is 1.25 inches.
6. The perforating gun of claim 1 wherein said angle is 45 degrees.
7. A perforating gun for use in a wellbore casing, comprising an elongated shaped scallop extending circumferentially within an outside wall of said perforating gun such that said scallop has a constant thickness portion and a variable thickness portion in said outside wall; said variable thickness portion configured on either end of said constant thickness portion; an end of said variable thickness portion configured with a thickness substantially equal to a thickness of said wall; an arcuate length of said constant thickness portion subtending an angle at a center of said perforating gun.
8. The perforating gun of claim 7 wherein a thickness of said constant thickness portion ranges from 0.05 inches to 0.75 inches.
9. The perforating gun of claim 8 wherein said cut thickness is 0.125 inches.
10. The perforating gun of claim 7 wherein a width of said constant thickness portion ranges from 0.25 inches to 2 inches.
11. The perforating gun of claim 10 wherein said width is 1.25 inches.
12. The perforating gun of claim 7 wherein said angle is 45 degrees.