Cluster gun system
A method and apparatus for containing one or more shaped charges in a single plane, arrayed about the center axis of a gun body, and detonated from a single initiator in a shaped charge cluster assembly.
1. A perforating gun assembly comprising:
a first cylindrical portion having a center axis with an outer surface, a protruding distal end having a first thru hole, a conical shaped end having a second thru hole, and at least one first half shaped charge receptacle;
a second cylindrical portion along the center axis and proximate to the first cylindrical portion, having a second outer surface, a thru hole, and a conical shaped end, and at least one second half shaped charge receptacle;
a threaded cylindrical interface at the protruding distal end of the first cylindrical portion wherein the threaded cylindrical interface has a common axis with the center axis and includes the second thru hole located therethru; and
a plurality of shaped charges, each having an apex end and an output end, arrayed about the center axis in a plane orthogonal to the center axis within the first half shaped charge receptacle and second half shaped charge receptacle, with each apex end located tangential to the center axis and a detonator located along the center axis and proximate to the plurality of shaped charges.
2. The perforating gun assembly of claim 1 further comprising a contact retainer nut coupled to the threaded cylindrical interface.
3. The perforating gun assembly of claim 2 further comprising a contact pin, having a substantially cylindrical shaped body and disposed partially within the thru hole, protruding from the threaded cylindrical interface, and restrained by the retainer nut.
4. The perforating gun assembly of claim 3 further comprising a spring located within the thru hole and loading the contact pin against the retainer nut.
5. The perforating gun assembly of claim 4 further comprising a contact strap passing over the first cylindrical portion and the second cylindrical portion and coupling to the spring disposed within the first thru hole and the conical shaped end of the second cylindrical portion.
6. The perforating gun assembly of claim 1 further comprising a booster holder, having a substantially cylindrical shaped body and disposed partially within the second thru hole of the second cylindrical portion.
7. The perforating gun assembly of claim 1 wherein the at least one shaped charge is a plurality of shaped charges arrayed about the center axis of the first cylindrical portion.
8. The perforating gun assembly of claim 1 wherein at least one shaped charge is adapted to perforate in a plane orthogonal to the center axis.
9. A method for loading a perforating gun comprising:
combining a first cylindrical half with a second cylindrical half to form a perforating first shaped charge cluster;
installing at least one shaped charge into the first shaped charge cluster; and
installing the first shaped charge cluster into a perforating gun body, wherein the first shaped charge cluster is snapped together using a plurality of tabs.
10. The method of claim 9 , wherein the gun body is coupled to a first tandem containing a detonator.
11. The method of claim 9 , wherein the first shaped charge cluster is coupled to a second shaped charge cluster.
12. The method of claim 11 , further comprising electrically coupling the first end of the first shaped charge cluster to the second end of the second shaped charge cluster.
13. The method of claim 9 , further comprising coupling a contact piston, spring, and retainer nut to a first end of the first shaped charge cluster.
14. The method of claim 9 , further comprising lowering the perforating gun into a wellbore.
15. The method of claim 14 , further comprising perforating a first perforation plane orthogonal to the wellbore.
16. The method of claim 15 , further comprising fracturing the first perforation plane orthogonal to a wellbore.