Wellbore gun perforating system and method
A wellbore perforating system and method with reliable and safer connections in a perforating gun assembly is disclosed. The system/method includes a gun string assembly (GSA) deployed in a wellbore with multiple perforating guns attached to plural switch subs. The perforating guns are pre-wired with a cable having multi conductors; the multi conductors are connected to electrical ring contacts on either end of the perforating guns. The switch subs are configured with electrical contacts that are attached to the electrical contacts of the perforating guns without the need for manual electrical connections and assembly in the field of operations. The system further includes detonating with a detonator that is positioned upstream of the perforating gun. The detonator is wired to a switch that is positioned downstream of the perforating gun.
1. A perforating gun assembly method for assembling a plurality of perforating guns and a plurality of switch subs into a gun string assembly (GSA); wherein said method comprises the steps of:
(1) pre-wiring each of said plurality of perforating guns with a single cable comprising multiple conductors; said multiple conductors further comprising a through conducting wire, a ground conducting wire, and a firing wire;
(2) loading secondary explosives into perforating gun;
(3) assembling each of said plurality of switch subs with initiating devices;
(4) shipping said plurality of perforating guns and plurality of switch subs separately to a well location;
(5) attaching one of said plurality of switch subs to one of plurality of perforating guns in said gun string assembly at said well location; and
(6) repeating steps (1)-(5) until each of said plurality of perforating guns are connected to at least one of said plurality of switch subs.
2. The perforating gun assembly method of claim 1 wherein said pre-wiring step (1) is performed in a manufacturing facility.
3. The perforating gun assembly method of claim 1 wherein said assembling step (3) is performed in a manufacturing facility.
4. The perforating gun assembly method of claim 1 wherein said attaching step (5) further comprises simultaneous ballistic and electrical connections of one of said plurality of switch subs to one of plurality of perforating guns.
5. The perforating gun assembly method of claim 1 wherein said secondary explosives are shaped charges.
6. The perforating gun assembly method of claim 1 wherein said initiation device is a detonator.
7. The perforating gun assembly method of claim 1 wherein each end of said plurality of switch subs is connected to one of said plurality of perforating guns.