Detonator for a perforating gun assembly
A detonator for a perforating gun. The detonator is used to ignite a detonator cord in a charge tube for a perforating gun assembly, which in turn is used for perforating a wellbore. The detonator includes a cartridge. The cartridge comprises a tubular body having a first end; and a second end. Preferably, the tubular body is fabricated from a metallic material. The detonator also comprises a post proximate the first end of the tubular body. The post is configured to be in electrical communication with a first leg wire connected to an addressable switch. Alternatively, the post is in contact with the end of a detonation pin. The detonator also has a fuse head within the bore of the tubular body, and a fuse wire. The fuse head is in contact with the explosive charge material. The detonator is releasably snapped into a compartment located within the charge tube.
1 . An end plate comprising:
a first end defining a first face, with the first face abutting a charge tube of a perforating gun;
a second end opposite the first end, and defining a second face;
an opening along the second face configured to receive an end of a ground pin;
a first through-opening and a second through-opening;
a first bulkhead residing in the first through-opening configured to closely receive a signal transmission pin, wherein the signal transmission pin is configured to transmit electrical signals from the perforating gun, through the end plate, and to an addressable switch;
a second bulkhead residing in the second through-opening configured to closely receive a detonator pin, wherein the detonator pin is configured to transmit a detonation signal from the addressable switch, back up through the end plate, and to a detonator;
and wherein:
the addressable switch comprises a first leg wire and a second leg wire; and
the detonator is received within a compartment of the charge tube within the perforating gun.
2 . The end plate of claim 1 , wherein:
the detonator comprises a terminal;
the detonator is placed within the compartment of the charge tube using a friction-fit or snap-fit arrangement;
the first leg wire is in electrical communication with the detonator pin;
the second leg wire is in electrical communication with a ground terminal in the compartment; and
placement of the detonator into the compartment causes the terminal to be in contact with the detonator pin, and a body of the detonator to be in contact with the ground terminal.
3 . The end plate of claim 2 , further comprising:
a flange residing between the first face and the second face;
and wherein:
the charge tube resides upstream from the end plate;
the charge tube extends over the first face of the end plate and abuts the flange on a first side;
a downstream tandem sub extends over the second face of the end plate and abuts the flange on a second side opposite the first side; and
the addressable switch resides within the tandem sub.
4 . The end plate of claim 2 , wherein: the first leg wire is connected to the detonator pin; and the second leg wire is connected to a ground terminal in the compartment 4 .