Detonation Transfer System

An apparatus for use downhole comprising:

• a single piece cylindrical housing having a common axis, a first end, a second end, a housing length and a housing diameter, further comprising:
• a first bore of a first diameter extending a first length along the common axis from the first end into the housing and having a flat bottom;
• a second bore of a second diameter extending a second length along the common axis from the second end into the housing and having a frusto-conical end within the cylindrical housing;
• a third bore of a third diameter extending a third length along the common axis from the second end into the housing and having a flat bottom;
• a fourth bore of a fourth diameter extending a fourth length along the common axis from the first end into the housing and having a flat bottom;
• a fifth bore of a fifth diameter extending a fifth length along the common axis from the first end into the housing and having a flat bottom;
• and
• a thru hole along the common axis from the flat bottom of the third bore to the flat bottom of the first bore.

A system for perforating a wellbore comprising:

• a string conveyed downhole on tubing with a distal end, further comprising:
• a firing head with a first end coupled to the distal of the tubing and a second end having a top sub with a first end coupled to the second end of the firing head and a second end;
• a first perforating gun with a first end coupled to the top sub and a second end;
• a first delay housing further comprising a single piece cylindrical housing having a common axis, a first end, a second end, and a housing length and a housing diameter, a first bore of a first diameter extending a first length along the common axis from the first end into the housing and having a flat bottom, a second bore of a second diameter extending a second length along the common axis from the second end into the housing and having a drill point bottom, a third bore of a third diameter extending a third length along the common axis from the second end into the housing and having a flat bottom, a thru hole along the common axis from the flat bottom of the third bore to the flat bottom of the first bore, wherein the first end of the first delay housing is coupled to the second end of the first perforating gun and a second end, wherein the first delay housing further comprises a firing pin located in the fourth bore, a percussion igniter in the first bore, and a delay fuse slideably engaged in the third bore, and
• a second perforating gun with a first end and a second end, wherein the first end of the second perforating gun is coupled to the second end of the delay housing.

A system for perforating a wellbore comprising:

• a string conveyed downhole on tubing with a distal end, further comprising:
• a firing head with a first end coupled to the distal of the tubing and a second end having a top sub with a first end coupled to the second end of the firing head and a second end;
• a first perforating gun with a first end coupled to the top sub and a second end;
• a first delay housing further comprising a common axis, a first cylindrical portion with a first distal end, a first outer surface, and a first diameter, a second cylindrical portion with a second distal end, a second outer surface, and a second diameter, a third portion, located between and integral with the first cylindrical portion and the second cylindrical portion whereby the first cylindrical portion, the second cylindrical portion, and the third cylindrical portion are axially aligned about the common axis, and having a third outer surface and a third diameter, a first cylindrical cavity located within and axially aligned with the first cylindrical portion, a second cylindrical cavity located within and axially aligned with the second cylindrical portion, wherein the first cylindrical cavity is adapted to house a firing pin assembly and a percussion initiator, the second cylindrical cavity is adapted to house a delay fuse, wherein the first cylindrical cavity contains a firing pin and a percussion igniter, and the second cylindrical cavity contains a delay fuse;
• and
• a second perforating gun with a first end and a second end, wherein the first end of the second perforating gun is coupled to the second end of the delay housing.