Apparatus and method for inserting and retrieving a tool string through well surface equipment

A system for sealing a detonating cord path of a tool subsequent to the detonation of the detonating cord, the system comprising:

• a barrier preventing fluid communication through the detonating cord path;
• the detonating cord including a first and a second section;
• the detonating cord first section disposed on one side of the barrier and the detonating cord second section disposed on the other side of the barrier;
• wherein a detonating wave that is carried along the detonating cord is transferred by the barrier from the detonating cord first section to the detonating cord second section without rupturing the barrier.

A system comprising:

• a main structure having a first segment with a first diameter and a second segment with a second diameter, the second diameter smaller than the first diameter;
• a passage defined in the first segment;
• a first detonating cord portion extending through the passage;
• a conduit extending from the passage and external to the second segment of the main structure;
• a second detonating cord portion extending through the conduit, wherein the conduit is broken apart after initiation of the second detonating cord;
• and
• a seal to engage an outer surface of the second segment after the conduit is broken apart to block fluid communication outside the main housing.