Patent ID: 8770301

Claim:
A method of arming an explosive well tool comprising the steps of: providing an axially elongated firing head housing having first mechanical assembly means at one end thereof: securing an explosive detonator means to said housing to project axially beyond said one end of said housing; enclosing said detonator means by a detonator cover of sufficient structural integrity to confine a detonation of said detonator means; securing said detonator cover to said housing by said first assembly means: providing operating signal contact means at an opposite axial end of said housing; providing a capacitive firing cartridge connected electrically between said signal contacts and said detonator means; delivering said housing to a well site with said firing cartridge connected to said signal contact means and to said detonator means and said detonator cover enclosing said detonator means and secured to said first assembly means; at said well site, with said detonator cover secured to said first assembly means, securing signal carrier means to said opposite end of said housing for signal continuity with said signal contact means; removing said detonator cover means from said housing; and, connecting an explosive well tool to said housing at said one end by said first assembly means.