Safe Perforating Unaffected by Radio and Electric Power

Abstract

ABSTRACT Radio transmission, radar, electric welding, cathodic protection, and electric generators, motors and their connections can create an unsafe environment for certain operations using explosives. Transporting and arming electrically initiated explosive perforating devices in this environment can be hazardous. A premature detonation can occur if correct procedures are not followed. The procedures required to prevent premature detonation often include the interruption of radio and microwave transmission, welding operations and cathodic protection systems. These shutdowns are costly and cause operational and logistical difficulties and may pose new safety problems. This problem is especially acute when operating offshore or in highly congested urban areas. The paper briefly reviews perforating equipment and operations and identifies the potential hazards of transporting and arming explosive devices in the previously described environment. The present safety procedures and equipment are discussed, along with a detailed analysis of the problems and the procedures used to allow limited radio silence. A new method of initiating perforating guns is described that is based on the principle of a foil, subjected to a large electric power burst, slapping a secondary explosive and a safe and arm system that totally eliminates the need for radio silence. Electric welding, cathodic protection and other electric equipment can also be operated without interruption. SECTION 1 - RADIO AND ELECTRIC POWER INSTALLATIONS AFFECTING PERFORATING