Perforating gun loading requires experience, skill and specialized workshop fixtures. Prior to each job, the perforating system is designed to match the type of charge, shot phasing and shot density with the well’s casing and formation characteristics. Explosive products and gun carriers need to be stored properly. Trained technicians carefully load the shaped charges into the charge tubes, attaching the detonating cord and inserting the loaded charge tubes into the hollow carrier gun bodies. Extreme care must be taken to follow assembly procedures to assure reliable performance and safety. The DynaStage gun system is designed to simplify gun loading and improve safety of perforating operations.
Final assembly and rig up of the perforating string is an important step in assuring safe operations and reliable perforation performance. Wireline service company personnel need to be well trained in handling explosive materials, rig up and surface testing. The wireline must be kink-free and the surface and downhole equipment must be maintained and made up correctly. Some perforating gun initiators are susceptible to premature detonation caused by radio frequency signals, stray voltage, stray current or static electricity that may occur at a busy wellsite so certain activities may be delayed while guns are prepared. DynaEnergetics’ electronic detonator portfolio and the DynaSelect integrated switch-detonator eliminate the risk of an inadvertent initiation by use of a digital control system. No gun can detonate until it receives a specific coded signal. Thanks to the intrinsically safe Surface Tester and DynaSelect technology, the perforating string can easily be tested prior to picking up the string. It can be tested on the catwalk, in the lubricator before or after pressuring up, and anytime while run inhole.
Run In Hole
After the perforating run, wireline service company personnel need to follow proper procedures to control well pressure, to treat the string as if it still contained live explosives and to lay down tools safely without damaging equipment. The Multitronic firing panel gives positive shot indication of all initiators to assure that no explosives are retrieved to surface and the DynaStage systems improve efficiency during system rig-down because there is no debris and the gun string is easy to check to verify there are no unexploded charges.
Recovery and Recycling
With a DynaStage system the hassle and expense of recovery and recycling of perforating gun strings are eliminated. In areas that offer this service, DynaEnergetics staff can pick up the spent perforating guns for safe and environmentally-sound disposal.