clean tunnels this results in a significant improvement in clear tunnel depth and therefore in production performance in some cases reperforation with reactive perforating systems has resulted in a more than ten fold productivity increase in one case re perforation of a gas well that had historically never produced more than 0 5 mmscf d despite several remedial interventions led to a flow rate in excess of 4 mmscf d and has followed a normal decline curve during its early production life even though the figures described above have depicted all of the explosive charges as having uniform size it is understood by those skilled in the art that depending on the specific application it may be desirable to have different sized explosive charges in the perforating gun it is also understood by those skilled in the art that several variations can be made in the foregoing without departing from the scope of the invention for example the particular location of the explosive charges can be varied within the scope of the invention also the particular techniques that can be used to fire the explosive charges within the scope of the invention are conventional in the industry and understood by those skilled in the art it will now be evident to those skilled in the art that there has been described herein an improved perforating gun that reduces the amount of debris left in the perforations in the hydrocarbon bearing formation after the perforating gun is fired without the need for the underbalance induced surge flow typically used to clear debris from perforation tunnels although the invention hereof has been described by way of preferred embodiments it will be evident that other adaptations and modifications can be employed without departing from.