Features of the impact of high-amplitude short pulses of hydrodynamic pressure on perforation channels

Abstract

The features of the impact of high-amplitude short pressure pulses on perforation channels in the bottomhole zone of the well are analyzed. It is shown that in the channels formed in the rock with the use of cumulative perforation and having a conical shape, there is an increase in pressure pulses when a certain condition is fulfilled, which limits the duration of this pulse. It has been established that in the negative phase of the pressure pulse, destruction of the cured rock layers adjacent to the walls of the perforation channel can occur, which improves the filtration-capacitive properties of the bottomhole zone of the well. It is shown that when using explosive charges of low mass, pressure pulses are formed with parameters similar to those of pulses generated by electric discharges in the wellbore. To apply the technology of explosive action with low-mass charges on the bottomhole zone, the standard equipment used for cumulative perforation of wells can be used. A method for screening pressure pulses is proposed, which increases the effectiveness of their impact on the bottomhole zone of the well and simultaneously reduces the excessive load on the casing pipes above the productive formation. Keywords: bottomhole zone of a well; perforation channels; electric discharge impact; low-mass charges; reflecting screen.