About some physico-mechanical aspects of the technology of cumulative perforation of wells
UDC: 622.245.142.3
DOI: -
Authors:
SVALOV ALEXANDER M.
1
1 Oil and Gas Research Institute Russian Academy of Sciences, Moscow, Russia
Keywords: cumulative perforation, deformation processes in rock, double shaped charges, hydrodynamic pressure pulses, low-mass charges
Annotation:
The paper presents the results of an analysis of the possibilities of improving the efficiency of the technology of cumulative perforation of wells, the most widely used for secondary opening of formations.
It is established that with a decrease in reservoir pressure in the developed deposit, a significant displacement of perforation channels in the bottomhole zones of wells relative to the holes in the casing pipes can occur. In order to reduce the negative impact of such a displacement on the hydrodynamic connection of the productive formation with the borehole, after evaluating its potential value, it is proposed to use double shaped charges for perforating at least the bottom part of the formation. To increase the depth of the formation opening, it is proposed to install these charges at a certain angle to each other.
It is shown that low-mass explosive charges placed along the perforated interval of the productive formation can be used to effectively affect the existing system of perforation channels. To repeatedly reflect pressure pulses and protect the upstream part of the borehole from excessive loads, metal discs of sufficiently small thickness installed in the upper part of the perforation system can be used.
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