The results indicate that the final lengths of fractures generated by single pulse HEGF can be extended with the increase of the perforation density, the diameter of perforation holes, the thickness of propellant column and the total propellant quality.
For simplicity, the average perforation density of each case is 2 shots/m.
The large variability of the permeances of the microperforated films is due to the heterogeneity of perforation density and diameter.
And among all these techniques, perforation completion, including variable density perforation and selectively perforated completion, plays a critical role in alleviating water cresting (Pang et al. 2012).
By using this model, we mainly examine the impact of horizontal stress difference, number and spacing of perforation clusters, injection rate, and density of natural fractures on fracture patterns.
Three patterns of perforations are studied.
The influence of horizontal stress difference, number and spacing of perforation clusters, injection rate, and the linear density of natural fractures on fracture propagation has been studied with this model.
In this simulation, the linear density of the natural fractures is 0.12 m/m2, the number of the perforation clusters is 4, the perforation cluster spacing is 20 m, and the injection rate is 15 m3/min.
Empty lattice sandwich panels with an areal density of 27.7 kg m−2 do not prevent the perforation of the sandwich panel.
In this study, we demonstrate up to 30% increase in power density of carbon paper electrodes for vanadium redox flow batteries (VRFB) by introducing perforations into the structure of electrodes.
The free recovery response of the polymer stents at body temperature was studied as a function of glass transition temperature (Tg), crosslink density, geometrical perforation, and deformation temperature, all of which can be independently controlled.
