1. n. [Perforating]
A perforating charge designed to create perforations with a large-diameter entrance hole. These charges typically are used in sand control completions, in which efficient placement of the gravel pack treatment within the perforation tunnel is crucial. Altering the explosive charge design and materials creates a larger diameter entrance hole on the perforation while reducing the depth of penetration. However, gravel-pack treatments generally are applied in high-permeability formations where perforation tunnel length is less important. Wells that are to be hydraulically fractured also can benefit from larger perforations since the effective penetration is significantly increased by a high-conductivity fracture.
Alternate Form: big hole charge