Constant entrance hole perforating gun system and method

A shaped charge for use in a perforating gun, said charge comprising:

• a case,
• a liner positioned within said case, and
• an explosive filled between said case and said liner;
• said liner configured with a subtended angle about an apex of said liner;
• said liner having an exterior surface, said exterior surface substantially straight and conically tapered to form said apex;
• and
• said subtended angle of said liner ranges from 100° to 120°.

A stage perforation method using a perforating gun system in a wellbore casing the method comprising the steps of:

• (1) setting up a plug and isolating a stage in the casing;
• (2) targeting an entrance hole diameter of said entrance hole;
• (3) selecting an explosive load, a subtended angle, a radius and an aspect ratio for each charge of a plurality of charges, each of said plurality of charges being configured to create an entrance hole in said casing, each of said plurality of charges are configured with a liner having a subtended angle about an apex of said liner, said liner having an exterior surface, said exterior surface substantially straight and conically tapered to form said apex, said subtended angle of said liner ranges from 100° to 120°, and a variation of diameters of entrance holes created with said plurality of charges is configured to be less than 7.5%;
• (4) positioning said plurality of charges in said well casing;
• (5) perforating with said plurality of charges into a hydrocarbon formation;
• (6) creating said entrance hole with said entrance hole diameter and completing said stage;
• and
• (7) pumping fracture treatment in said stage at a designed rate without substantially adjusting pumping rate.

A shaped charge for use in a perforating gun, said charge comprising:

• a case,
• a liner positioned within said case, and
• an explosive filled within said liner;
• said liner configured with a subtended angle about an apex of said liner such that a jet formed with said explosive creates an entrance hole in a well casing;
• said subtended angle of said liner ranges from 100° to 120°;
• and
• said liner not substantially shaped elliptically, oval, or, semi-oval.