Patent ID: 6397947
Filing Date: 2002-06-04
Classification: E21B

Abstract:
A method comprising:a. arranging shaped charges in a perforating gun to produce perforation holes in a helical pattern that is defined in part by a phase angle, the helical pattern including first, second and third windings; b. determining a first distance between a first one of the perforation holes of the first winding and a second one of the perforation holes of the first winding; c. determining a second distance between said first one of the perforation holes and a third one of the perforation holes of the second winding; d. determining a third distance between the second and third perforation holes; e. determining a fourth distance between the first perforation hole and a fourth one of the perforation holes of the third winding; f. changing the phase angle and repeating acts b, c, d and e as required until two of the first, second, third and fourth distances are approximately equal; and g. phasing the shaped charges using approximately the phase angle that causes said two of the first, second, third and fourth distances to be approximately equal.