Method and apparatus for perforating and fracturing in a borehol

Details Method and apparatus for perforating and fracturing in a borehol Method and apparatus for perforating and fracturing in a borehol

1992-11-10

1994-10-18

Nelson, Peter A.

Ammunition and explosives

Blasting

Borehole loading

102312, 299 13, F42B 300

Patent

active

053558022

ABSTRACT:
A method and apparatus for perforating a formation surrounding a wellbore and initiating and propagating a fracture in that formation to stimulate hydrocarbon production from the wellbore. The technique uses a perforation and propellant loading device which perforates and fractures in a single operation to greatly increase the efficiency over current perforation techniques. Efficiency is increased by a number of factors including firing the perforating shaped charge through a gas zone, reducing the overall perforation damage to the formation, increasing operation speed, and increasing pressure in the area of the borehole surrounding the production zone before perforation and propagation are initiated. In accordance with the invention, the timing of the propellant ignition and charge detonation are critical to achieve the desired results.

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