Patent ID: 6491098
Filing Date: 2002-12-10
Classification: E21B

Abstract:
An apparatus for perforating and stimulating subterranean wells comprising:a) a perforating gun for perforating a well casing, the perforating gun being adapted for connection of a tubing string and including a fluid passage to permit well stimulation fluid to be pumped therethrough without affecting a functionality of components of the perforating gun; and b) an injection nozzle connected to a second end of the perforating gun in fluid communication with the fluid passage for injecting pressurized stimulation fluid into a production zone through perforations made through a casing of the well by the perforating gun, the injection nozzle including an axial passage having a check valve to permit fluid in the well below the annular seal to flow up through the nozzle when the apparatus is inserted into the well, while inhibiting the pressurized stimulation fluid from flowing through the nozzle into the section of the casing below the apparatus; and c) an annular seal for sealing an annulus between the apparatus and the well casing to prevent the pressurized stimulation fluid from flowing into the casing below the apparatus.