Patent ID: 9243495
Filing Date: 2016-01-26
CPC Classification: E21B,E21C

Claim Text:
1. A tool for use in initiating a hydraulic fracture in a bore hole, comprising an elongate cylindrical bore hole packer structure having an inner longitudinal passage, a mid-portion provided with one or more ports extending outwardly from said passage to the exterior periphery of the packer structure and expandable circumferential wall portions surrounding the inner longitudinal passage to each side of the mid-portion whereby in use of the tool the circumferential wall portions can be expanded by injection of hydraulic fracturing fluid into said passage and exit of the injected fluid through the port or ports to produce a pressure difference between the inside of the packer structure and the outside of the packer structure as the fluid passes through the port or ports such that the fluid exiting the packer structure can initiate a fracture, and wherein the port or each port is provided by a metal insert set into the mid-portion of the packer structure.