Abstract

A system and method of multi-stage hydraulic fracturing is disclosed for medium to deep underground rock masses, wherein for a first stage of fracturing, a first fracturing water drive pump is connected to the water injection head; this is low-flowrate and high-pressure, to ensure the rupture of the rock mass; in successive second or third stages at least one second and third pump with a greater flowrate and a lower pressure than the first pump, connected to the water injection head, enable the propagation of the hydraulic fracture to be maintained. With this invention, fracturing is ensured, preventing pillars from remaining in the formation, achieving the fracturing with a lesser requirement of electrical power, enabling the generation of progressive propagation, generated in successive stages, such that less power is required; and furthermore, a dynamic modality is employed in the inflation of the packers that enables the obtaining of a longer life of these elements, achieving greater operational efficiency.

IPC Classes  ?

• E21C 45/00 - Methods of hydraulic miningHydraulic monitors
• E21C 45/04 - Means for generating pulsating fluid jets by use of highly pressurised liquid
• E21C 37/06 - Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole