Patent ID: 9376903
Filing Date: 2016-06-28
CPC Classification: E21B

Claim Text:
1. A method for enhancing of forming at least one fracture having a required width r and length L in a formation having a wellbore penetrating said formation and communicating therewith through a multiplicity of perforations by providing vibrations on a resonant frequency and comprising the steps of: a) providing a pressurized fracturing fluid in said wellbore at a pressure exceeding a fracture gradient pressure of said formation; b) arranging a device for generating vibrations attached to an end of a tubing inside the wellbore in a vicinity of said perforations and consisting of an elongated cylinder and plunger connected to a pumping means; c) reciprocating upward and downward said plunger inside said elongated cylinder by pumping means such that movement of plunger compresses fracturing fluid inside said tubing and generating the repetitive pulses of vibrations every time when said plunger exits out of a top of said elongated cylinder on upward movement of said plunger due to quick release of compressed fracturing fluid into said wellbore; d) generating the repetitive pulses of vibrations on every exit of said plunger out of said elongated cylinder and said vibrations have the resonant frequency determined by the following expression: where f e) generating the repetitive pulses of vibrations having an amplitude in a range from 15.0 MPa to 35 MPa by said device for generating vibrations.