Method and Apparatus for Rock Hydraulic Fracturing under Resonant Excitation
AssigneesChina University of Petroleum-Beijing, STenergy LLC
InventorsBen Li, Quanjun Wang, Hui Li
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Abstract
A method and apparatus for rock hydraulic fracturing under resonant excitation are disclosed. The method includes: obtaining excitation frequency and strain time-series data of a target rock sample based on a simulated pore diameter; determining the resonant frequency under the pore diameter influence; identifying the fracture initiation pressure and orientation under the resonant frequency and a preset excitation duration; and formulating a fracture induction scheme accordingly. This approach enables accurate characterization of fracture initiation conditions and improves hydraulic fracturing performance in unconventional reservoirs.
Claims10
A method for rock hydraulic fracturing under resonant excitation, comprising:
- obtaining excitation frequency time-series data applied at a perforated end face of a target rock sample, and strain time-series data from other end faces excluding the perforated end face, based on a simulated pore diameter of the target rock sample;
- determining a resonant frequency of the target rock sample influenced by the simulated pore diameter from the excitation frequency time-series data based on the strain time-series data;
- determining a fracture initiation pressure and a fracture initiation orientation of the target rock sample based on the resonant frequency and a preset resonant excitation duration;
- formulating a fracture induction scheme based on the fracture initiation pressure and fracture initiation orientation;
- and performing hydraulic fracturing according to the fracture induction scheme.
A resonant excitation-based hydraulic fracturing apparatus, comprising:
- an acquisition module configured to obtain excitation frequency time-series data applied at a perforated end face of a target rock sample, and strain time-series data from other end faces excluding the perforated end face, based on a simulated pore diameter of the target rock sample;
- a resonant frequency determination module configured to determine a resonant frequency of the target rock sample from the excitation frequency time-series data based on the strain time-series data;
- a fracture initiation parameter determination module configured to determine a fracture initiation pressure and a fracture initiation orientation of the target rock sample under the resonant frequency and a preset excitation duration;
- and a fracturing module configured to formulate a fracture induction scheme based on the fracture initiation pressure and orientation, and to perform hydraulic fracturing accordingly.
Dependencies are inferred from the claim text.