Patent ID: 11939863
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 9:
10. A method implemented by a distributed acoustic sensing (DAS) interrogator comprising:
deploying an optical fiber attached to the DAS interrogator in a wellbore;
pre-setting gauge length of the DAS interrogator based an expected wavelength of strain signals, an expected strain distribution along the optical fiber, or pre-estimated distance of a strain source from the optical fiber;
interrogating the optical fiber using DAS interrogator;
receiving reflected DAS signals associated with the strain source along a length of the optical fiber using the pre-set gauge length;
performing an analysis to determine signal-to-noise ratio of a strain component associated with the reflected DAS signals, wherein the analysis is performed using a linear inversion of the reflected DAS signals together with a predictive model of signals from hydraulic fracture growth; and
dynamically adjusting the gauge length for at least a portion of the optical fiber within a pre-defined limit of the DAS interrogator as a function of the signal-to-noise ratio.