公开(公告)号：US20230054654A1

公开(公告)日：2023-02-23

申请号：US17820894

申请日：2022-08-19

Applicant: Silixa Ltd.

Inventor： Peter Dawson ,  Veronique Mahue ,  Vu Nguyen ,  Pete Richter ,  Yinghui Wu

IPC: G01V1/50 ,  G01V1/22 ,  G01V1/52 ,  E21B49/00

Abstract: The present disclosure provides a method of processing data obtained from distributed optical fiber sensors to detect acoustic energy generated by a poroelastic effect of fractures in a structure, such as a rock formation. The sensing fiber of an optical fiber distributed sensing system may be deployed in the vicinity of the region where fracturing is occurring, for example, along a well that is offset from a treatment well undergoing hydraulic fracturing. The DAS data obtained from along the sensing fiber is processed to measure changes in the low-frequency strain caused by the poroelastic effects in the rock as the fractures open and close. This measured strain rate data is iteratively processed at each instant time to identify fracture opening features (characterised as compression-tension-compression) that are correlated with fracture closing features (characterised as tension-compression-tension) as a function of depth, to thereby identify and locate fracture hits in the vicinity of the sensing fiber.