US 11,754,462 B2
Method and system for detecting events in a conduit
Arne Dankers, Calgary (CA); and Seyed Ehsan Jalilian, Calgary (CA)
Assigned to HIFI ENGINEERING INC., Calgary (CA)
Appl. No. 17/299,302
Filed by Hifi Engineering Inc., Calgary (CA)
PCT Filed Dec. 2, 2019, PCT No. PCT/CA2019/051731
§ 371(c)(1), (2) Date Jun. 2, 2021,
PCT Pub. No. WO2020/113322, PCT Pub. Date Jun. 11, 2020.
Claims priority of provisional application 62/774,624, filed on Dec. 3, 2018.
Prior Publication US 2022/0050007 A1, Feb. 17, 2022
Int. Cl. G01M 3/38 (2006.01); E21B 47/117 (2012.01)
CPC G01M 3/38 (2013.01) [E21B 47/117 (2020.05)] 33 Claims
OG exemplary drawing
 
1. A method of detecting events in a conduit, comprising:
using multiple lengths of optical fiber positioned alongside a conduit to detect a signal;
for each length of optical fiber, obtaining interferometric data from the detected signal;
comparing the interferometric data obtained for one length of optical fiber to the interferometric data obtained for one or more other lengths of optical fiber; and
determining, based on the comparison, whether the signal originated from the conduit
wherein:
comparing the interferometric data comprises determining when each length of optical fiber detected the signal;
determining whether the signal originated from the conduit is further based on when each length of optical fiber detected the signal, and on relative positions of the lengths of optical fiber;
determining whether the signal originated from the conduit comprises determining that a first length of optical fiber detected the signal before one or more other lengths of optical fiber; and
the first length of optical fiber is closer to the conduit than the one or more other lengths of optical fiber.