US 11,835,598 B2
Magnetic field measurement cable and distributed-type well inside magnetic field measurement system
Kinzo Kishida, Kobe (JP); Ahmad Riza Ghazali, Kajang (MY); and Mohamad Faizal bin Abd Rahim, Kajang (MY)
Assigned to PETROLIAM NASIONAL BERHAD, Kuala Lumpur (MY)
Appl. No. 17/637,035
Filed by PETROLIAM NASIONAL BERHAD (PETRONAS), Kuala Lumpur (MY)
PCT Filed Aug. 21, 2020, PCT No. PCT/MY2020/050071
§ 371(c)(1), (2) Date Feb. 21, 2022,
PCT Pub. No. WO2021/034186, PCT Pub. Date Feb. 25, 2021.
Claims priority of application No. PI 2019004848 (MY), filed on Aug. 22, 2019.
Prior Publication US 2022/0283248 A1, Sep. 8, 2022
Int. Cl. G01R 33/032 (2006.01); G01R 33/025 (2006.01)
CPC G01R 33/0322 (2013.01) [G01R 33/025 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A magnetic field measurement cable comprising:
an electric cable provided at the axial part of the magnetic field measurement cable; and
an outer circumferential cable including;
a plurality of cables; and
an optical cable, wherein the plurality of cables and the optical cable being helically wound so as to surround an outer circumference of the electrical cable, and the optical cable is composed of:
an optical fiber for measuring a magnetic field at a predetermined location; and a plurality of steel wires helically wound around the outer circumference of the optical fiber so as to surround the optical fiber,
and the magnetic field measurement cable is configured to detect frequency shift of scattering light of the optical fiber placed at the predetermined location.