Casing pipe damage detection with optical fiber sensors: a case study in oil well constructions

Zhi Zhou; Jianping He; Minghua Huang; Jun He; Jinping Ou; Genda Chen

doi:10.1117/12.848727

8 April 2010 Casing pipe damage detection with optical fiber sensors: a case study in oil well constructions

Zhi Zhou, Jianping He, Minghua Huang, Jun He, Jinping Ou, Genda Chen

Proceedings Volume 7649, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2010; 764908 (2010) https://doi.org/10.1117/12.848727
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

Abstract

Casing pipes in oil well constructions may suddenly buckle inward as their inside and outside hydrostatic pressure difference increases. For the safety of construction workers and the steady development of oil industries, it is critically important to measure the stress state of a casing pipe. This study develops a rugged, real-time monitoring, and warning system that combines the distributed Brillouin Scattering Time Domain Reflectometry (BOTDR) and the discrete fiber Bragg grating (FBG) measurement. The BOTDR optical fiber sensors were embedded with no optical fiber splice joints in a fiber reinforced polymer (FRP) rebar and the FBG sensors were wrapped in epoxy resins and glass clothes, both installed during the segmental construction of casing pipes. In-situ tests indicate that the proposed sensing system and installation technique can survive the downhole driving process of casing pipes, withstand a harsh service environment, and remain in tact with the casing pipes for compatible strain measurements. The relative error of the measured strains between the distributed and discrete sensors is less than 12%. The FBG sensors successfully measured the maximum horizontal principal stress with a relative error of 6.7% in comparison with a cross multi-pole array acoustic instrument.

Citation Download Citation

Zhi Zhou, Jianping He, Minghua Huang, Jun He, Jinping Ou, and Genda Chen "Casing pipe damage detection with optical fiber sensors: a case study in oil well constructions", Proc. SPIE 7649, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2010, 764908 (8 April 2010); https://doi.org/10.1117/12.848727

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