Research on Monitoring Method of Cement Curing State Outside Steel Pipe Using Electromagnetic Ultrasonic SH Guided Waves

doi:10.3901/JME.2024.02.036

Abstract

Abstract: Steel pipe-cement (SC) cemented structure is widely used in industry, in which the cementing quality of SC can directly affect the service safety of the structure. Ultrasonic testing technology is the most important method to evaluate the cementing quality of SC. However, most of the current studies are devoted to the detection of cementing defects after cement curing, and pay less attention to the curing process which can directly affect the final quality of cement. On this basis, a method for monitoring the curing state of cement outside the steel pipe based on electromagnetic ultrasonic SH guided waves is proposed. This method relies on the sensitivity of SH guided waves to the shear characteristics of cement outside the steel pipe, and determines the shear characteristics of cement outside the steel pipe by measuring and calculating the attenuation of received signals’ amplitude at different positions, so as to monitor its curing state. Firstly, the dispersion equation of the circumferential SH (CSH) guided waves of the steel pipe is established and the dispersion curves are plotted. The Electromagnetic Acoustic Transducers (EMATs) are designed according to the selected excitation frequency. Secondly, the finite element models of the steel pipe without cement coating and with cement sheath outside are established in COMSOL, and the propagation and attenuation of SH guided waves in the cement layer are studied by comparison. Finally, the electromagnetic ultrasonic monitoring system is built and the cement is prepared to carry out the simulation monitoring experiment. The results of the experiment and simulation show that the attenuation of SH guided waves is small in the steel pipe without cement coating and the propagation distance is long. However, the attenuation in the steel pipe with cement sheath is obvious, and it increases with the cement curing process. Therefore, the sensitivity of the SH guided waves to the shear characteristics of the cemented medium outside the steel pipe is verified, and the feasibility of using the SH guided waves to monitor the curing state of the cement outside the steel pipe under uncoupling condition is demonstrated.

Key words: EMAT, SH guided waves, steel pipe-cement cemented structure, cement curing monitoring

CLC Number:

TG156

YIN Xiaokang, ZHU Pengfei, ZHAO Yusheng, SHAO Xinyu, SHI Kunsan, ZHANG Hongyuan, LI Wei. Research on Monitoring Method of Cement Curing State Outside Steel Pipe Using Electromagnetic Ultrasonic SH Guided Waves[J]. Journal of Mechanical Engineering, 2024, 60(2): 36-49.

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