Coiled Tubing Wall Thickness Evaluation System Using Pulsed Alternating Current Field Measurement Technique

In recent years, with the exploitation of shale gas, the amount of coiled tubing has increased dramatically. Due to the harsh working environment, the wall thickness of the coiled tubing is easily thinned. In this paper, The coiled tubing wall thickness evaluation system is proposed based on the pulsed alternating current field measurement technique. The coiled tubing wall thickness evaluation model using pulsed alternating current field is developed by the finite element software COMSOL. The
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signal is selected as the characteristic signal of thickness evaluation, and the relationship between characteristic signal and wall thickness is analyzed. According to the detection characteristics of the coiled tubing, probe and system for the wall thickness evaluation of the coiled tubing are designed and established. And the test experiment is carried out on different thicknesses of coiled tubing. The test results show that the detecting system can quantitatively evaluate the wall thickness of the coiled tubing accurately.