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Effects of pH Buffer on the Corrosion Behavior of C110 Tubing in Formate Completion Fluid With the Mix of CO2 at High Temperature

Picture for Effects of pH Buffer on the Corrosion Behavior of C110 Tubing in Formate Completion Fluid With the Mix of CO2 at High Temperature
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Recently several localized corrosion and cracking failures happened to API 5CT Grade C110 tubing in high-density formate completion fluid at high temperature because of the leakage of CO2 and the mechanical damage on the tubing surface. In this paper the hydrochemical simulation software is used to calculate the needed content of pH buffer. The corrosion behavior of C110 tubing is investigated by autoclave scanning electron microscopy (SEM) energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The results show that 1% Na2CO3 and 1%NaHCO3 can maintain the pH of formate completion fluid with the mix of 3 MPa CO2 up to 6.35 which means CO2 corrosion restrained effectively. The simulated experiments show that the general corrosion rate of C110 tubing decreases from 0.49 mm/a to 0.24 mm/a and the C110 tubing have little localized corrosion and cracking susceptibility in formate completion fluid when buffered with 1% Na2CO3 and 1%NaHCO3. The results of XRD and SEM-EDS indicate that the pH buffer is helpful to general compact and effective FeCO3 corrosion product film.

Product Number: 51319-13354-SG
Author: Zhiwen Yang
Publication Date: 2019
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