Optimization and Evaluation of Carbamide Composite Flooding Corrosion Inhibitor for Stimulation Well

doi:10.11885/j.issn.16745086.2021.04.29.06

Abstract

Abstract: In a western oil field, the temperature of the wellbore of a carbonamide combined flooding well can be as high as 260℃, and the partial pressure of CO₂ is expected to be 0.4 MPa. The wellbore string is facing a higher risk of corrosion. To solve the problem of wellbore corrosion, according to the characteristics of the service conditions of the wellbore of the carbonamide combined flooding huff and puff well, a set of corrosion inhibitor optimization evaluation technical process suitable for the carbonamide combination flooding huff and puff well is proposed. First, the compatibility of the preselected corrosion inhibitor is evaluated, and then the hot roll resistance is performed. Temperature test and electrochemical test, select the corrosion inhibitor with good temperature resistance and corrosion inhibition performance, and then use the high-temperature autoclave to simulate the on-site corrosion conditions to evaluate the corrosion inhibitor protection effect; finally, combining the process characteristics of the injection-simmering-production of the carbonamide combined flooding huff and puff well and the corrosive environment at different stages, the optimal injection timing of the corrosion inhibitor in the cooling stage of the simmering well is determined. The research results show that under the conditions of temperature 180℃ and CO₂ partial pressure 0.4 MPa, the optimized corrosion inhibitors XCN2-21 can reduce the corrosion rate of N80 pipes to 0.044 1 mm/a, meeting the requirements of oilfield corrosion control.

Key words: carbonamide, carbon dioxide, wellbore, corrosion and protection, corrosion inhibitor

CLC Number:

TE341

ZHAO Haiyan, YI Yonggang, YU Huiyong, LIU Zhendong, ZENG Dezhi. Optimization and Evaluation of Carbamide Composite Flooding Corrosion Inhibitor for Stimulation Well[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(4): 138-146.

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