Pipe String Integrity Evaluation and Water Injection Parameter Optimization for Injection Wells

doi:10.11885/j.issn.1674-5086.2020.04.24.01

Abstract

Abstract: Aiming at the integrity failure of water injection string in Tahe Oilfield, based on the oxygen corrosion mechanism model and ECE model, the corrosion prediction model of water injection string has been established and its reliability verified. The influences of injection production stage and injection parameters on the corrosion rate of water injection string have been studied, and failure criterion has been established on the basis of tensile failure criterion. The charts of the limit allowable water injection volume for water injection wells under different injection displacement and dissolved oxygen concentration have been drawn. The results show that the corrosion of water injection well string mainly occurs during the water injection stage; with the increase of water injection displacement and dissolved oxygen concentration, the corrosion rate of the string increases, the allowable limit water injection amount decreases, and the dissolved oxygen concentration has a more significant impact on the corrosion of the string. It is suggested to strengthen the deoxidization and control the water injection displacement. The research results effectively guide the optimization of on-site water injection operation system, ensure the safety production of water injection wells, and improve the comprehensive benefits of water injection and oil increase.

Key words: water injection well, corrosion, pipe string integrity, water injection parameters, Tahe Oilfield

CLC Number:

TE21

MA Guorui, XU Honglin, ZHANG Zhi, YANG Kun. Pipe String Integrity Evaluation and Water Injection Parameter Optimization for Injection Wells[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(1): 143-150.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2020.04.24.01

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2022/V44/I1/143

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