Acid Gas Injection Technologies for High-Sulfur Oil Well —A Case Study on Oil Well in Shunbei Well Area

Author of the article:Ye Fan1, Wang Shouxi2, Yao Lirong1, Quan Qing2, Wang Chen2, Wang Suwen2

Author's Workplace：1. Institute of Engineering Technology, Sinopec Northwest Oilfield Company;2.2. College of Petroleum Engineering, Xi’an Shiyou University

Key Words：Acid gas injection; Formation; Wellbore; Process analysis

Abstract：Acid gas injection (AGI) technology has gradually become an economical, environmental friendly and efficient acid gas treatment method.For this reason, a case study of high-sulfur oil well of the Erhaolian in Shunbei well area AGI project is presented. Based on evaluation of acid gas component and reinjection condition, the principles, procedures, methods and considerations in the selection of the injection formation is revealed.The results show that the reinjection formation and required wellhead reinjection pressure should be taken into account first.Geological factors and non-geological factors are the main factors in the selection of geological reinjection formation.The principle of phase equilibrium should be utilized in the formulation of AGI technology to fully dehydrate to prevent corrosion and hydrate formation.In addition to the basic design, the selection of compressor should also prevent acid gas from condensation between stages and corrosion.Finally, ordovician formation was selected as the reinjection formation, and source boosting and four-level boosting were adopted to realize AGI.