Abstract
A series of corrosion problems caused by high-temperature, high-pressure and high-acid gas environments has been an issue in oil and gas production for a long time. During the development of a high-acid gas field, the petroleum pipe is subjected to many aspects of corrosion, and the corrosion mechanism is complicated by the condition of the coexistence of H2S/CO2. Based on the study of the corrosion problem associated with the formate packer fluid in Southwest China, three kinds of steels were studied for corrosion prevention in the alloy G3/N80 steel/TP110SS steel. The study shows that the corrosion rate of the formate packer fluid is low, but corrosion is severe in environments characterized by high temperatures, high pressures and high-acid gas contents. Based on the consideration of cost and the difficulty of realization, an anti-corrosion system was constructed based on the existing packer fluid, mainly through the introduction of a variety of anti-corrosion additives. Through the selection of various additives and corrosion experiments, a corrosion protection system of formate packer fluid was developed. Corrosion tests show that the corrosion rate of the system must be less than 0.076 mm yr−1 to achieve the purpose of corrosion protection. The formate packer fluid with corrosion protection can meet the needs of the current application.
Highlights
High acid gases such as in Puguang and Yuanba in northeastern Sichuan are undergoing largescale development
The evaluation and optimization of formate packer fluid was mainly based on the corrosion characteristics of the base fluid of the existing formate packer fluid under the condition of high temperature, high pressure and high acid gas to analyse the corrosion mechanism and optimization mechanism
This study introduces a corresponding adjusted treatment, evaluates the corrosion effect under different conditions, and constructs a formate packer fluid system that can meet the user requirements under the conditions of high temperature, high pressure, high CO2 and high H2S content
Summary
High acid gases such as in Puguang and Yuanba in northeastern Sichuan are undergoing largescale development (table 1). The evaluation and optimization of formate packer fluid was mainly based on the corrosion characteristics of the base fluid of the existing formate packer fluid under the condition of high temperature, high pressure and high acid gas to analyse the corrosion mechanism and optimization mechanism. Based on these mechanisms, this study introduces a corresponding adjusted treatment, evaluates the corrosion effect under different conditions, and constructs a formate packer fluid system that can meet the user requirements under the conditions of high temperature, high pressure, high CO2 and high H2S content
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