Puguang gas field scientific anti-corrosion to do CT scan of the gathering system

On August 6th, a new "colleague" joined the team at the gas production plant—a scanning electron microscope. This advanced equipment is expected to significantly enhance corrosion research capabilities and serve as an essential tool in the laboratory, according to Zhang Cheng, Ph.D., from the Engineering Research Institute of Oil Production Engineering. The Puguang gas field is classified as a high-acid gas field, with an average hydrogen sulfide content of up to 16%, making corrosion risks much higher than in conventional gas fields. From the very beginning of development, corrosion has been a major challenge that threatens the safe and sustainable operation of the gas field. To address this issue, Puguang Gas Field has invested heavily in technological innovation and research, integrating various corrosion control and monitoring techniques such as corrosion inhibitor injection, pre-coating, cathodic protection, and pipeline intelligent detection—much like preserving fresh produce. These measures ensure the smooth and secure operation of the gas gathering system during production. "We have implemented the most comprehensive anti-corrosion monitoring technology available in international high-acid gas fields," said Hui Xiaomin, deputy director of the Institute of Oil Production Engineering Technology. "After more than three years of operation, the corrosion rate of the gathering system remains below the control standard of 0.076 mm per year, maintaining a safe and controlled state." Currently, the corrosion monitoring system covers the entire gas gathering and transportation network, including corrosion coupons, electric head probes, and electrical fingerprinting technologies. There are 138 key monitoring points across the main gas collection stations, with data from each point uploaded to a central database. This provides a scientific foundation for assessing the corrosion condition of the gas field's infrastructure. Corrosion monitoring not only helps understand the current corrosion status but also supports the optimization of anti-corrosion strategies. "In the early stages of production, due to the coexistence of hydrogen sulfide and carbon dioxide, we increased the continuous injection standards for corrosion inhibitors for safety reasons," explained Liu Erxi, deputy director of the Technical Office at the Gas Production Plant. In the first half of this year, the plant conducted a comprehensive analysis of the corrosion situation, optimized the parameters for corrosion inhibitor injection, and studied residual concentrations. They adjusted the dosage and frequency of injection, starting with a corrosion reduction test at the Puguang 107 gas gathering station. Through continuous optimization, the continuous corrosion inhibitor consumption was reduced to 54 liters per million cubic meters of natural gas, saving approximately 17 million yuan in costs during the first half of the year. Anti-corrosion efforts require not just detailed "scans" of the system but also effective "treatment" plans based on the results. The Puguang gas field houses one of Sinopec’s two hydrogen sulfide laboratories. "Our high-pressure corrosion testing facility is equipped with advanced tools and instruments, allowing researchers to study corrosion issues in the gas gathering and transportation system," said Zhang Cheng. "Like a doctor, we develop 'prescriptions' to solve problems and guide the gas field’s anti-corrosion efforts scientifically." With the gas field operating at full capacity, the laboratory has completed extensive work, including corrosion research on the sewage discharge pipelines in Dawan. It has also actively participated in several critical operations related to corrosion inhibitor exchange at Dawan and Puguang. These efforts provide scientific and efficient solutions to manage corrosion in the gathering system. "Containing corrosion is not only essential for gas field development but also a social responsibility," said Cao Yanguang, director of the Institute of Oil Production Engineering and Technology.

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