Material Optimization of Injection and Production String in Su4 Underground Gas Storage

Abstract

There was carbon dioxide (CO2), hydrogen sulfide (H2S) and other corrosive media in underground gas storage. As injection-production running, the injection and production string suffered corrosion. The wall of string might be thinner and be perforated. The well safety was influenced, and even the gas storage. How to choose reasonable and efficient anti-corrosion material was an important problem. According to Su 4 underground gas storage actual injection-production condition and the corrosion environment, the software simulation and laboratory experiments have been done. The material of injection-production string optimization was optimized, based on the evaluation of corrosion rate and the two aspects of sulfide stress cracking resistance. The results showed that the imported super 13Cr (S13Cr) could meet demand. It could ensure that the string corrosion rate was smaller than 0.125 mm/a and there was no pitting corrosion. When the tpemerature was at 135℃, only the S13Cr corrosion passivation membrane was not been damaged. And the sulfide stress cracking (SSC) would not occur. The S13Cr is recoomneded Su 4 underground gas storage.