Abstract: Puguang Gas Field is an extremely high sulfur hydrogen gas field. With the development of the gas field, the formation pressure is gradually reduced, the elemental sulfur is gradually separated from the natural gas and deposited on the surface equipment, the gathering and transporting pipelines and on the inner wall of the oil pipeline, which gradually causes the sulfur deposition blockage. At present, sulfur deposition and plugging have occurred in the surface gathering and transportation process and wellbore of Puguang Gas Field, which seriously affects the normal production of gas wells. Aiming at the problem that the dynamic characteristics of sulfur deposition and plugging in gas wells are not clear and the corresponding countermeasures are not available, the mechanism of sulfur plugging in gas wells is studied first. We find that the elemental sulfur is gradually precipitated, then transported and deposited, and finally formed a sulfur plug. Secondly, the dynamic characteristics and changing rules of sulfur deposition plugging in surface flow and wellbore are analyzed, the corresponding countermeasures of sulfur deposition plugging in surface and wellbore are proposed, and the field adaptability of various measures was evaluated. Finally, according to the theoretical research and field practice, it is considered that sulfur plugging will gradually develop to the reservoir, and the countermeasures of sulfur plugging removal are proposed. The research results have a guiding significance for comprehensive control of surface-wellbore-reservoir sulfur shutoff in high sulfur gas wells.

Key words: high sulfur content, sulfur deposition, sulfur plugging, ground, wellbore, reservoir, countermeasures