Abstract: The study on the sulfur deposition belongs to one of four important tasks to develop the high sulfur gas reservoirs safely and reasonably.With the decrease of the formation pressure in the high sulfur gas reservoirs,the solubility of elemental sulfur is descending.Once the solubility of elemental sulfur is less than the elemental sulfur content,the elemental sulfur will deposit from the formation.The deposited sulfur blocks the formation pore space and reduces permeability,which severely impacts the gas deliverability.In order to study the deposition pattern and feature of the sulfur,the experiment is carried out by using the TD5-1 gas passing the core to deposit the elemental sulfur in lower pressure,then,the core is analyzed by Scanning Electron Microscope (SEM) and energy spectrum.The deposition pattern and micro-distribution on elemental sulfur is drawn,i.e.,the elemental sulfur distributes around the pore surface filmily.The results can lay foundation for further understanding and guiding the reasonable development of the high sulfur content gas reservoirs.

Key words: high sulfur content, elemental sulfur, sulfur deposition, experimental study, formation damage