Abstract: In high sulfur-bearing gas reservoir, with decline of formation energy, the hydrogen polysulfide of gas will be decomposed and the sulfur element will be precipitated. When the sulfur amount precipitated reaches a critical value and the fuid hydrodynamic force is insufficient to carry it, the sulfur will deposit and accumulate in pores of formation, in which contamination will occur, and two characteristic regions will be formed such as contaminated zone and uncontaminated one of sulfur deposit. This paper presents such two- zone compound well test interpretation mathematical model for high sulfur-bearing gas reservoir with dual porosity media. Using Stehfest inverse algorithm the corresponding typical curves of botom-hole pressure are calculated, the correlate parameters' sensitivity to the bottom pressure performance is analyzed. .

Key words: gas reservoir, sulfur, dual porosity media, well testing, model