Prediction model of reservoir temperature field and sulfur deposition phase in high-sulfur gas reservoirs
In the high-temperature and high-pressure environment of deep high-sulfur gas reservoirs,as the reservoir temperature and pressure decline in the process of high-sulfur natural gas development,the phase change of sulfur deposition may cause different fluid flow characteristics and the sulfur elements dissolved in acid gas deposit gradually in reservoir pores,thus impacting the normal production of gas wells.In order to investigate the phase change behaviors of sulfur deposition in high-sulfur gas reservoirs,a sulfur deposition phase prediction model considering sulfur deposition and various thermal effects is established according to the production characteristics of multi-fracture horizontal wells.In addition,the numerical models of temperature and pressure fields are solved based on the finite volume method,and the distribution laws of reservoir temperature and pressure fields and the phase change characteristics of sulfur deposition near the well are studied.And the following research results are obtained.First,the reservoir temperature decreases continuously from the reservoir boundary to the hydraulic fracture,reaching the lowest point at the root of the fracture,and the overall temperature in the study area decreases first and then increases with the production time.Second,the weaker the fracture conductivity,the lower the reservoir temperature,and the easier the existence of sulfur deposition in solid form.Third,as the production goes on,the sulfur deposition in the reservoir gradually change from solid to liquid,and the liquid sulfur first appears near the root end of hydraulic fracture.When the production pressure difference increases,the range of solid sulfur deposition will gradually shrink.In conclusion,this prediction model is conducive to further understanding the phase characteristics and laws of sulfur deposition and can provide a theoretical basis for the large-scale benefit development of deep high-sulfur gas reservoirs.
Sour gas reservoirMulti-fracture horizontal wellTemperature fieldSulfur depositionPhase change
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