Summary: SPE 149535
New Model to Predict Formation Damage due to Sulfur Deposition in Sour
M.A. Mahmoud and A.A. Al-Majed, KFUPM, all SPE
Copyright 2012, Society of Petroleum Engineers
This paper was prepared for presentation at the North Africa Technical Conference and Exhibition held in Cairo, Egypt, 2022 February 2012.
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Elemental sulfur (S8) is often present in considerable amounts in sour gas reservoirs at the reservoir conditions (pressure and
temperature). For the isothermal conditions in the reservoir, the reduction in reservoir pressure below a critical value will
cause the elemental sulfur to deposit in the formation. Sulfur deposition can cause severe loss in the pore space available for
gas, and in turn it will affect the gas well productivity. Accurate prediction of sulfur deposition in the reservoir will help in
better management of sour gas reservoirs with potential sulfur deposition problems.
In this paper a new analytical model was developed to predict the formation damage due to sulfur deposition. This
model can be used to study the effect of sulfur deposition on gas relative permeability, reservoir porosity, skin damage and
reservoir rock wettability. The main objective of this model is to investigate the effect of radial distance on formation
damage. Accurate correlations of different rock and fluid properties were used in this model for improved predictions.