要約

In fields or wells with active programmes of scale and corrosion management via chemical inhibitor injection, the performance of the injected chemical inhibitor species in terms of their adsorption and desorption characteristics is very crucial to the success of the chemical injection program. Benchmarks for measuring inhibitor performance include rapid, relatively steep adsorption isotherms and slow, relatively less-steep desorption isotherms. The adsorption and desorption characteristics of three different pack sands taken as reservoir formation analogues were investigated using static and dynamic laboratory tests. Specifically, the investigation focused on the petrophysical and grain parameter controls on the adsorption and desorption characteristics of these sands. Correlation of adsorption intensity with the sand uniformity coefficient exhibited a direct relationship for the static model while it exhibited an inverse relationship for the dynamic model. Contrastingly, correlation of adsorption strength with the uniformity coefficient exhibited an inverse relationship for the static model and a direct relationship for the dynamic model. Integration of the correlation coefficients from the adsorption/desorption data with the adsorption intensity, adsorption strength, and adsorption capacity showed that the Freundlich model was better suited to modeling the adsorption/desorption characteristics of the gravel pack sands.