Browsing by Subject "foam"

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Access status: Open Access ,
Application of multifunctional fluids to improve hydrocarbon production
(2013) Knapik, Ewa; Stopa, Jerzy
In the course of the mature gas fields exploitation there are many technical problems including the corrosion damage, formation of hydrates and water cut. In many cases, an effective solution of these problems is the dosage of appropriately selected chemicals. Commercially available corrosion inhibitors, hydrate inhibitors, demulsifiers and foaming agents are injected in a form of single, multifunctional mixture through one liner which reduces injection costs. The paper presents the results of laboratory tests, which aim was to investigate synergism and antagonism in multifunctional mixture containing different commercially available surfactants, corrosion and hydrate inhibitors. Correlations between final product composition and performances such as liquid unloading efficiency, corrosion protection and pour point were studied. The described approach allows to adapt the tertiary mixture composition (foaming agent + corrosion inhibitor + hydrates inhibitor) to the current production conditions. The polarization behavior of electrodes in brines with and without mixture of additives has been studied by a cyclic voltammetric method. The addition of increasing concentrations of each chemicals causes the reduction in the corrosion current density. The measurements using a modified method of the US Bureau of Mines show synergistic effect of surfactants and corrosion inhibitor on foamabilities. Multifunctional mixtures are stable under storage conditions and not cause any compatibility problems with reservoir fluids.
Access status: Open Access ,
Wpływ zmian zagęszczenia mętów flotacyjnych węgla na ilość wody w produktach pianowych
(2006) Małysa, Ewa; Surowiak, Agnieszka
Results of coal flotation depend not only on surface properties of coal grains but can also be significantly affected by a degree of the gas phase dispersion, size of the air bubbles and properties of the froth layer formed. The paper aimed at determination of influence of the coal pulp density (solid parts concentration) and the pulp volume on water contents in the froth concentrates. It was found that amounts of water contained in the froth products depended on the coal pulp density. Highest water contents were obtained for the pulp density of 80 g/dm$^3$. This is an interesting result as it correlates well with the highest yield of the coal, which was obtained also at this pulp density. Water contents in the froth products were also analyzed as a function of the flotation time. It was observed that for all flotation times the highest water contents were at the pulp density of 80 g/dm$^3$. These data seem to indicate that there can exists a correlation between high coal yield and water contents in froth, but this question requires further studies.