Rheological characterization of crude oil-water emulsions

Abstract

the polymer-surfactant packages are dissolved in brine and injected into the reservoir in the ceor (chemical enhanced oil recovery) processing, where oil in water type emulsions with different stability are formed. the flow properties of emulsions and their phase separation could be significantly influenced by the flow rate of the fluid phases in the pores of the reservoir rock. the goal of this research was to determine the dynamic viscosity of settled oil-water emulsions. the measurement methods of emulsions were completed with assessment of the phase viscosity characteristics of settled emulsions by using a Brookfield rotational viscometer. Based on the test results it was found that the visually observed phase boundaries were different from that the border determined by the change of dynamic viscosity measured along the liquid column height. the latter method allows a more precise determination of the phase boundary and the ratio of the different phases. keywords: ceor, crude oil-water emulsion, method development, Brookfield viscometer

Carbon Dioxide (CO2) Microbubble Suspension and Stabilization for Advancing Tertiary Oil Recovery

“…Viscous fluids, for example, tend to produce more stable foams by effectively entrapping gas bubbles. The rheological behavior of the emulsion can significantly impact the foam’s texture, bubble size distribution, and drainage rate, all of which are crucial factors affecting foam stability . Beyond EOR, rheology is also important in understanding the structural stability of water-in-oil (W/O) emulsion explosives used in industrial applications, where the type of emulsifier significantly influences the final product .…”

“…The rheological behavior of the emulsion can significantly impact the foam's texture, bubble size distribution, and drainage rate, all of which are crucial factors affecting foam stability. 95 Beyond EOR, rheology is also important in understanding the structural stability of water-in-oil (W/O) emulsion explosives used in industrial applications, where the type of emulsifier significantly influences the final product. 96 Furthermore, the viscosity of emulsions encountered during oil production from reservoirs is heavily influenced by both water content and pressure within the formation.…”

A HLD érték kőolajipari alkalmazhatósága

“…ahol: só: sótartalom tömegszázalékban kifejezve ACN: az tenzidmolekula n-alkil láncának átlagos szénatomszáma ΔT: hőmérsékletkülönbség a referencia hőmérséklethez képest (25°C) A: hozzáadott alkohol mennyisége tömegszázalékban kifejezve σ, α, k, t: az alkalmazott tenzidekre jellemző paraméterek a: az alkoholra és a tenzidre jellemző konstans x: egyes komponensek móltörtjei A fenti egyenletekbe behelyettesítve a standardemulzió demulgeálószer-mentes HLD értékeként -5,94 adódott. Mivel a HLD érték negatív előjelű lett, egy O/V diszperz rendszer valószínűsíthető [8], ezt korábban végzett, reológiai vizsgálataink is igazolták [9]. Az érték nagysága pedig megmutatja, hogy ez a rendszer igen nagy stabilitással bír.…”