«Oilfield engineering»

Experimental study of emulsion formation in the system of Chayandinskoye field condensate – methanol – water

UDC: 622.279.72
DOI: -

Authors:

¹ Center for Hydrocarbon Production Science and Technology, Skolkovo Institute of Science and Technology, Moscow, Russia
² Gazprom VNIIGAZ, St. Petersburg, Russia

Keywords: methanol, condensate, oil, emulsion, water-methanol solution, Chayandinskoye oil and gas condensate field

Annotation:

To study emulsion formation in gas condensate systems, a series of laboratory experiments were conducted with gas condensate of Chayandinskoye field (without adding oil of Chayandinskoye field and with its addition to simulate oil traces presence in the condensate), pure methanol, distilled water and highly mineralized formation water.

In the gas condensate with an admixture of oil – methanol system, a stable emulsion is formed with a separation time of several hours, but when highly mineralized formation water is added to it, it quickly separates into three phases: water-methanol solution, condensate and oil. When dispersing the three-component system – gas condensate – water – methanol, opalescence is observed in both phases, but a stable emulsion is not formed. In the four-component system gas condensate with an admixture of oil – distilled water – methanol, a stable emulsion is formed with a lifetime of more than one hour. Whereas when mixing gas condensate with an admixture of oil – formation water – methanol – a stable emulsion is not formed after homogenization, but opalescence is present in both phases, and globules stabilized by particles (salts) precipitated from the water are formed at the phase boundary. A new mechanism of a stable emulsion formation in gas condensate systems has been discovered. When distilled water is added dropwise to the initial gas condensate – methanol system that has been stratified after homogenization, the dissolved gas condensate is released from the methanol forming a stable emulsion of the gas condensate type in a water-methanol solution type with a lifetime of more than one day.

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