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Information Seminar Paper

Title

MIGRATION OF ACIDIC OIL-DROPLETS BASED ON SURFACE TENSION DIFFERENCES DUE TO PH GRADIENT IN MICROCHANNELS

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Abstract

 THE OIL MIGRATION IN WATER SATURATED POROUS MEDIA IS MAINLY ATTRIBUTED TO THE BUOYANCY, CAPILLARY AND HYDRODYNAMIC FORCES. ALTHOUGH THIS EXPLANATION IS REASONABLE FOR VERTICAL MIGRATION, IT CANNOT EXPLAIN THE MIGRATION OF OIL DROPLETS IN HORIZONTAL DIRECTIONS (EXCEPT CAPILLARY FORCE WHICH CAN AFFECT THE OIL MOVEMENT IN HORIZONTAL DIRECTION). THE HORIZONTAL COMPOSITIONAL GRADING, THUS, IS MAINLY RELATED TO DIVERSITY OF SOURCE ROCKS. HERE THE IMPACT OF PH GRADIENT ON HORIZONTAL MOVEMENT OF OIL DROPLETS WITHIN WATER FILLED MICROCHANNELS IS REPORTED. IN THIS STUDY, ALKALI/ACIDIC SOLUTIONS WERE USED TO CHANGE THE PH VALUES OF SOME SPECIFIED SYSTEMS. A WELL-DEFINED MODEL AS THE ACIDIC OIL SYSTEM WAS SELECTED FOR CONTROLLED DESIGN OF EXPERIMENTS. THE MOTION OF AN ACIDIC OIL DROPLET IN A MICROCHANNEL FILLED WITH AN ALKALINE SOLUTION WITH AN ACIDIC GEL AT ONE ENTRANCE, MAKING A PH GRADIENT, WAS INVESTIGATED. IT SEEMS THAT PH GRADIENT RESULTS IN GENERATION OF IN-SITU SURFACTANTS WHICH CONSEQUENTLY LEADS TO FORMATION OF SURFACE TENSION GRADIENT AND THE SUBSEQUENT MARANGONI FLOW ALONG THE MICROCHANNEL. TO SUPPORT THE EXPERIMENTS AND THE DEVELOPED MECHANISM OF OIL MOTION, THE SURFACE TENSIONS AT VARIOUS PH VALUES WERE MEASURED AND FOR BETTER UNDERSTANDING OF THE MECHANISM, SURFACE TENSION VARIATION AT CONSTANT PH VALUES WAS MEASURED BY INCREASING ACID CONCENTRATION.

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