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“Improved Oil Recovery & EOR using Biological Enzymes”

1. Oil is attached to a solid or sand mixture producing high flow resistance that clogs the operation
2. GreenZyme® is injected at 10% in a solution containing water
3. The GreenZyme® solution interacts with the sand increasing its wettability by attaching the water and enzyme solution to the sand and repelling the oil, creating mobility and decreasing its flow resistance.
4. Oil is released from the sand and becomes suitable for extraction.
BTP - Greenzyme tube 2 BTP - Greenzyme tube 1 GreenZyme« EOR Sample Field Test Video Any Type of Oil on Any Type of Solid Surface Greenzyme Graphic of wettability changes of the rock formation and the flow of release oil Colombia (vasconia) oil vs Greenzyme oil mobilized in pores using biological enzymes wettability changes for limestone and limestone with enzyme fluid Wetting Liquid Solid Work of Cohesion (L/L) Work of Adhesion (S/L) + -
Test of Interfacial Tension (IFT) Interfacial tension between crude oil and biological enzyme solution was measured by Type 12 interfacial tensiometer, namely KRUSS made in GmbH Inc, Hamburg, Germany. Tabel.2 and Fig.1 shows the results of interfacial tension test. IFT between crude oil and biological enzyme solution deceases with the increasing of concentration of biological enzyme solution, IFT reaches its lowest value when concentration of biological enzyme solution varies between 6% and 8%, then it increases with the increasing of concentration of biological enzyme solution. Test of Changing Wettability of Rock Surface Wettability is defined as “the tendency of one fluid to spread on or adhere to a solid surface in the presence of other immiscible fluids” (Craig, 1971). When the fluids are water and oil, the wettability is the tendency for the rock to preferentially imbibe oil, water, or both. The wettability of a rock is important because it controls the location, flow, and distribution of fluids within reservoir rocks (Anderson, 1986A). Generally the following criteria are used to decide the wettability of rock. Work of adhesion Solid surfaces are present in porous media, along with fluid phases, and solid fluid interfaces contribute to fluid flow behavior and fluid distribution. Considering a drop of oil on a solid surface, the mechanical equilibrium force balance between oil, water and solid surface yields Young’s equation of capillarity, using the solid surface as a convenient plane of reference. Therefore work of adhesion for water increases with the decreasing of contact angle, while work of adhesion for oil increases with the increasing of contact angle. So it’s easy to enhance oil recovery for reservoir with increasing of water wetting ability because oil film on rock surface is easy to be detached by injected water. Several methods have been presented in the literature for determining the wettability of a rock. The three most common quantitative methods are contact angle measurements, the Amott method, and the USBM method (Anderson, 1986B). In this paper Contact angle measurements was selected to determining the wettability of the rock, because the magnitude of the contact angle gives a direct indication of the wettability of the rock. Contact angle measurements involve a water drop coming in contact with a rock surface and surrounded by oil. Oil and water are allowed to come to equilibrium and the contact angle between the water drop and the rock surface is measured.
SPE 112355 New Agent for Formation-Damage Mitigation in Heavy-Oil Reservoir: Mechanism and Application
Experiment results show that: (1) Biological enzyme can change the wettability for sandstone slice from weakly oil-wet to strongly water-wet in a short time, increase relative permeability to oil phase, decrease the relative permeability to water phase, so reduce water cut of produced liquid; Whereas biological enzyme slowly changes the wettability for limestone slice. (2) For water-wet reservoir, when oil phase is displaced by water phase (imbibition process), biological enzyme can increase driving force, while for oil-wet reservoir, biological enzyme can decrease resistance force (drainage process), which will result in remarkably increasing of actuation, aggregation and movement of residual oil in porous media (3) Biological enzyme can decrease work of adhesion for oil phase, and make easy strip off the residual oil on the surface of rock, so improve oil recovery.