Research on Reservoir Heterogeneity of Complex Region

Abstract

From the context of this area, combined with the well, core and logging data, the characteristics of heterogeneity of this region can be studied. Through calculating the parameters like porosity, permeability, saturation, permeability coefficient of variation, sudden coefficient and differential, the heterogeneity in the layer and the plane has been studied. The sand groups in the Chang 6 reservoir mainly are delta front sand underwater distributary channel sand body, the heterogeneity in the layer is weak; In the plane, the heterogeneity of distributary channel sand body is weak, while the one in estuary dam, front sheet sands and underwater natural levee is strong. Through comprehensive analysis, Chang 6 reservoir in Hulangmao region is strong heterogeneity reservoir. After comparing permeability coefficient of variation, sudden coefficient and differential of 3 layer and 5 layer in Chang 6,it can conclude that the development effect of 5 layer is better than 3 layer in the process of water-flooding development. This research can be some guidance to some area in the mainland.

Electrostatic Effect on Core–Shell Micro-spheres with Mixed Charges as Adaptive Plugging Agents for Enhanced Oil Recovery

“…More and more mature oilfields in China become seriously heterogeneous 1,2 with high water cut in the extraction fluid, 3,4 resulting in low oil production and high costs. Currently, extensive chemicals have been adopted in the oilfields for profile control to reduce the water cut and improve the oil production, including foam agents 5,6 and cross-linked polymers, 7−13 such as preformed particle gels, polyacrylamide micro-spheres (MS), and underground delayed cross-linking systems.…”

“…More and more mature oilfields in China become seriously heterogeneous , with high water cut in the extraction fluid, , resulting in low oil production and high costs. Currently, extensive chemicals have been adopted in the oilfields for profile control to reduce the water cut and improve the oil production, including foam agents , and cross-linked polymers, − such as preformed particle gels, polyacrylamide micro-spheres (MS), and underground delayed cross-linking systems. − Plugging behavior of conventional cross-linked polymers is based on the mechanism of physical bridging at reservoir pore throats, the narrowest parts where the fluid transports, depending on the size matching relationship − between the plugging agents, which are used to plug the highly permeable zones of the reservoir by physical bridging, and the reservoir pore throats.…”