Application of Multi-tracer Testing in Multi-layered Reservoirs Development in High Water Cut Period

The single tracer testing technology only calculates thickness,permeability and pore passage radius of water flood zones,but does not quantitatively and accurately estimate remaining oil saturation.The complex fault block reservoirs have many strata series.When developing well to well tracer interpretation software,we only consider oil-and-water two-phase,i.e.,oil component,water component,allocated tracer and non-allocated tracer(called as four-component),based on which we have set up a twophase four-component math model.Then,implicit pressure explicit saturation method in black oil model is used to resolve pressure and many remaining oil saturation in the substrata.The technology to increase the tracer types and inject different tracers into the layered water-injection intervals may present vertical and horizontal distribution of the remaining oil.Application of multi tracer testing in Xin68-66 well group proved this technology is better.