For Horizontal Wells Stimulated with Multistage Hydraulic Fracturing GEOSPLIT marked proppant is added to the base mass of ordinary proppant and then is injected to the reservoir as a working material during hydraulic fracturing.Later, there is a long period (not less than two years) of gradual washing-out of the marker-reporters with water and oil. They are transported to the surface via reservoir fluid flow. Marker-reporters are segregated to both oil and water reservoir fluid phases.
r fluid.