Geophysical Monitoring of the Multilayer Reservoir with of Flooding and Induced Fractures Growth in the Injection Wells

Abstract

This paper considers the results of geophysical logging of multi-layer pumping wells with a bypass system of ESP units. Multi-layer production well testing with Y-tool assembly supports logging under commercial operation upon achievement of a steady-state flow regime. Here, several formations within the field are being operated. Testing of flooding in a low permeability reservoir takes place when injection pressure is higher than the formation fracturing pressure of self-induced fracturing. Downhole logging in multi-layer wells with bypassing of ESP units is used to determine flooded formations where self-induced fracturing takes place. This approach is essential to plan activities to decrease water-cut in multi-layer production wells with injected liquid breakthroughs. In the course of the study, certain field regions with considerable undrilled reserves were found in various formations. The risk of wellbores intersection with dynamically induced fractures in injection wells must be considered with regards to kick-offs of horizontal sidetracks and other well completions. This paper presents the results of numerical simulation using the reservoir model of a development element configuration with a long auto hydraulic fracture and several horizontal wells (HW) with multi-stage hydraulic fractures drilled perpendicular to a fracture in an injection well. Susceptibility to reservoir permeability, number of fractures in HW with multi-stage hydraulic fractures and a distance between fractures were analyzed.