Prospects for the Spectral Noise Logging Application in the Analysis of Stimulated Reservoir Volume in Horizontal Wells with Multistage Fracturing

Abstract

The most effective technique of low-permeability reservoir development is multistage hydraulic fracturing (hydrofrac) in horizontal wells. One of the specific features in operating such wells is that in the vast majority of cases flow rates from the created fractures are insignificant and remain below the sensitivity threshold of most tools that are part of the conventional production logging suite. In addition, development of unconventional reservoirs, such as Bazhenov formation, requires application of special hydraulic fracturing techniques. Therefore, estimation of the contribution from each frac stage into the total production and diagnostics of active fracs are essential and challenging tasks. To solve these tasks, the production logging suite that was run in a horizontal well to Bazhenov formation included Spectral Noise Logging tool which can not only locate the flow zones but is also suitable for identification of the flow zone type. This paper discusses the approaches to Spectral Nose Logging data analysis focused on the problem mentioned above and provides several case studies dealing with application of the production logging suite supplemented with SNL in a horizontal well drilled in Palyanovo area of Kranoleninsk field where multistage fracs had been carried out in the Bazhenov Deposits.