Perforation Cluster Efficiency of Cemented Plug and Perf Limited Entry Completions. Insights from Logging Based Diagnostics

Abstract

Abstract It is now well established that production from horizontal wells with multi-stage hydraulic fracture stimulations performed through plug and perf completions is highly variable along the length of the wellbore. In addition to the elements of the completion design, such as fluid and proppant volume, injection rate, stage length, and the number and spacing of perforation clusters, subsurface conditions influence the performance of individual stimulated perforation clusters, intervals, and wells. Information about completion efficiency can be obtained using conventional well log measurements for fracture fluid mapping. Contemporary logging conveyance methods make this information gathering practical for modern horizontal wellbores. A log-based Perforation Cluster Efficiency (PCE) computational method will be presented. These conventional open-hole logging measurements reveal insights into the Near-Wellbore Region (NWR), including annular cement density, and can be used to anticipate fracture behavior. Integrating well log measurements with Fiber Optic (FO) diagnostics provides insight into the performance of each perforation cluster and the factors controlling frac construction. This paper illustrates recent observations about PCE using traditional well log measurements with new conveyance methods and summarizes the results for several cemented plug and perforated completed Niobrara and Codell wells within the DJ basin. A comparison to interpreted FO DAS data is included, illustrating a good agreement for PCE.