diff --git a/AsbCloudInfrastructure/Services/Subsystems/SubsystemService.cs b/AsbCloudInfrastructure/Services/Subsystems/SubsystemService.cs
index a6b28866..ed2571a9 100644
--- a/AsbCloudInfrastructure/Services/Subsystems/SubsystemService.cs
+++ b/AsbCloudInfrastructure/Services/Subsystems/SubsystemService.cs
@@ -57,7 +57,7 @@ internal class SubsystemService : ISubsystemService
         var result = new List<DrillerDetectedOperationStatDto>();
         var schedulePage = await scheduleRepository.GetPageAsync(request, token);
         var wells = await wellService.GetAsync(new WellRequest { Ids = request.IdsWells }, token);
-
+        
         foreach (var schedule in schedulePage)
         {
             var idWell = schedule.IdWell;
@@ -68,15 +68,21 @@ internal class SubsystemService : ISubsystemService
             var detectedOperations = await detectedOperationService
                 .GetOperationsAsync(byWellRequest, token);
 
-            var detectedOperationsByCurrentDriller = detectedOperations.Where(d => d.Driller?.Id == schedule.IdDriller);
-            var drillerOperationsStat = await CalcStatAsync(detectedOperationsByCurrentDriller, token);
-            var dto = new DrillerDetectedOperationStatDto
+            var groupByDriller = detectedOperations
+                .Where(operation => operation.Driller is not null)
+                .GroupBy(operation => operation.Driller);
+
+            foreach (var entry in groupByDriller)
             {
-                Statistic = drillerOperationsStat,
-                Schedule = schedule,
-                Well = well,
-            };
-            result.Add(dto);
+                var drillerOperationsStat = await CalcStatAsync(entry, token);
+                var dto = new DrillerDetectedOperationStatDto
+                {
+                    Statistic = drillerOperationsStat,
+                    Schedule = schedule,
+                    Well = well,
+                };
+                result.Add(dto);
+            }
         }
 
         return result;