diff --git a/AsbCloudApp/Services/Subsystems/ISubsystemOperationTimeService.cs b/AsbCloudApp/Services/Subsystems/ISubsystemOperationTimeService.cs
index 746fa398..774b8754 100644
--- a/AsbCloudApp/Services/Subsystems/ISubsystemOperationTimeService.cs
+++ b/AsbCloudApp/Services/Subsystems/ISubsystemOperationTimeService.cs
@@ -63,14 +63,6 @@ namespace AsbCloudApp.Services.Subsystems
         /// <param name="wellIds"></param>
         /// <param name="token"></param>
         /// <returns></returns>
-        Task<IEnumerable<SubsystemActiveWellStatDto>> GetStatByActiveWells(IEnumerable<int> wellIds, CancellationToken token);
-        
-        /// <summary>
-        /// Получение периода, за который будет расчитываться статистика
-        /// </summary>
-        /// <param name="request"></param>
-        /// <param name="token"></param>
-        /// <returns></returns>
-        Task<IEnumerable<DateTime>> GetStatDateRangeAsync(SubsystemOperationTimeRequest request, CancellationToken token);
+        Task<IEnumerable<SubsystemActiveWellStatDto>> GetStatByActiveWells(IEnumerable<int> wellIds, CancellationToken token);        
     }
 }
diff --git a/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs b/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
index 3dcf51a9..beafaf35 100644
--- a/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
+++ b/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
@@ -1,6 +1,7 @@
 using AsbCloudApp.Data;
 using AsbCloudApp.Data.DetectedOperation;
 using AsbCloudApp.Data.Subsystems;
+using AsbCloudApp.Exceptions;
 using AsbCloudApp.Requests;
 using AsbCloudApp.Services;
 using AsbCloudApp.Services.Subsystems;
@@ -17,10 +18,8 @@ using System.Threading.Tasks;
 
 namespace AsbCloudInfrastructure.Services.Subsystems
 {
-
     internal class SubsystemOperationTimeService : ISubsystemOperationTimeService
     {
-
         private readonly IAsbCloudDbContext db;
         private readonly IWellService wellService;
         private readonly ICrudRepository<SubsystemDto> subsystemService;
@@ -111,22 +110,6 @@ namespace AsbCloudInfrastructure.Services.Subsystems
             return statList;
         }
 
-        public async Task<IEnumerable<DateTime>> GetStatDateRangeAsync(SubsystemOperationTimeRequest request, CancellationToken token)
-        {
-            request.SelectMode = SubsystemOperationTimeRequest.SelectModeTrim;
-            var data = await GetOperationTimeAsync(request, token);
-            if (data is null)
-                return Enumerable.Empty<DateTime>();
-
-            var dateRanges = new List<DateTime>
-            {
-                data.Min(d => d.DateStart),
-                data.Max(d => d.DateEnd)
-            };
-
-            return dateRanges.AsEnumerable();
-        }
-
         private static IEnumerable<SubsystemOperationTime> TrimOperation(IEnumerable<SubsystemOperationTime> data, DateTimeOffset? gtDate, DateTimeOffset? ltDate)
         {
             if (!ltDate.HasValue && !gtDate.HasValue) 
@@ -219,6 +202,7 @@ namespace AsbCloudInfrastructure.Services.Subsystems
 
             return depthInterval;
         }
+
         private static double GetDepthIntervalSubsystem(int idSubsystem, (double depthIntervalRotor, double depthIntervalSlide) depthInterval)
         {
             var depthIntervalSubsystem = 0d;
@@ -350,11 +334,11 @@ namespace AsbCloudInfrastructure.Services.Subsystems
             return result;
         }
 
-        private IQueryable<SubsystemOperationTime>? BuildQuery(SubsystemOperationTimeRequest request)
+        private IQueryable<SubsystemOperationTime> BuildQuery(SubsystemOperationTimeRequest request)
         {
             var well = wellService.GetOrDefault(request.IdWell);
             if (well?.IdTelemetry is null || well.Timezone is null)
-                return null;
+                throw new ArgumentInvalidException($"Not valid IdWell = {request.IdWell}", nameof(request.IdWell));
 
             var query = db.SubsystemOperationTimes
                 .Include(o => o.Subsystem)
@@ -412,9 +396,6 @@ namespace AsbCloudInfrastructure.Services.Subsystems
             dto.DateStart = operationTime.DateStart.ToRemoteDateTime(hours);
             dto.DateEnd = operationTime.DateEnd.ToRemoteDateTime(hours);
             return dto;
-        }
-
-        
+        }        
     }
-
 }