diff --git a/AsbCloudApp/Services/IFileCategoryService.cs b/AsbCloudApp/Services/IFileCategoryService.cs
index 91ca05a7..f660d0fa 100644
--- a/AsbCloudApp/Services/IFileCategoryService.cs
+++ b/AsbCloudApp/Services/IFileCategoryService.cs
@@ -16,7 +16,7 @@ namespace AsbCloudApp.Services
         /// <param name="id"></param>
         /// <param name="token"></param>
         /// <returns></returns>
-        Task<FileCategoryDto> GetOrDefaultAsync(int id, CancellationToken token);
+        Task<FileCategoryDto?> GetOrDefaultAsync(int id, CancellationToken token);
 
         /// <summary>
         /// Получение справочника категорий файлов
diff --git a/AsbCloudApp/Services/IMeasureService.cs b/AsbCloudApp/Services/IMeasureService.cs
index f7fff368..ceb99ce1 100644
--- a/AsbCloudApp/Services/IMeasureService.cs
+++ b/AsbCloudApp/Services/IMeasureService.cs
@@ -24,7 +24,7 @@ namespace AsbCloudApp.Services
         /// <param name="idCategory"></param>
         /// <param name="token"></param>
         /// <returns></returns>
-        Task<MeasureDto> GetLastAsync(int idWell, int idCategory, CancellationToken token);
+        Task<MeasureDto?> GetLastOrDefaultAsync(int idWell, int idCategory, CancellationToken token);
 
         /// <summary>
         /// История измерений по категории
diff --git a/AsbCloudInfrastructure/DateTimeExtentions.cs b/AsbCloudInfrastructure/DateTimeExtentions.cs
index 01a994b9..9686e948 100644
--- a/AsbCloudInfrastructure/DateTimeExtentions.cs
+++ b/AsbCloudInfrastructure/DateTimeExtentions.cs
@@ -2,6 +2,7 @@
 
 namespace AsbCloudInfrastructure
 {
+#nullable enable
     public static class DateTimeExtentions
     {
         /// <summary>
@@ -77,4 +78,5 @@ namespace AsbCloudInfrastructure
                 return indexOfMiddle;
         }
     }
+#nullable disable
 }
diff --git a/AsbCloudInfrastructure/IInfrastructureMarker.cs b/AsbCloudInfrastructure/IInfrastructureMarker.cs
deleted file mode 100644
index 207081d6..00000000
--- a/AsbCloudInfrastructure/IInfrastructureMarker.cs
+++ /dev/null
@@ -1,8 +0,0 @@
-namespace AsbCloudInfrastructure
-{
-    /// <summary>
-    /// Тип для поиска этой сборки
-    /// </summary>
-    public interface IInfrastructureMarker
-    { }
-}
diff --git a/AsbCloudInfrastructure/Repository/WitsRecordRepository.cs b/AsbCloudInfrastructure/Repository/WitsRecordRepository.cs
index eeac93d9..743b4e29 100644
--- a/AsbCloudInfrastructure/Repository/WitsRecordRepository.cs
+++ b/AsbCloudInfrastructure/Repository/WitsRecordRepository.cs
@@ -81,7 +81,6 @@ namespace AsbCloudInfrastructure.Repository
             var timezoneHours = telemetryService.GetTimezone(idTelemetry).Hours;
             var entities = dtos
                 .DistinctBy(d => d.DateTime)
-                .Where(dto => dto is not null)
                 .Select(dto => Convert(dto, idTelemetry, timezoneHours));
 
             var dateMin = entities.Min(e => e.DateTime);
diff --git a/AsbCloudInfrastructure/Services/DrillingProgram/DrillingProgramMaker.cs b/AsbCloudInfrastructure/Services/DrillingProgram/DrillingProgramMaker.cs
index 032895c9..d159ac56 100644
--- a/AsbCloudInfrastructure/Services/DrillingProgram/DrillingProgramMaker.cs
+++ b/AsbCloudInfrastructure/Services/DrillingProgram/DrillingProgramMaker.cs
@@ -16,9 +16,7 @@ namespace AsbCloudInfrastructure.Services.DrillingProgram
             var resultExcelFile = new XLWorkbook(XLEventTracking.Disabled);
             
             var titleSheet = resultExcelFile.AddWorksheet("Титульный лист");
-            var marks = parts
-                .Where(p => p.File is not null)
-                .SelectMany(p => p.File!.FileMarks);
+            var marks = parts.SelectMany(p => p.File!.FileMarks);
             var titleSheetMaker = new TitleListSheet(marks, well);
             titleSheetMaker.Draw(titleSheet);
 
diff --git a/AsbCloudInfrastructure/Services/Email/BaseFactory.cs b/AsbCloudInfrastructure/Services/Email/BaseFactory.cs
index 81a319cd..4e6d3084 100644
--- a/AsbCloudInfrastructure/Services/Email/BaseFactory.cs
+++ b/AsbCloudInfrastructure/Services/Email/BaseFactory.cs
@@ -1,10 +1,12 @@
 using AsbCloudApp.Data;
+using AsbCloudApp.Exceptions;
 using Microsoft.Extensions.Configuration;
 using System;
 using System.IO;
 
 namespace AsbCloudInfrastructure.Services.Email
 {
+#nullable enable
     public class BaseFactory
     {
         private readonly string platformName;
@@ -23,14 +25,13 @@ namespace AsbCloudInfrastructure.Services.Email
         public static string GetImageBase64(string resourceFileName)
         {
             if (string.IsNullOrEmpty(resourceFileName))
-                return null;
+                throw new ArgumentInvalidException("ResourceFileName doesn`t exist", nameof(resourceFileName));
 
-            var baseDir = Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
+            var baseDir = Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location)
+            ?? string.Empty;
             var resoursesDir = "Res";
 
             var logoFilePath = Path.Combine(baseDir, resoursesDir, resourceFileName);
-            if(!File.Exists(logoFilePath))
-                return string.Empty;
             var imageBytes = File.ReadAllBytes(logoFilePath);
             var format = Path.GetExtension(resourceFileName).Trim('.');
             return "data:image/" + format + ";base64," + Convert.ToBase64String(imageBytes);
@@ -53,4 +54,5 @@ namespace AsbCloudInfrastructure.Services.Email
         public virtual string MakeSubject(WellDto well, string action)
             => $"{well.Deposit}, {well.Cluster}, {well.Caption}. {action}";
     }
+#nullable disable
 }
diff --git a/AsbCloudInfrastructure/Services/Email/DrillingMailBodyFactory.cs b/AsbCloudInfrastructure/Services/Email/DrillingMailBodyFactory.cs
index 664fee99..eb0bef1a 100644
--- a/AsbCloudInfrastructure/Services/Email/DrillingMailBodyFactory.cs
+++ b/AsbCloudInfrastructure/Services/Email/DrillingMailBodyFactory.cs
@@ -6,7 +6,8 @@ using System.IO;
 
 namespace AsbCloudInfrastructure
 {
-    class DrillingMailBodyFactory : BaseFactory
+#nullable enable
+	class DrillingMailBodyFactory : BaseFactory
     {
 		private readonly string platformName;
         private readonly string platformUrl;
@@ -84,4 +85,5 @@ namespace AsbCloudInfrastructure
 			return drillingProgramHref;
 		}
 	}
+#nullable disable
 }
diff --git a/AsbCloudInfrastructure/Services/Email/WellFinalDocumentMailBodyFactory .cs b/AsbCloudInfrastructure/Services/Email/WellFinalDocumentMailBodyFactory .cs
index e83fa55a..9d409c0c 100644
--- a/AsbCloudInfrastructure/Services/Email/WellFinalDocumentMailBodyFactory .cs	
+++ b/AsbCloudInfrastructure/Services/Email/WellFinalDocumentMailBodyFactory .cs	
@@ -6,7 +6,8 @@ using System.IO;
 
 namespace AsbCloudInfrastructure
 {
-    class WellFinalDocumentMailBodyFactory : BaseFactory
+#nullable enable
+	class WellFinalDocumentMailBodyFactory : BaseFactory
     {
 		private readonly string platformName;
 
@@ -29,4 +30,5 @@ namespace AsbCloudInfrastructure
 			return body;
 		}
 	}
+#nullable disable
 }
diff --git a/AsbCloudInfrastructure/Services/FileCategoryService.cs b/AsbCloudInfrastructure/Services/FileCategoryService.cs
index b50c9418..4f07a34c 100644
--- a/AsbCloudInfrastructure/Services/FileCategoryService.cs
+++ b/AsbCloudInfrastructure/Services/FileCategoryService.cs
@@ -10,6 +10,7 @@ using System.Threading.Tasks;
 
 namespace AsbCloudInfrastructure.Services
 {
+#nullable enable
     public class FileCategoryService : CrudCacheRepositoryBase<FileCategoryDto, FileCategory>, IFileCategoryService
     {
         public FileCategoryService(IAsbCloudDbContext context, IMemoryCache memoryCache)
@@ -28,4 +29,5 @@ namespace AsbCloudInfrastructure.Services
             return dtos;
         }
     }
+#nullable disable
 }
diff --git a/AsbCloudInfrastructure/Services/IConverter.cs b/AsbCloudInfrastructure/Services/IConverter.cs
deleted file mode 100644
index a1c6fd54..00000000
--- a/AsbCloudInfrastructure/Services/IConverter.cs
+++ /dev/null
@@ -1,8 +0,0 @@
-namespace AsbCloudInfrastructure.Services
-{
-    public interface IConverter<TDto, TModel>
-    {
-        TModel Convert(TDto src);
-        TDto Convert(TModel src);
-    }
-}
\ No newline at end of file
diff --git a/AsbCloudInfrastructure/Services/ProcessMap/ProcessMapReportService.cs b/AsbCloudInfrastructure/Services/ProcessMap/ProcessMapReportService.cs
index f0c69468..15b1455b 100644
--- a/AsbCloudInfrastructure/Services/ProcessMap/ProcessMapReportService.cs
+++ b/AsbCloudInfrastructure/Services/ProcessMap/ProcessMapReportService.cs
@@ -6,7 +6,6 @@ using AsbCloudApp.Services;
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Numerics;
 using System.Threading;
 using System.Threading.Tasks;
 
diff --git a/AsbCloudInfrastructure/Services/ProcessMap/XLExtentions.cs b/AsbCloudInfrastructure/Services/ProcessMap/XLExtentions.cs
index b5443037..6e0a56e3 100644
--- a/AsbCloudInfrastructure/Services/ProcessMap/XLExtentions.cs
+++ b/AsbCloudInfrastructure/Services/ProcessMap/XLExtentions.cs
@@ -5,6 +5,7 @@ namespace AsbCloudInfrastructure.Services.ProcessMap;
 
 internal static class XLExtentions
 {
+#nullable enable
     public static IXLCell SetVal(this IXLCell cell, string value, bool adaptRowHeight = false)
     {
         cell.Value = value;
@@ -47,4 +48,5 @@ internal static class XLExtentions
         cell.Style.NumberFormat.Format = format;
         return cell;
     }
+#nullable disable
 }
diff --git a/AsbCloudInfrastructure/Services/SAUB/CsvSerializer.cs b/AsbCloudInfrastructure/Services/SAUB/CsvSerializer.cs
index a7b5a80f..7b089dbb 100644
--- a/AsbCloudInfrastructure/Services/SAUB/CsvSerializer.cs
+++ b/AsbCloudInfrastructure/Services/SAUB/CsvSerializer.cs
@@ -1,5 +1,4 @@
-using DocumentFormat.OpenXml.Drawing.Diagrams;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Reflection;
diff --git a/AsbCloudInfrastructure/Services/SAUB/EventService.cs b/AsbCloudInfrastructure/Services/SAUB/EventService.cs
index 56fe1737..71760736 100644
--- a/AsbCloudInfrastructure/Services/SAUB/EventService.cs
+++ b/AsbCloudInfrastructure/Services/SAUB/EventService.cs
@@ -10,6 +10,7 @@ using System.Threading.Tasks;
 
 namespace AsbCloudInfrastructure.Services.SAUB
 {
+#nullable enable
     public class EventService : IEventService
     {
         private readonly IAsbCloudDbContext db;
@@ -42,4 +43,5 @@ namespace AsbCloudInfrastructure.Services.SAUB
             memoryCache.DropBasic<TelemetryEvent>();
         }
     }
+#nullable disable
 }
diff --git a/AsbCloudInfrastructure/Services/SAUB/SetpointsService.cs b/AsbCloudInfrastructure/Services/SAUB/SetpointsService.cs
index f5ebdb05..bd86b5fb 100644
--- a/AsbCloudInfrastructure/Services/SAUB/SetpointsService.cs
+++ b/AsbCloudInfrastructure/Services/SAUB/SetpointsService.cs
@@ -113,4 +113,5 @@ namespace AsbCloudInfrastructure.Services.SAUB
         public IEnumerable<SetpointInfoDto> GetSetpointsNames()
             => SetpointInfos.Values;
     }
+#nullable disable
 }
diff --git a/AsbCloudInfrastructure/Services/SAUB/TelemetryDataSpinService.cs b/AsbCloudInfrastructure/Services/SAUB/TelemetryDataSpinService.cs
index 64862dcc..1773c0a2 100644
--- a/AsbCloudInfrastructure/Services/SAUB/TelemetryDataSpinService.cs
+++ b/AsbCloudInfrastructure/Services/SAUB/TelemetryDataSpinService.cs
@@ -5,6 +5,7 @@ using Mapster;
 
 namespace AsbCloudInfrastructure.Services.SAUB
 {
+#nullable enable
     public class TelemetryDataSpinService : TelemetryDataBaseService<TelemetryDataSpinDto, TelemetryDataSpin>
     {
         public TelemetryDataSpinService(
@@ -28,4 +29,5 @@ namespace AsbCloudInfrastructure.Services.SAUB
             return dto;
         }
     }
+#nullable disable
 }
diff --git a/AsbCloudInfrastructure/Services/SAUB/TelemetryTracker.cs b/AsbCloudInfrastructure/Services/SAUB/TelemetryTracker.cs
index ff5ca394..3cdf0776 100644
--- a/AsbCloudInfrastructure/Services/SAUB/TelemetryTracker.cs
+++ b/AsbCloudInfrastructure/Services/SAUB/TelemetryTracker.cs
@@ -12,13 +12,14 @@ using System.Threading.Tasks;
 
 namespace AsbCloudInfrastructure.Services.SAUB
 {
+#nullable enable
     public class TelemetryTracker : ITelemetryTracker
     {
         class TrackerStat
         {
             //public int Id { get; set; }
 
-            public string RemoteUid { get; set; }
+            public string RemoteUid { get; set; } = null!;
 
             /// <summary>
             /// Время последнего запроса (по времени сервера)
@@ -88,10 +89,14 @@ namespace AsbCloudInfrastructure.Services.SAUB
 
                 foreach (var oldReq in oldRequests)
                 {
-                    var telemetryStat = telemetriesStats.GetOrAdd(oldReq.Uid, (uid) => new TrackerStat { RemoteUid = uid });
-                    telemetryStat.TelemetryDateUtcMin = oldReq.DateMin;
-                    telemetryStat.TelemetryDateUtcMax = oldReq.DateMax;
-                    telemetryStat.LastTimeServer = oldReq.DateMax;
+                    if (oldReq.Uid is not null)
+                    {
+                        var telemetryStat = telemetriesStats.GetOrAdd(oldReq.Uid, (uid) => new TrackerStat { RemoteUid = uid });
+                        telemetryStat.TelemetryDateUtcMin = oldReq.DateMin;
+                        telemetryStat.TelemetryDateUtcMax = oldReq.DateMax;
+                        telemetryStat.LastTimeServer = oldReq.DateMax;
+                    }
+                   
                 }
             }).ContinueWith((t) =>
             {
@@ -147,4 +152,5 @@ namespace AsbCloudInfrastructure.Services.SAUB
         public IEnumerable<string> GetTransmittingTelemetriesUids() =>
             telemetriesStats.Keys;
     }
+#nullable disable
 }
diff --git a/AsbCloudInfrastructure/Services/Trajectory/TrajectoryVisualizationService.cs b/AsbCloudInfrastructure/Services/Trajectory/TrajectoryVisualizationService.cs
index d8a30c7d..04b76630 100644
--- a/AsbCloudInfrastructure/Services/Trajectory/TrajectoryVisualizationService.cs
+++ b/AsbCloudInfrastructure/Services/Trajectory/TrajectoryVisualizationService.cs
@@ -54,4 +54,5 @@ namespace AsbCloudInfrastructure.Services.Trajectory
             return cartesianCoordinates;
         }
     }
+#nullable disable
 }
diff --git a/AsbCloudInfrastructure/Services/WellOperationService/ScheduleReportService.cs b/AsbCloudInfrastructure/Services/WellOperationService/ScheduleReportService.cs
index 7d2763b8..703d815f 100644
--- a/AsbCloudInfrastructure/Services/WellOperationService/ScheduleReportService.cs
+++ b/AsbCloudInfrastructure/Services/WellOperationService/ScheduleReportService.cs
@@ -1,4 +1,5 @@
 using AsbCloudApp.Data;
+using AsbCloudApp.Exceptions;
 using AsbCloudApp.Services;
 using AsbCloudDb.Model;
 using ClosedXML.Excel;
@@ -11,6 +12,7 @@ using System.Threading.Tasks;
 
 namespace AsbCloudInfrastructure.Services.WellOperationService
 {
+#nullable enable
     public class ScheduleReportService : IScheduleReportService
     {
         private readonly IOperationsStatService operationsStatService;
@@ -29,11 +31,11 @@ namespace AsbCloudInfrastructure.Services.WellOperationService
         {
             var tvd = await operationsStatService.GetTvdAsync(idWell, token);
 
-            if (!tvd.Any())
-                return null;
-
             var well = await wellService.GetOrDefaultAsync(idWell, token);
 
+            if(well is null)
+                throw new ArgumentInvalidException("idWell doesn`t exist", nameof(idWell));
+
             var ecxelTemplateStream = GetExcelTemplateStream();
             using var workbook = new XLWorkbook(ecxelTemplateStream, XLEventTracking.Disabled);
             FillScheduleSheetToWorkbook(workbook, tvd, well);
@@ -236,9 +238,9 @@ namespace AsbCloudInfrastructure.Services.WellOperationService
                 ? operation.DateStart.AddHours(operation.DurationHours)
                 : default;
 
-            var endDatePlan = GetEndDate(planLast);
-            var endDateFact = GetEndDate(factLast);
-            var endDatePredict = GetEndDate(predictLast);
+            var endDatePlan = planLast is not null ? GetEndDate(planLast) : default;
+            var endDateFact = factLast is not null ? GetEndDate(factLast) : default;
+            var endDatePredict = predictLast is not null ? GetEndDate(predictLast) : default;
 
             var endDate = endDatePredict > endDateFact
                 ? endDatePredict
@@ -301,7 +303,7 @@ namespace AsbCloudInfrastructure.Services.WellOperationService
             return cell;
         }
 
-        private static IXLCell SetCell(IXLRow row, int colunm, object value)
+        private static IXLCell SetCell(IXLRow row, int colunm, object? value)
         {
             var cell = row.Cell(colunm);
             cell.Value = value;
@@ -330,8 +332,9 @@ namespace AsbCloudInfrastructure.Services.WellOperationService
         private static Stream GetExcelTemplateStream()
         {
             var stream = System.Reflection.Assembly.GetExecutingAssembly()
-                .GetManifestResourceStream("AsbCloudInfrastructure.Services.WellOperationService.ScheduleReportTemplate.xlsx");
+                .GetManifestResourceStream("AsbCloudInfrastructure.Services.WellOperationService.ScheduleReportTemplate.xlsx")!;
             return stream;
         }
     }
+#nullable disable
 }
diff --git a/AsbCloudWebApi/Controllers/MeasureController.cs b/AsbCloudWebApi/Controllers/MeasureController.cs
index bbfebcf6..dac77733 100644
--- a/AsbCloudWebApi/Controllers/MeasureController.cs
+++ b/AsbCloudWebApi/Controllers/MeasureController.cs
@@ -44,7 +44,7 @@ namespace AsbCloudWebApi.Controllers
             if (!await CanUserAccessToWellAsync(idWell, token).ConfigureAwait(false))
                 return Forbid();
 
-            var result = await measureService.GetLastAsync(idWell, idCategory, token).ConfigureAwait(false);
+            var result = await measureService.GetLastOrDefaultAsync(idWell, idCategory, token).ConfigureAwait(false);
             return Ok(result);
         }