diff --git a/AsbCloudInfrastructure/Services/WellService.cs b/AsbCloudInfrastructure/Services/WellService.cs
index 7645c0aa..01f9cb32 100644
--- a/AsbCloudInfrastructure/Services/WellService.cs
+++ b/AsbCloudInfrastructure/Services/WellService.cs
@@ -126,8 +126,11 @@ namespace AsbCloudInfrastructure.Services
             return wells;
         }
 
-        public override async Task<int> InsertAsync(WellDto dto, CancellationToken token = default)
+        public override async Task<int> InsertAsync(WellDto dto, CancellationToken token)
         {
+            if (await IsExistingTelemetryAsync(dto.IdTelemetry, token))
+                throw new ArgumentInvalidException("Телеметрия уже была привязана к другой скважине.", nameof(dto));
+            
             if (dto.IdWellType is < 1 or > 2)
                 throw new ArgumentInvalidException("Тип скважины указан неправильно.", nameof(dto));
 
@@ -158,8 +161,11 @@ namespace AsbCloudInfrastructure.Services
         }
 
         public override async Task<int> UpdateAsync(WellDto dto,
-            CancellationToken token = default)
+            CancellationToken token)
         {
+            if (await IsExistingTelemetryAsync(dto.IdTelemetry, token))
+                throw new ArgumentInvalidException("Телеметрия уже была привязана к другой скважине.", nameof(dto));
+            
             if (dto.IdWellType is < 1 or > 2)
                 throw new ArgumentInvalidException("Тип скважины указан неправильно.", nameof(dto));
 
@@ -335,6 +341,15 @@ namespace AsbCloudInfrastructure.Services
             throw new Exception($"Can't find timezone for well {wellDto.Caption} id: {wellDto.Id}");
         }
 
+        private Task<bool> IsExistingTelemetryAsync(int? idTelemetry, CancellationToken cancellationToken)
+        {
+            if (!idTelemetry.HasValue)
+                return Task.FromResult(false);
+            
+            return dbSet.AnyAsync(x => x.IdTelemetry == 
+                                       idTelemetry.Value, cancellationToken);
+        }
+
         private static AsbCloudDb.Model.IMapPoint GetCoordinates(Well well)
         {
             if (well is null)