diff --git a/AsbCloudApp/Services/ITelemetryAnalyticsService.cs b/AsbCloudApp/Services/ITelemetryAnalyticsService.cs
index 04a9ec2a..37e42ef4 100644
--- a/AsbCloudApp/Services/ITelemetryAnalyticsService.cs
+++ b/AsbCloudApp/Services/ITelemetryAnalyticsService.cs
@@ -24,5 +24,7 @@ namespace AsbCloudApp.Services
             int intervalHoursTimestamp, int workBeginTimestamp,
             CancellationToken token = default);
         void SaveAnalytics(DataSaubBaseDto dataSaub);
+        Task<DatesRangeDto> GetOperationsDateRangeAsync(int idWell,
+            CancellationToken token = default);
     }
 }
diff --git a/AsbCloudInfrastructure/Services/TelemetryAnalyticsService.cs b/AsbCloudInfrastructure/Services/TelemetryAnalyticsService.cs
index 99462fa9..945a15e3 100644
--- a/AsbCloudInfrastructure/Services/TelemetryAnalyticsService.cs
+++ b/AsbCloudInfrastructure/Services/TelemetryAnalyticsService.cs
@@ -260,6 +260,36 @@ namespace AsbCloudInfrastructure.Services
             }
         }
 
+        public async Task<DatesRangeDto> GetOperationsDateRangeAsync(int idWell,
+            CancellationToken token = default)
+        {
+            var telemetryId = telemetryService.GetIdTelemetryByIdWell(idWell);
+
+            if (telemetryId is null)
+                return null;
+
+            var datesRange = await (from d in db.TelemetryAnalysis
+                                    where d.IdTelemetry == telemetryId
+                                    select d.UnixDate).DefaultIfEmpty()
+                                    .GroupBy(g => true)
+                                    .AsNoTracking()
+                                    .Select(g => new
+                                    {
+                                        From = g.Min(),
+                                        To = g.Max()
+                                    }).OrderBy(gr => gr.From)
+                                    .FirstOrDefaultAsync(token)
+                                    .ConfigureAwait(false);
+
+            return new DatesRangeDto
+            {
+                From = DateTimeOffset.FromUnixTimeSeconds(datesRange.From).DateTime,
+                To = datesRange.To == default 
+                    ? DateTime.MaxValue
+                    : DateTimeOffset.FromUnixTimeSeconds(datesRange.To).DateTime
+            };
+        }
+
         private static IEnumerable<(long IntervalStart, string OperationName, int OperationDuration)> DivideOperationsByIntervalLength(
             IEnumerable<(long IntervalStart, string OperationName, int OperationDuration)> operations, int intervalSeconds)
         {
@@ -267,41 +297,41 @@ namespace AsbCloudInfrastructure.Services
 
             var operationDurationTimeCounter = 0;
 
-            foreach (var op in operations)
+            foreach (var (IntervalStart, OperationName, OperationDuration) in operations)
             {
-                if (op.OperationDuration < (intervalSeconds - operationDurationTimeCounter))
+                if (OperationDuration < (intervalSeconds - operationDurationTimeCounter))
                 {
-                    splittedOperationsByInterval.Add((op.IntervalStart, op.OperationName, op.OperationDuration));
-                    operationDurationTimeCounter += op.OperationDuration;
+                    splittedOperationsByInterval.Add((IntervalStart, OperationName, OperationDuration));
+                    operationDurationTimeCounter += OperationDuration;
                 }
                 else
                 {   // if operation duration overflows current interval it shoud be divided into 2 or more parts for this and next intervals
                     var remainingIntervalTime = intervalSeconds - operationDurationTimeCounter;
-                    splittedOperationsByInterval.Add((op.IntervalStart, op.OperationName, remainingIntervalTime)); // first part of long operation
+                    splittedOperationsByInterval.Add((IntervalStart, OperationName, remainingIntervalTime)); // first part of long operation
 
-                    var operationDurationAfterDividing = op.OperationDuration - remainingIntervalTime; // second part of long operation. Can be less or more than interval
+                    var operationDurationAfterDividing = OperationDuration - remainingIntervalTime; // second part of long operation. Can be less or more than interval
 
                     // If operation duration even after dividing is still more than interval,
                     // it should be divided several times to several intervals.
                     if (operationDurationAfterDividing > intervalSeconds)
                     {
                         var counter = 0;
-                        var updatedIntervalStartTime = op.IntervalStart + remainingIntervalTime;
+                        var updatedIntervalStartTime = IntervalStart + remainingIntervalTime;
 
                         while (operationDurationAfterDividing > intervalSeconds)
                         {
-                            splittedOperationsByInterval.Add((updatedIntervalStartTime + intervalSeconds * counter, op.OperationName, intervalSeconds));
+                            splittedOperationsByInterval.Add((updatedIntervalStartTime + intervalSeconds * counter, OperationName, intervalSeconds));
                             operationDurationAfterDividing -= intervalSeconds;
                             counter++;
                         }
 
-                        splittedOperationsByInterval.Add((updatedIntervalStartTime + operationDurationAfterDividing, op.OperationName, operationDurationAfterDividing));
+                        splittedOperationsByInterval.Add((updatedIntervalStartTime + operationDurationAfterDividing, OperationName, operationDurationAfterDividing));
 
                         operationDurationTimeCounter = operationDurationAfterDividing;
                     }
                     else
                     {
-                        splittedOperationsByInterval.Add((op.IntervalStart, op.OperationName, operationDurationAfterDividing));
+                        splittedOperationsByInterval.Add((IntervalStart, OperationName, operationDurationAfterDividing));
                         operationDurationTimeCounter = operationDurationAfterDividing;
                     }
                 }
diff --git a/AsbCloudWebApi/Controllers/TelemetryAnalyticsController.cs b/AsbCloudWebApi/Controllers/TelemetryAnalyticsController.cs
index 4650705c..7880e039 100644
--- a/AsbCloudWebApi/Controllers/TelemetryAnalyticsController.cs
+++ b/AsbCloudWebApi/Controllers/TelemetryAnalyticsController.cs
@@ -170,5 +170,32 @@ namespace AsbCloudWebApi.Controllers
 
             return Ok(analytics);
         }
+
+        /// <summary>
+        /// Возвращает даты первой и последней операций на скважине
+        /// </summary>
+        /// <param name="idWell">id скважины</param>
+        /// <param name="token">Токен для отмены задачи</param>
+        /// <returns>Даты самой первой и самой последней операций на скважине</returns>
+        [HttpGet]
+        [Route("datesRange")]
+        [ProducesResponseType(typeof(DatesRangeDto), (int)System.Net.HttpStatusCode.OK)]
+        public async Task<IActionResult> GetOperationsDateRangeAsync(int idWell,
+            CancellationToken token = default)
+        {
+            int? idCompany = User.GetCompanyId();
+
+            if (idCompany is null)
+                return Forbid();
+
+            if (!await wellService.IsCompanyInvolvedInWellAsync((int)idCompany,
+                idWell, token).ConfigureAwait(false))
+                return Forbid();
+
+            DatesRangeDto wellOperationsDatesRange = await analyticsService.GetOperationsDateRangeAsync(idWell,
+                token).ConfigureAwait(false);
+
+            return Ok(wellOperationsDatesRange);
+        }
     }
 }