diff --git a/AsbCloudDb/Model/WellOperation.cs b/AsbCloudDb/Model/WellOperation.cs
index 9926f0b1..06b330df 100644
--- a/AsbCloudDb/Model/WellOperation.cs
+++ b/AsbCloudDb/Model/WellOperation.cs
@@ -66,7 +66,7 @@ namespace AsbCloudDb.Model
 
         [JsonIgnore]
         [ForeignKey(nameof(IdPlan))]
-        public virtual WellOperation? OperationPlan { get; set; } = null!;
+        public virtual WellOperation? OperationPlan { get; set; }
     }
 
 }
diff --git a/AsbCloudInfrastructure/Services/WellOperationService/OperationsStatService.cs b/AsbCloudInfrastructure/Services/WellOperationService/OperationsStatService.cs
index 638232f3..87fdc3a2 100644
--- a/AsbCloudInfrastructure/Services/WellOperationService/OperationsStatService.cs
+++ b/AsbCloudInfrastructure/Services/WellOperationService/OperationsStatService.cs
@@ -420,46 +420,20 @@ public class OperationsStatService : IOperationsStatService
 
     public async Task<IEnumerable<PlanFactPredictBase<WellOperationDto>>> GetTvdAsync(int idWell, CancellationToken token)
     {
-        var wellOperations = await db.WellOperations
-            .Include(o => o.OperationCategory)
-            .Include(o => o.WellSectionType)
-            .Include(o => o.OperationPlan)
-            .Where(o => o.IdWell == idWell)
-            .OrderBy(o => o.DateStart)
-            .ThenBy(o => o.DepthEnd)
-            .AsNoTracking()
-            .ToListAsync(token)
-            .ConfigureAwait(false);
-
-        var wellOperationsPlan = wellOperations
-            .Where(o => o.IdType == WellOperation.IdOperationTypePlan)
-            .OrderBy(o => o.DateStart)
-            .ThenBy(o => o.DepthEnd);
-
-        var wellOperationsFact = wellOperations
-            .Where(o => o.IdType == WellOperation.IdOperationTypeFact)
-            .OrderBy(o => o.DateStart)
-            .ThenBy(o => o.DepthEnd);
-
-        var sectionsIds = wellOperations
-            .Select(o => o.IdWellSectionType)
-            .Distinct();
-
-        var tzOffsetHours = wellService.GetTimezone(idWell).Hours;
-
-        var merged = MergeArraysBySections(sectionsIds, wellOperationsPlan, wellOperationsFact).ToList();
-        if (merged.Count ==0)
+        var wellOperations = (await GetOperationsAsync(idWell, token)).ToArray();
+        if (!wellOperations.Any())
             return Enumerable.Empty<PlanFactPredictBase<WellOperationDto>>();
-
-        var tvd = new List<PlanFactPredictBase<WellOperationDto>>(merged.Count);
-        var (Plan, Fact) = merged.FirstOrDefault();
+        
+        var tzOffsetHours = wellService.GetTimezone(idWell).Hours;
+        var tvd = new List<PlanFactPredictBase<WellOperationDto>>(wellOperations.Length);
+        var (Plan, Fact) = wellOperations.FirstOrDefault();
         var dateStart = Plan?.DateStart ?? Fact!.DateStart;
         int? iLastMatch = null;
         int iLastFact = 0;
         var nptHours = 0d;
-        for (int i = 0; i < merged.Count; i++)
+        for (int i = 0; i < wellOperations.Length; i++)
         {
-            var item = merged[i];
+            var item = wellOperations[i];
             var plan = item.Plan;
             var fact = item.Fact;
 
@@ -483,23 +457,23 @@ public class OperationsStatService : IOperationsStatService
                 iLastFact = i;
             }
 
-            tvd.Add(planFactPredict);                    
+            tvd.Add(planFactPredict);  
         }
 
-        if (iLastMatch is null || iLastMatch == merged.Count - 1)
+        if (iLastMatch is null || iLastMatch == wellOperations.Length - 1)
             return tvd;
 
-        var lastMatchPlan = merged[iLastMatch.Value].Plan!;
+        var lastMatchPlan = wellOperations[iLastMatch.Value].Plan!;
         var lastMatchPlanOperationEnd = lastMatchPlan.DateStart.AddHours(lastMatchPlan.DurationHours);
-        var lastFact = merged[iLastFact].Fact!;
+        var lastFact = wellOperations[iLastFact].Fact!;
         var lastFactDateEnd = lastFact.DateStart.AddHours(lastFact.DurationHours);
         var startOffset = lastFactDateEnd - lastMatchPlanOperationEnd;
 
-        for (int i = iLastMatch.Value + 1; i < merged.Count; i++)
+        for (int i = iLastMatch.Value + 1; i < wellOperations.Length; i++)
         {
-            if (merged[i].Plan is null)
+            if (wellOperations[i].Plan is null)
                 continue;
-            var predict = Convert(merged[i].Plan!, tzOffsetHours);
+            var predict = Convert(wellOperations[i].Plan!, tzOffsetHours);
             predict.IdType = 2;
             predict.DateStart = predict.DateStart + startOffset;
             predict.Day = (predict.DateStart - dateStart).TotalDays;
@@ -509,33 +483,33 @@ public class OperationsStatService : IOperationsStatService
         return tvd;
     }
 
-    private static IEnumerable<(WellOperation? Plan, WellOperation? Fact)> MergeArraysBySections(
-        IEnumerable<int> sectionsIds,
-        IOrderedEnumerable<WellOperation> wellOperationsPlan,
-        IOrderedEnumerable<WellOperation> wellOperationsFact)
+    private async Task<IEnumerable<(WellOperation? Plan, WellOperation? Fact)>> GetOperationsAsync(int idWell, CancellationToken token)
     {
-        var merged = new List<(WellOperation? Plan, WellOperation? Fact)>(wellOperationsPlan.Count());
-        foreach (var sectionId in sectionsIds)
-        {
-            var sectionOperationsPlan = wellOperationsPlan
-                .Where(o => o.IdWellSectionType == sectionId);
-            var sectionOperationsFact = wellOperationsFact
-                .Where(o => o.IdWellSectionType == sectionId);
-            var sectionMerged = MergeArrays(sectionOperationsPlan, sectionOperationsFact);
-            merged.AddRange(sectionMerged);
-        }
-        return merged;
-    }
+        var query = db.WellOperations
+            .Include(o => o.OperationCategory)
+            .Include(o => o.WellSectionType)
+            .Where(o => o.IdWell == idWell)
+            .OrderBy(o => o.DateStart)
+            .ThenBy(o => o.DepthEnd);
 
-    private static IEnumerable<(WellOperation? Plan, WellOperation? Fact)> MergeArrays(IEnumerable<WellOperation> operationsPlan, IEnumerable<WellOperation> operationsFact)
-    {
-        var operationsFactWithNoPlan = operationsFact.Where(x => x.IdPlan == null).ToArray();
-        var operationsFactWithPlan = operationsFact.Where(x => x.IdPlan != null).ToArray();
+        var operationsFactWithNoPlan = await query.Where(o => o.IdPlan == null && o.IdType == WellOperation.IdOperationTypeFact)
+            .AsNoTracking()
+            .ToArrayAsync(token);
 
-        var idsPlanWithFact = operationsFact.Where(x => x.IdPlan is not null).Select(x => x.IdPlan).Distinct();
-        var operationsPlanWithNoFact = operationsPlan.Where(x => !idsPlanWithFact.Contains(x.IdPlan)).ToArray();
+        var operationsFactWithPlan = await query.Where(o => o.IdPlan != null && o.IdType == WellOperation.IdOperationTypeFact)
+            .Include(o => o.OperationPlan)
+            .ThenInclude(o => o!.WellSectionType)
+            .Include(o => o.OperationPlan)
+            .ThenInclude(o => o!.OperationCategory)
+            .AsNoTracking()
+            .ToArrayAsync(token);
 
-        var result = new List<(WellOperation? Plan, WellOperation? Fact)>(operationsFactWithNoPlan.Length + operationsFactWithPlan.Length + operationsPlanWithNoFact.Length);
+        var idsPlanWithFact = operationsFactWithPlan.Select(o => o.IdPlan).Distinct();
+        var operationsPlanWithNoFact = await query
+            .Where(o => o.IdType == WellOperation.IdOperationTypePlan && !idsPlanWithFact.Contains(o.IdPlan)).ToArrayAsync(token);
+
+        var capacity = operationsFactWithNoPlan.Length + operationsFactWithPlan.Length + operationsPlanWithNoFact.Length;
+        var result = new List<(WellOperation? Plan, WellOperation? Fact)>(capacity);
 
         foreach (var operation in operationsFactWithPlan)
             result.Add((operation.OperationPlan, operation));
diff --git a/AsbCloudWebApi/Controllers/OperationStatController.cs b/AsbCloudWebApi/Controllers/OperationStatController.cs
index 7126c5f5..81a9431f 100644
--- a/AsbCloudWebApi/Controllers/OperationStatController.cs
+++ b/AsbCloudWebApi/Controllers/OperationStatController.cs
@@ -1,4 +1,5 @@
-using AsbCloudApp.Data;
+using System;
+using AsbCloudApp.Data;
 using AsbCloudApp.Services;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
@@ -150,9 +151,8 @@ namespace AsbCloudWebApi.Controllers
         {
             if (!await CanUserAccessToWellAsync(idWell, token).ConfigureAwait(false))
                 return Forbid();
-
-            var result = await operationsStatService.GetTvdAsync(idWell, token)
-                .ConfigureAwait(false);
+            
+            var result = await operationsStatService.GetTvdAsync(idWell, token);
             return Ok(result);
         }