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Volga region, Russia. First extended reach drilling in region.

Volga region, Russia. First extended reach drilling in region.
  • Drilling of the first ERD well in the region with complex tectonics including rock properties anisotropy, presence of salt and reactive shale.  
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Goal 

Drilling of the first ERD well in the region with complex tectonics including rock properties anisotropy, presence of salt and reactive shale.  

Challenges 

  • The first very extended reach drilling in the region.  
  • Catastrophic instability of shales drilled parallel to bedding  
  • Shale formation prone to breakouts 
  • Multiple drilling issues including loss of wells, key seating, mud loss, BHA loss 
  • Geologically challenging reservoir with uncertainty of formation dip and potential faults 

Technical solutions 

  • Estimation of wellbore stability windows and correction of initially planned trajectory and well completion design. 
  • Choosing the optimal BHA 
  • 24/7 real-time geomechanical and geological support during drilling 
  • Proactive risk control during drilling, cementing and completion  

Results 

  • The first horizontal well in the region in complex formation structure 
  • The first ERD in the region successfully performed without NPT due to WB instability 
  • Achieving of geologic goals in time, regardless of geologic challenges 
  • Significant production increase in comparison with vertical and directional wells 

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