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West-Siberia, Russia. Drilling in unconventional reservoir

West-Siberia, Russia. Drilling in unconventional reservoir
  • Drilling the first horizontal wells in the Bazhen – Abalak formations 
  • Steering the well into the sweet spot  
  • Minimizing drilling risks and NPT 
Компания Геонафт
+7 (499) 322-27-19

Goal 

  • Drilling the first horizontal wells in the Bazhen – Abalak formations 
  • Steering the well into the sweet spot  
  • Minimizing drilling risks and NPT 

Challenges 

  • Inefficient Shale swelling inhibition by the drilling mud. 
  • Chemical instability of shales 
  • Regular log interpretation methodologies cannot be applied 
  • Zones with abnormally high pore pressure 
  • Target reservoir is the unconventional Bazhen formation   

Technical solutions 

Introduction of an extended logging set (determined intervals based on nuclear-magnetic logging and intervals with HC content based on dielectric dispersion multifrequency method) for identification of fluid and reservoir properties 

Application of high-resolution core thermal profiling  

Integrated approach of Geosteering, Petrophysics and Geomechanics during drilling in real-time based on LWD data 

Results 

  • Successful drilling of the first horizontal wells in the Bazhen - Abalak formations of the oilfield.  
  • As a result of avoiding unstable Abalak formations, no NPT due WB instability was detected 
  • The company goals on production were reached by maximizing sweet spot coverage thought trajectory correction in real-time. 
  • Low permeability formation was studied, and its data used by the company for the future developments  
  • The HF ports were located based on extended logs interpretation and for maximizing targeting the areas with high HC saturation.  

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