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Geosteering Target Analysis for Directional Drilling

Talis, Mohamad Javad | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 54289 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Jamshidi, Saeed
  7. Abstract:
  8. The technique of geosteering has been widely adopted within the petroleum industry for proper wellbore positioning through involving predicting the geology ahead of the bit, furthermore, the advantages of this technique became more pronounced as drilling environments became more complex. the fundamental concept of geosteering is to put and maintain the well within the target zone(s), so as to promote safe and economical production of the well. Geosteering-related technologies, like downhole information-gathering tools and real time data transmission and data analysis applications, are continuously and significantly improved to support geosteering decisions.This study demonstrates how the use of geosteering software (GEOMASTER), to continually update the geological model while drilling, helps to boost optimal well placement, as well as reviews the practical aspects of geosteering. Also it reviews and examines the alternative approaches and methodologies. More over a decision-driven approach to the geosteering process is also discussed
  9. Keywords:
  10. Geo-Steer Drilling ; Logging While Drilling ; Horizontal Wells ; Measurement While Drilling (MWD) ; Geological Structural Model Strat-Based ; Directional Drilling

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  • Abstract
  • 1 Introduction
  • 2 Measurement-While-Drilling (MWD) Fundamentals
    • 2.1 BHA Orientation – Tool Face
      • 2.1.1 The Magnetic Tool Face
      • 2.1.2 Gravity Tool Face
    • 2.2 Wellbore Surveying
  • 3 Uncertainties:
    • 3.1 Geological uncertainties:
    • 3.2 Wellbore position uncertainties:
  • 4 Sensors of Geosteering
    • 4.1 Reactive and proactive Geosteering.
    • 4.2 Geosteering Tools and Techniques
      • 4.2.1 Propagation Resistivity Tools
      • 4.2.2 Traditional Propagation Resistivity Tools – Traditional
      • 4.2.3 deep azimuthal resistivity images
      • 4.2.4 The Geosignal measurement
      • 4.2.5 Gamma Ray Tools
      • 4.2.6 Density Tools
      • 4.2.7 Neutron Porosity Tools
      • 4.2.8 Acoustic Tools
      • 4.2.9 Nuclear Magnetic Resonance NMR measurements
      • 4.2.10 Rate of Penetration (ROP)
      • 4.2.11 Formation Pressure and Sampling Tools
  • 5 Geosteering Workflow
    • 5.1 Decision Analytics for Geosteering Operations
      • Intelligent Geosteering Decision Advisor Framework
    • 5.2 Objectives of Geosteering Operations
  • 6 Methods of Geosteering
    • 6.1 model based
    • 6.2 stratification based
      • Layer thicknesses between lateral and type well log
    • 6.3 Real-Time Dip Determination from Azimuthal Measurements
      • Image Color Scaling
      • Using images to calculate the relative angle between a layer and borehole
      • Using dip to calculate layer thickness
      • Formation evaluation from Images while drilling
    • 6.4 Direct resistivity modeling and resistivity inversion
    • Proactive geosteering
    • 6.1 Geosteering based on cuttings
  • 7 Case study
    • 7.1 GeoMaster Software
    • 7.2 Import Data:
    • 7.3 Geosteering Interpretation
      • GeoMaster windows
      • Types of scale
    • 7.4 RESULTS
  • 8 Conclusion
  • 9 References
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