Kansas Geological Survey, Open-file Report 2000-2
Horizontal Drilling in Kansas: Current Status and Case Histories
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Definitions & Terms--Classification of Horizontal Wells

• Traditionally
  • Long - Medium - Short - Ultrashort
  • No API Standard
• Currently
  • Classified by Bend Rate of Curve
    • 2°-8° / 100 Ft.--Long Radius
    • 8°-35° / 100 Ft.--Medium Radius
    • 1/2°-2° / Ft.--Short Radius
• Determines:
  • Lateral Length
  • Steering Method
  • Completion Technique
  • Treatment Methods

MWD--"Measurement While Drilling"

Azimuth, Inclination, Measured Depth

LWD--"Logging While Drilling"

most standard vertical hole e-logs

PIF--"Productivity Improvement Factor"

multiplier of production increase over offset vertical wells

Basic Horizontal Well Profiles

Kansas Geological Survey, Petroleum Research Section
Updated January 2000
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