LWT™ Logging While Tripping™ - Datalog

By: Datalog Technology  09-12-2011
Keywords: logging, Formation Evaluation

Logging While Tripping (LWT) is a patented formation evaluation technique in which quality open hole logs are acquired in a method that is more cost effective, uses less rig time,  and has fewer inherent risks than wireline, drill pipe conveyed, or logging-while-drilling methods.  LWT allows open hole logs to be acquired inhorizontal and hostile hole conditions where logging was previously impossible or uneconomic.


  • Tools and radioactive sources safely located inside collar and retrievable
  • Full well control including pipe rotation and circulation during logging

Cost Effective

  • Significant rig time savings over wireline or pipe conveyed logging
  • Costs less than rig time used in methods requiring separate pipe trips
  • Considerably more economic than LWD data acquisition
  • Satisfies regulatory requirements
  • Provides complete formation evaluation


  • Memory based, battery powered instruments; no wireline required
  • Logs acquired through composite collar during normal pipe trip


  • Allows logging of problematic, directional, and horizontal wells
  • Minimal impact on drilling operations (collar inserted behind bit at any time)
  • No extra pipe trip required for insertion of LWT collar
  • No hole conditioning required
  • Compact equipment and small crew operation

Keywords: Formation Evaluation, logging

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