LWT Introduction


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 in horizontal and hostile hole conditions where logging was previously impossible or uneconomic.

LWT - Logging While Tripping Advantages


  • 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