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
Safe
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
Simple
Memory based, battery powered instruments; no wireline required
Logs acquired through drill collar during normal pipe trip
Efficient
Allows logging of problematic, vertical, 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
