Validating a new azimuthal LWD sensor

摘要

A new azimuthal deep-resistivity logging-while-drilling (LWD) sensor can detect events as far as 18 ft (5.5 m) laterally from a wellbore path and help determine the direction to the approaching event. In recent years, advances in well placement have taken place simultaneously along two complementary technological fronts: drilling and LWD. On the drilling side, the positioning of the bit in 3-D space has become more precise thanks to the advent and evolution of rotary steer-ables. On the LWD side, modern sensors capable of deeper reading and higher resolution combined with advanced forward and inverse modeling have helped better determine the location of the bottomhole assembly with respect to reservoir boundaries and, notably, hydrocarbon contacts.