The Core Drilling Technology Used in the Borehole WFSD-4 of Wenchuan Earthquake Fault Scientific Drilling Project

Abstract:

In this article the core drilling operation of the borehole WFSD-4 of Wenchuan earthquake fault scientific drilling project has been described，and the core drilling technology and technical measures to solve the problems encountered while drilling in broken rock formation and strong borehole shrinkage condition have been analyzed and summarized. The application results of the core drilling technology and technical measures have been introduced.