摘要
This article introduces the evolution process of the core drilling methods used in Wenchuan Earthquake Scientific Drilling Project.From PDM / hydro-hammer coring method to top-drive / wire-line coring method and finally to PDM / hydrohammer / long split barrel coring method,the coring methods used in this project underwent a series of changes.The main reasons for these changes are formation conditions,coring technology improvement and the development.