How the Top Drive System works By DrillingFormulas.Com | February 28, 2016 - 3:17 pm |February 7, 2017 Oil Field Videos, Rig Equipment Leave a comment This video shows detailed about top drive from Varco with a lot of operation aspect and it will help you learn a lot of details about Top Drive. We already add full the video transcript in order to help people understand all details. Continue reading →