11. Today s challenges in ERD are hole cleaning, managing the mechanical loads on the drill string and managing downhole pressure. 12. Precautions have to be taken to redirect falling drill cuttings away from the machine, and to reinforce the drill string . 13. Dry drilling can also cause severe damage to the drill string , including snapping the pipe, and the drilling rig itself. 14. The first commercial deployment of a drill string telemetry network occurred using IntelliServ s product in Myanmar in December 2006. 15. Retrievable tools, sometimes known as " Slim Tools ", can be retrieved and replaced using wireline through the drill string . 16. Pulling the drill string out of or running the drill string into the hole is referred to as "'tripping " '. 17. Pulling the drill string out of or running the drill string into the hole is referred to as "'tripping " '. 18. In short the longer the gap between the near bit and the drill string stabilizer the greater the angle building rate. 19. A segment is added by pulling the mousehole ), and then screwing this assembly into the top of the existing drill string . 20. A good crew can pull a " stand " ( move the drill string up by 90ft ) about every 5 minutes.
