The CHAMP packer includes two types, CHAMP IV packer & CHAMP V packer, which is applied for the drill stem testing operation for the well testing, and the CHAMP packer is the retrievable packer and serve in high pressure and high temperature working condition. The DST string includes RTTS packer, RTTS circulating valve, Tubing string Testing valve, OMNI valve, Select tester valve, CHAMP PACKER, Drain valve etc.