美国Ｔｅｓｃｏ公司公布了一种享有专利权的钻井工艺,即在钻井过程中以套管作载体,直接与钻井马达总成和钻头连接,井下工具用钢丝绳下入井内,并与套管最后一个接头锁扣住。这种新的套管钻井工艺省去了起下钻、移送或再连接钻杆花费的时间。套管下井后永远保留在井内,因此?.. Tesco Corporation of the United States announced a patented drilling technology that is used in the drilling process casing as a carrier, directly connected with the drilling motor assembly and drill bit, downhole tool with wire rope into the well, and the last joint of the sleeve Locked. This new casing drilling process eliminates the time it takes to drill, transfer or reconnect the drill pipe. The casing will remain in the well forever after it goes down, so?