在處理孔內擠夾鑽具事故時,往往最后剩下一段不太長的粗徑鑽具,因為擠夾的更緊,不易把它取上。這時一般處理方法是用起重機起拔,或用切管器切斷,甚至用鑽頭消滅。這些方法下僅要化費很長時間,付出很大體力勞動,而且有時还不可靠。採用同徑擴孔法,則可以大大减輕體力勞動,縮短處理時間,降低成本,並且很可靠。同徑擴孔一般稱為“半拉爪”擴孔,是處理擠夾鑽具事故的方法之一。當事故鑽具長度不超過0.7公尺,擴孔處的地层為6級以下岩石,不管用合金或鑽粒鑽進的孔都可擴。如果故障鑽具很長,已被切割器切成幾節仍不能取上,也可用此方法擴開一節取出一 In dealing with the hole squeeze drill accident, often the last of a long section of not too long diameter drill, because the clamp is more tight, it is not easy to pick it up. At this point the general approach is to use the crane to pull up, or cut off with the pipe cutter, and even use the drill to eliminate. These methods only cost a long time, a lot of manual labor, and sometimes not reliable. With the same diameter hole method, you can greatly reduce manual labor, shorten the processing time and reduce costs, and very reliable. The same diameter reaming commonly known as “half-claw” reaming, is to deal with squeeze-pinch drill one of the ways. When the accident drill length of no more than 0.7 meters, reaming at the formation of rock below 6, regardless of alloy or drill holes can be expanded. If the fault drill is very long, has been cut into sections can not be cut, you can also use this method to expand a section out of a