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我支队从1981年开始进行砂钻施工。钻孔一般较浅,使用冲击钻进法,几小时便可钻完一个孔。但起拔套管却是一大难题,如用升降机直接拉起,常由于管子被夹得过紧而起拉不动。许多现场不得不用手压泵驱动千斤顶顶活套管后,再用升降机将其拉到地面。但顶活套管的工序,约需3～4人,几小时才能完成,如用增压器代替手压泵工作,情况虽有改善,但操作仍比较麻烦,效率也不高。为此,许多使用汽车钻的现场,只好钻完一个孔
My detachment started the construction of sand drill in 1981. Drilling generally shallow, the use of impact drilling method, a few hours can drill a hole. However, pulling the casing is a major problem. For example, the elevator is pulled up directly, often because the pipe is too tightly clamped and can not move. Many sites had to use hand-pressure pump drive jack jacking, and then lift it to the ground. However, the process of top live bushing about 3 to 4 people, a few hours to complete, such as using turbocharger instead of hand pump work, although the situation has improved, but the operation is still too much trouble, the efficiency is not high. To this end, many car drilling site, had drilled a hole