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如果含水层的静水位离孔口相当低,就会发生冲洗液部分或全部漏失。当遇到厚的含水层或大空洞时,有时不能成功地处理好冲洗液严重漏失。在此种情况下,在钻进过程中采用沉没泵作冲洗液局部(孔底)循环是比较合理的。沉没泵一般采用液动的或气动的。用气举泵最可靠,钻进时用它作局部反循环,钻孔中的液柱高度可超过50～60米。气举装置如附图。在钻杆2上连接扬水管4,再在管4里接输气软管5。混合器6沉没在孔内水位以
If the aquifer’s still water level is rather low from the orifice, a partial or total loss of flushing liquid will occur. In the event of thick aquifers or large voids, sometimes serious failure to properly handle flushing fluid is lost. In this case, it is reasonable to use a submerged pump as a part of the rinsing liquid (hole bottom) circulation during drilling. Sinking pumps are generally hydraulic or pneumatic. The most reliable gas-lift pump, drilling it with local reverse circulation, drilling fluid column height can exceed 50 to 60 meters. Airlift device as the picture. Connect the pumping pipe 4 to the drill pipe 2, and then connect the gas hose 5 to the pipe 4. The mixer 6 sinks in the hole to level