水井钻井工可能会专注于一个特定的钻探方法，如电缆，旋转，钻，锤或反向循环钻探。
Water well drillers may specialize in a specific method of drilling, such as cable, rotary, auger, hammer or reverse circulation drilling.
是常规钻井泥浆循环方式的重大变革。
It is a big change to conventional way of drilling mud circulation.
提出了一种减小钻井泥浆环空循环压耗的井下工具，介绍了该工具的结构、工作原理、技术参数。
Therefore, a downhole tool that can reduce the annular cyclic pressure loss and introduced its structure, principle of work and technical parameters were put forward.
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