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shuang bi zuan ju qi ju fan xun huan zuan jin gong yi
Author(s): 
Pages: 208-210
Year: Issue:  4
Journal: Underground Water

Keyword:  气举反循环钻进双壁钻具钻进工艺水文水井钻探冲洗液主动钻杆钻进方法空压机钻进效率正循环;
Abstract: <正> 一、双壁钻具的特点双壁钻具气举反循环钻进工艺用于水文水井钻探是一项重大技术改革。传统的钻进方法由于钻杆内和钻杆外环空间面积相差太大泥浆泵排量小等原因,冲洗液不能达到所要求的上返速度。因而水文水井钻探用正循环钻进,往往不能获得高的钻进效率。另外需要取心或取样时,还必须把全套钻杆从钻孔中提出地面,取出样品后,又要将钻杆再下入孔内方能钻进。若就是用绳索取心方法
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