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初级定向钻孔孔身剖面形状多为J 型,主要用地层促斜规律进行人工控斜,辅以人工定向造斜,达到施工目的。此外,还有直线型斜孔,S 型、多分枝定向和水平井等。这类钻孔地质(工程)设计要求中靶精度高,有的钻孔轴线在空间位置的变化受到约束,必须以人工定向造斜为主,同时利用地层促斜规律进行人工控斜,并需采取相应的钻进工艺等综合措施,才能达到施工目的。因此钻孔孔身剖面的设计要经过选型和精确计算,采用专门的造斜机具、定向测斜仪、控斜钻具及其独特的钻进方法。目前,我国在设计施工水平井、全方位多分枝孔、丛式S 形定向注浆孔等方面已垮入国际先进行列。~*
The shape of the primary directional drill hole is mostly J-shaped. The slope is mainly controlled by artificial striations, supplemented by artificial directional sloping, to achieve the purpose of construction. In addition, there are linear inclined holes, S-type, multi-branch orientation, and horizontal wells. The drilling geology (engineering) design requires high accuracy in the target, and some borehole axes are constrained to change in the spatial position. Artificial directional skeletal divergence must be used as the main method. At the same time, the slope-promoting law should be used to manually control the slope. Take comprehensive measures such as the drilling process to achieve the purpose of construction. Therefore, the design of the drill hole profile should be selected and accurately calculated, using a special build-up machine, directional inclinometer, inclined-controlled drilling tool and its unique drilling method. At present, China has entered the international advanced ranks in the design and construction of horizontal wells, all-round multi-branched holes, cluster S-shaped directional grouting holes, and so on. ~*