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我们在某山区打水井,所钻岩石除地表两米多的冲积层外,其余都是坚硬的花岗岩.钻孔下好孔口管后用直径225毫米钢粒钻头钻进.由于岩石坚硬,钻头直径大,所以孔内阻力很大.使用3ИФ650型钻机,50毫米钻杆,每次提钻扭卸钻杆锁接头丝扣时,用1米多长的扳叉,3～4人才能卸开,可见钻杆受的扭力是很大的.有一钻孔钻进至64米处,因孔内岩粉多,在取心时发生了埋钻事故,曾用吊锤打了1个多小时,但毫无效果.后用千斤顶处理,又把钻杆从上部顶断.不得不决定将钻杆反回,可是扭坏了三个丝锥费了很大的力气一根钻杆都没有反上来.最后利用钻孔口径大的有利条件,又下了一套钻杆,在它的下端锁接头上焊了直径20毫米、长140毫米的三根圆钢,互成120°(如图),下
We hit a well in a mountainous area, except that the rock we drilled was more than two meters thick from the alluvium, and the rest were hard granite. After the hole was drilled, the hole was drilled with a 225 mm diameter steel drill bit. Due to the hard rock, Diameter, so the hole resistance is great.Use 3ISTAФ650 type drilling rig, 50mm drill pipe, each time to pull the drill pipe twist twist drill pipe fittings, with a length of more than 1 meter wrench, 3-4 people can uninstall , We can see that the torsion force of the drill pipe is very big.With a hole drilled to 64 meters, due to more rock powder in the hole, there was a burial accident when coring, once hit by hammer for more than 1 hour, But with no effect.After using the jack treatment, again the drill pipe from the top off. Have decided to reverse the drill pipe, but twisted the three taps spent a lot of effort a drill pipe are not up. Finally, the use of large bore diameter favorable conditions, but also under a set of drill pipe, in its lower end of the welded joints welded diameter 20 mm, length 140 mm of the three round bars, mutual 120 ° (Figure), under