论文部分内容阅读
在废石堆或砂卵石坡积层(尤其是厚达几十米)中施工钻孔,会比正常地层的钻孔施工困难得多。常见的弊端有:①孔底全漏失,冲洗液只能冷却钻头,而粗径钻具处于干摩擦状态;②井壁掉块坍塌,致使提起的钻具下不到孔底;③孔径不规则,难下套管,即使下入套管也易脱扣与折断。通过实践,对此可用双液钻进,解决上述问题。即从钻杆中正常送入清水(A液)至孔底冷却钻头。同
Drilling holes in a pile of rubble or sand and pebble slopes, especially thicknesses of tens of meters, can be a lot harder to drill than a normal formation. Common drawbacks are: ① hole at the end of the leak, the rinse liquid can only cool the drill, and the diameter of the drill in a dry friction state; ② borehole collapse collapse, resulting in less than the hole under the lifting of the drill; ③ irregular aperture , Difficult to casing, even under the casing is also easy to trip and break. Through practice, this can be double-liquid drilling to solve the above problems. From the drill pipe into the normal water (A liquid) to the bottom of the hole cooling drill. with