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鋼砂鑽进的投砂方法是直接影响鑽进效率的一个因素,目前一般对一次投砂和結合投砂法都有所了解,而对連續投砂法却不很感兴趣,而觉得其操作麻煩,技术水平高,且效率低。但我队1号鑽机曾长时期使用連續投砂法,事实証明鑽进硬岩石比一次及結合投砂法效率高。前将三种投砂方法作一比較: 1.採用一次投砂法,最初鋼砂多,孔区有大量多余的钢砂分布在鑽头与孔壁间,增加鑽头的阻力,
The sand casting method is a factor that directly affects the drilling efficiency. Currently, sand casting and sand mixing methods are generally known. However, continuous sand casting methods are not very interesting and they are considered to be Trouble, high technical level, and low efficiency. However, our team’s No. 1 rig used a continuous sand casting method for a long period of time. It has been proved that the drilling of hard rock is more efficient than a combined sand casting method. Before the sand casting method to make a comparison: 1. Using a sand casting method, the initial steel sand, a large number of excess steel sand in the hole area distributed between the drill bit and the hole wall, increase the resistance of the drill bit,