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冲击钻进需要的给进压力不大,但是钻进速度很低。回转钻进可以达到很高的钻进速度,可是在坚硬岩石特别是在坚硬砂岩中,即使想达到较高的钻进速度亦需要很大的给进压力。采用冲击回转钻进在较小的给进压力下亦能达到很好的钻进速度;钻进泥质页岩时,当钻进速度超过一定限度,这种钻进方法所需的给进压力较回转钻进要大。所以,冲击回转钻进不适用于这种岩石。图1表示使用这三种方法钻进三种岩石时钻进速度与给进压力的关系曲线,这三种岩石是较软而富有摩擦性的达尔里-吉尔砂岩(英国),最坚硬的石炭纪平南特砂岩和柯尔奴艾尔花岗岩。图1上曲线的一般特性表示钻进速度不大时冲击回转钻进法所需要的给进压力几乎和冲击钻进相同;当钻进速度较大时,所需要的给进压力得大于回转钻进所需的压力。
Impact drilling into the pressure required is not big, but the drilling speed is low. Swing drilling can achieve high drilling speed, but in hard rock, especially in hard sandstone, even if you want to reach a higher drilling speed also need a lot of feed pressure. The use of impact rotary drilling in a small feed pressure can reach a good drilling speed; drilling shaly shale, when the drilling speed exceeds a certain limit, this method of drilling the required feed pressure Larger than rotary drilling. Therefore, Impact Drilling is not suitable for this type of rock. Figure 1 shows the relationship between drilling rate and feed pressure for drilling three types of rock using these three methods: the softer and more abrasive Darri-Jill sandstone (UK), the hardest charcoal Jiping Nante Sandstone and Korunail Granite. The general characteristics of the curve in Fig. 1 indicate that the feed pressure required for the impact rotary drilling method is almost the same as that for the impact drilling when the drilling speed is not large; when the drilling speed is large, the feed pressure required is greater than that for the rotary drill Into the required pressure.