盘形钻头牙齿刮切实验研究

EXPERIMENTS ON DISC BIT FOR SCRAPING-CUBING EFFEm OF ITS TEETH

为了弄清盘形钻头的破岩机理，了解不同结构参数盘形切削刃在破岩时的效果，特别是用盘形钻头钻中硬地层、软地层的钻井效果，对盘形牙轮钻头的９种不同结构参数（几何角度）的盘形切削齿与目前镶齿牙轮钻头上使用的瓢形和楔形齿在砂岩上进行了利切对比实验，并测量了不同牙齿在刮切过程中的刮切力和体积，对每颗牙齿在岩石上刮切下来的岩石体积采用填石蜡的方法进行测量。在实验过程中，通过计算机和数据采集器将整个实验数据完整地记录下来，并对所有实验数据进行统计分析，得到了不同结构牙齿在刮切重庆砂岩时的刮切效果，为设计出能实用于中软、软地层钻井用的盘形钻头提供了理论依据和实验数据。

In this paper, a comparison scraping test between the disc teeth of disc bits(with different structural parameters, degrees of angle)and the teeth of insert rock bits is introduced. The scraping force and volumeof each kind of teeth are measured and recorded by computer and data acquisition device. Afterwards statisticalanalysis conducted shows the different scraping effects of each kind of teeth, which can be used as theoretical basis and supply experimental data for future disc bit design,