PDC无心钻头结构参数与钻进速度的关系

STRUCTURAL PARAMETERS AND PENETRATION RATE OF PDC NON CORING DRILL BIT

研究ＰＤＣ无心钻头切削齿横向前角、覆盖系数和钻头冠部结构参数与钻进速度的关系，得出横向前角随切削齿所在半径变化的规律为＝－２．３６８２＋０．３９６３ｒ，确定了最优横向前角和覆差系数以及优化冠部结构的参数组合。１７只３种ＰＤＣ无心钻头在现场软－中硬岩层中钻进时，钻头的平均寿命大于４４７．８ｍ，平均钻进速度为３．６９ｍ／ｈ，分别比本次研究前同类钻头提高８０％和８４．５％。

The relations of side rake angle,coverage,structural parameters of bit crown and penetration rate of PDC non coring drill bit are studied and variation of the side rake angle with its radius is found to be β y=-2 3682+0 3963r.And optimal combination of side rake angle,coverage,and crown structural parameters is determined.Three kinds of PDC drill bit are used for drilling in soft to medium hard rocks,the average life of the drill bit is over 447 8m,and the average penetration rate is 3 69m/h,which are 80% and 84 5% greater than those of similar drill bits respectively.