新型切削齿及高密度保径布齿提高钻头在硬研磨性地层中的使用寿命。
New type PDC cutters and heavyset gage design promote longer bit life in hard and abrasive formations.
在垂直布齿保径段及冠部曲线不能用方程表示时，均能实现连续的布齿。
This means can realize continuous cutter distribution design at the vertical gauge-protection segment or when we don't know curve's equation.
通过改变喷嘴入口压力、钻头保径宽度、喷嘴直径等影响因素，来研究井底流场的变化。
By changing the nozzle inlet pressure, drill gage width, nozzle diameter factors, to study the changes in these flow fields.
改变喷嘴入口压力、钻头保径宽度、喷嘴直径等影响因素对改变井底漫流层和排屑槽内的速度都有作用；
The overflow tank level and the speed of both the role of Chip can be changed by changing the factors such as the nozzle inlet pressure, drill gage width, nozzle diameter of the PDC bit.
通过试验得出采用方柱状聚晶保径或采用镍钴锰合金胎体，电镀金刚石钻头的保径效果好，钻头寿命可提高3 0 %以上。
Lab and field test show that the service life of electroplated diamond bit of Nickel Cobalt Manganese alloy matrix, whose diameter is protected by polycrystalline diamond, will be improved by 30%.
保温球阀具有良好的保温保冷特性，且阀门的通径与管径一致，同时又能有效降低管路中介质热量损失。
Ball has good thermal insulation cold insulation properties, the valve diameter the diameter line pipe in the same time reduce medium heat loss.
保温球阀具有良好的保温保冷特性，且阀门的通径与管径一致，同时又能有效降低管路中介质热量损失。
UsageBall has good thermal insulation cold insulation properties, and the valve diameter and the diameter line pipe in the same time reduce medium heat loss.
保温球阀具有良好的保温保冷特性，且阀门的通径与管径一致，同时又能有效降低管路中介质热量损失。
Ball has good thermal insulation cold insulation properties, and the valve diameter and the diameter line pipe in the same time reduce medium heat loss.
保温球阀具有良好的保温保冷特性，且阀门的通径与管径一致，同时又能有效降低管路中介质热量损失。
Ball has good thermal insulation cold insulation properties, and the valve diameter and the diameter line pipe in the same time reduce medium heat loss.
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