操作注意事项

1.钻探重量 - 钻井重量Thechoice是基于bitmanufacturer的建议，并在孔开罐器切割器的数目来确定。

刀具的2.数字 - 放置在孔开启器由以下事实制约刀具数量写：

1）willfit围绕周边的最大数量。

2）的数量ofcutters越大，越少的重量，这因此降低了渗透速率）

3）在较软地层中，lessweight需要穿透。

4）数量ofcutters越大，平滑工具将运行。

5）数ofcutters越大，成本。

6）越大数目ofcutters，时间越长刀将持续

3.旋转速度 - Maximumspeed是由制造商的建议，并且计算toaccount为切割器每转移动的直线距离确定的

4.清孔 - Afrequently过来看了点扩孔器操作的井眼清洁。 Thevolume屑从孔增加一个平方因子与anincrease的孔直径去除。

Operational Considerations

1. Drilling Weight - Thechoice of drilling weight is determined based on the recommendations of the bitmanufacturer and the number of cutters on the hole opener.

2. Number of Cutters - Thenumber of cutters placed on a hole opener is governed by the following facts:

1) Maximum number which willfit around the perimeter.

2) The greater the number ofcutters, the less the weight, which therefore reduces the penetration rate)

3) In softer formations, lessweight is needed to penetrate.

4) The greater the number ofcutters, the smoother the tool will run.

5) The greater the number ofcutters, the greater the cost.

6) The greater the number ofcutters, the longer the cutters will last

3. Rotary Speed - Maximumspeed is determined by the manufacturer's recommendation and the calculation toaccount for the linear distance the cutter is moving per revolution

4. Hole Cleaning - Afrequently over looked point of hole opener operation is hole cleaning. Thevolume of cuttings to remove from a hole increase by a squared factor with anincrease in hole diameter.