Directional well and horizontal well drilling technology (a)
8 Feb 2010 ... Directional drilling is "a science and technology to make a well hole deviate in the ... set formulas is universal , suitable for a variety of well-shaped holes , the second set is only ... The major methods to measure and calculate bevel .... of the trend, mainly because of PDC drill bit caused by the cutting means.
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bjbaonton's website is bjbaonton.com