Guyuan is the oldest city in Ningxia, being established in 114 BC as Gaoping, capital of . It was a stop on the . During the , Guyuan belonged to the territory of Qin state, later Qin Dynasty. The original name of the city began in the Ming dynasty (1452 AD). Because of the importance of its transportation in history, Guyuan was a war gate where Chinese soldiers trained and prepare. [pdf]
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Roller cone insert Volume Indentation depth (WOB) Sliding distance per minute (RPM) .
Figure DP-7: Founder, or rock-cutting dysfunction, causes the depth of cut and ROP to be less than it should be for a given WOB, causing. .
Each of the categories of bit dysfunction will be discussed, as well as the observations that can be made to diagnose .
Bit balling occurs when drilled material accumulates on the cutting structure that begins to carry some of the applied WOB, so that the weight on the cutter tips is reduced. Con- [pdf]
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