得出了河南油田五大地质单元不同层段的最佳钻头型号、选择方案和依据。
The best plan of selecting bit is concluded for the differential intervals of five geological units in Henan Oil Field.
实验结果表明，不同的钻头选型将直接影响钻柱振动的强弱，采用合适的钻头型号将减轻井下事故的产生。
The experiment is made which simulates drilled rock by two kind of cone bits. The result shows that different bits cause the vibration …
该方法以一个建成的PD C钻头使用资料库为基础，该数据库包括钻头型号、所钻井段地层的平均剪切强度、单位进尺钻井成本等指标。
It is based on a database of past PDC bits. In the databased, it includes bit type, average shear stress of well which bit was used in, cost per unit length.
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