The bit type selection is very important to increase drilling speed and reduce costs of drilling in the course of drilling.
钻井过程中钻头类型的选择对于提高钻井速度、降低钻井成本非常重要。
Problems and countermeasures of wireline coring drilling in "walk" formation in a uranium mine in Guangxi are introduced with type selection test for diamond drilling bit.
通过绳索取心钻进金刚石钻头选型试验，介绍了广西资源县向阳坪铀矿区“打滑”地层中绳索取心钻进存在的问题及采取的技术措施。
It is proved that using this method can avoid the lack of calculating rock drillability using single method and it can provide better reference for bit type selection a...
这样求出的可钻性级值将为钻头选型和地层分层提供更好的参考。
Drillable analysis of the rocks should be strengthened and bit type selection should be well done.
加强岩石可钻性分析，做好钻头选型工作。
The deep formation has a high degree of hardness and abrasivity; the bit type selection is difficult and the ROP is low especially under the high density mud.
深部井段地层的硬度高、研磨性强，钻头选型困难，特别是在高密度条件下机械钻速低。
The deep formation has a high degree of hardness and abrasivity; the bit type selection is difficult and the ROP is low especially under the high density mud.
深部井段地层的硬度高、研磨性强，钻头选型困难，特别是在高密度条件下机械钻速低。
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