The result shows that the main reasons are high bottom hole temperature, corrosion of drilling tool during storage and drilling process, high value of formation drillability, and multi-fault.
结果表明，井底温度高、钻具存放及钻井过程中的腐蚀和地层可钻性级值高且断层多，是该地区钻具失效的主要原因。
In this paper, pressure profile adjustment technique for multi-layer and multiple pressure system reservoir in adjustment well drilling block during the process of drilling is studied.
本文针对调整井钻井区块多层系多压力系统储层在钻井施工过程中压力剖面调整技术展开研究。
The multi-process no-circulation foundation drilling techniques is highly adaptable to various formations, and drills faster than the conventional methods by 2 to 4 times.
多工艺旋挖钻进技术工艺适应地层能力强，比传统的钻进工艺方法可以提高钻进速度24倍以上。
The multi-process no-circulation foundation drilling techniques is highly adaptable to various formations, and drills faster than the conventional methods by 2 to 4 times.
多工艺旋挖钻进技术工艺适应地层能力强，比传统的钻进工艺方法可以提高钻进速度24倍以上。
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