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。
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。
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