The main reason that casing falls to the hole by breaking off thread is casing thread quality can't reach the criteria, and the management of casing running into the hole is not strict.
套管脱扣落井的主要原因是套管扣加工质量达不到规范要求，以及套管入井管理不严造成的。
The main reason that casing falls to the hole by breaking off thread is casing thread quality can't reach the criteria, and the management of casing running into the hole is not strict.
套管脱扣落井的主要原因是套管扣加工质量达不到规范要求，以及套管入井管理不严造成的。
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