DST (drill Stem test), a fast test for show of oil and gas while drilling.
即中途测试，是指油井在钻井过程中，对有。
AJ type safety joint is a specialized joint consisting of two parts. The specialized joint takes protective effect for drilling stem in drilling, repairing and test oil (gas) engineering, etc.
AJ型安全接头是一种由两件组装起来的专用接头，是钻井、修井、试油(气)等工程中对钻柱起保护作用的一种专用工具。
Drill stem test plays an important role in drilling operation. It is easy to fail or to cause complicated down hole situations if conducted improperly.
中途测试在钻井施工中具有重要的作用，如果测试措施不到位，容易导致测试失败或发生钻井复杂情况。
Drill stem test plays an important role in drilling operation. It is easy to fail or to cause complicated down hole situations if conducted improperly.
中途测试在钻井施工中具有重要的作用，如果测试措施不到位，容易导致测试失败或发生钻井复杂情况。
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