在用声波测试油井油液面深时，反射声波受到大量杂波干扰，给接箍波和液面波的定位带来了极大的困难。

For the abundant of noise in testing oil well depth with sound wave, it is difficult to locate the reflected sound wave.

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仪器发射的声波脉冲在套管接箍和液面位置发生发射。

A sound impulse emitted by the tool at the surface reflects tubular collar reflectors and the liquid surface.

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另一方面使核心混凝土在受荷初期就处于侧向受压的状态，弥补钢管对混凝土紧箍力出现太迟的缺陷。

And the steel tube provides lateral stress at initial period to make up the defect that constraining force comes up too late.

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