常规稳定器在缩径地层起下钻易阻卡，钻进时，泥浆循环阻力大，不利于携岩。

When drilling, it gives big resistance to mud circulation, which is not beneficial to bring up cutting.

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在煤层气钻井中，煤岩坍塌造成接单根困难、起下钻遇阻遇卡、蹩泵等事故和井下复杂。

In coal gas drilling, coal collapse led to drilling hard trip and other accidents.

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在煤层气钻井中，煤岩坍塌造成接单根困难、起下钻遇阻遇卡、蹩泵等事故和井下复杂。

In coal gas drilling, coal collapse led to drilling hard trip and other accidents.

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