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The unallowable wellbore enlargement rate (20%-30%) is the severest problem of wellbore qualities in the job area of north of Hubei.

井径扩大率超北工区井身质存在的最大问,都达到20%~30%,严重影响成井质

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institutional, institutionalise, institutionalism, institutionalize, institutionary, institution-based-rehabilitation, institutions of higher learning, institutor, INSTMC, instoscope,

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3G, 401(K), a,

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TED-Ed(视版)

It starts out with a long vertical hole known as a wellbore drilled down through layers of sediment.

它从一个长长的垂直孔始, 该孔被称为井筒,钻入沉

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instructive, instructively, instructor, instructorship, instructress, instrument, instrument panel, instrumental, instrumental conditioning, instrumental music,

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3G, 401(K), a,
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