The unallowable wellbore enlargement rate (20%-30%) is the severest problem of wellbore qualities in the job area of north of Hubei.
径扩率超标是鄂北身质存在问题,一般都达到20%~30%,严重影响成质。
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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, 被称为井筒,钻入沉积物层。
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