The unallowable wellbore enlargement rate (20%-30%) is the severest problem of wellbore qualities in the job area of north of Hubei.
井径超标是鄂北工区井身质存在的最问题,一般都20%~30%,重影响成井质。
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It starts out with a long vertical hole, known as a wellbore, drilled down through layers of sediment.
过程始一个深长的直孔洞,即井,透层层沉积物。
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