top hole meaning in English

顶部井眼
顶孔
上部钻孔

Discuss of thrust top hole and shaft conjugation criterion
浅议推力头孔轴配合标准
" don ' t you like the job ? " paul asked . " top hole , " said grimes , " but the hell of a thing happened . tell you late .
"你难道不喜欢那份工作吗？ "保罗问。 "好极了！不过发生了一件糟糕的事。以后告诉你。 "格兰姆斯答道。
Different drilling fluid systems have been used in the horizontal well drilling in north tarim area , more specifically , polymer drilling fluid is used in the top hole of large size , and polysulfide drilling fluid for the lower interval ; for the building section and horizontal interval , polysulfide drilling fluid mixed with oil is used
塔北地区水平井上部大井眼采用聚合物钻井液体系、下部井段采用聚磺钻井液体系、造斜段及水平段采用聚磺混油钻井液体系。