·2,447,543篇论文数据，部分数据来源于NoteExpress
A section of heavy walled tubing that is placed across any perforated interval through which the production tubing must pass, such as may be required in multiple zone completions.
置于任一射孔层段的一段厚壁油管，这时生产油管必须通过此射孔层段，如在多层完井中所要求的。
youdao
应用推荐
模块上移
模块下移
不移动