CENTRALISER FOR WELL CASING:CENTRALISER HAS WHEELS WHICH CONTACT WALL OF CASING

申请公布号：NZ208112(A)

申请号：NZ19840208112

申请日期：1984.05.09

申请公布日期：1987.02.20

申请人：

SCHLUMBERGER TECHNOLOGY BV.

发明人：VANNIER, D.F.

分类号：E21B23/06;E21B17/10;(IPC1-7):E21B17/10

主分类号：E21B23/06

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