发明名称 |
MEASURING THICKNESS OF FERROMAGNETIC CASTINGS |
摘要 |
<p>An electromagnetic thickness tool is disclosed to produce a measurement of the wall-thickness of a ferromagnetic casing corrected for the effects of casing permeability. First apparatus provides an uncorrected thickness signal proportional to the thickness of the casing uncorrected for the effects of casing permeability. A second apparatus provides a permeability signal representative of the permeability of the casing. A signal processor uses the mathematical square root of the permeability signal as a correction factor for the uncorrected thickness signal for generating the corrected value. The second apparatus, responsive to a signal proportional to the magnitude of the inside diameter of the casing, corrects the permeability signal for the effects of casing inside diameter.</p> |
申请公布号 |
AU525213(B2) |
申请公布日期 |
1982.10.28 |
申请号 |
AU19790053504 |
申请日期 |
1979.12.05 |
申请人 |
SCHLUMBERGER OVERSEAS, S.A. |
发明人 |
GLENN S. SMITH |
分类号 |
E21B47/08;(IPC1-7):21B49/00;01B7/10 |
主分类号 |
E21B47/08 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|