发明名称 |
Fremgangsmåte og apparat for detektering av jernendringer i rör i et borehull |
摘要 |
<p>A method and apparatus for detecting ferrous changes passing axially through a cylindrical space. In one embodiment, the method comprises surrounding the cylindrical space with a nonmagnetic cylinder having an outer wall and a cylindrical axis; creating an alternating magnetic field in the cylindrical space, the magnetic field created by a rotatable permanent magnet; monitoring the magnetic field with magnetic flux sensors placed outside the outer walls; and detecting changes in the magnetic field as ferrous matter passes axially through the cylindrical space. In other embodiments, the apparatus identifies ferrous changes as the tool joints that connect a jointed tubing string as the tubing string is moved in or out of a well bore, or as the presence or absence of a coiled tubing string in the well bore.</p> |
申请公布号 |
NO20031732(A) |
申请公布日期 |
2003.10.17 |
申请号 |
NO20030001732 |
申请日期 |
2003.04.15 |
申请人 |
THOMAS ENERGY SERVICES INC |
发明人 |
RELTON, MAHENDRAN S;BURLINGTON, JOHN S;MACINNIS, JASON P;FALCON, JONATHAN J |
分类号 |
E21B19/00;E21B47/09;G01N27/90;(IPC1-7):E21B47/09 |
主分类号 |
E21B19/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|