| 摘要 |
<p>A method and apparatus for retrieving magnetic casing fragments from a well using a shrouded magnet are disclosed. Retrieving casing fragments allows the determination of weight loss from the casing to assist in analyzing the integrity of the casing, the condition of the casing and the amount of casing wear, or to determine whether more expensive analysis is required. The shrouded magnet (10) with flow vanes (22), a non-magnetic container (12) enclosing a source of magnetic field, recovers metal fragments by colecting them on the outside surface (13) of the container (12), which fragments are easily separated from the device by removing them from such outer surface after removal of the source of magnetic field from inside the container.</p> |
