| 摘要 |
A debris collector or strainer assembly for a well string tubular coupling wherein one embodiment discloses a conical coil with one end fixed to a hub, a beveled collar surrounding and supporting the hub and secured thereto with shear pins, the conical coil is deformable as necessary to capture irregular shaped objects between its coils, its loops may be closed, spaced apart, fixed or allowed to expand under pressure, and may be retrieved using an overshot fishing tool to engage a rod extending axially through the coil which may be attached at one or both ends of the coil. |
