| 摘要 |
Device for collecting particulate matter and debris in horizontal or highly-deviated oil or gas wells, comprising a cylindrical housing (10) enclosing a collecting chamber having at least one radial port (7A, B) at a distance from an inner end (5) of said chamber (1), and a piston-like sleeve (3) normally and in a starting position closing said port(s). Releasable means (9) retain said sleeve (3) in said starting position and a spring (8) urges said sleeve (3) towards said starting position. The sleeve (3) has a central axial opening (3D) as well as a differential area (3C) exposed to the pressure outside said chamber (1) in said normal or starting position, whereby upon releasing of said releasable means (9) said outside pressure will move said sleeve (3) towards said inner end (5) of the chamber (1) and open said port(s) (7A, B) so as to collect a quantity of said matter and debris in the chamber. |
