| 摘要 |
A formation tester tool (10) can include a longitudinal probe drill collar (12) having a surface, a formation probe assembly (50) located within the probe drill collar, the formation probe assembly including a piston (96) reciprocal between a retracted position and an extended position beyond the probe drill collar surface, the piston being slidingly retained within a chamber (94), a seal pad (180) located at an end of the piston, the seal pad including an outer surface defining a partial cylindrical surface. The piston includes an outer surface having non-circular cross-sectional shape and the chamber includes an inner surface having a non-circular shape similar to the shape of the piston outer surface. The formation tester tool can include interchangeable draw down assemblies and a flow bore having a curving path. |
