| 摘要 |
A formation tester tool includes a formation tester tool body having a surface, a formation probe assembly located within the formation tester tool body, the formation probe assembly including a piston reciprocal between a retracted position and an extended position beyond the surface of the formation tester tool body, the piston being slidingly retained within a chamber, and a seal pad located at an end of the piston, wherein the seal pad includes a first inner sealing element and a second outer sealing element.
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