| 摘要 |
<p>Sensors such as transducers for use in the oil and gas industries are protected by a buffer system which has a first chamber (140) open to the environment (eg. well fluid), a second chamber (22) fluidly connected to the first chamber (140) by a first conduit (130); a sensor chamber (26) fluidly connected to the second chamber (22) by a fluid conduit (104) and having a transducer (32); the two conduits and chambers being filled with a viscous liquid and arranged to prevent well fluids reaching the transducer even over an extended period of time. The first conduit (130) can employ capillary repulsion to impede entrance of wellbore fluid, and the second conduit can be an extended curled capillary, entrance to the curled capillary being located proximate the bottom of second chamber (22). <MATH></p> |
