| 摘要 |
<p>Sensing apparatus for monitoring fluid intake and discharge pressure in an oil well comprises an intake pressure transducer (34) mounted at the bottom of an ESP pump string (36) and arranged to sense intake pressure directly and a similarly mounted discharge pressure transducer (38). A capillary tube (28) is connected at its lower end to the transducer (38) and indirectly at its upper end to a fluid reservoir (49) located in the area of discharge pressure. Valve means (48) in the form of alternative nipples are arranged to apply intake or discharge pressure to fluid reservoir (49) through a port in the wall of the by-pass string. While discharge pressure is normally monitored via the capillary tube (28), the intake pressure can be monitored in the event of breakdown of the transducer (38), thus providing redundancy to the system; also the ability to sense intake pressure at two different points enables the system to be calibrated.</p> |
