| 摘要 |
<p>PCT No. PCT/GB92/01630 Sec. 371 Date Mar. 7, 1994 Sec. 102(e) Date Mar. 7, 1994 PCT Filed Sep. 7, 1992 PCT Pub. No. WO93/05272 PCT Pub. Date Mar. 18, 1993A downhole instrumentation system comprises one or more transducers coupled in a DC current circuit between the star point of an electrical submersible pump and the chassis. A sensing circuit including a DC power supply and an ammeter is arranged to monitor the current drawn. The system includes active electronic components which provide a sequence of signals that may include reference and measuring signals or multiplexed signals from the transducers.</p> |
