| 摘要 |
<p>A downhole corrosion monitor comprises a sensor head suspended on a cable, the cable being extensible so as to raise and/or lower the sensor head downhole and having a signal conductor to return data from the sensor head to the surface, the sensor head comprising a plurality of mutually insulated electrical sensors and means for detecting the voltages and/or currents existing therebetween. The electrical sensors can detect corrosion rate by one or both of linear polarisation rate and electrochemical noise and thus there will usually be at least three. The sensor head can further comprise sensors for at least one of temperature, pressure, vibration, acceleration, flow, sand rate and water cut. A corresponding method of obtaining data is also disclosed, together with a method of designing an item of downhole equipment and the item of downhole equipment thus designed.</p> |
