| Popis: |
Passive acoustic listening is relatively simple to implement in downhole equipment and has an interesting potential for downhole measurements. During a flow loop test at high temperature and pressure, SINTEF measured the acoustic noise inside a choke valve and developed an empirical model for prediction of flow rates of gas, oil and water. The accuracy is better than 7% FSO. An accuracy of 5% FSO is achieved for sensorfusion of an acoustic sensor with a differential pressure sensor, a watercut sensor and a differential temperature sensor. SINTEF has developed a filterbank HT ASIC for the downhole signal processing of acoustic data. |
