Accurate Measurements of Liquid-Condensate Rate With Multiphase-Metering Technology Improve Ecological Impact of Well Test in Deepwater Well Offshore Brazil
- Pierre-David Maizeret (Schlumberger) | David Reid (Shell) | Bertrand Theuveny (Schlumberger)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- November 2014
- Document Type
- Journal Paper
- 449 - 456
- 2014.Society of Petroleum Engineers
- 4.1.2 Separation and Treating, 4.4.3 Mutiphase Measurement, 5.6.4 Drillstem/Well Testing, 4.1.5 Processing Equipment, 5.2.1 Phase Behavior and PVT Measurements
- rate measurements, well testing, carry-over prevention, multiphase meter
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- 365 since 2007
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Separators have a proven track record and are widely used in well-testing operations. However, their range of applications is relatively narrow, and they can encounter limitations with fluids for which separation quality is an issue. This paper describes a well test in a deepwater well offshore Brazil. To be able to accommodate different production scenarios, two separators and a multiphase meter were used to measure the flow rates. During the test, a comparison of the flow rates from the multiphase flowmeter and those reported by the separator made possible the identification of some carry-over in the separator at a high choke setting. When the choke size was increased, the separator gas rate increased, whereas the liquid rate dropped at the separator, resulting in a very low condensate/gas ratio (CGR). The multiphase meter, on the other hand, reported a constant CGR, allowing for the real-time diagnostic that carry-over was occurring at the separator. At the end of the test, the same increased choke setting was used for a short period of time to confirm the behavior. The same rate results were observed for each phase, and a small amount of liquid could be seen in the gas flare. The final proof came from the analysis of the downhole samples, which confirmed the CGR measured with the multiphase meter. The consistent results from the multiphase meter make the meter ideal to validate the flow-rate measurements from the reservoir and to improve the burning efficiency. By allowing early identification of imperfect separation, the multiphase meter reduces the health, safety, and environmental (HSE) risks associated with well-test operations.
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