Deepwater-Reservoir Characterization by Use of Tidal Signal Extracted From Permanent Downhole Pressure Gauge
- Xingru Wu (University of Oklahoma) | Kegang Ling (University of North Dakota) | Dexin Liu (China University of Petroleum)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- August 2013
- Document Type
- Journal Paper
- 390 - 400
- 2013. Society of Petroleum Engineers
- 5.6.11 Reservoir monitoring with permanent sensors, 5.1 Reservoir Characterisation, 4.3.4 Scale
- 2 in the last 30 days
- 547 since 2007
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Permanent-downhole-gauge (DHG) technology has been used widely indeepwater-reservoir development in the last decade and is playing anincreasingly significant role in real-time reservoir/well surveillance andmanagement. Tidal signals extracted from this highly accurate and precisedevice can be used for reservoir characterization such as monitoring thechanges of saturations and estimating rock/pore compressibility. Most previousworks have treated tidal signals as pressure "noise," and little has beendiscussed on how to use tidal information in reservoir characterization. Thispaper will address how to use the fast Fourier transform (FFT) to extract tidalsignals and the theories and methods for processing the signal to achievereservoir characterization. In addition, a couple of examples from a deepwaterfield will be discussed to illustrate how to use tidal information to estimatepore compressibility, monitor dynamic fluid-saturation change, and detect thepresence of a secondary gas cap. This paper will show that FFT is a fast andreliable method for processing the DHG pressure data for tidal signals that canbe used for reservoir characterization in multiple dimensions. Furthermore, theresults (pore compressibility and saturation) obtained from the tidal signalsare unique because they cannot be obtained in the laboratory, by simulation, orby direct measurement because of the scale affected by tides.
|File Size||1 MB||Number of Pages||11|
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