Tidal Pressure Response and Surveillance of Water Encroachment
- Kare Langaas (Norske Shell A/S) | Knut I. Nilsen (Norwegian Petroleum Directorate) | Svein M. Skjaeveland (U. of Stavanger)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- August 2006
- Document Type
- Journal Paper
- 335 - 344
- 2006. Society of Petroleum Engineers
- 5.5 Reservoir Simulation, 5.7 Reserves Evaluation, 5.8.3 Coal Seam Gas, 5.8.7 Carbonate Reservoir, 5.5.1 Simulator Development, 5.6.4 Drillstem/Well Testing, 2.2.2 Perforating, 5.2.1 Phase Behavior and PVT Measurements, 5.3.4 Integration of geomechanics in models, 5.4.1 Waterflooding, 4.6 Natural Gas, 4.1.4 Gas Processing, 1.2.2 Geomechanics, 5.6.11 Reservoir monitoring with permanent sensors, 3.3 Well & Reservoir Surveillance and Monitoring, 5.1.2 Faults and Fracture Characterisation, 5.2 Reservoir Fluid Dynamics
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A review of the tidal response in petroleum reservoirs is given. Tidal response is caused by periodic changes in overburden stress induced by the ocean tide; the "tidal efficiency factor?? is derived by two different approaches and is in line with a recent well test in the Ormen Lange gas field.
For small geomechanical pertubations like the tidal effect, we show that a simplified coupling of geomechanics and fluid flow is possible. The coupling is easy to implement in a standard reservoir simulator by introducing a porosity varying in phase with the tide. Simulations show very good agreement with the theory.
The observation of the tidal response in petroleum reservoirs is an independent information provider [i.e., it provides information in addition to the (average) pressure and its derivative from a well test]. The implementation of the tidal effect in a normal reservoir simulator gives us the opportunity to study complex multiphase situations and to evaluate the potential of the tidal response as a reservoir-surveillance method. The case studies presented here focus on the possibility of observing water in the near-well region of a gas well.
The main objective of this work is to investigate whether the tidal pressure response in petroleum reservoirs can be used for reservoir surveillance, in particular to detect saturation changes in the near-well region (e.g., to detect water encroachment toward a gas well). The literature seems sparse in this area. Also, our approach of simplified coupling of geomechanics and fluid flow for small geomechanical effects, and the possibility to implement this in a normal reservoir simulator, has not (to our knowledge) been discussed in the literature. Several authors have derived a tidal efficiency factor, but a review and comparison study seems to be missing.
|File Size||2 MB||Number of Pages||10|
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