New Advance in Numerical Well Testing Through Streamline Simulation
- Jun Yao (China U. of Petroleum) | Shi-Yi Zheng (Heriot Watt University)
- Document ID
- Society of Petroleum Engineers
- Asia Pacific Oil and Gas Conference & Exhibition, 4-6 August, Jakarta, Indonesia
- Publication Date
- Document Type
- Conference Paper
- 2009. Society of Petroleum Engineers
- 1.7.5 Well Control, 5.1.5 Geologic Modeling, 5.5.7 Streamline Simulation, 5.4.7 Chemical Flooding Methods (e.g., Polymer, Solvent, Nitrogen, Immiscible CO2, Surfactant, Vapex), 2.2.2 Perforating, 5.2.1 Phase Behavior and PVT Measurements, 4.3.4 Scale, 5.4.1 Waterflooding, 1.8 Formation Damage, 5.1.2 Faults and Fracture Characterisation, 5.1.1 Exploration, Development, Structural Geology, 5.5 Reservoir Simulation, 5.3.2 Multiphase Flow, 2.4.3 Sand/Solids Control, 5.6.4 Drillstem/Well Testing, 5.3.1 Flow in Porous Media
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Numerical well testing technique has been regarded as the future of well testing in tackling non-linear, heterogeneous reservoir testing problems. Finite difference and finite element methods were used before in the construction of the well testing model, which was proved worked well for the most practical cases.
In this study, streamline simulation techniques was further developed for numerical well testing purpose, in which production history, reservoir heterogeneity, multi-well interference as well as oil-water two phase flow problems were all considered. Streamline well testing model was developed to analyze pressure draw down and build up under these field conditions.
In the developed well testing mathematical models along each streamline, equations were solved all together numerically to derive transient pressure solutions for draw downs and build ups. Results such as pressure distributions, field saturation maps and the distribution of streamlines can all be produced through the developed simulator and visualized.
It was proved through both theoretical study and a practical field example that the developed streamline well testing algorithm is faster, robust and reliable to use for complicated well test interpretations.
The classic well test interpretation methods based on analytical solutions had become an important tool in the petroleum engineer's toolkit for many years. Unfortunately, analytical solutions are possible only for models of ideal reservoirs, which were limited to the assumption of homogeneous, isotropy formation, infinite boundary, single layer reservoir and the uniform distribution of pressure and saturation. When such assumptions are not valid, then numerical well testing or numerical simulation of well tests was proposed (Zheng et al., 1995). One of the most important characteristics of numerical well test analysis is that the reservoir geological factors (such as, reservoir heterogeneities, pressure dependent properties, and irregular boundary, et al.) and exploitation factors (such as, production history, multiple phase effects, multiple layer, partial penetration, flooding mode and multiwell,rate or pressure well controls, et al.) taken into account can be more comprehensive and complicated, so the well testing interpretation model are more close to the real reservoir model.
|File Size||1 MB||Number of Pages||14|