Abstract
Vertical wells are widely used in the development of thick multi-layer oil reservoirs. The reservoir permeability and perforation location have a great impact on the oil productivity. This study presents the development and application of a new steady-state productivity equation for partially perforated vertical wells in the thick multi-layer oil reservoir, which is of great significance for the reservoir development plan design. Following the hydro-electricity similarity principle and the equivalent percolation resistance law, the entire flow process is divided into planer radial flow and approximate hemispherical flow, which takes into account the reservoir’s multi-layer heterogeneity and vertical wells’ partial perforation. For the approximate hemispherical flow near well bore, the horizontal plate oil layers was transformed to annular layers with different permeability following the principle of constant volume. The flow resistance of each part is calculated respectively, and the steady-state productivity equation of partially perforated vertical well is derived. The new equation’s feasibility is verified by actual well of B oilfield in Iraq, which shows good agreement between the calculated productivity and actual performance. Besides, a type curve template of dimensionless productivity versus perforation ratio is plotted for reservoirs with different permeability ratio. The template shows a nonlinear correlation between the well productivity and perforation ratio, which can be used to establish the perforation principle for vertical wells. To sum up, the application examples reveals that the productivity equation established in this study can reflect the impact of reservoir’s multi-layer heterogeneity and the perforation thickness on well productivity, and the prediction accuracy is acceptable and competitive.
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The study is supported by the National Major Science and Technology Projects of China (Number 2017ZX05032004).
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Li, Cy., Pi, J., Zhang, Y., Qi, Cx., Zhai, Gf. (2021). Steady-State Productivity Equation for Partially Perforated Vertical Wells in Multi-layer Heterogeneous Oil Reservoir. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2020. IFEDC 2020. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-0761-5_190
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DOI: https://doi.org/10.1007/978-981-16-0761-5_190
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