A Framework for Modeling Complex Well Configurations

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Complex well configurations and intelligent completions have received much attention lately. One application of this technology is the use of surface adjustable downhole chokes. This allows wells to be split into separate inflow zones where each zone might be produced with different pressure drawdowns, with the production still being commingled. This is achieved by forcing the fluid to pass through downhole chokes before entering the production tubing from the annulus, which is separated into inflow zones by installed packers. The field application of this technology is proven by installations in the North Sea.Despite the large technical and economic risks involved with this technology, little work has been presented on the detailed modeling of these complex well configurations. While it is possible to apply existing finite difference reservoir simulators, the models can be time consuming to build and run and the accuracy of the complex well models may be questionable in some cases. In this project, I have extended the capabilities of fast and simple semi-analytical tools to model these types of complex well configurations. The method provides the single-phase inflow profile accounting for pressure drops in the annulus, tubing and downhole chokes. The effects of reservoir heterogeneity are also approximated. Several example cases are presented to demonstrate the basic capabilities of the methodology. The technique is then applied to a highly heterogeneous fluvial reservoir with a well partially completed in a channel. By using downhole chokes, it is shown that the inflow from the channel can be reduced from 75 to 39 percent of the total, considerably reducing the likelihood of early water or gas breakthrough. Multilateral wells and isolated reservoirs are also used to demonstrate the capabilities of program.


Type of resource text
Date created June 2000


Author Valvatne, Per Henrik
Primary advisor Durlofsky, Louis J.
Degree granting institution Stanford University, Department of Petroleum Engineering


Subject School of Earth Energy & Environmental Sciences
Genre Thesis

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Valvatne, Per Henrik. (2000). A Framework for Modeling Complex Well Configurations. Stanford Digital Repository. Available at: https://purl.stanford.edu/sm095xc9951


Master's Theses, Doerr School of Sustainability

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