Well Indices for Non Conventional Wells
Abstract/Contents
- Abstract
- Wells are generally all treated in the same fashion in a numerical simulator: they are modeled with Peaceman's formula. However, when D. W. Peaceman derived his equation, he showed that its use should be limited to special cases, basically corresponding to vertical wells with no interactions with the boundaries or other wells. With nothing easy to use being available, more original wells, like horizontal or slanted wells, are also modeled with this same formula, even though the basic assumptions are violated.A new well model was developed for any well in a parallepipedic reservoir. It is based on an accurate computation of the single phase productivity index. The three dimensional single phase pressure equation is solved in a semi-analytical fashion. Combining the analytical results with the results provided by a numerical simulation of the same case, leads to a more appropriate well index. This well index is then used to provide well transmissibilities to the simulator for each grid-block.The well index can be used to compute the effective well radius. This radius has been computed for different geometries and different times. It appears that the value of the effective well radius can he quite different for some geometries from the basic one used by commercial simulators, particularly when the well is not parallel to any plane of coordinates. Moreover the effective radius varies over time in the transient period, which can be significant for low permeability reservoirs.In the examples studied, the correction for well transmissibilities made only a minor difference.
Description
| Type of resource | text |
|---|---|
| Date created | June 1996 |
Creators/Contributors
| Author | Maizeret, Pierre-David |
|---|---|
| Primary advisor | Aziz, Khalid |
| Degree granting institution | Stanford University, Department of Petroleum Engineering |
Subjects
| Subject | School of Earth Energy & Environmental Sciences |
|---|---|
| Genre | Thesis |
Bibliographic information
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Preferred citation
- Preferred Citation
- Maizeret, Pierre-David. (1996). Well Indices for Non Conventional Wells. Stanford Digital Repository. Available at: https://purl.stanford.edu/jt514ks5365
Collection
Master's Theses, Doerr School of Sustainability
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