Effects of Large Scale Impermeable or Compressible Regions on Transient Pressure Testing
Abstract/Contents
- Abstract
- Constant pressure and impermeable regions are regarded as reservoir heterogeneities that may be detected by the transient pressure response of a constant rate production well located nearby.A computational algorithm to generated the transient pressure response of the constant rate well is derived by replacing the heterogeneous region by a set of line source wells, and then applying the method of superposition. The algorithm can be extended to include pressure responses of interference wells. The algorithm is validated by matching the pressure responses of simple cases like linear and circular constant pressure and no-flow boundaries, for which there exist analytical solution.A practical consideration of the effects of the shape, size, and orientation of an impermeable reservoir region on transient pressure testing is presented. The constant rate production well is external to the impermeable region. Impermeable regions may be in the form of sealing fractures of finite length, that have little volume associated with them and are only a local restriction to fluid flow. These regions may also be shale lenses or reduced permeability regions that in addition to being a restriction to flow occupy a significant reservoir volume. This work considers a single impermeable region with various sizes, shapes, and orientations with respect to the active source well.The key issue of this work is the detectability of large scale impermeable reservoir regions by transient pressure analysis. The presence of an impermeable region causes the pressure response to deviate from the homogeneous line source response. This pressure deviation is the indication that the reservoir is heterogeneous. Four major parameters affect the pressure response of the active source well in the presence of an impermeable region: 1) the shortest distance between the well and the impermeable region; 2) the size of the region; 3) the shape of the region; and 4) the orientation of the region. This work presents combinations of these four parameters that significantly affect the transient pressure response as well as some criteria for deciding what impermeable regions may be uniquely detected.
Description
| Type of resource | text |
|---|---|
| Date created | March 1987 |
Creators/Contributors
| Author | Britto, Paulo Rubens Ferreira |
|---|---|
| Primary advisor | Sageev, Abraham |
| 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
- Britto, Paulo Rubens Ferreira. (1987). Effects of Large Scale Impermeable or Compressible Regions on Transient Pressure Testing. Stanford Digital Repository. Available at: https://purl.stanford.edu/ff099sb4520
Collection
Master's Theses, Doerr School of Sustainability
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