Criteria for Determining Times for End of Transient Flow and Start of Pseudosteady State Flow
Abstract/Contents
- Abstract
- This report describes criteria for determining the time of transition in well pressure behavior, i.e., the end of transient flow and start of pseudosteady state flow. Transition times were determined for the pressure at a well in various locations within either a closed or a constant pressure drainage area. The corresponding transition times were also determined firm pressure derivative behavior. The basic criteria for transition are that pressure or pressure derivative deviate from the behavior of fully developed transient flow, or pseudosteady state flow. This can be deduced to finding linear relationships of pressure or pressure derivative with time, or with the logarithm of time. Deviation from the linear relationships can be determined by graphical analysis, or by calculation using the appropriate analytic solutions. In order to determine dimensionless transition times for various well locations and drainage shapes, well pressure behavior was calculated using superposition of line source solutions to generate the appropriate boundaries. Pressure derivatives were developed by a similar superposition of the derivative of the continuous line source solutions. The derivative of the line source was also used to develop the derivative of pressure buildup behavior for various well locations in rectangular drainage shapes.
Description
| Type of resource | text |
|---|---|
| Date created | August 1987 |
Creators/Contributors
| Author | Aarstad, Knut |
|---|---|
| Primary advisor | Ramey, Jr., Henry J. |
| Degree granting institution | Stanford University, Department of Petroleum Engineering |
Subjects
| Subject | School of Earth Energy & Environmental Sciences |
|---|---|
| Subject | Stanford Geothermal Program |
| Genre | Thesis |
Bibliographic information
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Preferred citation
- Preferred Citation
- Aarstad, Knut. (1987). Criteria for Determining Times for End of Transient Flow and Start of Pseudosteady State Flow. Stanford Digital Repository. Available at: https://purl.stanford.edu/fh867bd2918
Collection
Master's Theses, Doerr School of Sustainability
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