The Effect of Wellbore Storage and Damage at the Producing Well on Interference Test Analysis
Abstract/Contents
- Abstract
- With new, very sensitive pressure gauges, interference tests can be accomplished in a short period of time. However, at short times, it has been shown that wellbore storage and skin damage can have detrimental effects on the results obtained. Prats and Scott first introduced the problem by showing the effects of wellbore storage on the response of a pulse test. They reported that calculated values of reservoir storage capacity (dhC) would be too high and hydraulic diffusivity (k/dpCt) would be too low if wellbore storage effects were ignored. Jargon found similar results dealing specifically with interference test analysis. He also presented type curves based on finite-difference solutions for analysis of interference data. His attempts to include the skin effect at the producing well and the distance between the production and observation wells as correlating parameters were not completely successful however. Recently Garcia-Rivera and Raghavan presented a method wherein all three parameters--wellbore storage, skin, and the distance between the wells--were considered. New type curves were prepared based on the superposition of constant rate solutions to match the sand-face flow rates caused by wellbore storage. Ramey and Agarwal and Ramey et al. have tabulated the dimensionless sand-face flow rate as a function of time for practical oil field values of storage and skin.The objective of this study is to investigate the wellbore storage and skin problem for pressure interference on a purely analytical basis. Using Laplace transforms in a fashion analogous to the Agarwal et al. solution for the dimensionless wellbore pressure, an analytical solution of the diffusivity equation for the interference pressure including storage and skin effects at the producing well is presented. With the use of numerical inversion of Laplace transforms, tables of the dimensionless interference pressure, PD, as a function of wellbore storage, skin effect, radial distance, and time were prepared and are presented.
Description
| Type of resource | text |
|---|---|
| Date created | June 1977 |
Creators/Contributors
| Author | Williamson, John Wright |
|---|---|
| Primary advisor | Ramey Jr, Henry J. |
| Degree granting institution | Stanford University, Department of Petroleum Engineering |
Subjects
| Subject | School of Earth Energy & Environmental Sciences |
|---|---|
| Genre | Thesis |
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Preferred citation
- Preferred Citation
- Williamson, John Wright. (1977). The Effect of Wellbore Storage and Damage at the Producing Well on Interference Test Analysis. Stanford Digital Repository. Available at: https://purl.stanford.edu/jp963mr4517
Collection
Master's Theses, Doerr School of Sustainability
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