Determination of vertical and horizontal permeabilities for vertical oil and gas wells with partial completion and partial penetration using pressure and pressure derivative plots without type-curve matching
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| Formato: | Artículo científico |
| Lenguaje: | en |
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ECOPETROL S.A.
2005
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| _version_ | 1876427292723380224 |
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| author | Katherine Moncada |
| author_facet | Katherine Moncada |
| contents | Determination of vertical and horizontal permeabilities for vertical oil and gas wells with partial completion and partial penetration using pressure and pressure derivative plots without type-curve matching Katherine Moncada Djebbar Tiab Renzon Zamora Sandra-L. Nese Abel Chacon Freddy-Humberto Escobar Matilde Montealegre Ingeniería radial flow skin factor spherical flow hemispherical flow analytical solution It has been long recognized that in some reservoirs the flow does not follow the expected radial cylindricalpattern. Spherical flow may take place in systems with wells completed in thick reservoirs where a shortcompletion interval is open to flow yielding a unique and more complex early-time pressure behavior. Someof the main reasons for partial penetration are to avoid coning of water and minimize sand production. A similarearly-time pressure behavior may be due to the presence of plugged perforations. Such well completions arereferred to as limited-entry, restricted-entry or partially penetrating wells. A typical case of spherical propagationof pressure transients occurs during the repeat formation tester measurements. Such a test measures spot formationpressures and recovers formation fluid samples for gaining an insight into the reservoir flow mechanics.The purpose of this study is to identify on the pressure and pressure derivative curves the unique characteristicsfor different flow regimes resulting from these type of completions and to determine various reservoir parameters,such as vertical, horizontal permeability, and various skin factors. The interpretation is performed using TiabsDirect Synthesis (TDS) Technique, introduced by Tiab (1993), which uses analytical equations obtained fromcharacteristic lines and points found on the log-log plot of pressure and pressure derivative to determine permeability,skin and wellbore storage without using type-curve matching. The extension of this methodology for thecase under study includes wellbore storage and skin effects. It is applied to both drawdown and buildup tests.We found that a spherical or hemispherical flow regime occurs prior to the radial flow regime whenever thepenetration ratio of about 20%. A half-slope line on the pressure derivative is the unique characteristic identifyingthe presence of the spherical/hemispherical flow. The typical half-slope line of theses flow regimes isused to estimate spherical permeability and spherical skin values. These parameters are then used to estimatevertical permeability, anisotropy index and skin. Results of TDS technique where successufully compared to those of conventional technique for field and simulated examples. 2005 artículo científico 0122-5383 https://www.redalyc.org/articulo.oa?id=46530106 en http://www.redalyc.org/revista.oa?id=465 CT&F Ciencia, Tecnología y Futuro application/pdf ECOPETROL S.A. CT&F Ciencia, Tecnología y Futuro (Colombia) Num.1 Vol.3 |
| format | Artículo científico |
| id | redalyc_46530106 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | ECOPETROL S.A. |
| spellingShingle | Determination of vertical and horizontal permeabilities for vertical oil and gas wells with partial completion and partial penetration using pressure and pressure derivative plots without type-curve matching Katherine Moncada Ingeniería radial flow skin factor spherical flow hemispherical flow analytical solution Determination of vertical and horizontal permeabilities for vertical oil and gas wells with partial completion and partial penetration using pressure and pressure derivative plots without type-curve matching Katherine Moncada Djebbar Tiab Renzon Zamora Sandra-L. Nese Abel Chacon Freddy-Humberto Escobar Matilde Montealegre Ingeniería radial flow skin factor spherical flow hemispherical flow analytical solution It has been long recognized that in some reservoirs the flow does not follow the expected radial cylindricalpattern. Spherical flow may take place in systems with wells completed in thick reservoirs where a shortcompletion interval is open to flow yielding a unique and more complex early-time pressure behavior. Someof the main reasons for partial penetration are to avoid coning of water and minimize sand production. A similarearly-time pressure behavior may be due to the presence of plugged perforations. Such well completions arereferred to as limited-entry, restricted-entry or partially penetrating wells. A typical case of spherical propagationof pressure transients occurs during the repeat formation tester measurements. Such a test measures spot formationpressures and recovers formation fluid samples for gaining an insight into the reservoir flow mechanics.The purpose of this study is to identify on the pressure and pressure derivative curves the unique characteristicsfor different flow regimes resulting from these type of completions and to determine various reservoir parameters,such as vertical, horizontal permeability, and various skin factors. The interpretation is performed using TiabsDirect Synthesis (TDS) Technique, introduced by Tiab (1993), which uses analytical equations obtained fromcharacteristic lines and points found on the log-log plot of pressure and pressure derivative to determine permeability,skin and wellbore storage without using type-curve matching. The extension of this methodology for thecase under study includes wellbore storage and skin effects. It is applied to both drawdown and buildup tests.We found that a spherical or hemispherical flow regime occurs prior to the radial flow regime whenever thepenetration ratio of about 20%. A half-slope line on the pressure derivative is the unique characteristic identifyingthe presence of the spherical/hemispherical flow. The typical half-slope line of theses flow regimes isused to estimate spherical permeability and spherical skin values. These parameters are then used to estimatevertical permeability, anisotropy index and skin. Results of TDS technique where successufully compared to those of conventional technique for field and simulated examples. 2005 artículo científico 0122-5383 https://www.redalyc.org/articulo.oa?id=46530106 en http://www.redalyc.org/revista.oa?id=465 CT&F Ciencia, Tecnología y Futuro application/pdf ECOPETROL S.A. CT&F Ciencia, Tecnología y Futuro (Colombia) Num.1 Vol.3 |
| title | Determination of vertical and horizontal permeabilities for vertical oil and gas wells with partial completion and partial penetration using pressure and pressure derivative plots without type-curve matching |
| topic | Ingeniería radial flow skin factor spherical flow hemispherical flow analytical solution |
| url | https://www.redalyc.org/articulo.oa?id=46530106 |