Pressure and pressure derivative analysis for vertical gas and oil wells in stress sensitive homogeneous and naturally fractured formations without type-curve matching
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| Format: | Artículo científico |
| Sprache: | en |
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ECOPETROL S.A.
2007
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| author | Freddy-Humberto Escobar |
| author_facet | Freddy-Humberto Escobar |
| contents | Pressure and pressure derivative analysis for vertical gas and oil wells in stress sensitive homogeneous and naturally fractured formations without type-curve matching Freddy-Humberto Escobar José-Humberto Cantillo Matilde Montealegre-M. Ingeniería stress pressure reservoir radial flow permeability Currently, rock mechanics plays an important role in the oil industry. Effects of reservoir subsidence,compaction and dilation are being taken into account in modern reservoir management of complexsystems. On the other hand, pressure well tests run in stress sensitive formations ought to be interpretedwith non conventional techniques.During the last three decades, several studies relating transient pressure analysis for characterization of stresssensitive reservoirs have been introduced in the literature. Some of them deal with type curves and/or automatedhistory matching. However, due to the nature of the problem, it does not exist a definitive study focused onthe adequate characterization of reservoirs which permeability changes as fluid withdrawal advances.In this paper, the permeability modulus concept introduced by Pedrosa (1986) is taken as the starting basis.A great number of type curves were generated to study the behavior of the above mentioned formationsunder stress influence. It was found that permeability modulus, therefore permeability changes, can be correlatedwith the slope of the pressure derivative trend during the radial flow regime when the reservoir sufferscompaction. It is also worth to mention that the time at which the minimum characteristic point of a naturallyfractured formation (or the inflection point of a semilog plot) found on the pressure derivative plot is practicallythe same for formations without stress influence. This contributes to the extension of the TDS technique,Tiab (1993), so a new methodology to characterize this kind of reservoirs is proposed here. This was verifiedby the solution of synthetic problems. 2007 artículo científico 0122-5383 https://www.redalyc.org/articulo.oa?id=46530304 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.3 Vol.3 |
| format | Artículo científico |
| id | redalyc_46530304 |
| institution | Redalyc |
| language | en |
| publishDate | 2007 |
| publisher | ECOPETROL S.A. |
| spellingShingle | Pressure and pressure derivative analysis for vertical gas and oil wells in stress sensitive homogeneous and naturally fractured formations without type-curve matching Freddy-Humberto Escobar Ingeniería stress pressure reservoir radial flow permeability Pressure and pressure derivative analysis for vertical gas and oil wells in stress sensitive homogeneous and naturally fractured formations without type-curve matching Freddy-Humberto Escobar José-Humberto Cantillo Matilde Montealegre-M. Ingeniería stress pressure reservoir radial flow permeability Currently, rock mechanics plays an important role in the oil industry. Effects of reservoir subsidence,compaction and dilation are being taken into account in modern reservoir management of complexsystems. On the other hand, pressure well tests run in stress sensitive formations ought to be interpretedwith non conventional techniques.During the last three decades, several studies relating transient pressure analysis for characterization of stresssensitive reservoirs have been introduced in the literature. Some of them deal with type curves and/or automatedhistory matching. However, due to the nature of the problem, it does not exist a definitive study focused onthe adequate characterization of reservoirs which permeability changes as fluid withdrawal advances.In this paper, the permeability modulus concept introduced by Pedrosa (1986) is taken as the starting basis.A great number of type curves were generated to study the behavior of the above mentioned formationsunder stress influence. It was found that permeability modulus, therefore permeability changes, can be correlatedwith the slope of the pressure derivative trend during the radial flow regime when the reservoir sufferscompaction. It is also worth to mention that the time at which the minimum characteristic point of a naturallyfractured formation (or the inflection point of a semilog plot) found on the pressure derivative plot is practicallythe same for formations without stress influence. This contributes to the extension of the TDS technique,Tiab (1993), so a new methodology to characterize this kind of reservoirs is proposed here. This was verifiedby the solution of synthetic problems. 2007 artículo científico 0122-5383 https://www.redalyc.org/articulo.oa?id=46530304 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.3 Vol.3 |
| title | Pressure and pressure derivative analysis for vertical gas and oil wells in stress sensitive homogeneous and naturally fractured formations without type-curve matching |
| topic | Ingeniería stress pressure reservoir radial flow permeability |
| url | https://www.redalyc.org/articulo.oa?id=46530304 |