PRESSURE AND PRESSURE DERIVATIVE ANALYSIS FOR INJECTION TESTS WITH VARIABLE TEMPERATURE WITHOUT TYPE-CURVE MATCHING
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| Natura: | Artículo científico |
| Lingua: | en |
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ECOPETROL S.A.
2008
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| _version_ | 1876435876655923200 |
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| author | Freddy-Humberto Escobar |
| author_facet | Freddy-Humberto Escobar |
| contents | PRESSURE AND PRESSURE DERIVATIVE ANALYSIS FOR INJECTION TESTS WITH VARIABLE TEMPERATURE WITHOUT TYPE-CURVE MATCHING Freddy-Humberto Escobar Javier-Andrés Martínez Matilde Montealegre-M. Ingeniería mobility radial flow Permeability injection front anisothermical flow T he analysis of injection tests under nonisothermic conditions is important for the accurate estimation of the reservoir permeability and the well´s skin factor; since previously an isothermical system was assumed without taking into account a moving temperature front which expands with time plus the consequent changes in both viscosity and mobility between the cold and the hot zone of the reservoir which leads to unreliable estimation of the reservoir and well parameters. To construct the solution an analytical approach presented by Boughrara and Peres (2007) was used. That solution was initially introduced for the calculation of the injection pressure in an isothermic system. It was later modified by Boughrara and Reynolds (2007) to consider a system with variable temperature in vertical wells. In this work, the pressure response was obtained by numerical solution of the anisothermical model using the Gauss Quadrature method to solve the integrals, and assuming that both injection and reservoir temperatures were kept constant during the injection process and the water saturation is uniform throughout the reservoir. For interpretation purposes, a technique based upon the unique features of the pressure and pressure derivative curves were used without employing type-curve matching (TDS technique). The formulation was verified by its application to field and synthetic examples. As expected, increasing reservoir temperature causes a decrement in the mobility ratio, then estimation of reservoir permeability is some less accurate from the second radial flow, especially, as the mobility ratio increases. 2008 artículo científico 0122-5383 https://www.redalyc.org/articulo.oa?id=46530405 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.4 Vol.3 |
| format | Artículo científico |
| id | redalyc_46530405 |
| institution | Redalyc |
| language | en |
| publishDate | 2008 |
| publisher | ECOPETROL S.A. |
| spellingShingle | PRESSURE AND PRESSURE DERIVATIVE ANALYSIS FOR INJECTION TESTS WITH VARIABLE TEMPERATURE WITHOUT TYPE-CURVE MATCHING Freddy-Humberto Escobar Ingeniería mobility radial flow Permeability injection front anisothermical flow PRESSURE AND PRESSURE DERIVATIVE ANALYSIS FOR INJECTION TESTS WITH VARIABLE TEMPERATURE WITHOUT TYPE-CURVE MATCHING Freddy-Humberto Escobar Javier-Andrés Martínez Matilde Montealegre-M. Ingeniería mobility radial flow Permeability injection front anisothermical flow T he analysis of injection tests under nonisothermic conditions is important for the accurate estimation of the reservoir permeability and the well´s skin factor; since previously an isothermical system was assumed without taking into account a moving temperature front which expands with time plus the consequent changes in both viscosity and mobility between the cold and the hot zone of the reservoir which leads to unreliable estimation of the reservoir and well parameters. To construct the solution an analytical approach presented by Boughrara and Peres (2007) was used. That solution was initially introduced for the calculation of the injection pressure in an isothermic system. It was later modified by Boughrara and Reynolds (2007) to consider a system with variable temperature in vertical wells. In this work, the pressure response was obtained by numerical solution of the anisothermical model using the Gauss Quadrature method to solve the integrals, and assuming that both injection and reservoir temperatures were kept constant during the injection process and the water saturation is uniform throughout the reservoir. For interpretation purposes, a technique based upon the unique features of the pressure and pressure derivative curves were used without employing type-curve matching (TDS technique). The formulation was verified by its application to field and synthetic examples. As expected, increasing reservoir temperature causes a decrement in the mobility ratio, then estimation of reservoir permeability is some less accurate from the second radial flow, especially, as the mobility ratio increases. 2008 artículo científico 0122-5383 https://www.redalyc.org/articulo.oa?id=46530405 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.4 Vol.3 |
| title | PRESSURE AND PRESSURE DERIVATIVE ANALYSIS FOR INJECTION TESTS WITH VARIABLE TEMPERATURE WITHOUT TYPE-CURVE MATCHING |
| topic | Ingeniería mobility radial flow Permeability injection front anisothermical flow |
| url | https://www.redalyc.org/articulo.oa?id=46530405 |