Effect of the pseudotime function on gas reservoir drainage area determination
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| Natura: | Artículo científico |
| Lingua: | en |
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ECOPETROL S.A.
2007
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| _version_ | 1876487471301132288 |
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| author | José-Humberto Cantillo |
| author_facet | José-Humberto Cantillo |
| contents | Effect of the pseudotime function on gas reservoir drainage area determination José-Humberto Cantillo Aura-María López Freddy-Humberto Escobar Ingeniería pressure radial flow steady state permeability reservoir gas the gas flow equation is normally linearized to allow the liquid solution of the diffusivity equationto satisfy gas behavior when analyzing transient test data of gas reservoirs. When wellbore storageconditions are insignificant, drawdown tests are best analyzed using the pseudopressure function. Onthe other hand, buildup pressure tests require linearization of both pseudotime and pseudopressure. It is notthe case for the TDS technique which is indifferently applied to either drawdown or buildup tests. However,whichever the case, pseudotime has certain effect at very long testing times in formations of moderate tohigh permeability.In this paper, we implemented the Tiabs Direct Synthesis (TDS) technique, to include pseudotime effects, andobserve its influence on the interpretation results of gas well test data at early and late time periods. Newanalytical equations to estimate reservoir permeability, wellbore storage coefficient, pseudoskin factor andreservoir drainage area are presented. Then, a comparison of results against rigorous time was carried outfor simulated and field cases. We found acceptable results for permeability, pseudoskin factor and wellborestorage coefficient. However, for the case of reservoir drainage area, the deviation error was of 4,1% for asimulated case and 17,9% for a field case. However, the smaller of these deviations may be small if relatedto pressure transient analysis results. However, this deviation in a gas reservoir with reserves of one terastandard cubic feet is equivalent to a huge difference of 38 gigas of standard cubic feet of gas which mayhave an economic impact to any oil company. 2007 artículo científico 0122-5383 https://www.redalyc.org/articulo.oa?id=46530307 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_46530307 |
| institution | Redalyc |
| language | en |
| publishDate | 2007 |
| publisher | ECOPETROL S.A. |
| spellingShingle | Effect of the pseudotime function on gas reservoir drainage area determination José-Humberto Cantillo Ingeniería pressure radial flow steady state permeability reservoir gas Effect of the pseudotime function on gas reservoir drainage area determination José-Humberto Cantillo Aura-María López Freddy-Humberto Escobar Ingeniería pressure radial flow steady state permeability reservoir gas the gas flow equation is normally linearized to allow the liquid solution of the diffusivity equationto satisfy gas behavior when analyzing transient test data of gas reservoirs. When wellbore storageconditions are insignificant, drawdown tests are best analyzed using the pseudopressure function. Onthe other hand, buildup pressure tests require linearization of both pseudotime and pseudopressure. It is notthe case for the TDS technique which is indifferently applied to either drawdown or buildup tests. However,whichever the case, pseudotime has certain effect at very long testing times in formations of moderate tohigh permeability.In this paper, we implemented the Tiabs Direct Synthesis (TDS) technique, to include pseudotime effects, andobserve its influence on the interpretation results of gas well test data at early and late time periods. Newanalytical equations to estimate reservoir permeability, wellbore storage coefficient, pseudoskin factor andreservoir drainage area are presented. Then, a comparison of results against rigorous time was carried outfor simulated and field cases. We found acceptable results for permeability, pseudoskin factor and wellborestorage coefficient. However, for the case of reservoir drainage area, the deviation error was of 4,1% for asimulated case and 17,9% for a field case. However, the smaller of these deviations may be small if relatedto pressure transient analysis results. However, this deviation in a gas reservoir with reserves of one terastandard cubic feet is equivalent to a huge difference of 38 gigas of standard cubic feet of gas which mayhave an economic impact to any oil company. 2007 artículo científico 0122-5383 https://www.redalyc.org/articulo.oa?id=46530307 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 | Effect of the pseudotime function on gas reservoir drainage area determination |
| topic | Ingeniería pressure radial flow steady state permeability reservoir gas |
| url | https://www.redalyc.org/articulo.oa?id=46530307 |