Investigation into the Classification of Tight Sandstone Reservoirs via Imbibition Characteristics
Tight sandstone reservoirs are often produced by shutting in the well and inducing imbibition. However, by adopting current reservoir classifications, the heterogeneity of reservoirs cannot be properly treated. Based upon the analysis of the imbibition curves and mercury intrusion porosimetry tests,...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-10-01
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| Series: | Energies |
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| Online Access: | http://www.mdpi.com/1996-1073/11/10/2619 |
| _version_ | 1811184416634961920 |
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| author | Ming Li Hai’en Yang Hongjun Lu Tianjiang Wu Desheng Zhou Yafei Liu |
| author_facet | Ming Li Hai’en Yang Hongjun Lu Tianjiang Wu Desheng Zhou Yafei Liu |
| author_sort | Ming Li |
| collection | DOAJ |
| description | Tight sandstone reservoirs are often produced by shutting in the well and inducing imbibition. However, by adopting current reservoir classifications, the heterogeneity of reservoirs cannot be properly treated. Based upon the analysis of the imbibition curves and mercury intrusion porosimetry tests, Chang-7 tight sandstone reservoirs were classified into three categories according to the newly proposed standards. Imbibition tests demonstrated that for the first category, imbibition and drainage occurred continuously and never reached the plateau within the experiment duration. It was suggested that a longer shut-in time favors the production of oil. For the second category, a steady state for imbibition was reached and a shut-in time as short as three days resulted in a high imbibition rate. For the third category, a plateau was reached for the first time and imbibition restarted until a steady state was reached. The average shut-in time for the third category was eight days. Compatibility between reservoir characteristics and a soaking development regime based upon the proposed classification methods effectively enhances the oil recovery efficiency of formations with distinct petrophysical properties. This provides insight into the classification methods of tight sandstone reservoirs. |
| first_indexed | 2024-04-11T13:11:51Z |
| format | Article |
| id | doaj.art-b9193a0be46742f09ff44a184761bc10 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T13:11:51Z |
| publishDate | 2018-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-b9193a0be46742f09ff44a184761bc102022-12-22T04:22:34ZengMDPI AGEnergies1996-10732018-10-011110261910.3390/en11102619en11102619Investigation into the Classification of Tight Sandstone Reservoirs via Imbibition CharacteristicsMing Li0Hai’en Yang1Hongjun Lu2Tianjiang Wu3Desheng Zhou4Yafei Liu5State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, Sichuan, ChinaOil & Gas Technology Research Institute of Changqing Oilfield Company, PetroChina, Xi’an 710018, Shaanxi, ChinaOil & Gas Technology Research Institute of Changqing Oilfield Company, PetroChina, Xi’an 710018, Shaanxi, ChinaOil & Gas Technology Research Institute of Changqing Oilfield Company, PetroChina, Xi’an 710018, Shaanxi, ChinaCollege of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, Shaanxi, ChinaCollege of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, Shaanxi, ChinaTight sandstone reservoirs are often produced by shutting in the well and inducing imbibition. However, by adopting current reservoir classifications, the heterogeneity of reservoirs cannot be properly treated. Based upon the analysis of the imbibition curves and mercury intrusion porosimetry tests, Chang-7 tight sandstone reservoirs were classified into three categories according to the newly proposed standards. Imbibition tests demonstrated that for the first category, imbibition and drainage occurred continuously and never reached the plateau within the experiment duration. It was suggested that a longer shut-in time favors the production of oil. For the second category, a steady state for imbibition was reached and a shut-in time as short as three days resulted in a high imbibition rate. For the third category, a plateau was reached for the first time and imbibition restarted until a steady state was reached. The average shut-in time for the third category was eight days. Compatibility between reservoir characteristics and a soaking development regime based upon the proposed classification methods effectively enhances the oil recovery efficiency of formations with distinct petrophysical properties. This provides insight into the classification methods of tight sandstone reservoirs.http://www.mdpi.com/1996-1073/11/10/2619tight sandstonereservoir classificationspontaneous imbibition curveshut-in time |
| spellingShingle | Ming Li Hai’en Yang Hongjun Lu Tianjiang Wu Desheng Zhou Yafei Liu Investigation into the Classification of Tight Sandstone Reservoirs via Imbibition Characteristics Energies tight sandstone reservoir classification spontaneous imbibition curve shut-in time |
| title | Investigation into the Classification of Tight Sandstone Reservoirs via Imbibition Characteristics |
| title_full | Investigation into the Classification of Tight Sandstone Reservoirs via Imbibition Characteristics |
| title_fullStr | Investigation into the Classification of Tight Sandstone Reservoirs via Imbibition Characteristics |
| title_full_unstemmed | Investigation into the Classification of Tight Sandstone Reservoirs via Imbibition Characteristics |
| title_short | Investigation into the Classification of Tight Sandstone Reservoirs via Imbibition Characteristics |
| title_sort | investigation into the classification of tight sandstone reservoirs via imbibition characteristics |
| topic | tight sandstone reservoir classification spontaneous imbibition curve shut-in time |
| url | http://www.mdpi.com/1996-1073/11/10/2619 |
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