Developing features of the near-bottomhole zones in productive formations at fields with high gas saturation of formation oil
The article studies the formation features of the bottomhole zones in productive formations during operation of production wells in the north of the Perm Territory. Their distinctive feature is the high gas saturation of formation oil. The most widely used parameter in Russian and world practice – t...
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| Format: | Article |
| Language: | English |
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Saint-Petersburg Mining University
2021-09-01
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| Series: | Записки Горного института |
| Subjects: | |
| Online Access: | https://pmi.spmi.ru/index.php/pmi/article/view/13965?setLocale=en_US |
| _version_ | 1797947248375496704 |
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| author | Vladislav I. Galkin Dmitry A. Martyushev Inna N. Ponomareva Irina A. Chernykh |
| author_facet | Vladislav I. Galkin Dmitry A. Martyushev Inna N. Ponomareva Irina A. Chernykh |
| author_sort | Vladislav I. Galkin |
| collection | DOAJ |
| description | The article studies the formation features of the bottomhole zones in productive formations during operation of production wells in the north of the Perm Territory. Their distinctive feature is the high gas saturation of formation oil. The most widely used parameter in Russian and world practice – the skin factor was used as a criterion characterizing the state of the bottomhole zone. Analysis of scientific publications has shown that one of the main problems of applying the skin factor to assess the state of bottomhole zones is the ambiguity of interpretations of its physical meaning and the impossibility of identifying the prevailing factors that form its value. The paper proposes an approach to identifying such factors in the conditions of the fields under consideration, based on multivariate correlation-regression analysis. Choice of this tool is due to the complexity of the processes occurring in the “formation – bottomhole zone – well” system. When describing complex multifactorial processes, the chosen method demonstrates a high degree of reliability. For a large number of wells in the region, significant material was collected and summarized, including the results of determining the skin factor (1102 values) during hydrodynamic investigations, as well as data on the values of various geological and technological indicators, which can probably be statistically related to the value of the skin factor. A series of multidimensional mathematical models has been built; the skin factor was used as a predicted parameter, and data on the values of geological and technological indicators were used as independent indicators. Analysis of the constructed models is a key stage of this study. Set of parameters included in the multidimensional models, sequence of their inclusion and contribution to the total value of the achieved determination coefficient as the main indicator for the performance of the constructed models were studied. It has been established that the main factor influencing the state of the bottomhole zone is oil degassing. Significant differences in the formation features of the skin factor in the terrigenous and carbonate sediments at the fields under consideration have been determined. |
| first_indexed | 2024-04-10T21:23:44Z |
| format | Article |
| id | doaj.art-355dced27b8d44f499966669cdcf72c5 |
| institution | Directory Open Access Journal |
| issn | 2411-3336 2541-9404 |
| language | English |
| last_indexed | 2024-04-10T21:23:44Z |
| publishDate | 2021-09-01 |
| publisher | Saint-Petersburg Mining University |
| record_format | Article |
| series | Записки Горного института |
| spelling | doaj.art-355dced27b8d44f499966669cdcf72c52023-01-20T02:04:53ZengSaint-Petersburg Mining UniversityЗаписки Горного института2411-33362541-94042021-09-0124938639210.31897/PMI.2021.3.713965Developing features of the near-bottomhole zones in productive formations at fields with high gas saturation of formation oilVladislav I. Galkin0https://orcid.org/0000-0003-4867-2298Dmitry A. Martyushev1https://orcid.org/0000-0002-5745-4375Inna N. Ponomareva2https://orcid.org/0000-0003-0546-2506Irina A. Chernykh3https://orcid.org/0000-0001-8343-4805Perm National Research Polytechnic UniversityPerm National Research Polytechnic UniversityPerm National Research Polytechnic UniversityPerm National Research Polytechnic UniversityThe article studies the formation features of the bottomhole zones in productive formations during operation of production wells in the north of the Perm Territory. Their distinctive feature is the high gas saturation of formation oil. The most widely used parameter in Russian and world practice – the skin factor was used as a criterion characterizing the state of the bottomhole zone. Analysis of scientific publications has shown that one of the main problems of applying the skin factor to assess the state of bottomhole zones is the ambiguity of interpretations of its physical meaning and the impossibility of identifying the prevailing factors that form its value. The paper proposes an approach to identifying such factors in the conditions of the fields under consideration, based on multivariate correlation-regression analysis. Choice of this tool is due to the complexity of the processes occurring in the “formation – bottomhole zone – well” system. When describing complex multifactorial processes, the chosen method demonstrates a high degree of reliability. For a large number of wells in the region, significant material was collected and summarized, including the results of determining the skin factor (1102 values) during hydrodynamic investigations, as well as data on the values of various geological and technological indicators, which can probably be statistically related to the value of the skin factor. A series of multidimensional mathematical models has been built; the skin factor was used as a predicted parameter, and data on the values of geological and technological indicators were used as independent indicators. Analysis of the constructed models is a key stage of this study. Set of parameters included in the multidimensional models, sequence of their inclusion and contribution to the total value of the achieved determination coefficient as the main indicator for the performance of the constructed models were studied. It has been established that the main factor influencing the state of the bottomhole zone is oil degassing. Significant differences in the formation features of the skin factor in the terrigenous and carbonate sediments at the fields under consideration have been determined.https://pmi.spmi.ru/index.php/pmi/article/view/13965?setLocale=en_USskin factorhydrodynamic investigations of wellsmultidimensional mathematical modelgas oil rationear-bottomhole zone |
| spellingShingle | Vladislav I. Galkin Dmitry A. Martyushev Inna N. Ponomareva Irina A. Chernykh Developing features of the near-bottomhole zones in productive formations at fields with high gas saturation of formation oil Записки Горного института skin factor hydrodynamic investigations of wells multidimensional mathematical model gas oil ratio near-bottomhole zone |
| title | Developing features of the near-bottomhole zones in productive formations at fields with high gas saturation of formation oil |
| title_full | Developing features of the near-bottomhole zones in productive formations at fields with high gas saturation of formation oil |
| title_fullStr | Developing features of the near-bottomhole zones in productive formations at fields with high gas saturation of formation oil |
| title_full_unstemmed | Developing features of the near-bottomhole zones in productive formations at fields with high gas saturation of formation oil |
| title_short | Developing features of the near-bottomhole zones in productive formations at fields with high gas saturation of formation oil |
| title_sort | developing features of the near bottomhole zones in productive formations at fields with high gas saturation of formation oil |
| topic | skin factor hydrodynamic investigations of wells multidimensional mathematical model gas oil ratio near-bottomhole zone |
| url | https://pmi.spmi.ru/index.php/pmi/article/view/13965?setLocale=en_US |
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