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Compressibility of Abnormal Pressure Gas Reservoirs and Its Effect on Reserves
[Image: see text] The compressibility of abnormal pressure gas reservoirs is hard to test, and the interpretation is confusing, leading to many misunderstandings in the current understanding of abnormal pressure gas reservoirs. In this research, a high-pressure experimental system was designed, and...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2021
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8515566/ https://www.ncbi.nlm.nih.gov/pubmed/34660981 http://dx.doi.org/10.1021/acsomega.1c03228 |
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author | Zhang, Jianzhong Gao, Tianrun |
author_facet | Zhang, Jianzhong Gao, Tianrun |
author_sort | Zhang, Jianzhong |
collection | PubMed |
description | [Image: see text] The compressibility of abnormal pressure gas reservoirs is hard to test, and the interpretation is confusing, leading to many misunderstandings in the current understanding of abnormal pressure gas reservoirs. In this research, a high-pressure experimental system was designed, and a series of high-pressure compressibility tests of pure water, nitrogen, and rocks under different water saturations were carried out. Then, the effective compressibility of gas reservoirs was calculated; the effect of water saturation on abnormal pressure gas reservoirs and the dynamic prediction was studied. The results show that the compressibilities of water and rock are effectively constant values over the range examined, while the compressibility of gas decreases exponentially with the increase in pressure. The effective compressibility of the stratum increases with the rise of water saturation. The theory of stress and strain of rock mechanics also shows that the rock compressibility is determined by Young’s modulus, Poisson’s ratio, and porosity and has no connection with the formation pressure. With the increase in water saturation, the swelling degree of the production indicator curve of the simulation experiment becomes larger and larger. After introducing the effective compressibility of the stratum into the gas–water material balance equation, the gas reserves predicted by the revised production indicator curve are the same as the original reserves. The research results have important guiding significance for the efficient development of gas reservoirs. |
format | Online Article Text |
id | pubmed-8515566 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-85155662021-10-15 Compressibility of Abnormal Pressure Gas Reservoirs and Its Effect on Reserves Zhang, Jianzhong Gao, Tianrun ACS Omega [Image: see text] The compressibility of abnormal pressure gas reservoirs is hard to test, and the interpretation is confusing, leading to many misunderstandings in the current understanding of abnormal pressure gas reservoirs. In this research, a high-pressure experimental system was designed, and a series of high-pressure compressibility tests of pure water, nitrogen, and rocks under different water saturations were carried out. Then, the effective compressibility of gas reservoirs was calculated; the effect of water saturation on abnormal pressure gas reservoirs and the dynamic prediction was studied. The results show that the compressibilities of water and rock are effectively constant values over the range examined, while the compressibility of gas decreases exponentially with the increase in pressure. The effective compressibility of the stratum increases with the rise of water saturation. The theory of stress and strain of rock mechanics also shows that the rock compressibility is determined by Young’s modulus, Poisson’s ratio, and porosity and has no connection with the formation pressure. With the increase in water saturation, the swelling degree of the production indicator curve of the simulation experiment becomes larger and larger. After introducing the effective compressibility of the stratum into the gas–water material balance equation, the gas reserves predicted by the revised production indicator curve are the same as the original reserves. The research results have important guiding significance for the efficient development of gas reservoirs. American Chemical Society 2021-09-28 /pmc/articles/PMC8515566/ /pubmed/34660981 http://dx.doi.org/10.1021/acsomega.1c03228 Text en © 2021 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Zhang, Jianzhong Gao, Tianrun Compressibility of Abnormal Pressure Gas Reservoirs and Its Effect on Reserves |
title | Compressibility of Abnormal Pressure Gas Reservoirs
and Its Effect on Reserves |
title_full | Compressibility of Abnormal Pressure Gas Reservoirs
and Its Effect on Reserves |
title_fullStr | Compressibility of Abnormal Pressure Gas Reservoirs
and Its Effect on Reserves |
title_full_unstemmed | Compressibility of Abnormal Pressure Gas Reservoirs
and Its Effect on Reserves |
title_short | Compressibility of Abnormal Pressure Gas Reservoirs
and Its Effect on Reserves |
title_sort | compressibility of abnormal pressure gas reservoirs
and its effect on reserves |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8515566/ https://www.ncbi.nlm.nih.gov/pubmed/34660981 http://dx.doi.org/10.1021/acsomega.1c03228 |
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