Derivation and application of a new formula of the elastic two-phase method
For volumetric closed gas reservoirs, when the gas well produces with stable production rate, it can be divided into unsteady state stage, transient stage and pseudo steady state stage according to the variation behaviours of flowing bottom hole pressure and producing time. The unsteady state stage...
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Editorial Department of Petroleum Reservoir Evaluation and Development
2023-04-01
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| Series: | Youqicang pingjia yu kaifa |
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| Online Access: | https://red.magtech.org.cn/fileup/2095-1426/PDF/1682496887906-1421653567.pdf |
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| author | CHEN Yuanqian,SHI Xiaomin |
| author_facet | CHEN Yuanqian,SHI Xiaomin |
| author_sort | CHEN Yuanqian,SHI Xiaomin |
| collection | DOAJ |
| description | For volumetric closed gas reservoirs, when the gas well produces with stable production rate, it can be divided into unsteady state stage, transient stage and pseudo steady state stage according to the variation behaviours of flowing bottom hole pressure and producing time. The unsteady state stage is called the elastic one-phase stage, and the pseudo steady state stage is called the elastic two-phase stage. The latter is a dynamic method to evaluate the Original Gas in Place（OGIP） controlled by gas wells. The elastic two-phase method proposed by CHEN Yuanqian in 1991 in the pseudo steady state stage has been repeatedly listed in the National Oil and Gas Industry Standards, and has been widely valued and applied in China. Based on the diffusion equation considering the elastic expansions of natural gas, rock and irreducible water in a gas well with stable production in the finite closed gas reservoir boundary, a new elastic two-phase method for the pseudo steady state stage represented by flowing bottom hole pressure and cumulative production rate is derived, which can be used to evaluate the original gas in place（OGIP）controlled by a gas well. The new formula of elastic two-phase method is superior to the old formula which based on the relationship between flowing bottom hole pressure and production time, and the new can overcome the influence of production fluctuation on the evaluation results. The application shows that the new formula of elastic two-phase method is practical and effective. |
| format | Article |
| id | doaj-art-6a66bc445a164f0b96a84bb8a9abefdb |
| institution | DOAJ |
| issn | 2095-1426 |
| language | zho |
| publishDate | 2023-04-01 |
| publisher | Editorial Department of Petroleum Reservoir Evaluation and Development |
| record_format | Article |
| series | Youqicang pingjia yu kaifa |
| spelling | doaj-art-6a66bc445a164f0b96a84bb8a9abefdb2025-08-20T03:19:19ZzhoEditorial Department of Petroleum Reservoir Evaluation and DevelopmentYouqicang pingjia yu kaifa2095-14262023-04-0113213514010.13809/j.cnki.cn32-1825/te.2023.02.001Derivation and application of a new formula of the elastic two-phase methodCHEN Yuanqian,SHI Xiaomin0CNPC Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaFor volumetric closed gas reservoirs, when the gas well produces with stable production rate, it can be divided into unsteady state stage, transient stage and pseudo steady state stage according to the variation behaviours of flowing bottom hole pressure and producing time. The unsteady state stage is called the elastic one-phase stage, and the pseudo steady state stage is called the elastic two-phase stage. The latter is a dynamic method to evaluate the Original Gas in Place（OGIP） controlled by gas wells. The elastic two-phase method proposed by CHEN Yuanqian in 1991 in the pseudo steady state stage has been repeatedly listed in the National Oil and Gas Industry Standards, and has been widely valued and applied in China. Based on the diffusion equation considering the elastic expansions of natural gas, rock and irreducible water in a gas well with stable production in the finite closed gas reservoir boundary, a new elastic two-phase method for the pseudo steady state stage represented by flowing bottom hole pressure and cumulative production rate is derived, which can be used to evaluate the original gas in place（OGIP）controlled by a gas well. The new formula of elastic two-phase method is superior to the old formula which based on the relationship between flowing bottom hole pressure and production time, and the new can overcome the influence of production fluctuation on the evaluation results. The application shows that the new formula of elastic two-phase method is practical and effective.https://red.magtech.org.cn/fileup/2095-1426/PDF/1682496887906-1421653567.pdf|volumetric closed gas reservoir|pseudo steady state stage|elastic two-phase method|original gas in place|new formula|derivation|application |
| spellingShingle | CHEN Yuanqian,SHI Xiaomin Derivation and application of a new formula of the elastic two-phase method Youqicang pingjia yu kaifa |volumetric closed gas reservoir|pseudo steady state stage|elastic two-phase method|original gas in place|new formula|derivation|application |
| title | Derivation and application of a new formula of the elastic two-phase method |
| title_full | Derivation and application of a new formula of the elastic two-phase method |
| title_fullStr | Derivation and application of a new formula of the elastic two-phase method |
| title_full_unstemmed | Derivation and application of a new formula of the elastic two-phase method |
| title_short | Derivation and application of a new formula of the elastic two-phase method |
| title_sort | derivation and application of a new formula of the elastic two phase method |
| topic | |volumetric closed gas reservoir|pseudo steady state stage|elastic two-phase method|original gas in place|new formula|derivation|application |
| url | https://red.magtech.org.cn/fileup/2095-1426/PDF/1682496887906-1421653567.pdf |
| work_keys_str_mv | AT chenyuanqianshixiaomin derivationandapplicationofanewformulaoftheelastictwophasemethod |