A novel well test model for fractured vuggy carbonate reservoirs with the vertical bead-on-a-string structure
The bead-on-a-string structure has been widely observed in many fractured vuggy carbonate reservoirs, especially in Shunbei oilfield, northwestern China. To date, there are still no appropriate well test methods for analyzing these reservoirs with the vertical bead-on-a-string structure. This paper...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Li, Qingyu [verfasserIn] Du, Xin [verfasserIn] Tang, Qingjun [verfasserIn] Xu, Yandong [verfasserIn] Li, Peichao [verfasserIn] Lu, Detang [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2020 |
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| Schlagwörter: |
Fractured vuggy carbonate reservoirs |
|---|
| Übergeordnetes Werk: |
Enthalten in: Journal of petroleum science and engineering - Amsterdam [u.a.] : Elsevier Science, 1987, 196 |
|---|---|
| Übergeordnetes Werk: |
volume:196 |
| DOI / URN: |
10.1016/j.petrol.2020.107938 |
|---|
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ELV005233364 |
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| 245 | 1 | 0 | |a A novel well test model for fractured vuggy carbonate reservoirs with the vertical bead-on-a-string structure |
| 264 | 1 | |c 2020 | |
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| 520 | |a The bead-on-a-string structure has been widely observed in many fractured vuggy carbonate reservoirs, especially in Shunbei oilfield, northwestern China. To date, there are still no appropriate well test methods for analyzing these reservoirs with the vertical bead-on-a-string structure. This paper proposes a new theoretical well test model, which considers the gravity effect and the natural fractures connecting the vuggs, to analyze this kind of reservoirs. First, we establish the mathematical model of fractured vuggy reservoirs with the vertical bead-on-a-string structure. With the different outer boundary conditions, Laplace transform and inversion are employed to solve the well test model. Then, the type curves for the well test model are plotted and discussed. It is found that the gravity effect can be equivalent to a type of constant pressure boundary condition. Take the three-region-two-cave as an example, type curves can be divided into nine distinct flow regimes, including wellbore storage, skin, linear flow I and II, transition flow I and II, vug storage I and II, and boundary flow. The transition flow and vug storage period are named as the vug storage effect. Subsequently, the effects of relevant parameters are studied. It is concluded that the depth of the drop during vug storage effect increases with increasing dimensionless vug storage constant C vD and dimensionless vug height z D2-z D1; the greater dimensionless gravity effect coefficient G D leads to the smaller equivalent boundary distance of the constant pressure boundary condition; the smaller the mobility ratio M 12, the earlier the appearance of the second linear flow regime; the larger the storage ratio ω 12, the more distinct the vug storage effect. Finally, two field case studies are carried out by using the proposed method. The locations and volumes of the caves are estimated, which shows that the proposed theoretical well test model has a great potential of obtaining the formation and cave parameters accurately. However, there is not available data that enable an accurate description of the locations and volumes of the caves by now, the proposed model still needs further field verifications. | ||
| 650 | 4 | |a Fractured vuggy carbonate reservoirs | |
| 650 | 4 | |a Vertical bead-on-a-string structure | |
| 650 | 4 | |a Well test | |
| 650 | 4 | |a Type curves | |
| 650 | 4 | |a Dimensionless gravity effect coefficient | |
| 700 | 1 | |a Du, Xin |e verfasserin |4 aut | |
| 700 | 1 | |a Tang, Qingjun |e verfasserin |4 aut | |
| 700 | 1 | |a Xu, Yandong |e verfasserin |4 aut | |
| 700 | 1 | |a Li, Peichao |e verfasserin |4 aut | |
| 700 | 1 | |a Lu, Detang |e verfasserin |4 aut | |
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10.1016/j.petrol.2020.107938 doi (DE-627)ELV005233364 (ELSEVIER)S0920-4105(20)30993-1 DE-627 ger DE-627 rda eng 660 DE-600 38.51 bkl 57.36 bkl Li, Qingyu verfasserin aut A novel well test model for fractured vuggy carbonate reservoirs with the vertical bead-on-a-string structure 2020 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The bead-on-a-string structure has been widely observed in many fractured vuggy carbonate reservoirs, especially in Shunbei oilfield, northwestern China. To date, there are still no appropriate well test methods for analyzing these reservoirs with the vertical bead-on-a-string structure. This paper proposes a new theoretical well test model, which considers the gravity effect and the natural fractures connecting the vuggs, to analyze this kind of reservoirs. First, we establish the mathematical model of fractured vuggy reservoirs with the vertical bead-on-a-string structure. With the different outer boundary conditions, Laplace transform and inversion are employed to solve the well test model. Then, the type curves for the well test model are plotted and discussed. It is found that the gravity effect can be equivalent to a type of constant pressure boundary condition. Take the three-region-two-cave as an example, type curves can be divided into nine distinct flow regimes, including wellbore storage, skin, linear flow I and II, transition flow I and II, vug storage I and II, and boundary flow. The transition flow and vug storage period are named as the vug storage effect. Subsequently, the effects of relevant parameters are studied. It is concluded that the depth of the drop during vug storage effect increases with increasing dimensionless vug storage constant C vD and dimensionless vug height z D2-z D1; the greater dimensionless gravity effect coefficient G D leads to the smaller equivalent boundary distance of the constant pressure boundary condition; the smaller the mobility ratio M 12, the earlier the appearance of the second linear flow regime; the larger the storage ratio ω 12, the more distinct the vug storage effect. Finally, two field case studies are carried out by using the proposed method. The locations and volumes of the caves are estimated, which shows that the proposed theoretical well test model has a great potential of obtaining the formation and cave parameters accurately. However, there is not available data that enable an accurate description of the locations and volumes of the caves by now, the proposed model still needs further field verifications. Fractured vuggy carbonate reservoirs Vertical bead-on-a-string structure Well test Type curves Dimensionless gravity effect coefficient Du, Xin verfasserin aut Tang, Qingjun verfasserin aut Xu, Yandong verfasserin aut Li, Peichao verfasserin aut Lu, Detang verfasserin aut Enthalten in Journal of petroleum science and engineering Amsterdam [u.a.] : Elsevier Science, 1987 196 Online-Ressource (DE-627)303393076 (DE-600)1494872-2 (DE-576)259484024 nnns volume:196 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 38.51 Geologie fossiler Brennstoffe 57.36 Erdölgewinnung Erdgasgewinnung AR 196 |
| spelling |
10.1016/j.petrol.2020.107938 doi (DE-627)ELV005233364 (ELSEVIER)S0920-4105(20)30993-1 DE-627 ger DE-627 rda eng 660 DE-600 38.51 bkl 57.36 bkl Li, Qingyu verfasserin aut A novel well test model for fractured vuggy carbonate reservoirs with the vertical bead-on-a-string structure 2020 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The bead-on-a-string structure has been widely observed in many fractured vuggy carbonate reservoirs, especially in Shunbei oilfield, northwestern China. To date, there are still no appropriate well test methods for analyzing these reservoirs with the vertical bead-on-a-string structure. This paper proposes a new theoretical well test model, which considers the gravity effect and the natural fractures connecting the vuggs, to analyze this kind of reservoirs. First, we establish the mathematical model of fractured vuggy reservoirs with the vertical bead-on-a-string structure. With the different outer boundary conditions, Laplace transform and inversion are employed to solve the well test model. Then, the type curves for the well test model are plotted and discussed. It is found that the gravity effect can be equivalent to a type of constant pressure boundary condition. Take the three-region-two-cave as an example, type curves can be divided into nine distinct flow regimes, including wellbore storage, skin, linear flow I and II, transition flow I and II, vug storage I and II, and boundary flow. The transition flow and vug storage period are named as the vug storage effect. Subsequently, the effects of relevant parameters are studied. It is concluded that the depth of the drop during vug storage effect increases with increasing dimensionless vug storage constant C vD and dimensionless vug height z D2-z D1; the greater dimensionless gravity effect coefficient G D leads to the smaller equivalent boundary distance of the constant pressure boundary condition; the smaller the mobility ratio M 12, the earlier the appearance of the second linear flow regime; the larger the storage ratio ω 12, the more distinct the vug storage effect. Finally, two field case studies are carried out by using the proposed method. The locations and volumes of the caves are estimated, which shows that the proposed theoretical well test model has a great potential of obtaining the formation and cave parameters accurately. However, there is not available data that enable an accurate description of the locations and volumes of the caves by now, the proposed model still needs further field verifications. Fractured vuggy carbonate reservoirs Vertical bead-on-a-string structure Well test Type curves Dimensionless gravity effect coefficient Du, Xin verfasserin aut Tang, Qingjun verfasserin aut Xu, Yandong verfasserin aut Li, Peichao verfasserin aut Lu, Detang verfasserin aut Enthalten in Journal of petroleum science and engineering Amsterdam [u.a.] : Elsevier Science, 1987 196 Online-Ressource (DE-627)303393076 (DE-600)1494872-2 (DE-576)259484024 nnns volume:196 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 38.51 Geologie fossiler Brennstoffe 57.36 Erdölgewinnung Erdgasgewinnung AR 196 |
| allfields_unstemmed |
10.1016/j.petrol.2020.107938 doi (DE-627)ELV005233364 (ELSEVIER)S0920-4105(20)30993-1 DE-627 ger DE-627 rda eng 660 DE-600 38.51 bkl 57.36 bkl Li, Qingyu verfasserin aut A novel well test model for fractured vuggy carbonate reservoirs with the vertical bead-on-a-string structure 2020 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The bead-on-a-string structure has been widely observed in many fractured vuggy carbonate reservoirs, especially in Shunbei oilfield, northwestern China. To date, there are still no appropriate well test methods for analyzing these reservoirs with the vertical bead-on-a-string structure. This paper proposes a new theoretical well test model, which considers the gravity effect and the natural fractures connecting the vuggs, to analyze this kind of reservoirs. First, we establish the mathematical model of fractured vuggy reservoirs with the vertical bead-on-a-string structure. With the different outer boundary conditions, Laplace transform and inversion are employed to solve the well test model. Then, the type curves for the well test model are plotted and discussed. It is found that the gravity effect can be equivalent to a type of constant pressure boundary condition. Take the three-region-two-cave as an example, type curves can be divided into nine distinct flow regimes, including wellbore storage, skin, linear flow I and II, transition flow I and II, vug storage I and II, and boundary flow. The transition flow and vug storage period are named as the vug storage effect. Subsequently, the effects of relevant parameters are studied. It is concluded that the depth of the drop during vug storage effect increases with increasing dimensionless vug storage constant C vD and dimensionless vug height z D2-z D1; the greater dimensionless gravity effect coefficient G D leads to the smaller equivalent boundary distance of the constant pressure boundary condition; the smaller the mobility ratio M 12, the earlier the appearance of the second linear flow regime; the larger the storage ratio ω 12, the more distinct the vug storage effect. Finally, two field case studies are carried out by using the proposed method. The locations and volumes of the caves are estimated, which shows that the proposed theoretical well test model has a great potential of obtaining the formation and cave parameters accurately. However, there is not available data that enable an accurate description of the locations and volumes of the caves by now, the proposed model still needs further field verifications. Fractured vuggy carbonate reservoirs Vertical bead-on-a-string structure Well test Type curves Dimensionless gravity effect coefficient Du, Xin verfasserin aut Tang, Qingjun verfasserin aut Xu, Yandong verfasserin aut Li, Peichao verfasserin aut Lu, Detang verfasserin aut Enthalten in Journal of petroleum science and engineering Amsterdam [u.a.] : Elsevier Science, 1987 196 Online-Ressource (DE-627)303393076 (DE-600)1494872-2 (DE-576)259484024 nnns volume:196 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 38.51 Geologie fossiler Brennstoffe 57.36 Erdölgewinnung Erdgasgewinnung AR 196 |
| allfieldsGer |
10.1016/j.petrol.2020.107938 doi (DE-627)ELV005233364 (ELSEVIER)S0920-4105(20)30993-1 DE-627 ger DE-627 rda eng 660 DE-600 38.51 bkl 57.36 bkl Li, Qingyu verfasserin aut A novel well test model for fractured vuggy carbonate reservoirs with the vertical bead-on-a-string structure 2020 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The bead-on-a-string structure has been widely observed in many fractured vuggy carbonate reservoirs, especially in Shunbei oilfield, northwestern China. To date, there are still no appropriate well test methods for analyzing these reservoirs with the vertical bead-on-a-string structure. This paper proposes a new theoretical well test model, which considers the gravity effect and the natural fractures connecting the vuggs, to analyze this kind of reservoirs. First, we establish the mathematical model of fractured vuggy reservoirs with the vertical bead-on-a-string structure. With the different outer boundary conditions, Laplace transform and inversion are employed to solve the well test model. Then, the type curves for the well test model are plotted and discussed. It is found that the gravity effect can be equivalent to a type of constant pressure boundary condition. Take the three-region-two-cave as an example, type curves can be divided into nine distinct flow regimes, including wellbore storage, skin, linear flow I and II, transition flow I and II, vug storage I and II, and boundary flow. The transition flow and vug storage period are named as the vug storage effect. Subsequently, the effects of relevant parameters are studied. It is concluded that the depth of the drop during vug storage effect increases with increasing dimensionless vug storage constant C vD and dimensionless vug height z D2-z D1; the greater dimensionless gravity effect coefficient G D leads to the smaller equivalent boundary distance of the constant pressure boundary condition; the smaller the mobility ratio M 12, the earlier the appearance of the second linear flow regime; the larger the storage ratio ω 12, the more distinct the vug storage effect. Finally, two field case studies are carried out by using the proposed method. The locations and volumes of the caves are estimated, which shows that the proposed theoretical well test model has a great potential of obtaining the formation and cave parameters accurately. However, there is not available data that enable an accurate description of the locations and volumes of the caves by now, the proposed model still needs further field verifications. Fractured vuggy carbonate reservoirs Vertical bead-on-a-string structure Well test Type curves Dimensionless gravity effect coefficient Du, Xin verfasserin aut Tang, Qingjun verfasserin aut Xu, Yandong verfasserin aut Li, Peichao verfasserin aut Lu, Detang verfasserin aut Enthalten in Journal of petroleum science and engineering Amsterdam [u.a.] : Elsevier Science, 1987 196 Online-Ressource (DE-627)303393076 (DE-600)1494872-2 (DE-576)259484024 nnns volume:196 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 38.51 Geologie fossiler Brennstoffe 57.36 Erdölgewinnung Erdgasgewinnung AR 196 |
| allfieldsSound |
10.1016/j.petrol.2020.107938 doi (DE-627)ELV005233364 (ELSEVIER)S0920-4105(20)30993-1 DE-627 ger DE-627 rda eng 660 DE-600 38.51 bkl 57.36 bkl Li, Qingyu verfasserin aut A novel well test model for fractured vuggy carbonate reservoirs with the vertical bead-on-a-string structure 2020 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The bead-on-a-string structure has been widely observed in many fractured vuggy carbonate reservoirs, especially in Shunbei oilfield, northwestern China. To date, there are still no appropriate well test methods for analyzing these reservoirs with the vertical bead-on-a-string structure. This paper proposes a new theoretical well test model, which considers the gravity effect and the natural fractures connecting the vuggs, to analyze this kind of reservoirs. First, we establish the mathematical model of fractured vuggy reservoirs with the vertical bead-on-a-string structure. With the different outer boundary conditions, Laplace transform and inversion are employed to solve the well test model. Then, the type curves for the well test model are plotted and discussed. It is found that the gravity effect can be equivalent to a type of constant pressure boundary condition. Take the three-region-two-cave as an example, type curves can be divided into nine distinct flow regimes, including wellbore storage, skin, linear flow I and II, transition flow I and II, vug storage I and II, and boundary flow. The transition flow and vug storage period are named as the vug storage effect. Subsequently, the effects of relevant parameters are studied. It is concluded that the depth of the drop during vug storage effect increases with increasing dimensionless vug storage constant C vD and dimensionless vug height z D2-z D1; the greater dimensionless gravity effect coefficient G D leads to the smaller equivalent boundary distance of the constant pressure boundary condition; the smaller the mobility ratio M 12, the earlier the appearance of the second linear flow regime; the larger the storage ratio ω 12, the more distinct the vug storage effect. Finally, two field case studies are carried out by using the proposed method. The locations and volumes of the caves are estimated, which shows that the proposed theoretical well test model has a great potential of obtaining the formation and cave parameters accurately. However, there is not available data that enable an accurate description of the locations and volumes of the caves by now, the proposed model still needs further field verifications. Fractured vuggy carbonate reservoirs Vertical bead-on-a-string structure Well test Type curves Dimensionless gravity effect coefficient Du, Xin verfasserin aut Tang, Qingjun verfasserin aut Xu, Yandong verfasserin aut Li, Peichao verfasserin aut Lu, Detang verfasserin aut Enthalten in Journal of petroleum science and engineering Amsterdam [u.a.] : Elsevier Science, 1987 196 Online-Ressource (DE-627)303393076 (DE-600)1494872-2 (DE-576)259484024 nnns volume:196 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 38.51 Geologie fossiler Brennstoffe 57.36 Erdölgewinnung Erdgasgewinnung AR 196 |
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Li, Qingyu |
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Li, Qingyu ddc 660 bkl 38.51 bkl 57.36 misc Fractured vuggy carbonate reservoirs misc Vertical bead-on-a-string structure misc Well test misc Type curves misc Dimensionless gravity effect coefficient A novel well test model for fractured vuggy carbonate reservoirs with the vertical bead-on-a-string structure |
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660 DE-600 38.51 bkl 57.36 bkl A novel well test model for fractured vuggy carbonate reservoirs with the vertical bead-on-a-string structure Fractured vuggy carbonate reservoirs Vertical bead-on-a-string structure Well test Type curves Dimensionless gravity effect coefficient |
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ddc 660 bkl 38.51 bkl 57.36 misc Fractured vuggy carbonate reservoirs misc Vertical bead-on-a-string structure misc Well test misc Type curves misc Dimensionless gravity effect coefficient |
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ddc 660 bkl 38.51 bkl 57.36 misc Fractured vuggy carbonate reservoirs misc Vertical bead-on-a-string structure misc Well test misc Type curves misc Dimensionless gravity effect coefficient |
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A novel well test model for fractured vuggy carbonate reservoirs with the vertical bead-on-a-string structure |
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Li, Qingyu |
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Li, Qingyu Du, Xin Tang, Qingjun Xu, Yandong Li, Peichao Lu, Detang |
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10.1016/j.petrol.2020.107938 |
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a novel well test model for fractured vuggy carbonate reservoirs with the vertical bead-on-a-string structure |
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A novel well test model for fractured vuggy carbonate reservoirs with the vertical bead-on-a-string structure |
| abstract |
The bead-on-a-string structure has been widely observed in many fractured vuggy carbonate reservoirs, especially in Shunbei oilfield, northwestern China. To date, there are still no appropriate well test methods for analyzing these reservoirs with the vertical bead-on-a-string structure. This paper proposes a new theoretical well test model, which considers the gravity effect and the natural fractures connecting the vuggs, to analyze this kind of reservoirs. First, we establish the mathematical model of fractured vuggy reservoirs with the vertical bead-on-a-string structure. With the different outer boundary conditions, Laplace transform and inversion are employed to solve the well test model. Then, the type curves for the well test model are plotted and discussed. It is found that the gravity effect can be equivalent to a type of constant pressure boundary condition. Take the three-region-two-cave as an example, type curves can be divided into nine distinct flow regimes, including wellbore storage, skin, linear flow I and II, transition flow I and II, vug storage I and II, and boundary flow. The transition flow and vug storage period are named as the vug storage effect. Subsequently, the effects of relevant parameters are studied. It is concluded that the depth of the drop during vug storage effect increases with increasing dimensionless vug storage constant C vD and dimensionless vug height z D2-z D1; the greater dimensionless gravity effect coefficient G D leads to the smaller equivalent boundary distance of the constant pressure boundary condition; the smaller the mobility ratio M 12, the earlier the appearance of the second linear flow regime; the larger the storage ratio ω 12, the more distinct the vug storage effect. Finally, two field case studies are carried out by using the proposed method. The locations and volumes of the caves are estimated, which shows that the proposed theoretical well test model has a great potential of obtaining the formation and cave parameters accurately. However, there is not available data that enable an accurate description of the locations and volumes of the caves by now, the proposed model still needs further field verifications. |
| abstractGer |
The bead-on-a-string structure has been widely observed in many fractured vuggy carbonate reservoirs, especially in Shunbei oilfield, northwestern China. To date, there are still no appropriate well test methods for analyzing these reservoirs with the vertical bead-on-a-string structure. This paper proposes a new theoretical well test model, which considers the gravity effect and the natural fractures connecting the vuggs, to analyze this kind of reservoirs. First, we establish the mathematical model of fractured vuggy reservoirs with the vertical bead-on-a-string structure. With the different outer boundary conditions, Laplace transform and inversion are employed to solve the well test model. Then, the type curves for the well test model are plotted and discussed. It is found that the gravity effect can be equivalent to a type of constant pressure boundary condition. Take the three-region-two-cave as an example, type curves can be divided into nine distinct flow regimes, including wellbore storage, skin, linear flow I and II, transition flow I and II, vug storage I and II, and boundary flow. The transition flow and vug storage period are named as the vug storage effect. Subsequently, the effects of relevant parameters are studied. It is concluded that the depth of the drop during vug storage effect increases with increasing dimensionless vug storage constant C vD and dimensionless vug height z D2-z D1; the greater dimensionless gravity effect coefficient G D leads to the smaller equivalent boundary distance of the constant pressure boundary condition; the smaller the mobility ratio M 12, the earlier the appearance of the second linear flow regime; the larger the storage ratio ω 12, the more distinct the vug storage effect. Finally, two field case studies are carried out by using the proposed method. The locations and volumes of the caves are estimated, which shows that the proposed theoretical well test model has a great potential of obtaining the formation and cave parameters accurately. However, there is not available data that enable an accurate description of the locations and volumes of the caves by now, the proposed model still needs further field verifications. |
| abstract_unstemmed |
The bead-on-a-string structure has been widely observed in many fractured vuggy carbonate reservoirs, especially in Shunbei oilfield, northwestern China. To date, there are still no appropriate well test methods for analyzing these reservoirs with the vertical bead-on-a-string structure. This paper proposes a new theoretical well test model, which considers the gravity effect and the natural fractures connecting the vuggs, to analyze this kind of reservoirs. First, we establish the mathematical model of fractured vuggy reservoirs with the vertical bead-on-a-string structure. With the different outer boundary conditions, Laplace transform and inversion are employed to solve the well test model. Then, the type curves for the well test model are plotted and discussed. It is found that the gravity effect can be equivalent to a type of constant pressure boundary condition. Take the three-region-two-cave as an example, type curves can be divided into nine distinct flow regimes, including wellbore storage, skin, linear flow I and II, transition flow I and II, vug storage I and II, and boundary flow. The transition flow and vug storage period are named as the vug storage effect. Subsequently, the effects of relevant parameters are studied. It is concluded that the depth of the drop during vug storage effect increases with increasing dimensionless vug storage constant C vD and dimensionless vug height z D2-z D1; the greater dimensionless gravity effect coefficient G D leads to the smaller equivalent boundary distance of the constant pressure boundary condition; the smaller the mobility ratio M 12, the earlier the appearance of the second linear flow regime; the larger the storage ratio ω 12, the more distinct the vug storage effect. Finally, two field case studies are carried out by using the proposed method. The locations and volumes of the caves are estimated, which shows that the proposed theoretical well test model has a great potential of obtaining the formation and cave parameters accurately. However, there is not available data that enable an accurate description of the locations and volumes of the caves by now, the proposed model still needs further field verifications. |
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A novel well test model for fractured vuggy carbonate reservoirs with the vertical bead-on-a-string structure |
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| score |
7.3994493 |