The Experts below are selected from a list of 11469 Experts worldwide ranked by ideXlab platform
Fugang Wang - One of the best experts on this subject based on the ideXlab platform.
-
Impacts of salinity on CO 2 spatial distribution and storage amount in the formation with different Dip Angles.
Environmental Science and Pollution Research, 2019Co-Authors: Jing Jing, Yanlin Yang, Zhonghua Tang, Fugang WangAbstract:Formation Dip Angle and the distortion of salinity affect the spatial distribution and storage capacity of carbon dioxide (CO2). In this numerical study, based on an actual CO2 injection demonstration project (Shiqianfeng group in the Ordos Basin) in China, CO2 was injected for a period of 20 years at four different formation Dip Angles (0°, 5°, 10°, 15°). In conjunction, some salinity values were chosen, ranging from saturation salinity to no salinity. A three-dimensional (3D) model was established to systematically explore the influence of different formation Dip Angles and salinities on the CO2 spatial distribution and storage amount. The simulation results showed that larger salinity and higher pressure near the injection well will lead the CO2 gas-phase saturation and mass fraction to be smaller for a given formation Dip Angle. When salinity is held constant at the saturation value, a larger Dip Angle will cause a smaller CO2 gas saturation in the upper right units of the injection well, and a larger gas saturation in the lower left units at the 20th year of CO2 injection. For large salinity values (full, half, and quarter saturation salinity), the larger the formation Dip Angle is, the greater the CO2 total storage amount. For smaller salinity values (0.00 and 0.03), a transition point existed (at 8 and 18.2 years) during the 20-year injection period. Before the transition point, the CO2 total storage amount also increases with the Dip Angle. After the transition point, however, the larger the formation Dip Angle is, the smaller the CO2 total storage amount becomes. In addition, a lower salinity may lead to the earlier appearance of the transition point.
-
Impacts of stratum Dip Angle on CO2geological storage amount and security: Original Research Article: Impacts of stratum Dip Angle on CO2geological storage amount
Greenhouse Gases: Science and Technology, 2016Co-Authors: Fugang Wang, Jing Jing, Yanlin Yang, Guangrong JinAbstract:Storage strata are usually generalized as horizontal when using numerical simulation methods to analyze CO 2 geological storage in saline aquifers. However, horizontal strata are not common in nature. Most strata have gradients, because of the effects of geological structure and diagenesis. Based on the actual strata Dip Angle variation range of two CO 2 injection demonstration projects in China, five modeling schemes were designed to investigate the impact of formation Dip on CO 2 storage amount and space migration of gas‐phase CO 2 in reservoir formation. The results show that the total CO 2 storage amount is inversely proportional to formation Dip, and after injection is halted, storage amounts of upper and lower parts of the same stratum reservoir have a reverse trend. Formation Dip has a significant impact on the migration of CO 2 . The greater the formation Dip, the more significant the effect on CO 2 migration distance. Given the low porosity and permeability of the Shiqianfeng formation reservoir in the case study, when the stratum Dip Angle is 16°, at centennial time scale, CO 2 migration distance is 47.06% greater than that in the horizontal reservoir. We expect that for storage reservoirs with high porosity and permeability, the influence of formation Dip on CO 2 migration will be more significant. Because non‐horizontal strata are predominant in deep saline aquifers in nature, regardless of the influence of formation Dip, CO 2 leakage risks in geological storage will be greatly underestimated. Therefore, in research related to CO 2 geological storage, the stratum Dip Angle must be considered. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd
-
impacts of stratum Dip Angle on co2 geological storage amount and security
Greenhouse Gases-Science and Technology, 2016Co-Authors: Fugang Wang, Jing Jing, Yanlin Yang, Guangrong JinAbstract:Storage strata are usually generalized as horizontal when using numerical simulation methods to analyze CO 2 geological storage in saline aquifers. However, horizontal strata are not common in nature. Most strata have gradients, because of the effects of geological structure and diagenesis. Based on the actual strata Dip Angle variation range of two CO 2 injection demonstration projects in China, five modeling schemes were designed to investigate the impact of formation Dip on CO 2 storage amount and space migration of gas‐phase CO 2 in reservoir formation. The results show that the total CO 2 storage amount is inversely proportional to formation Dip, and after injection is halted, storage amounts of upper and lower parts of the same stratum reservoir have a reverse trend. Formation Dip has a significant impact on the migration of CO 2 . The greater the formation Dip, the more significant the effect on CO 2 migration distance. Given the low porosity and permeability of the Shiqianfeng formation reservoir in the case study, when the stratum Dip Angle is 16°, at centennial time scale, CO 2 migration distance is 47.06% greater than that in the horizontal reservoir. We expect that for storage reservoirs with high porosity and permeability, the influence of formation Dip on CO 2 migration will be more significant. Because non‐horizontal strata are predominant in deep saline aquifers in nature, regardless of the influence of formation Dip, CO 2 leakage risks in geological storage will be greatly underestimated. Therefore, in research related to CO 2 geological storage, the stratum Dip Angle must be considered. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd
-
Impacts of injection pressure of a Dip-Angle sloping strata reservoir with low porosity and permeability on CO2injection amount: Original Research Article: Impacts of injection pressure of a Dip-Angle sloping strata reservoir with low porosity
Greenhouse Gases: Science and Technology, 2016Co-Authors: Fugang Wang, Jing Jing, Yanlin Yang, Hongyan Liu, Zhaojun Sun, Hailong TianAbstract:Sloping strata reservoirs with low porosity and permeability are widely distributed in China. The first CO 2 capture and geological storage (CCS) demonstration project in China that has been constructed in the Ordos Basin is a representative. In this paper, a 3D numerical model was constructed to evaluate the influence of injection pressure and strata Dip Angle on the CO 2 injection amount in a sloping strata reservoir during CO 2 injection period. We reached the following conclusions: (i) There is a ‘balance time point (BTP)’ for the total CO 2 injection amount between a horizontal reservoir and a sloping one, and the BTP will decrease with the injection pressure increase. (ii) The influence of the Dip Angle of a sloping reservoir on the total injection amount is non‐monotonicity. For a fixed injection pressure, before the BTP, the greater the Dip Angle, the greater the CO 2 injection amount, but after the BTP, the change rule is reversed. (iii) The injection pressure significantly affected the total injected CO 2 amount, but the influence of the Dip Angle (in the range of 0° to 15°) on the total injection amount was not significant during injection. (iv) To a sloping reservoir, for long time injection (i.e., injection time is longer than the BTP), the bigger the Dip Angle, the greater the distance of the CO 2 upward migration, and the smaller the total injected amount compared to the horizontal reservoir. So, in actual site selection of a CCS project, the small Dip Angle reservoir was beneficial. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd.
Guangrong Jin - One of the best experts on this subject based on the ideXlab platform.
-
Impacts of stratum Dip Angle on CO2geological storage amount and security: Original Research Article: Impacts of stratum Dip Angle on CO2geological storage amount
Greenhouse Gases: Science and Technology, 2016Co-Authors: Fugang Wang, Jing Jing, Yanlin Yang, Guangrong JinAbstract:Storage strata are usually generalized as horizontal when using numerical simulation methods to analyze CO 2 geological storage in saline aquifers. However, horizontal strata are not common in nature. Most strata have gradients, because of the effects of geological structure and diagenesis. Based on the actual strata Dip Angle variation range of two CO 2 injection demonstration projects in China, five modeling schemes were designed to investigate the impact of formation Dip on CO 2 storage amount and space migration of gas‐phase CO 2 in reservoir formation. The results show that the total CO 2 storage amount is inversely proportional to formation Dip, and after injection is halted, storage amounts of upper and lower parts of the same stratum reservoir have a reverse trend. Formation Dip has a significant impact on the migration of CO 2 . The greater the formation Dip, the more significant the effect on CO 2 migration distance. Given the low porosity and permeability of the Shiqianfeng formation reservoir in the case study, when the stratum Dip Angle is 16°, at centennial time scale, CO 2 migration distance is 47.06% greater than that in the horizontal reservoir. We expect that for storage reservoirs with high porosity and permeability, the influence of formation Dip on CO 2 migration will be more significant. Because non‐horizontal strata are predominant in deep saline aquifers in nature, regardless of the influence of formation Dip, CO 2 leakage risks in geological storage will be greatly underestimated. Therefore, in research related to CO 2 geological storage, the stratum Dip Angle must be considered. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd
-
impacts of stratum Dip Angle on co2 geological storage amount and security
Greenhouse Gases-Science and Technology, 2016Co-Authors: Fugang Wang, Jing Jing, Yanlin Yang, Guangrong JinAbstract:Storage strata are usually generalized as horizontal when using numerical simulation methods to analyze CO 2 geological storage in saline aquifers. However, horizontal strata are not common in nature. Most strata have gradients, because of the effects of geological structure and diagenesis. Based on the actual strata Dip Angle variation range of two CO 2 injection demonstration projects in China, five modeling schemes were designed to investigate the impact of formation Dip on CO 2 storage amount and space migration of gas‐phase CO 2 in reservoir formation. The results show that the total CO 2 storage amount is inversely proportional to formation Dip, and after injection is halted, storage amounts of upper and lower parts of the same stratum reservoir have a reverse trend. Formation Dip has a significant impact on the migration of CO 2 . The greater the formation Dip, the more significant the effect on CO 2 migration distance. Given the low porosity and permeability of the Shiqianfeng formation reservoir in the case study, when the stratum Dip Angle is 16°, at centennial time scale, CO 2 migration distance is 47.06% greater than that in the horizontal reservoir. We expect that for storage reservoirs with high porosity and permeability, the influence of formation Dip on CO 2 migration will be more significant. Because non‐horizontal strata are predominant in deep saline aquifers in nature, regardless of the influence of formation Dip, CO 2 leakage risks in geological storage will be greatly underestimated. Therefore, in research related to CO 2 geological storage, the stratum Dip Angle must be considered. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd
Jing Jing - One of the best experts on this subject based on the ideXlab platform.
-
Impacts of salinity on CO 2 spatial distribution and storage amount in the formation with different Dip Angles.
Environmental Science and Pollution Research, 2019Co-Authors: Jing Jing, Yanlin Yang, Zhonghua Tang, Fugang WangAbstract:Formation Dip Angle and the distortion of salinity affect the spatial distribution and storage capacity of carbon dioxide (CO2). In this numerical study, based on an actual CO2 injection demonstration project (Shiqianfeng group in the Ordos Basin) in China, CO2 was injected for a period of 20 years at four different formation Dip Angles (0°, 5°, 10°, 15°). In conjunction, some salinity values were chosen, ranging from saturation salinity to no salinity. A three-dimensional (3D) model was established to systematically explore the influence of different formation Dip Angles and salinities on the CO2 spatial distribution and storage amount. The simulation results showed that larger salinity and higher pressure near the injection well will lead the CO2 gas-phase saturation and mass fraction to be smaller for a given formation Dip Angle. When salinity is held constant at the saturation value, a larger Dip Angle will cause a smaller CO2 gas saturation in the upper right units of the injection well, and a larger gas saturation in the lower left units at the 20th year of CO2 injection. For large salinity values (full, half, and quarter saturation salinity), the larger the formation Dip Angle is, the greater the CO2 total storage amount. For smaller salinity values (0.00 and 0.03), a transition point existed (at 8 and 18.2 years) during the 20-year injection period. Before the transition point, the CO2 total storage amount also increases with the Dip Angle. After the transition point, however, the larger the formation Dip Angle is, the smaller the CO2 total storage amount becomes. In addition, a lower salinity may lead to the earlier appearance of the transition point.
-
Effects of formation Dip Angle and salinity on the safety of CO2 geological storage - A case study of Shiqianfeng strata with low porosity and low permeability in the Ordos Basin, China
Journal of Cleaner Production, 2019Co-Authors: Jing Jing, Yanlin Yang, Zhonghua TangAbstract:Abstract The safety of CO2 geological storage is a key problem that hinders its implementation. In particular, the formation Dip Angle and salinity can directly affect the spatial migration distribution, storage form and storage amount of CO2. A three-dimensional simulation model was established to evaluate the effects of the formation Dip Angle and salinity on the safety of CO2 geological storage. The simulation results showed that a larger Dip Angle resulted in a greater CO2 migration distance. The greatest CO2 migration distances with formation Dip Angles of 0°, 5° and 10° were 60%, 73.3%, and 86.7%, respectively, compared with a formation Dip Angle of 15° in the 200th year of CO2 migration. A larger formation Dip Angle was not conducive to CO2 geological storage. When the salinity was greater, smaller values were obtained for the CO2 liquid phase mass fraction, CO2 gas phase, liquid phase and total storage amount. With salinity values of S,3/4S,1/2S,1/4S, and 0.03, the proportions of liquid-phase storage amount in the salt-free strata were determined as 26.2%, 38.0%, 54.3%, 74.5%, and 88.1%, respectively, after CO2 migration for 200 years. Higher salinity resulted in less dissolved CO2 and decreased CO2 geological storage safety. After considering the combined influence of the Dip Angle and salinity, we found that the effects of the Dip Angle were obvious on the unit pressure and gas phase saturation, and the effect of salinity on the CO2 liquid phase mass fraction was significant. A higher Dip Angle and salinity greatly decreased the CO2 geological storage safety. Thus, a reservoir with a smaller Dip Angle and lower salinity should be selected as a site for CO2 geological storage in future studies.
-
Impacts of stratum Dip Angle on CO2geological storage amount and security: Original Research Article: Impacts of stratum Dip Angle on CO2geological storage amount
Greenhouse Gases: Science and Technology, 2016Co-Authors: Fugang Wang, Jing Jing, Yanlin Yang, Guangrong JinAbstract:Storage strata are usually generalized as horizontal when using numerical simulation methods to analyze CO 2 geological storage in saline aquifers. However, horizontal strata are not common in nature. Most strata have gradients, because of the effects of geological structure and diagenesis. Based on the actual strata Dip Angle variation range of two CO 2 injection demonstration projects in China, five modeling schemes were designed to investigate the impact of formation Dip on CO 2 storage amount and space migration of gas‐phase CO 2 in reservoir formation. The results show that the total CO 2 storage amount is inversely proportional to formation Dip, and after injection is halted, storage amounts of upper and lower parts of the same stratum reservoir have a reverse trend. Formation Dip has a significant impact on the migration of CO 2 . The greater the formation Dip, the more significant the effect on CO 2 migration distance. Given the low porosity and permeability of the Shiqianfeng formation reservoir in the case study, when the stratum Dip Angle is 16°, at centennial time scale, CO 2 migration distance is 47.06% greater than that in the horizontal reservoir. We expect that for storage reservoirs with high porosity and permeability, the influence of formation Dip on CO 2 migration will be more significant. Because non‐horizontal strata are predominant in deep saline aquifers in nature, regardless of the influence of formation Dip, CO 2 leakage risks in geological storage will be greatly underestimated. Therefore, in research related to CO 2 geological storage, the stratum Dip Angle must be considered. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd
-
impacts of stratum Dip Angle on co2 geological storage amount and security
Greenhouse Gases-Science and Technology, 2016Co-Authors: Fugang Wang, Jing Jing, Yanlin Yang, Guangrong JinAbstract:Storage strata are usually generalized as horizontal when using numerical simulation methods to analyze CO 2 geological storage in saline aquifers. However, horizontal strata are not common in nature. Most strata have gradients, because of the effects of geological structure and diagenesis. Based on the actual strata Dip Angle variation range of two CO 2 injection demonstration projects in China, five modeling schemes were designed to investigate the impact of formation Dip on CO 2 storage amount and space migration of gas‐phase CO 2 in reservoir formation. The results show that the total CO 2 storage amount is inversely proportional to formation Dip, and after injection is halted, storage amounts of upper and lower parts of the same stratum reservoir have a reverse trend. Formation Dip has a significant impact on the migration of CO 2 . The greater the formation Dip, the more significant the effect on CO 2 migration distance. Given the low porosity and permeability of the Shiqianfeng formation reservoir in the case study, when the stratum Dip Angle is 16°, at centennial time scale, CO 2 migration distance is 47.06% greater than that in the horizontal reservoir. We expect that for storage reservoirs with high porosity and permeability, the influence of formation Dip on CO 2 migration will be more significant. Because non‐horizontal strata are predominant in deep saline aquifers in nature, regardless of the influence of formation Dip, CO 2 leakage risks in geological storage will be greatly underestimated. Therefore, in research related to CO 2 geological storage, the stratum Dip Angle must be considered. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd
-
Impacts of injection pressure of a Dip-Angle sloping strata reservoir with low porosity and permeability on CO2injection amount: Original Research Article: Impacts of injection pressure of a Dip-Angle sloping strata reservoir with low porosity
Greenhouse Gases: Science and Technology, 2016Co-Authors: Fugang Wang, Jing Jing, Yanlin Yang, Hongyan Liu, Zhaojun Sun, Hailong TianAbstract:Sloping strata reservoirs with low porosity and permeability are widely distributed in China. The first CO 2 capture and geological storage (CCS) demonstration project in China that has been constructed in the Ordos Basin is a representative. In this paper, a 3D numerical model was constructed to evaluate the influence of injection pressure and strata Dip Angle on the CO 2 injection amount in a sloping strata reservoir during CO 2 injection period. We reached the following conclusions: (i) There is a ‘balance time point (BTP)’ for the total CO 2 injection amount between a horizontal reservoir and a sloping one, and the BTP will decrease with the injection pressure increase. (ii) The influence of the Dip Angle of a sloping reservoir on the total injection amount is non‐monotonicity. For a fixed injection pressure, before the BTP, the greater the Dip Angle, the greater the CO 2 injection amount, but after the BTP, the change rule is reversed. (iii) The injection pressure significantly affected the total injected CO 2 amount, but the influence of the Dip Angle (in the range of 0° to 15°) on the total injection amount was not significant during injection. (iv) To a sloping reservoir, for long time injection (i.e., injection time is longer than the BTP), the bigger the Dip Angle, the greater the distance of the CO 2 upward migration, and the smaller the total injected amount compared to the horizontal reservoir. So, in actual site selection of a CCS project, the small Dip Angle reservoir was beneficial. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd.
Yanlin Yang - One of the best experts on this subject based on the ideXlab platform.
-
Impacts of salinity on CO 2 spatial distribution and storage amount in the formation with different Dip Angles.
Environmental Science and Pollution Research, 2019Co-Authors: Jing Jing, Yanlin Yang, Zhonghua Tang, Fugang WangAbstract:Formation Dip Angle and the distortion of salinity affect the spatial distribution and storage capacity of carbon dioxide (CO2). In this numerical study, based on an actual CO2 injection demonstration project (Shiqianfeng group in the Ordos Basin) in China, CO2 was injected for a period of 20 years at four different formation Dip Angles (0°, 5°, 10°, 15°). In conjunction, some salinity values were chosen, ranging from saturation salinity to no salinity. A three-dimensional (3D) model was established to systematically explore the influence of different formation Dip Angles and salinities on the CO2 spatial distribution and storage amount. The simulation results showed that larger salinity and higher pressure near the injection well will lead the CO2 gas-phase saturation and mass fraction to be smaller for a given formation Dip Angle. When salinity is held constant at the saturation value, a larger Dip Angle will cause a smaller CO2 gas saturation in the upper right units of the injection well, and a larger gas saturation in the lower left units at the 20th year of CO2 injection. For large salinity values (full, half, and quarter saturation salinity), the larger the formation Dip Angle is, the greater the CO2 total storage amount. For smaller salinity values (0.00 and 0.03), a transition point existed (at 8 and 18.2 years) during the 20-year injection period. Before the transition point, the CO2 total storage amount also increases with the Dip Angle. After the transition point, however, the larger the formation Dip Angle is, the smaller the CO2 total storage amount becomes. In addition, a lower salinity may lead to the earlier appearance of the transition point.
-
Effects of formation Dip Angle and salinity on the safety of CO2 geological storage - A case study of Shiqianfeng strata with low porosity and low permeability in the Ordos Basin, China
Journal of Cleaner Production, 2019Co-Authors: Jing Jing, Yanlin Yang, Zhonghua TangAbstract:Abstract The safety of CO2 geological storage is a key problem that hinders its implementation. In particular, the formation Dip Angle and salinity can directly affect the spatial migration distribution, storage form and storage amount of CO2. A three-dimensional simulation model was established to evaluate the effects of the formation Dip Angle and salinity on the safety of CO2 geological storage. The simulation results showed that a larger Dip Angle resulted in a greater CO2 migration distance. The greatest CO2 migration distances with formation Dip Angles of 0°, 5° and 10° were 60%, 73.3%, and 86.7%, respectively, compared with a formation Dip Angle of 15° in the 200th year of CO2 migration. A larger formation Dip Angle was not conducive to CO2 geological storage. When the salinity was greater, smaller values were obtained for the CO2 liquid phase mass fraction, CO2 gas phase, liquid phase and total storage amount. With salinity values of S,3/4S,1/2S,1/4S, and 0.03, the proportions of liquid-phase storage amount in the salt-free strata were determined as 26.2%, 38.0%, 54.3%, 74.5%, and 88.1%, respectively, after CO2 migration for 200 years. Higher salinity resulted in less dissolved CO2 and decreased CO2 geological storage safety. After considering the combined influence of the Dip Angle and salinity, we found that the effects of the Dip Angle were obvious on the unit pressure and gas phase saturation, and the effect of salinity on the CO2 liquid phase mass fraction was significant. A higher Dip Angle and salinity greatly decreased the CO2 geological storage safety. Thus, a reservoir with a smaller Dip Angle and lower salinity should be selected as a site for CO2 geological storage in future studies.
-
Impacts of stratum Dip Angle on CO2geological storage amount and security: Original Research Article: Impacts of stratum Dip Angle on CO2geological storage amount
Greenhouse Gases: Science and Technology, 2016Co-Authors: Fugang Wang, Jing Jing, Yanlin Yang, Guangrong JinAbstract:Storage strata are usually generalized as horizontal when using numerical simulation methods to analyze CO 2 geological storage in saline aquifers. However, horizontal strata are not common in nature. Most strata have gradients, because of the effects of geological structure and diagenesis. Based on the actual strata Dip Angle variation range of two CO 2 injection demonstration projects in China, five modeling schemes were designed to investigate the impact of formation Dip on CO 2 storage amount and space migration of gas‐phase CO 2 in reservoir formation. The results show that the total CO 2 storage amount is inversely proportional to formation Dip, and after injection is halted, storage amounts of upper and lower parts of the same stratum reservoir have a reverse trend. Formation Dip has a significant impact on the migration of CO 2 . The greater the formation Dip, the more significant the effect on CO 2 migration distance. Given the low porosity and permeability of the Shiqianfeng formation reservoir in the case study, when the stratum Dip Angle is 16°, at centennial time scale, CO 2 migration distance is 47.06% greater than that in the horizontal reservoir. We expect that for storage reservoirs with high porosity and permeability, the influence of formation Dip on CO 2 migration will be more significant. Because non‐horizontal strata are predominant in deep saline aquifers in nature, regardless of the influence of formation Dip, CO 2 leakage risks in geological storage will be greatly underestimated. Therefore, in research related to CO 2 geological storage, the stratum Dip Angle must be considered. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd
-
impacts of stratum Dip Angle on co2 geological storage amount and security
Greenhouse Gases-Science and Technology, 2016Co-Authors: Fugang Wang, Jing Jing, Yanlin Yang, Guangrong JinAbstract:Storage strata are usually generalized as horizontal when using numerical simulation methods to analyze CO 2 geological storage in saline aquifers. However, horizontal strata are not common in nature. Most strata have gradients, because of the effects of geological structure and diagenesis. Based on the actual strata Dip Angle variation range of two CO 2 injection demonstration projects in China, five modeling schemes were designed to investigate the impact of formation Dip on CO 2 storage amount and space migration of gas‐phase CO 2 in reservoir formation. The results show that the total CO 2 storage amount is inversely proportional to formation Dip, and after injection is halted, storage amounts of upper and lower parts of the same stratum reservoir have a reverse trend. Formation Dip has a significant impact on the migration of CO 2 . The greater the formation Dip, the more significant the effect on CO 2 migration distance. Given the low porosity and permeability of the Shiqianfeng formation reservoir in the case study, when the stratum Dip Angle is 16°, at centennial time scale, CO 2 migration distance is 47.06% greater than that in the horizontal reservoir. We expect that for storage reservoirs with high porosity and permeability, the influence of formation Dip on CO 2 migration will be more significant. Because non‐horizontal strata are predominant in deep saline aquifers in nature, regardless of the influence of formation Dip, CO 2 leakage risks in geological storage will be greatly underestimated. Therefore, in research related to CO 2 geological storage, the stratum Dip Angle must be considered. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd
-
Impacts of injection pressure of a Dip-Angle sloping strata reservoir with low porosity and permeability on CO2injection amount: Original Research Article: Impacts of injection pressure of a Dip-Angle sloping strata reservoir with low porosity
Greenhouse Gases: Science and Technology, 2016Co-Authors: Fugang Wang, Jing Jing, Yanlin Yang, Hongyan Liu, Zhaojun Sun, Hailong TianAbstract:Sloping strata reservoirs with low porosity and permeability are widely distributed in China. The first CO 2 capture and geological storage (CCS) demonstration project in China that has been constructed in the Ordos Basin is a representative. In this paper, a 3D numerical model was constructed to evaluate the influence of injection pressure and strata Dip Angle on the CO 2 injection amount in a sloping strata reservoir during CO 2 injection period. We reached the following conclusions: (i) There is a ‘balance time point (BTP)’ for the total CO 2 injection amount between a horizontal reservoir and a sloping one, and the BTP will decrease with the injection pressure increase. (ii) The influence of the Dip Angle of a sloping reservoir on the total injection amount is non‐monotonicity. For a fixed injection pressure, before the BTP, the greater the Dip Angle, the greater the CO 2 injection amount, but after the BTP, the change rule is reversed. (iii) The injection pressure significantly affected the total injected CO 2 amount, but the influence of the Dip Angle (in the range of 0° to 15°) on the total injection amount was not significant during injection. (iv) To a sloping reservoir, for long time injection (i.e., injection time is longer than the BTP), the bigger the Dip Angle, the greater the distance of the CO 2 upward migration, and the smaller the total injected amount compared to the horizontal reservoir. So, in actual site selection of a CCS project, the small Dip Angle reservoir was beneficial. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd.
Yang Peiju - One of the best experts on this subject based on the ideXlab platform.
-
support surrounding rock relationship and top coal movement laws in large Dip Angle fully mechanized caving face
International journal of mining science and technology, 2017Co-Authors: Hu Shaoxuan, Ma Liqiang, Guo Jinshuai, Yang PeijuAbstract:Abstract When mining the fully-mechanized longwall caving face along strike, the unstable equipment, the low top-coal recovery ratio and the difficulty in controlling surrounding rock may occur due to large Dip Angle. Considering the effects of strike Angle on support stability, the “support-surrounding rock” mechanical models of support topple and support slip were established in this paper. On the basis, the influencing factors of support stability were analyzed and the technical measures of controlling support and surrounding rock stability were put forward. Then the loose particles simulation experiment was conducted to analyze the impacts of caving directions and methods on the top-coal recovery in large Dip Angle fully-mechanized caving face. Finally, the “upward sequence and double-openings double-rounds” caving technology was determined. The research results are of great scientific significance and practical values to improve large Dip thick seam mining technology.