Simulation Analysis of Gas Bubble Formation and Escape in Non-Newtonian Drilling Fluids
In this study, the formation and escape movements of a bubble injected in non-Newtonian drilling fluid through a pore were numerically simulated using a volume of fluid method. The pattern of a single bubble and the pressure and velocity fields of the surrounding liquid phase during the bubble forma...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2021/6680653 |
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| _version_ | 1832550588029599744 |
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| author | Xinxin Zhao Xiangzhen Yan Hongwei Jiang Guang Yang Jintang Wang Xiaohui Sun Yonghai Gao Faling Yin |
| author_facet | Xinxin Zhao Xiangzhen Yan Hongwei Jiang Guang Yang Jintang Wang Xiaohui Sun Yonghai Gao Faling Yin |
| author_sort | Xinxin Zhao |
| collection | DOAJ |
| description | In this study, the formation and escape movements of a bubble injected in non-Newtonian drilling fluid through a pore were numerically simulated using a volume of fluid method. The pattern of a single bubble and the pressure and velocity fields of the surrounding liquid phase during the bubble formation were analyzed and compared with experimental results; based on the comparison, the formation and escape properties of the bubble were further studied. In particular, the effects of static shear force, consistency coefficient, and flow behavior index on the growth and escape time of the bubble were analyzed. The results show that, owing to the effect of velocity on the viscosity of a non-Newtonian drilling fluid, the escape time and volume of the bubble increase with an increase in static shear force, consistency coefficient, and flow behavior index. Among the three parameters, the flow behavior index has the greatest effect. This is because the shear disturbance of a bubble to its surrounding fluid during its growth and escape, caused by the shear thinning of a yield-power-law fluid, reduces the fluid viscosity. The shear thinning decreases, and the resistance to the bubble increases as the flow behavior index approaches 1, leading to larger bubble formation times and separation volumes. An empirical formula for predicting the equivalent radius of bubbles considering the liquid yield stress, inertial force, viscous force, and surface tension is established. The average error of predicting the equivalent radius of detached bubble is 0.80%, which can provide a reference for the better study of bubble migration and flow pattern in non-Newtonian fluid. |
| format | Article |
| id | doaj-art-bb77845c814d4228811aaa2f7ff96d08 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-bb77845c814d4228811aaa2f7ff96d082025-02-03T06:06:29ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/66806536680653Simulation Analysis of Gas Bubble Formation and Escape in Non-Newtonian Drilling FluidsXinxin Zhao0Xiangzhen Yan1Hongwei Jiang2Guang Yang3Jintang Wang4Xiaohui Sun5Yonghai Gao6Faling Yin7Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, ChinaKey Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, ChinaCNPC Engineering Technology R & D Company Limited, Beijing 102206, ChinaCNPC Engineering Technology R & D Company Limited, Beijing 102206, ChinaKey Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, ChinaKey Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, ChinaKey Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, ChinaKey Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, ChinaIn this study, the formation and escape movements of a bubble injected in non-Newtonian drilling fluid through a pore were numerically simulated using a volume of fluid method. The pattern of a single bubble and the pressure and velocity fields of the surrounding liquid phase during the bubble formation were analyzed and compared with experimental results; based on the comparison, the formation and escape properties of the bubble were further studied. In particular, the effects of static shear force, consistency coefficient, and flow behavior index on the growth and escape time of the bubble were analyzed. The results show that, owing to the effect of velocity on the viscosity of a non-Newtonian drilling fluid, the escape time and volume of the bubble increase with an increase in static shear force, consistency coefficient, and flow behavior index. Among the three parameters, the flow behavior index has the greatest effect. This is because the shear disturbance of a bubble to its surrounding fluid during its growth and escape, caused by the shear thinning of a yield-power-law fluid, reduces the fluid viscosity. The shear thinning decreases, and the resistance to the bubble increases as the flow behavior index approaches 1, leading to larger bubble formation times and separation volumes. An empirical formula for predicting the equivalent radius of bubbles considering the liquid yield stress, inertial force, viscous force, and surface tension is established. The average error of predicting the equivalent radius of detached bubble is 0.80%, which can provide a reference for the better study of bubble migration and flow pattern in non-Newtonian fluid.http://dx.doi.org/10.1155/2021/6680653 |
| spellingShingle | Xinxin Zhao Xiangzhen Yan Hongwei Jiang Guang Yang Jintang Wang Xiaohui Sun Yonghai Gao Faling Yin Simulation Analysis of Gas Bubble Formation and Escape in Non-Newtonian Drilling Fluids Geofluids |
| title | Simulation Analysis of Gas Bubble Formation and Escape in Non-Newtonian Drilling Fluids |
| title_full | Simulation Analysis of Gas Bubble Formation and Escape in Non-Newtonian Drilling Fluids |
| title_fullStr | Simulation Analysis of Gas Bubble Formation and Escape in Non-Newtonian Drilling Fluids |
| title_full_unstemmed | Simulation Analysis of Gas Bubble Formation and Escape in Non-Newtonian Drilling Fluids |
| title_short | Simulation Analysis of Gas Bubble Formation and Escape in Non-Newtonian Drilling Fluids |
| title_sort | simulation analysis of gas bubble formation and escape in non newtonian drilling fluids |
| url | http://dx.doi.org/10.1155/2021/6680653 |
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