Propagation characteristics of Doppler ultrasonic wave in gas–liquid two-phase flow in an offshore deepwater riser
During offshore deepwater drilling, the strata with abnormal pressure are often encountered and gas invasion and overflow occur easily. If they cannot be detected and controlled in time, blowout may happen and even get out of control, which will cause considerable economic loss and irreparable casua...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
KeAi Communications Co., Ltd.
2021-12-01
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| Series: | Natural Gas Industry B |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352854021000978 |
| _version_ | 1797282640043180032 |
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| author | Chunwei Gu Qian Li Rui Ma Yingsong Lin Xiangfang Li Yiming Li Aixia Zhang Yingjie Li Bangtang Yin |
| author_facet | Chunwei Gu Qian Li Rui Ma Yingsong Lin Xiangfang Li Yiming Li Aixia Zhang Yingjie Li Bangtang Yin |
| author_sort | Chunwei Gu |
| collection | DOAJ |
| description | During offshore deepwater drilling, the strata with abnormal pressure are often encountered and gas invasion and overflow occur easily. If they cannot be detected and controlled in time, blowout may happen and even get out of control, which will cause considerable economic loss and irreparable casualties and may even damage the marine ecologic environment seriously. How to monitor overflow early during deepwater drilling is a global research hot, focus and difficulty at present. In order to provide theoretical guidance for the early monitoring of overflow in the riser during offshore deepwater drilling, this paper designed an experimental device for the early monitoring of gas invasion based on the propagation principle of Doppler ultrasonic wave. Then, the installation mode and angle of Doppler probe were optimized. Finally, the propagation of Doppler ultrasonic wave in the gas–liquid two-phase flow with a void fraction of 0–46% and a liquid flow velocity of 0–0.7 m/s was experimentally studied, and the change laws of Doppler ultrasonic wave with void fraction were revealed. And the following research results are obtained. First, when the void fraction changes, the signal voltage will jump up and down at different amplitudes and frequencies on the basis of initial curve. The signal voltage amplitude increases firstly and then decreases with the increase of void fraction. Second, when the increase amplitude of mean signal voltage caused by multiple reflection is greater than the attenuation degree of ultrasonic wave, the mean signal voltage increases. Otherwise, the signal voltage decreases. Third, the fitting curve of mean signal voltage scatters and void fraction under different flow velocities and void fractions during pump stopping and starting present a change law of quadratic function. In conclusion, void fraction can be quantitatively predicted based on the measured signal voltage, so as to provide guidance for the early monitoring of riser overflow and well kill operation during offshore deepwater drilling. |
| first_indexed | 2024-03-07T17:16:00Z |
| format | Article |
| id | doaj.art-a2f8b2a66b5045cfa4e441c69b5de5a6 |
| institution | Directory Open Access Journal |
| issn | 2352-8540 |
| language | English |
| last_indexed | 2024-03-07T17:16:00Z |
| publishDate | 2021-12-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Natural Gas Industry B |
| spelling | doaj.art-a2f8b2a66b5045cfa4e441c69b5de5a62024-03-02T22:21:28ZengKeAi Communications Co., Ltd.Natural Gas Industry B2352-85402021-12-0186615621Propagation characteristics of Doppler ultrasonic wave in gas–liquid two-phase flow in an offshore deepwater riserChunwei Gu0Qian Li1Rui Ma2Yingsong Lin3Xiangfang Li4Yiming Li5Aixia Zhang6Yingjie Li7Bangtang Yin8CNOOC China Limited, Beijing 100010, ChinaExploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610041, China; Corresponding author.School of Petroleum Engineering, China University of Petroleum - East China, Qingdao, Shandong 266580, ChinaSchool of Petroleum Engineering, China University of Petroleum - East China, Qingdao, Shandong 266580, ChinaCollege of Petroleum Engineering, China University of Petroleum, Beijing 102249, ChinaCollege of Petroleum Engineering, China University of Petroleum, Beijing 102249, ChinaCNPC Offshore Engineering Co., Ltd., Beijing 100028, ChinaCNPC Offshore Engineering Co., Ltd., Beijing 100028, ChinaSchool of Petroleum Engineering, China University of Petroleum - East China, Qingdao, Shandong 266580, ChinaDuring offshore deepwater drilling, the strata with abnormal pressure are often encountered and gas invasion and overflow occur easily. If they cannot be detected and controlled in time, blowout may happen and even get out of control, which will cause considerable economic loss and irreparable casualties and may even damage the marine ecologic environment seriously. How to monitor overflow early during deepwater drilling is a global research hot, focus and difficulty at present. In order to provide theoretical guidance for the early monitoring of overflow in the riser during offshore deepwater drilling, this paper designed an experimental device for the early monitoring of gas invasion based on the propagation principle of Doppler ultrasonic wave. Then, the installation mode and angle of Doppler probe were optimized. Finally, the propagation of Doppler ultrasonic wave in the gas–liquid two-phase flow with a void fraction of 0–46% and a liquid flow velocity of 0–0.7 m/s was experimentally studied, and the change laws of Doppler ultrasonic wave with void fraction were revealed. And the following research results are obtained. First, when the void fraction changes, the signal voltage will jump up and down at different amplitudes and frequencies on the basis of initial curve. The signal voltage amplitude increases firstly and then decreases with the increase of void fraction. Second, when the increase amplitude of mean signal voltage caused by multiple reflection is greater than the attenuation degree of ultrasonic wave, the mean signal voltage increases. Otherwise, the signal voltage decreases. Third, the fitting curve of mean signal voltage scatters and void fraction under different flow velocities and void fractions during pump stopping and starting present a change law of quadratic function. In conclusion, void fraction can be quantitatively predicted based on the measured signal voltage, so as to provide guidance for the early monitoring of riser overflow and well kill operation during offshore deepwater drilling.http://www.sciencedirect.com/science/article/pii/S2352854021000978Offshore deepwater drillingGas invasion and overflow of riserEarly monitoringDoppler ultrasonic waveGas-liquid two phase flowVoid fraction |
| spellingShingle | Chunwei Gu Qian Li Rui Ma Yingsong Lin Xiangfang Li Yiming Li Aixia Zhang Yingjie Li Bangtang Yin Propagation characteristics of Doppler ultrasonic wave in gas–liquid two-phase flow in an offshore deepwater riser Natural Gas Industry B Offshore deepwater drilling Gas invasion and overflow of riser Early monitoring Doppler ultrasonic wave Gas-liquid two phase flow Void fraction |
| title | Propagation characteristics of Doppler ultrasonic wave in gas–liquid two-phase flow in an offshore deepwater riser |
| title_full | Propagation characteristics of Doppler ultrasonic wave in gas–liquid two-phase flow in an offshore deepwater riser |
| title_fullStr | Propagation characteristics of Doppler ultrasonic wave in gas–liquid two-phase flow in an offshore deepwater riser |
| title_full_unstemmed | Propagation characteristics of Doppler ultrasonic wave in gas–liquid two-phase flow in an offshore deepwater riser |
| title_short | Propagation characteristics of Doppler ultrasonic wave in gas–liquid two-phase flow in an offshore deepwater riser |
| title_sort | propagation characteristics of doppler ultrasonic wave in gas liquid two phase flow in an offshore deepwater riser |
| topic | Offshore deepwater drilling Gas invasion and overflow of riser Early monitoring Doppler ultrasonic wave Gas-liquid two phase flow Void fraction |
| url | http://www.sciencedirect.com/science/article/pii/S2352854021000978 |
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