Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout
The drill string used in drilling is in a complex motion state downhole for several kilometers. The operating attitude and eccentricity of the downhole drill string play important roles in avoiding downhole risks and correcting the output of the imaging measurement sensor while drilling (IMWD). This...
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| Format: | Article |
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MDPI AG
2021-02-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/21/4/1258 |
| _version_ | 1827601200906764288 |
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| author | Hongqiang Li Ruihe Wang |
| author_facet | Hongqiang Li Ruihe Wang |
| author_sort | Hongqiang Li |
| collection | DOAJ |
| description | The drill string used in drilling is in a complex motion state downhole for several kilometers. The operating attitude and eccentricity of the downhole drill string play important roles in avoiding downhole risks and correcting the output of the imaging measurement sensor while drilling (IMWD). This paper proposes a method for measuring eccentricity while drilling using two sets of caliper sensors coupled with a fiber-optic gyroscope for continuous attitude measurement, which is used to solve the problem of the quantitative measurement of complex eccentricity that changes in real-time downhole. According to the measurement and calculation methods involved in this article, we performed simulations of the attitude of the drill string near where the IMWD tool is located in the wellbore under a variety of complex downhole conditions, such as centering, eccentricity, tilt, buckling, rotation, revolution, etc. The simulation and field test results prove that the distance between the imaging while drilling sensor and the borehole wall is greatly affected by the downhole attitude and revolution. The multi-sensor layout measurement scheme and the data processing based on the above-mentioned measurement involved can push the drill collar movement and eccentricity matrix specifically studied downhole from only qualitative estimation to real-time measurement and quantitative calculation. The above measurement and data processing methods can accurately measure and identify the local operating posture of the drill string where the IMWD sensor is located, and quantitatively give the eccentric distance matrix from the measuring point to the borehole wall required for environmental correction of the IMWD sensor. |
| first_indexed | 2024-03-09T04:50:56Z |
| format | Article |
| id | doaj.art-6382fdffa54c4b0fb5bc15d17b9f7971 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-09T04:50:56Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-6382fdffa54c4b0fb5bc15d17b9f79712023-12-03T13:10:51ZengMDPI AGSensors1424-82202021-02-01214125810.3390/s21041258Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor LayoutHongqiang Li0Ruihe Wang1School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, ChinaSchool of Petroleum Engineering, China University of Petroleum, Qingdao 266580, ChinaThe drill string used in drilling is in a complex motion state downhole for several kilometers. The operating attitude and eccentricity of the downhole drill string play important roles in avoiding downhole risks and correcting the output of the imaging measurement sensor while drilling (IMWD). This paper proposes a method for measuring eccentricity while drilling using two sets of caliper sensors coupled with a fiber-optic gyroscope for continuous attitude measurement, which is used to solve the problem of the quantitative measurement of complex eccentricity that changes in real-time downhole. According to the measurement and calculation methods involved in this article, we performed simulations of the attitude of the drill string near where the IMWD tool is located in the wellbore under a variety of complex downhole conditions, such as centering, eccentricity, tilt, buckling, rotation, revolution, etc. The simulation and field test results prove that the distance between the imaging while drilling sensor and the borehole wall is greatly affected by the downhole attitude and revolution. The multi-sensor layout measurement scheme and the data processing based on the above-mentioned measurement involved can push the drill collar movement and eccentricity matrix specifically studied downhole from only qualitative estimation to real-time measurement and quantitative calculation. The above measurement and data processing methods can accurately measure and identify the local operating posture of the drill string where the IMWD sensor is located, and quantitatively give the eccentric distance matrix from the measuring point to the borehole wall required for environmental correction of the IMWD sensor.https://www.mdpi.com/1424-8220/21/4/1258drill string eccentricitydrill string dynamicsultrasonic caliper while drillingfiber-optic gyrologging while drillingimaging measurement |
| spellingShingle | Hongqiang Li Ruihe Wang Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout Sensors drill string eccentricity drill string dynamics ultrasonic caliper while drilling fiber-optic gyro logging while drilling imaging measurement |
| title | Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout |
| title_full | Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout |
| title_fullStr | Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout |
| title_full_unstemmed | Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout |
| title_short | Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout |
| title_sort | research on a measurement method for downhole drill string eccentricity based on a multi sensor layout |
| topic | drill string eccentricity drill string dynamics ultrasonic caliper while drilling fiber-optic gyro logging while drilling imaging measurement |
| url | https://www.mdpi.com/1424-8220/21/4/1258 |
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