Identification and control of stick–slip vibrations using Kalman estimator in oil-well drill strings
Excessive stick–slip vibrations of drill strings can cause premature component failures and inefficient drilling operations. Previous research works employ real-time measurements of all states of the drill string as feedback to the controllers to suppress such vibrations. While real-time measurement...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2017
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| Online Access: | https://hdl.handle.net/10356/83749 http://hdl.handle.net/10220/42787 |
| _version_ | 1824454085025202176 |
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| author | Hong, Liu Girsang, Irving P. Dhupia, Jaspreet S. |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Hong, Liu Girsang, Irving P. Dhupia, Jaspreet S. |
| author_sort | Hong, Liu |
| collection | NTU |
| description | Excessive stick–slip vibrations of drill strings can cause premature component failures and inefficient drilling operations. Previous research works employ real-time measurements of all states of the drill string as feedback to the controllers to suppress such vibrations. While real-time measurements are readily available for components at the surface, only limited measurements are practically available for the downhole states. To address the requirement for downhole states, this paper proposes the utilization of Kalman estimator to estimate the downhole drill bit position and velocity based on the measurements at the surface. In the design of the estimator, the nonlinear downhole friction torque is approximated by a linear persistent disturbance model. A linear–quadratic–Gaussian (LQG) control strategy is then applied on the estimated states to mitigate the unwanted vibrations. Performance of this control scheme is investigated through numerical simulations where the dynamics of the drill string is modeled using a high fidelity lumped parameter model considering torsional stick–slip and lateral motions as well as a nonlinear friction model. The dynamic response from the high-fidelity model is demonstrated to have a close qualitative agreement with the stick–slip vibrations observed in field. The simulated results demonstrate the capability of the proposed Kalman estimator in identifying the stick–slip vibrations and estimating the downhole friction torque. The effectiveness of the proposed controller in avoiding such vibrations is also verified. |
| first_indexed | 2025-02-19T03:16:42Z |
| format | Journal Article |
| id | ntu-10356/83749 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:16:42Z |
| publishDate | 2017 |
| record_format | dspace |
| spelling | ntu-10356/837492023-03-04T17:17:33Z Identification and control of stick–slip vibrations using Kalman estimator in oil-well drill strings Hong, Liu Girsang, Irving P. Dhupia, Jaspreet S. School of Mechanical and Aerospace Engineering Drilling Vibrations Excessive stick–slip vibrations of drill strings can cause premature component failures and inefficient drilling operations. Previous research works employ real-time measurements of all states of the drill string as feedback to the controllers to suppress such vibrations. While real-time measurements are readily available for components at the surface, only limited measurements are practically available for the downhole states. To address the requirement for downhole states, this paper proposes the utilization of Kalman estimator to estimate the downhole drill bit position and velocity based on the measurements at the surface. In the design of the estimator, the nonlinear downhole friction torque is approximated by a linear persistent disturbance model. A linear–quadratic–Gaussian (LQG) control strategy is then applied on the estimated states to mitigate the unwanted vibrations. Performance of this control scheme is investigated through numerical simulations where the dynamics of the drill string is modeled using a high fidelity lumped parameter model considering torsional stick–slip and lateral motions as well as a nonlinear friction model. The dynamic response from the high-fidelity model is demonstrated to have a close qualitative agreement with the stick–slip vibrations observed in field. The simulated results demonstrate the capability of the proposed Kalman estimator in identifying the stick–slip vibrations and estimating the downhole friction torque. The effectiveness of the proposed controller in avoiding such vibrations is also verified. Accepted version 2017-07-03T09:21:01Z 2019-12-06T15:31:14Z 2017-07-03T09:21:01Z 2019-12-06T15:31:14Z 2016 Journal Article Hong, L., Girsang, I. P., & Dhupia, J. S. (2016). Identification and control of stick–slip vibrations using Kalman estimator in oil-well drill strings. Journal of Petroleum Science and Engineering, 140, 119-127. 0920-4105 https://hdl.handle.net/10356/83749 http://hdl.handle.net/10220/42787 10.1016/j.petrol.2016.01.017 en Journal of Petroleum Science and Engineering © 2016 Elsevier B.V. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Petroleum Science and Engineering, Elsevier B.V. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.petrol.2016.01.017]. 22 p. application/pdf |
| spellingShingle | Drilling Vibrations Hong, Liu Girsang, Irving P. Dhupia, Jaspreet S. Identification and control of stick–slip vibrations using Kalman estimator in oil-well drill strings |
| title | Identification and control of stick–slip vibrations using Kalman estimator in oil-well drill strings |
| title_full | Identification and control of stick–slip vibrations using Kalman estimator in oil-well drill strings |
| title_fullStr | Identification and control of stick–slip vibrations using Kalman estimator in oil-well drill strings |
| title_full_unstemmed | Identification and control of stick–slip vibrations using Kalman estimator in oil-well drill strings |
| title_short | Identification and control of stick–slip vibrations using Kalman estimator in oil-well drill strings |
| title_sort | identification and control of stick slip vibrations using kalman estimator in oil well drill strings |
| topic | Drilling Vibrations |
| url | https://hdl.handle.net/10356/83749 http://hdl.handle.net/10220/42787 |
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