The purpose of this paper is based on the response surface method, the authors determined the conditions for achieving the optimum rubber-sealing performance by using the maximum contact stress as the response value.
A two-dimensional model of a compression packer rubber was established by finite-element analysis software. Under the single axial load of 53.85 MPa, the four single factors of the end-face inclination angle, subthickness, height of rubber and friction coefficient of the rubber were analyzed.
Results show that the optimum sealing performance of the rubber tube is achieved when the end-face angle is equal to 45º and the thickness of the rubber tube is 9 mm. The response surface designed by Box–Behnken shows that the sealing performance of the rubber tube is the optimum when the end-face inclination angle is 48.1818°, the subthickness is 9 mm, the height of rubber is 90 mm and the friction coefficient is 0.1. Verification test results show that the model is reliable and effective.
Packer operations are performed downhole, and research on real experiments is limited. In this work, the feasibility of such experiments is determined by comparing finite-element modeling with actual experiments, and the results have guiding significance for actual downhole operations.
The authors gratefully acknowledge the financial support of the Natural Science Foundation of Tianjin (Grant No. 17JCZDJC38800). The authors express their appreciation for the comments of the anonymous reviewers and editors.
Zhang, F., Shui, H.C. and Zhang, Y. (2019), "Parameter optimization of sealing performance for packer rubber", Industrial Lubrication and Tribology, Vol. 71 No. 5, pp. 664-671. https://doi.org/10.1108/ILT-01-2019-0017Download as .RIS
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