NON-LINEAR STRESS ANALYSIS AND GEOMETRY IMPROVEMENT OF PACKERS’ LOCK RINGS
Keywords:
Packers, Oil Exploration, Stress Analysis, Buttress Threads, Non-Linear Finite Element AnalysisAbstract
The petroleum industry uses a variety of exploration equipment and efforts are constantly made to increase their efficiency and reliability. Packer is one of these equipment, being mounted inside an oil completion well with the main function to isolate pressure between the production casing and the installed tubing (where oil flows). Some packers have an anchoring device to avoid axial displacement in relation to the production casing. The anchor principle is based on friction forces generated by pushing slips against the casing, through mechanical or hydraulic forces. Once constant application of forces is not practical in most situations, a lock ring is normally used to avoid the slips returning to the initial position. The lock ring is basically a circular section with an open segment and the internal face of the ring is designed with buttress threads (ASME B1.9), this geometry allows displacement in only one direction due to ring’s diameter deformation. Lock ring failure can compromise the completion operation or damage the packer, preventing further utilization. The purpose of this work is to evaluate some geometry modifications to the buttress threads to reduce stress acting on the lock ring. The study will be carried using non-linear finite element analysis.
References
Souza Neto, N. J. Análise não-linear de tensões do anel trava de um obturador e melhoria de sua geometria de rosca, Trabalho de Conclusão de Curso (Engenharia Mecânica), Escola Politécnica, UFBA, 2021, 77p.
Gaudarde, G. Operadoras estimam aportes de R$ 5,4 bi em exploração para 2021. EPBR, 12 de jan. de 2021. Disponível em: < https://epbr.com.br/operadoras-estimam-aportes-de-r-54-bi-em-exploracao-para-2021/>. Acesso em: 20 de abr. de 2021.
NORSOK Standards. NORSOK D-010: Well integrity in drilling and well operations. Noruega, 2004, 158 p.
Bellarby, J. Well Completion Design. 1st ed. Developments in Petroleum Science, Vol. 56, Amsterdam: Elsevier Science, 2009. 726 p.
Vignes, B.; Aadnoy, B. S. Well-integrity issues offshore norway. SPE/IADC Drilling Conference. Orlando, 2008, 4-6 March.
Patel, H.; Salehi, S.; Ahmed, R.; Teodoriu, C. Review of elastomer seal assemblies in oil & gas wells: Performance evaluation, failure mechanisms, and gaps in industry standards. Journal of Petroleum Science and Engineering, v.179, pp. 1046-1062, 2019.
Zhang, H. et al. Simulation analysis of mechanical properties of key seating and bearing components of multistage water injection packer. IOP Conference Series: Earth and Environmental Science 859, 012014, 2021.
Tang, Y.; Sun, P.; Wang, G.; Li, W. Analysis of pressure-bearing performance and optimization of structural parameters of the slip in a compression packer. Science Progress, 2019, 19p.
American Society of Mechanical Engineers. ASME B1.9-1973: Buttress Inch Screw Threads 7 deg. /45 deg. Form with 0.6 Pitch Basic Height of Thread Engagement, 1973. 36 p.
Shigley, J. E.; Mischke, C. R. Standard Handbook of Machine Design. 2nd ed. New York: McGraw-Hill, 1996. 1716 p.
López-Campos, J.A. et. al. Finite Element Study of a Threaded Fastening: The Case of Surgical Screws in Bone. Symmetry, Vol. 10, No. 8, Agosto, 2018.
Downloads
Published
Issue
Section
License
Copyright (c) 2023 Revista Interdisciplinar de Pesquisa em Engenharia
This work is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.
Given the public access policy of the journal, the use of the published texts is free, with the obligation of recognizing the original authorship and the first publication in this journal. The authors of the published contributions are entirely and exclusively responsible for their contents.
1. The authors authorize the publication of the article in this journal.
2. The authors guarantee that the contribution is original, and take full responsibility for its content in case of impugnation by third parties.
3. The authors guarantee that the contribution is not under evaluation in another journal.
4. The authors keep the copyright and convey to the journal the right of first publication, the work being licensed under a Creative Commons Attribution License-BY.
5. The authors are allowed and stimulated to publicize and distribute their work on-line after the publication in the journal.
6. The authors of the approved works authorize the journal to distribute their content, after publication, for reproduction in content indexes, virtual libraries and similars.
7. The editors reserve the right to make adjustments to the text and to adequate the article to the editorial rules of the journal.
