PSI - Issue 83

Iman Onsa et al. / Procedia Structural Integrity 83 (2026) 280–285

284

N), the wear reduction was found to be about 5 percent, as shown in Figure 3. These results indicate that the strength of the normal load is a more significant factor than speed for both determining the actual wear and the incremental value of upgrading casing grades. Practically speaking, the comparison results support the rationale that the decision to select the P110 casing grade over the L80 casing grade is most warranted in intervals where the casing experiences high side loads (e.g., high dogleg severity, long tangent sections, or poor centralization) since this will be where the contact stresses and wear driving forces will be the greatest.

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 Wear depth (mm)

0.741

0.703

0.625

0.39

L-80 P110

115rpm, 1400N

207rpm, 1000N

Figure 3: L-80 vs P110 grade steel wear depths at different conditions

5. Conclusions A finite-element model that uses Archard's wear law and an explicit contact approach was developed and verified for predicting casing wear. The rate of wear is determined primarily by the amount of lateral load and engine speed, with lateral load dominating in the envelope examined. The wear rates of P110 casing were improved when compared to L80 casing, the amount of improvement was highly dependent on the severity of the contact: up to ~35% reduced wear at a speed of 115 rpm (1400 N) and ~5% reduced wear at a speed of 207 rpm (1000 N). Therefore, as one would expect, the greatest amount of grade-upgrade improvement will occur during the interval of highest loads; thus, the finite-element model will help support the selection of casing grades for operational purposes to reduce wear on the casing. [1] N. Merah, R. Samuel, M. Alshalan, and A. Alshaarawi, “Casing Wear Tests for Precise Wear Factor Evaluation,” 2022. doi: 10.2118/208775-MS. [2] S. Alsaghir et al. , “Casing Wear Volume and Factor under Rotation and Sliding Motion,” Procedia Structural Integrity , vol. 47, no. 2022, pp. 437–447, 2023, doi: 10.1016/j.prostr.2023.07.081. [3] O. A. Osman, “Casing Wear Analysis in Directional Drilling,” no. December, 2022. [4] O. A. Osman et al. , “Wear factors and mechanisms of L-80 steel casings,” Engineering Research Express , vol. 5, 2023, [Online]. Available: https://api.semanticscholar.org/CorpusID:259258350 [5] J. Andersson, A. Almqvist, and R. Larsson, “Numerical simulation of a wear experiment,” Wear , vol. 271, no. 11–12, pp. 2947–2952, 2011, doi: 10.1016/j.wear.2011.06.018. [6] I. Hutchings and P. Shipway, Tribology: Friction and Wear of Engineering Materials . Butterworth-Heinemann, 2017. [Online]. Available: https://books.google.com.sa/books?id=yRR2DQAAQBAJ [7] O. A. Osman et al. , “Casing Wear and Wear Factors: New Experimental Study and Analysis.,” Materials (Basel) , vol. References