TITLE:
Study on Structural Parameter Optimization of a Spring-Loaded Casing Scraper
AUTHORS:
Song Zeng, Chaoyang Yu, Geng Peng, Zheng Li
KEYWORDS:
Casing Scraper, Scraping Performance, Numerical Simulation, Orthogonal Optimization
JOURNAL NAME:
World Journal of Engineering and Technology,
Vol.14 No.4,
November
3,
2026
ABSTRACT: When cement attachments on the casing inner wall are removed, thick continuous cement rings can sharply increase scraping resistance and cumulative work, and may even suspend the operation. To address this problem, a 7-inch spring-loaded casing scraper was studied through blade spring compression tests, casing obstacle-removal bench tests, and finite element orthogonal design. The equivalent stiffness of the spring assembly on a single blade was first measured. The axial load and removal ratio of the scraper were then compared among burrs, discrete cement blocks with three spacings, and continuous cement rings with three thicknesses. For 25 structural parameter combinations, the average scraping force, material failure volume, and scraping work were analyzed, and the schemes were screened by range analysis and equal-weight comprehensive scoring. The results show that the equivalent stiffness of the spring assembly is about 120.9 N/mm. When the cement block spacing increases from 100 mm to 200 mm, the cumulative scraping work decreases by 52.48%. When the continuous cement ring thickness increases from 6 mm to 8 mm, the cumulative scraping work increases by 36.74%; under the 10 mm condition, the peak load reaches 180 kN and the operation is suspended. The orthogonal results show that the blade body length dominates the average scraping force and scraping work, while the cutter wing height dominates the failure volume. Among the 25 schemes, T20 ranks first with a comprehensive score of 0.9492. This study provides a quantitative basis for optimizing scraper blade parameters.