可变径刮管器结构设计及测试

Structure Design and Test of Variable Diameter Scraper

针对目前海上油田刮管器不同尺寸套管无法通用、工作效率差的现状,研究设计了适用于159.4~220.5 mm(7"~9(5/8)")内径套管的可变直径刮管器。该工具设计了一个弓形的板簧,使其可以适用不同直径的套管。通过对弓形板簧结构的工作状态及支反力进行理论计算和仿真计算分析,得出该板簧表面的最大等效应力及支反力随压缩程度的线性变化规律。实验测试发现:板簧的支反力随压缩距离线性增加,当压缩达到50 mm时,板簧的支反力为1 250 N。数值模拟结果、理论分析计算结果与实验测试结果分别相差9.36%和3.2%。实验和现场应用表明,可变径刮管器使用效果良好,研究结果有利于新型变径刮管器的设计和研究。

In view of the current situation that different sizes of casing scraper in offshore oil field can not be used in general and the working efficiency is low, a variable diameter scraper suitable for inner diameter casing of 159.4 ~220.5 mm(7"~9(5/8)") is studied and designed. The tool has an arched leaf spring, which can make it suitable for casing with different diameters. Through the theoretical calculation and simulation calculation of the working state and supporting reaction force of the arched leaf spring mechanism, it is obtained that the maximum equivalent stress and supporting reaction force on the surface of the leaf spring change linearly with the amount of compression. The experimental test shows that the supporting reaction force of the leaf spring increases linearly with the increase of compression distance. When the compression amount reaches 50 mm, the supporting reaction force of the leaf spring is 1 250N. The experimental result, numerical simulation and theoretical analysis result are compared, and the differences between numerical simulation result, the oratical analysis result and experiment result are 9.36% and 3.20% respectively. The experiment and field application show that the variable diameter scraper has good application effect. The research results are beneficial to the design and research of the new variable diameter scraper.