蜡沉积物旋转切削模型及试验研究

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中图分类号：TE832文献标识码：A DOI：10.12473/CPM.202408062

Abstract： Inteligent wax removal pig can strip wax deposition layer inside oil pipeline using its front rotary tool bit，and can improve pigging ffciencyand avoid pigging wax plugging bycooperating with jet and governor mechanisms.To solve the problem of wax removal resistance calculation in rotary cuting of wax depositionlayer，a rotary cuting model of wax deposits wasbuilt.Then，rotary cuttng tests were conducted to measure the main cutting force under diffrent cutting depths，feed rates，tool speedsand tool rake angles，and the test results were used to conduct regression analysis on the shear angle and friction angle of wax layer.Finally，a rotary cutting semi-empirical model of wax deposition layer was built to optimizethe toolrake angle，and the wax removal resistanceof rotary cuting mode was compared with the wax removal resistance test data of straight plate pig and cup pig inthe literatures.The studyresults show that in the course of rotary wax removal，the main cutting force for wax removal oftol increases with the increase of cuting depth and feedrate，and has alinearrelationship with cutting depth.The main cutting force decreases with the increase of cutting speed;when the cutting speed reaches more than 3m/s ，the main cuting force of wax removal is basically unchanged. The error between the established rotary cutting theoretical model and the test is about 10% ，exhibiting good calculation accuracy. The optimal tool rake angle in the process of rotary wax removal is 46.6∘ . Under the rotary cutting condition of wax layer，the axial wax removal resistance is 30% 1 50% smaller than that of the traditional pig，effectively reducing the influence of the wax removal processon the running speed of the pig.The study results provide references for wax removal of oilfield pipelines.

Keywords： intellgent wax removal pig；rotary cutting；semi-empirical model;tool rake angle；wax remova resistance;wax deposition layer

0 前言

在原油管道输送过程中，原油中的蜡晶分子受到分子扩散、剪切弥散、布朗扩散和重力沉降等多种机制协同作用，使蜡晶分子在管内壁附着沉积，形成蜡沉积层[1]。（剩余12715字）