中南大学学报（自然科学版）2023，Vol.54Issue(11)：4413-4423,11.DOI:10.11817/j.issn.1672-7207.2023.11.019
基于欧拉双流体模型的微小井眼环空岩屑运移数值模拟研究
Numerical simulation research of cuttings transport in microhole annulus based on Eulerian two-fluid model
摘要
Abstract
In order to investigate the cuttings transport law in the microhole annulus,a solid-liquid two-phase flow model of the borehole annulus was developed based on the Eulerian two-fluid model using computational fluid dynamics(CFD)numerical simulation method.Firstly,the influences of cuttings characteristics,operating parameters and wellbore condition changes on cuttings transport law were studied,and then the beneficial effect of drill pipe oscillation frequency and oscillation amplitude on cuttings transport was analyzed.The results show that as other conditions remain unchanged,increasing the initial velocity of the liquid phase in the annulus can increase the force of the fluid on the particles and thus improve the cuttings-carrying efficiency during the process of cuttings transport.Under microhole drilling conditions,the gravity of individual cuttings particles and the energy loss synergistically affect the cuttings transport process due to particle collision,and the cuttings with 1.5 mm diameter are the most difficult to be transported out of the annulus.Although increasing the rate of penetration(ROP)can increase the initial velocity of cuttings,it also increases the accumulation of cuttings in the annulus.With the increase of eccentricity,the proportion of stationary bed of cuttings increases and the transport efficiency significantly decreases.The cuttings-carrying efficiency of the inclined section is significantly lower than that of the horizontal and vertical sections,and the volume fraction of cuttings in the pipe reaches its highest value at the inclination angle of 60°.Compared with the no-oscillation condition,the oscillation of the drill pipe can disturb the cuttings near the drill pipe and reduce the height of the cuttings bed.When the velocity of the liquid phase is 1 m/s,the best cuttings-carrying efficiency of drilling fluid is achieved with an oscillation frequency of 15 Hz and an oscillation amplitude of 9 mm.关键词
微小井眼/CFD数值模拟/水平井/固液两相流/岩屑运移Key words
microhole/CFD numerical simulation/horizontal well/solid-liquid two-phase flow/cuttings transport分类
能源科技引用本文复制引用
张鑫鑫,毛纯芝,信伟卫,张绍和,吴冬宇,贺勇..基于欧拉双流体模型的微小井眼环空岩屑运移数值模拟研究[J].中南大学学报（自然科学版）,2023,54(11):4413-4423,11.基金项目
中南大学创新驱动项目(2023CXQD044) （2023CXQD044）
中南大学中央高校基本业务费专项资金资助项目(2022ZZTS0502) （2022ZZTS0502）
国家自然科学基金资助项目(42302354) （42302354）
湖南省自然科学基金资助项目(2023JJ30664)(Project(2023CXQD044)supported by Innovation Drive Program of Central South University （2023JJ30664）
Project(2022ZZTS0502)supported by the Fundamental Research Funds for the Central Universities of Central South University （2022ZZTS0502）
Project(42302354)supported by the National Natural Science Foundation of China （42302354）
Project(2023JJ30664)supported by the Natural Science Foundation of Hunan Province) （2023JJ30664）
