固井用油井水泥颗粒干混特性的数值模拟  

Numerical Simulation of Dry Mixing Characteristics of Oil Well Cement Particles in Cementing Operations

作　　者：张宇凡 李卫东 滕霖 唐骏琪 陈曦 黄鑫 张翰卿 ZHANG Yu-fan;LI Wei-dong;TENG Lin;TANG Jun-qi;CHEN Xi;HUANG Xin;ZHANG Han-qing(College of Chemical Engineering,Fuzhou University,Fuzhou 350108,China;Qingyuan Innovation Laboratory,Quanzhou 362801,China;SINOPEC Gas Company Henan Gas Sales Center,Zhengzhou 450046,China;East China Branch,National Petroleum and Natural Gas Pipe Network Group Co.,Ltd.,Shanghai 200050,China)

机构地区：[1]福州大学石油化工学院,福州350108 [2]清源创新实验室,泉州362801 [3]中石化天然气分公司河南天然气销售中心,郑州450046 [4]国家石油天然气管网集团有限公司华东分公司,上海200050

出　　处：《科学技术与工程》2022年第28期12355-12361,共7页Science Technology and Engineering

基　　金：国家自然科学基金青年科学基金(52104066);福建省自然科学基金(2020J05097)。

摘　　要：在固井作业中,湿混方式混合时间长、原料浪费严重、环境污染大,因此气力干混技术日益得到重视。为探究干混时油井水泥与外掺料混合均匀程度的变化规律,确定最佳操作条件,利用FLUENT软件,采用欧拉-欧拉多相流模型对混拌罐内油井水泥颗粒和外掺料颗粒的混合过程进行数值模拟,分析了进气速度、进气口数量、物料装填顺序以及颗粒物性等因素对混合情况的影响。结果表明:气流速度较低时油井水泥与外掺料混合不均匀,气流速度过高则会出现颗粒局部集中;对本算例而言,气流为1 m/s时可获得较好的混合效果;增加进气口数量不能明显改善颗粒混合的均匀程度;初始装填时,密度最大的颗粒不应置于最底层;颗粒密度对混合情况有较大影响,而粒径的影响较小。In cementing operations,oil well cement needs to be mixed with admixtures to improve its performance.The early wet mixing method has shortages of long mixing duration,serious waste of raw materials and heavy environmental pollution,thus pneumatic dry mixing technology has drawn more attention recently.In order to investigate the variation law of mixing uniformity of oil well cement and admixture in dry mixing and determine the optimal operating condition.The mixing process of oil well cement particles and admixture particles in the mixing tank was numerically simulated by using FLUENT and Euler-Euler multiphase flow mode.The effects of inlet air velocity,air inlet number,materials loading sequence as well as particle properties on mixing were analyzed.The results show that when the air velocity is too low,oil well cement and admixture unevenly mix.On the contrary,when the air velocity is too large,there will be a concentrated distribution of the particles.For the given case,the optimal air velocity is 1 m/s.Moreover,increasing the number of air inlets can not significantly improve the uniformity of particle mixing.When loading the materials,particles with the highest density should not be placed at the bottom layer.The mixing performance is significantly affected by particle density,while particle size has no marked influence on mixing efficacy.

关 键 词：固井 油井水泥 颗粒物料 气力输送 干混 数值模拟 

分 类 号：TE256[石油与天然气工程—油气井工程]