Multiphase mixture model to predict temperature drop in highly choked conditions in CO2 enhanced oil recovery
Multiphase mixture model to predict temperature drop in highly choked conditions in CO2 enhanced oil recovery
复制标题
多相混合物模型可预测 CO2 强化采油中高度阻塞条件下的温降
DOI：
10.1016/j.applthermaleng.2016.07.156
复制
发表时间：
2016-09-05
影响因子：
6.4
通讯作者：
Teng, Wenchao
中科院分区：
文献类型：
--
作者：
Teng, Lin;Zhang, Datong;Teng, Wenchao
CO2强化采油（CO2-EOR）技术是一种既能抑制全球变暖，又能降低二氧化碳捕集、封存（CCS）成本的技术。众所周知，当多相混合物流过井口节流器时，会发生焦耳-汤姆逊冷却（JTC）。为预测高CO2含量多相混合物通过节流阀时的温降，在等焓模型、气液溶解度平衡模型和气液热平衡模型的基础上，建立了一种新的多相节流流模型。同时，对多相阻流的流动特性进行了验证性实验研究。计算结果表明，模型预测值与实验数据和HYTRESS模拟结果吻合较好。结果表明，节流阀压降、气体组分、气液比等对JTC均有影响。CH 4、N-2和H-2对JTC的正贡献逐渐减小，高摩尔分数的CO2可以提高JTC。研究表明，低的GLR、低的压降和高的上游温度可以防止下游管道的冻结和堵塞。(C)2016爱思唯尔有限公司版权所有
CO2 enhanced oil recovery (CO2-EOR) technique is one potential option that can not only limit global warming, but also cut the high cost of Carbon dioxide Capture, Storage (CCS). It is well known that Joule-Thomson cooling (JTC) can occur when multiphase mixtures flow through wellhead chokes. To predict the temperature drop for multiphase mixtures with high CO2 content through choke valves, a new multiphase choked flow model was developed, which was based on the isenthalpic model, gas-liquid solubility equilibrium model and gas-liquid thermal equilibrium model. At the same time, a verification experiment was carried out to study on the flow characteristics in multiphase choked flow. The results also showed that the model predictions were in good agreement with the experiment data and HYSYS simulation results. It was found that choke valve pressure drop, gas components and gas-liquid ratio had impacts on the JTC. The positive contributions to JTC for CH4, N-2 and H-2 were decreasing gradually and high mole fraction of CO2 can enhance JTC. Based on this study, low GLR, low pressure drop and high upstream temperature can prevent freeze and block of the pipeline downstream. (C) 2016 Elsevier Ltd. All rights reserved.