Throttle characteristics of multi-stage circumfluence nozzle during the separate-layer injection of CO_(2)

作     者：Haizhu Wang Gensheng Li Lichuan Zhao Youwen Wang Yun Liu Qingling Liu Meng Wang Fei Gao Meng Cai 

作者机构：State Key Laboratory of Petroleum Resources and ProspectingChina University of PetroleumBeijing 102200China Production Engineering&Research Institute of Daqing Oil Field Company LimitedDaqing 163453China 

出 版 物：《Petroleum》 (油气（英文）)

年 卷 期：2018年第4卷第2期

页      面：187-197页

学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Chinese National Programs for Fundamental Research and Development, (2014CB239203) Science Foundation of China University of Petroleum , Beijing, (2462015BJB01) National Natural Science Foundation of China, NSFC, (51521063, U1562212) National Natural Science Foundation of China, NSFC 

主　　题：Supercritical CO2 Separate-layer gas injection Multi-stage circumfluence nozzle Throttle characteristics Pressure difference 

摘      要：Separate-layer injection of CO2 is an important method to improve oil and gas production and *** single-stage nozzle is usually blocked by impurities,and the ice-barrier phenomenon is very *** solve this problem,large-diameter multi-stage circumfluence nozzle was designed to release pressure stage by *** order to illuminate the throttle characteristics of the CO2 multi-stage circumfluence nozzles,numerical simulation was performed to test several nozzles with different diameters and stage ***,we tested the throttle characteristics through laboratory experiments and obtained the effects of several critical parameters such as nozzle diameter,number of stage and pressure drop on the throttle *** results show that the flow rate decreases as the nozzle stage increases on the condition of constant pressure and nozzle *** pressure difference increases as nozzle stage number increases under the constant flow *** throttle capability of multi-stage circumfluence nozzles was much better than the concentric ***-diameter multi-stage nozzle is recommended rather than small-diameter single-stage nozzle during the process of separate-layer injection,which can efficiently prevent impurities and ice *** results are expected to provide a theoretical support for the nozzle choice of separate-layer injection of CO2.