超临界-密相CO2管输特性模拟计算研究  

Simulation and Calculation Study of Pipeline Transportation Characteristics for Super⁃critical-Dense Phase CO2

作　　者：盖晓鹏 李和清 路遥军 曹显林 刘勇[5] 张小芳 GAI Xiaopeng;LI Heqing;LU Yaojun;CAO Xianlin;LIU Yong;ZHANG Xiaofang(Technical Monitoring Center of Changqing Oilfield Company;Directional Well Drilling Company of Bohai Drilling Engineering Co.,Ltd.,CNPC;No.5 Oil Production Plant of Huabei Oilfield Company,CNPC;No.1 Oil Production Plant of Huabei Oilfield Company,CNPC;Oilfield Construction Management Center of No.1 Oil Production Plant of Huabei Oilfield Company,CNPC)

机构地区：[1]长庆油田分公司技术监测中心 [2]中国石油集团渤海钻探工程有限公司定向井技术服务分公司 [3]中国石油华北油田公司第五采油厂 [4]中国石油华北油田公司第一采油厂 [5]中国石油华北油田公司第一采油厂油田建设管理中心

出　　处：《油气田地面工程》2020年第11期22-27,共6页Oil-Gas Field Surface Engineering

摘　　要：目前,我国的超临界-密相CO2管道输送技术还处于起步阶段,缺乏理论依据和技术支撑。针对这一问题,以某油田特定的气源组分为例,采用PR状态方程,得到了含杂质的CO2相态图,相态图中出现了明显的气液两相区,临界点温度为30.76℃,压力为7.54 MPa。以100×10^4 t/a的输量为基础,针对不同管径条件下沿程压力、温度、密度的变化,选择DN300为超临界-密相输送的最佳管径,对不同入口压力、温度条件下的管输参数进行模拟。结果表明,高压状态下压降几乎不受温度影响,密度对压力和温度数据敏感,黏度对压力数据敏感。超临界-密相CO2在输送过程中,应避免进入准临界区和气液两相区,尽量保持高压运行。At present,the supercritical-dense phase CO2 pipeline transportation technology in China is still in its infancy,lacking theoretical basis and technical support.In order to solve this problem,and taking a specific gas source group of an oilfield as an example,the phase diagram of CO2 containing impurities is obtained using the PR equation of state.In the phase diagram,an obvious gas-liquid twophase region appeared.The critical point temperature is 30.76℃,and the pressure is 7.54 MPa.Then based on the throughout of 100×10^4 t/a,DN300 is selected as the optimal pipe diameter for supercritical-dense phase transportation under different pipe diameters,aiming at the changes of pressure,temperature,and density along the pipe,and the pipe transport parameters under different inlet pressure and temperature conditions are simulated.The results show that the pressure drop under high pressure is almost independent of temperature,density is sensitive to pressure and temperature data,and viscosity is sensitive to pressure data.In the process of supercritical-dense CO2 phase transportation process,it is necessary to avoid the appearance of the quasi-critical area and to maintain high pressure operation as far as possible.

关 键 词：管输CO2 超临界-密相 密度 黏度 临界温度 临界压力 

分 类 号：TQ022.115[化学工程]