涡流排水采气技术数值模拟研究　　

Numerical simulation research on eddy current drainage gas recovery technology

李隽 李楠 李佳宜 王云 曹光强

LI Jun LI Nan LI Jiayi WANG Yun CAO Guangqiang

中国地质大学北京能源学院，北京　100083 中国石油勘探开发研究院采油所，北京　100083 中国石油安全环保技术研究院，北京　100083

School of Energy Resources, China University of GeosciencesBeijing, Beijing 100083, China Petro China Research Institute of Petroleum Exploration and Development, Beijing 100083, China CNPC Research Institute of Safety &

为了促进涡流排水采气工艺在我国的推广应用，开展了涡流工具特性的模拟研究。建立了涡流工具排液过程的数理模型，对涡流工具引发的旋流场进行了模拟研究，获得了不同雷诺数及持液率下的气液螺旋涡流的流场结构及特点，气速对液膜螺旋流的影响规律，螺旋流动强度的变化规律。研究结果表明，涡流工具使气液两相流体调整为类环状流动，井筒中心以连续气柱的形式向上运动，壁面附近的液膜螺旋上升运动，这种流动结构降低了管柱摩阻，提高了气体携液能力。

In order to facilitate the eddy current drainage gas recovery technology being widely used in China, simulation research on eddy current instrument characteristics was carried out. The mathematical model of eddy current tools draining process was established to study the eddy field triggered by the cyclone of the tools. The simulation figured out the flow field structure and characteristics of gas-liquid spiral vortex flow under different Reynolds numbers and liquid holdup conditions; besides, the influence of gas velocity on liquid membrane spiral flow and variation of spiral flow intensity also obtained from the simulation results. The study had revealed that the gas-liquid two-phase fluid was transformed into kind of annular flow by vortex tools, and the center of the wellbore moved up in a continuous form of gas column accompanied liquid membrane near the wall spiral upward movement. These flow structures reduce string friction and improve gas liquid carrying capacity.