Experimental Study on Flow Pattern of Two-phase Slug (Gas and Liquid) in Fractures

doi:10.3969/j.issn.1006-6535.2024.03.013

Abstract

Abstract: To address the lack of consensus on the slug flow pattern and control factors in the middle section of reservoir fractures, the flow pattern of slug in fracture is studied, the influence and fluctuation characteristics of key parameters of slug flow are analyzed, such as fracture diameter and gas-liquid phase flow rate. The results indicate that the two-phase slug flow presents periodic characteristics in the fracture by using micro-scale flow simulation experimental device of two phase (gas and liquid) migration and production,. From formation to disappearance, the gas slug can be divided into three stages: formation, expansion and dominance. The fracture diameter is linearly negatively correlated with the slug frequency and linearly positively correlated with the fluctuation range of gas and liquid phase flow. As the liquid flow rate was set at 15.00, 20.00, 25.00 and 30.00 cm³/min, the variance ratio of slug frequency decreased with increasing gas flow rate, being 0.130,0.012,0.009 and 0.007, respectively.Similarly, the variance ratio of liquid holdup decreased with increasing gas flow rate, being 1.503,1.175,0.918 and 0.820, respectively. The findings have guiding significance for the study of slug flow mechanism in the process of coalbed methane development.

Key words: gas-liquid phase flow, periodicity, slug flow, liquid holdup, fracture diameter

CLC Number:

TE132.2

Ni Xiaoming, Zhao Yanwei, Guo Shengqiang, He Qinghong, Yan Jin, Song Jinxing. Experimental Study on Flow Pattern of Two-phase Slug (Gas and Liquid) in Fractures[J]. Special Oil & Gas Reservoirs, 2024, 31(3): 98-105.

References

[1] 程先振,陈连军,栾恒杰,等.煤层气运移过程中损伤效应对煤强度的弱化影响[J].岩石力学与工程学报,2022,41(3):503-514.
CHENG Xianzhen, CHEN Lianjun, LUAN Hengjie, et al.Damage effect of coalbed methane transport on coal strength[J].Chinese Journal of Rock Mechanics and Engineering,2022,41(3):503-514.
[2] 琚宜文,李清光,颜志丰,等.煤层气成因类型及其地球化学研究进展[J].煤炭学报,2014,39(5):806-815.
JU Yiwen,LI Qingguang,YAN Zhifeng,et al.Origin types of CBM and their geochemical research progress[J].Journal of Coal Science & Engineering,2014,39(5):806-815.
[3] 徐栋,王玉斌,白坤森,等.煤系非常规天然气一体化压裂液体系研究与应用[J].煤田地质与勘探,2022,50(10):35-43.
XU Dong, WANG Yubin, BAI Kunsen, et al.Research and application of integrated fracturing fluid system for unconventional natural gas in coal measures[J].Coal Geology & Exploration, 2022,50(10):35-43.
[4] 李文庆.气液两相段塞流流动机理的实验研究[D].大庆:大庆石油学院, 2008.
LI Wenqing.Experiment research on the mechanism of gas fluid two-phase slug flow[D].Daqing:Daqing Petroleum Institute, 2008.
[5] MOORE T.Coalbed methane:a review[J].International Journal of Coal Geology,2012,101:36-81.
[6] 刘夷平,张华,王经.水平气-液两相流伪段塞流和段塞流的识别及其理论预测[J].上海交通大学学报,2008,42(8):1247-1253.
LIU Yiping, ZHANG Hua, WANG Jing.Identification and theoretical prediction of pseudo slug flow and slug flow in horizontal gas-liquid two-phase flow[J].Journal of Shanghai Jiao Tong University,2008,42(8):1247-1253.
[7] 戴丽,吴志贤.伯努利效应演示实验装置[J].物理教师,2004,23(7):29-30.
DAI Li, WU Zhixian.Bernoulli effect demonstration experimental device[J].Physics Teacher,2004,23(7):29-30.
[8] 韩兴温,张远凯.煤层气开采过程中段塞流的发现与控制[J].煤炭技术,2020,39(1):32-33.
HAN Xingwen, ZHANG Yuankai.Discovery and control of slug flow in CBM exploitation[J].Coal Technology,2020,39(1):32-33.
[9] SU X, YAO S, SONG J, et al.The discovery and control of slug flow in coalbed methane reservoir[J].Journal of Petroleum Science and Engineering, 2018,172:115-123.
[10] SCHMIDT Z.Experimental study of two-phase slug flow in a pipeline-riser pipe system[D].Tulsa:University of Tulsa,1977.
[11] 陈绍杰, 张继成, ZAKI M M,等.煤层气-水微尺度段塞流动规律相似实验研究[J]. 岩石力学与工程学报, 202241(7):41.
CHEN Shaojie, ZHANG Jicheng, ZAKI M M, et al.Similarity experimental study on the law of CBM-water microscale slug flow[J].Chinese Journal of Rock Mechanics and Engineering, 202241(7):41.
[12] 曹沙沙. 水平变径管中气水两相段塞流特性数值模拟[D].西安:西安石油大学, 2020.
CAO Shasha.Numerical simulation on flow characteristics of gas-water two-phase slug flow in horizontal variable diameter pipe[D].Xi′an:Xi′an Shiyou University, 2020.
[13] 李晓坤. 垂直弯管中段塞流特性实验研究[D].西安:西安石油大学, 2015.
LI Xiaokun.Experimental study on flow characteristics of slug flow in the vertical bending pipe[D].Xi′an:Xi′an Shiyou University, 2015.
[14] 吕宇玲, 杜胜伟, 何利民,等.气液两相流持液率及压降特性的实验研究[J].油气储运, 2006, 25(3):48-51.
LYU Yuling, DU Shengwei, HE Limin, et al.Study on the characteristics parameters of gas-liquid two-phase flow[J].Oil & Gas Storage and Transportation,2006, 25(3):48-51.
[15] 花靖,蒋秀,于超,等.基于改进型SVM算法的气液两相流持液率计算模型[J].西安石油大学学报(自然科学版),2022,37(6):103-110,118.
HUA Jing, JIANG Xiu, YU Chao, et al.Liquid holdup Calculation model of gas-liquid two-phase flow based on improved SVM algorithm[J].Journal of Xi′an Shiyou University(Natural Science Edition),2022,37(6):103-110,118.
[16] 周晓军,宫敬,陈杰.海底管道立管系统弯头部位静、动荷载分析[J].中国海上油气,2005,11(4):268-271.
ZHOU Xiaojun,GONG jing,CHEN jie.Analysis on the static/dynamic load at the elbow in riser system of subsea pipeline[J].China Offshore Oiland Gas,2005,11(4):268-271.
[17] 李效民,李胜,顾洪禄,等.段塞流作用下海底悬跨管道涡激振动特性分析[J].振动与冲击,2022,41(6):37-43,146.
LI Xiaomin,LI Sheng,GU Honglu,et al.Vortex-induced vibrations of a free spanning pipeline with slug flow[J].Journal of Vibration and Shock,2022,41(6):37-43,146.
[18] 张奎涛,顾汉明,刘少勇,等.基于CPML-RML组合边界条件黏弹TTI介质旋转交错网格有限差分正演模拟[J].石油物探,2019,58(2):187-198,218.
ZHANG Kuitao,GU Hanming,LIU Shaoyong,et al.Finite-difference orthorectified simulation based on CPML-RML combined boundary conditions for viscoelastic TTI media with rotating staggered mesh[J].Petroleum Physical Exploration,2019,58(2):187-198,218.
[19] 孙俊杰,郝婷婷,马学虎,等.壁面润湿性对微通道内二氧化碳-水两相流流动及传质性能的影响[J].化工学报,2015,66(9):3405-3412.
SUN Junjie,HAO Tingting,MA Xuehu,et al.Surface wettability effect on carbon dioxide-water two-phase flow and mass transfer in rectangular microchannel[J].Journal of Chemical Engineering,2015,66(9):3405-3412.
[20] 杨永飞,王金雷,王建忠,等.基于VOF方法的超临界二氧化碳-水两相流动孔隙尺度数值模拟[J].天然气工业,2023,43(3):69-77.
YANG Yongfei,WANG Jinlei,WANG Jianzhong, et al.Pore-scale numerical simulation of supercritical CO₂-brine two-phase flow based on VOF method[J]. Natural Gas Industry,2023,43(3):69-77.
[21] 屈晶,申建,韩磊,等.基于CT图像的高阶煤不同宏观煤岩组分裂隙差异发育规律[J].天然气工业,2022,42(6):76-86.
QU Jing, SHEN Jian, HAN Lei,et al.Characteristics of fractures in different macro-coal components in high-rank coal based on CT images[J].Natural Gas Industry,2022,42(6):76-86.
[22] 高岳,朱红钧,颜知音,等.变工况气液段塞流诱导的柔性立管振动响应[J].振动工程学报,2023,36(4):1044-1053.
GAO Yue, ZHU Hongjun, YAN Zhiyin, et al.Slug flow-induced vibration of a flexible catenary riser model with variable gas-liquid flows[J].Journal of Vibration Engineering,2023,36(4):1044-1053.
[23] MEENAKUMARI R N H,ZANGANEH H,HOSSAIN M.Effect of slug characteristics on the nonlinear dynamic response of a long flexible fluid-conveying cylinder[J].Applied Ocean Research,2024,147:103978-103990.