Gas reservoirs in the East China Sea gas fields,which operated by water flooding,are commonly developed.Some gas wells produced along with water,the water/gas ratio of which are high.The traditional two-phase flow wellbore pressure calculation methods were employed to predict wellbore pressure distribution.However,it was found that the current models suffer from low prediction accuracy,which affects the diagnosis of liquid loading conditions in gas wells and the selection of drainage and production measures.To address this issue,gas-liquid two-phase flow patterns under different well diameters,inclinations,and water/gas ratios were analgzel and,a new flow pattern discrimination method suitable for high water/gas ratios was derived based on the discrimination model by corrected Kaya flow pattern.Additionally,the empirical coefficients related to the Mukherjee-Brill liquid holdup calculation formula were revised.Introducing dimensionless parameters characterizing the water/gas ratio and angular correction factors.On this basis,a new pressure drop model applicable to high water/gas ratio gas reservoirs was established.The research shows that the new liquid holdup calculation model achieves an average calculation error of less than 15% for liquid holdup under different pipe diameters and inclinations.The new wellbore pressure drop calculation method improves the prediction accuracy of wellbore pressure in water-injected gas wells in the East China Sea by over 50%,with an error not exceeding 8% compared to measured values.The new method has significant application value for predicting the pressure distribution of two-phase flow in high water/gas ratio gas wells and is of great guiding significance for optimizing operational systems and selecting drainage and gas production processes in the middle and later stages of water-drive gas reservoir development.
Wu Ruidong
,
Li Yuansheng
,
Ma Lian
,
Lu Ying
,
Shi Meixue
,
Liao Ruiquan
,
Cheng Yang
. Prediction Method of Wellbore Pressure Distribution for Gas Wells with High Water/Gas Ratio[J]. Special Oil & Gas Reservoirs, 2024
, 31(5)
: 95
-101
.
DOI: 10.3969/j.issn.1006-6535.2024.05.011
[1] AZIZ K,GOVIER G W.Pressure drop in wells producing oil and gas[J].Journal of Canadian Petroleum Technology,1972,11(3): 38-45.
[2] BEGGS D H,BRILL J P.A study of two-phase flow in inclined pipes[J].Journal of Petroleum technology,1973,25(5):607-617.
[3] BRILL J P.Multiphase flow in wells[J].Journal of petroleum technology, 1987, 39(1): 15-21.
[4] MUKHERJEE H,BRILL J P.Liquid holdup correlations for inclined two-phase flow[J].Journal of Petroleum Technology,1983,35(5):1003-1008.
[5] AZZI A,BELAADI S,FRIEDEL L.Two-phase gas/liquid flow pressure loss in bends[J].Forschung im Ingenieurwesen,2000,65(10):309-318.
[6] EATON B A,KNOWLES C R,SILBERBRG I H.The prediction of flow patterns,liquid holdup and pressure losses occurring during continuous two-phase flow in horizontal pipelines[J].Journal of Petroleum technology,1967,19(6):815-828.
[7] 王琦,李颖川,王志彬,等.水平气井连续携液实验研究及模型评价[J].西南石油大学学报(自然科学版),2014,36(3):139-145.
WANG Qi,LI Yingchuan,WANG Zhibin,et al.Experimental study and model evaluation on continuous liquid removal in horizontal gas well[J].Journal of Southwest Petroleum University(Science & Technology Edition),2014,36(3):139-145.
[8] 王修武,罗威,刘捷,等.油气水多相管流预测方法研究[J].特种油气藏,2018,25(2):70-75.
WANG Xiuwu,LUO Wei,LIU Jie,et al.Oil-gas-water multiphase flow prediction[J].Special Oil & Gas Reservoirs,2018,25(2):70-75.
[9] 任桂蓉.川西水平气井井筒两相管流流型实验研究[D].成都:西南石油大学,2016.
REN Guirong.Experimental study on flow pattern of two-phase pipe flow in wellbore of horizontal gas well in western Sichuan[D].Chengdu:Southwest Petroleum University,2016.
[10] 刘永辉,曹玉峰,王朗,等.水平气井气-水-油三相流动压降模型[J].断块油气田,2022,29(3):404-410.
LIU Yonghui,CAO Yufeng,WANG Lang,et al.Pressure drop model of gas-water-oil three-phase flow in horizontal gas wells[J].Fault-Block Oil & Gas Field,2022,29(3):404-410.
[11] 丁宇奇,兰乘宇,刘巨保,等.连续管压降计算方法与试验测试[J].石油机械,2017,45(2):96-102.
DING Yuqi,LAN Chengyu,LIU Jubao, et al.Calculation method and experimental test of coiled tubing pressure drop[J].China Petroleum Machinery,2017,45(2):96-102.
[12] 姚利明,何俊才,刘巨保,等.连续油管井下弯曲段沿程压降计算方法[J].石油钻采工艺,2016,38(5):650-656.
YAO Liming,HE Juncai,LIU Jubao,et al.Calculation methods for pressure drop along downhole bending section of coiled tubing[J].Oil Drilling & Production Technology,2016,38(5):650-656.
[13] 程阳,陈菲雪,李丽,等.水平气井井眼形态对积液影响实验[J].大庆石油地质与开发,2021,40(4):80-86.
CHENG Yang,CHEN Feixue,LI Li,et al.Experiment study on the influence of borehole geometry on liquid loading in horizontal gas wells[J].Petroleum Geology & Oilfield Development in Daqing,2021,40(4):80-86.
[14] 季强,周兴付,郭兴午,等.川西气田斜井井筒压降预测及其应用研究[J].钻采工艺,2013,36(6):51-54.
JI Qiang,ZHOU Xingfu,GUO Xingwu,et al.Study on pressure drop prediction and its application in deviated wellbore of western Sichuan Gas Field[J].Drilling & Production Technology,2013,36(6):51-54.
[15] 罗程程,靳悦,刘永辉,等.气井零液流量流动模拟实验及模型应用研究[J].钻采工艺,2022,45(4):81-86.
LUO Chengcheng,JIN Yue,LIU Yonghui,et al.Experimental simulation and model application research on zero-liquid-flow conditions in gas well flow dynamics[J].Drilling & Production Technology,2022,45(4):81-86.
