1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China 2. CNOOC Research Institute, Beijing 100028, China
The characteristics of severe slugging flow in two types of riser systems are studied, including occurrence region, pressure fluctuations at riser base, cycle time, and liquid slug length. The flow pattern map in S-shaped flexible riser is compared with the classical severe slugging flow transition criteria. The experimental results show that the severe slugging cycles are similar in two types of risers. However, there is a second growth on the pressure fluctuations in the S-shaped riser compared with the vertical riser. The period duration in the S-shaped riser is longer, but the liquid slug length is shorter. The occurrence region of severe slugging flow in the S-shaped riser is smaller than that in the vertical riser.
Ye J, Guo L.Multiphase flow pattern recognition in pipeline-riser system by statistical feature clustering of pressure fluctuations[J]. Chemical Engineering Science, 2013, 102(11): 486.
doi: 10.1016/j.ces.2013.08.048
[2]
Wilkens R J.Flow Assurance in Fluid Flow Handbook[M]. New York: McGraw-Hill, 2002.
[3]
Mokhatab S, Towler B F.Severe slugging in flexible riser: review of experimental investigations and OLGA Predictions[J]. Petroleum Science and Technology, 2007, 25(7): 867.
doi: 10.1080/10916460601006198
[4]
Nydal O J, Audibert M, Johansen M.Experiments and modeling of gas-liquid flow in an S-shaped riser[C]. Proc. 10th International Multiphase Flow Conference, 2001.
[5]
Yeung H, Tchambak E.Three-phase flows in an S-shaped riser: some preliminary results[C]. Proc. 11th International Multiphase Flow Conference, 2003.
[6]
Malekzadeh R, Henkes R, Mudde R F.Severe slugging in a long pipeline-riser system: experiments and predictions[J]. International Journal of Multiphase Flow, 2012, 46(1): 9.
doi: 10.1016/j.ijmultiphaseflow.2012.06.004
[7]
Tin V.Severe slugging in flexible risers[C]. Proc. 5th International Conference on Multiphase Production, 1991.
[8]
Taitel Y, Dukler A.A model for predicting flow regime transitions in horizontal and near horizontal gas-liquid flow[J]. AIChE Journal, 1976, 22(1): 47.
doi: 10.1002/aic.690220105
[9]
Bøe A.Severe slugging characteristics; part I: flow regime for severe slugging[R]. Selected Topics in Two-Phase Flow, Trondheim, Norway, 1981.