渤西油田严重段塞流控制措施数值模拟
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摘要
渤西油田QK18-2平台至QK18-1平台之间的混输海管存在严重段塞流现象,由于段塞的不稳定性,易导致分离器发生溢流造成危险。采用OLGA软件对两平台之间的海底管道模拟计算得知,立管底部压力和管道出口瞬时液体质量流量发生剧烈的波动。为了防止严重段塞流危害管道及管道下游的工艺设备,分别对顶部节流法、多相泵增压法、气举法3种控制措施进行数值模拟,结果表明:3种方法均能很好地抑制严重段塞流。当节流阀开度为3%、多相泵安装在立管底部且增压为0.5 MPa、注气量为5 kg/s时,海管严重段塞流完全消除。综合考虑,最终推荐采用顶部节流法,建议节流阀开度为10%,以此有效地指导了渤西油田段塞流控制的工程实践。
Severe slug flow occurs in the submarine mixed transportation pipeline between QK18-2 platform and QK18-1 platform in Boxi Oilfield. It is likely to cause the overflow of the separator due to the instability of the slug. In this paper, the submarine pipeline between QK18-2 platform and QK18-1 platform was simulated by OLGA software. It is shown that the pressure at the bottom of the riser and the transient liquid mass flow at the pipe outlet fluctuate violently. In order to prevent the slug flow from damaging the pipeline and the process equipments in the downstream of the pipeline, three control measures(i.e., top throttling method, multiphase pump boosting method and gas lift method) were numerically simulated by OLGA software. It is indicated that these three methods can well control the severe slug flow, The severe slug flow in the submarine pipeline is completely eliminated when the opening of throttle valve is 3%, the multiphase pump is installed at the bottom of the riser, the pressure is increased by 0.5 MPa, and the gas injection rate is 5 kg/s. Based on comprehensive analysis, it is ultimately recommended to adopt the top throttling method with the 10% opening of throttle valve. The research results play an important role in guiding the slug flow control in Boxi Oilfield.
Severe slug flow occurs in the submarine mixed transportation pipeline between QK18-2 platform and QK18-1 platform in Boxi Oilfield. It is likely to cause the overflow of the separator due to the instability of the slug. In this paper, the submarine pipeline between QK18-2 platform and QK18-1 platform was simulated by OLGA software. It is shown that the pressure at the bottom of the riser and the transient liquid mass flow at the pipe outlet fluctuate violently. In order to prevent the slug flow from damaging the pipeline and the process equipments in the downstream of the pipeline, three control measures(i.e., top throttling method, multiphase pump boosting method and gas lift method) were numerically simulated by OLGA software. It is indicated that these three methods can well control the severe slug flow, The severe slug flow in the submarine pipeline is completely eliminated when the opening of throttle valve is 3%, the multiphase pump is installed at the bottom of the riser, the pressure is increased by 0.5 MPa, and the gas injection rate is 5 kg/s. Based on comprehensive analysis, it is ultimately recommended to adopt the top throttling method with the 10% opening of throttle valve. The research results play an important role in guiding the slug flow control in Boxi Oilfield.
引文
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[11]邢兰昌,蒋亚莉,华陈权,等.应用Ω型管调整气液分层流动特性实验研究[J].石油化工高等学校学报,2017,30(1):82-86.XING L C,JIANG Y L,HUA C Q,et al.Experimental study on conditioning gas-liquid stratified flow characteristics with a new flow conditionerΩ-shaped pipe[J].Journal of Petrochemical Universities,2017,30(1):82-86.
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[14]王琳,刘昶,李玉星,等.空气-水立管系统的严重段塞流瞬态数学模型[J].油气储运,2016,35(11):1235-1242.WANG L,LIU C,LI Y X,et al.Transient mathematical model for severe slugging in the air-water riser system[J].Oil&Gas Storage and Transportation,2016,35(11):1235-1242.
[15]沈海静.弯管中段塞流的特性试验研究[D].西安:西安石油大学,2014:1-6.SHEN H J.Experimental study on fl ow characteristics of slug flow in the bending pipe[D].Xi'an:Xi'an Shiyou University,2014:1-6.
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[17]邓心茹.深水流动安全保障技术研究[J].石油工业技术监督,2017,33(1):53-57.DENG X R.Research on fl ow safety assurance technology under deep water[J].Technology Supervision in Petroleum Industry,2017,33(1):53-57.
[18]刘光成.渤西上游油田海管段塞流动态模拟分析研究[D].成都:西南石油大学,2009:37-44.LIU G C.Analysis and study of slug fl ow dynamic simulation in Boxi upstream oil field pipeline[D].Chengdu:Southwest Petroleum University,2009:37-44.
[19]徐孝轩,宫敬.海底混输管线严重段塞流动的预测与控制[J].海洋工程,2005,23(4):121-128.XU X X,GONG J.Severe slugging prediction and elimination in deep-water pipeline riser systems[J].The Ocean Engineering,2005,23(4):121-128.
[20]李文升,郭烈锦,李乃良.严重段塞流现象与立管顶部节流的瞬态模拟[J].工程热物理学报,2014,35(1):104-108.LI W S,GUO L J,LI N L.Transient simulation of severe slugging and riser topside choking[J].Journal of Engineering Thermophysics,2014,35(1):104-108.
[21]程兵,喻西崇,李清平.深水立管严重段塞流控制方法及其模拟分析[J].天然气工业,2011,31(4):89-94.CHENG B,YU X C,LI Q P.Methods for severe slugging control in a deepwater riser and their simulation analysis[J].Natural Gas Industry,2011,31(4):89-94.
[2]SIMON P,PETAR D,ZHEN Y Y.Review of slug detection,modeling and control techniques for offshore oil&gas production processes[J].Science Direct,2015,48(6):89-96.
[3]SCHMIDT Z,BRILL J P,BEGGS H D.Choking can eliminate severe pipeline slugging[J].Oil&Gas Journal,1979,12(12):230-238.
[4]HILL J T.Gas injection at riser base solves slugging flow problems[J].Oil&Gas Journal,1990,88(9):88-92.
[5]HENRIOT V,PAUCHON C.Tacite:Contribution of fluid composition tracking on transient multiphase fl ow simulation[C].Houston:Offshore Technology Conference,1997:629-638.
[6]邱伟伟,宫敬.分流法消除严重段塞流实验研究[J].科学技术与工程,2015,15(1):135-138.QIU W W,GONG J.Elimination experiment of severe slugging in the riser[J].Science Technology and Engineering,2015,15(1):135-138.
[7]SONG S,KOUBA G.Fluids transport optimization using seabed separation[J].Journal of Energy Resources Technology,2000,122(3):105-109.
[8]程兵,李彦辉,李清平,等.海洋石油多相流立管严重段塞流控制方法[J].油气储运,2013,32(12):1285-1288.CHENG B,LI Y H,LI Q P,et al.Control method of severe slug fl ow in riser of offshore oil multiphase fl ow[J].Oil&Gas Storage and Transportation,2013,32(12):1285-1288.
[9]XING L,YUNG H,SHEN J,et al.Experimental study on severe slugging mitigation by applying wavy pipes[J].Chemical Engineering Research&Design,2013,91(1):18-28.
[10]吴昊,王天雨,安杰,等.流动调节器波纹管结构参数的优选[J].油气储运,2017,36(3):341-347.WU H,WANG T Y,AN J,et al.Structural parameter optimization of bellows in flow regulators[J].Oil&Gas Storage and Transportation,2017,36(3):341-347.
[11]邢兰昌,蒋亚莉,华陈权,等.应用Ω型管调整气液分层流动特性实验研究[J].石油化工高等学校学报,2017,30(1):82-86.XING L C,JIANG Y L,HUA C Q,et al.Experimental study on conditioning gas-liquid stratified flow characteristics with a new flow conditionerΩ-shaped pipe[J].Journal of Petrochemical Universities,2017,30(1):82-86.
[12]EHINMOWO A B,ORODU O D,ANAWE P A L,et al.Attenuating severe slug fl ow at large valve opening for increased oil production without feedback control signal[J].Journal of Petroleum Science&Engineering,2016,146:1130-1141.
[13]李明,宫敬,李清平.气液两相流管道流固耦合问题[J].油气储运,2010,29(4):245-250.LI M,GONG J,LI Q P.Liquid-solid coupling problem in gasliquid two-phase flow pipelines[J].Oil&Gas Storage and Transportation,2010,29(4):245-250.
[14]王琳,刘昶,李玉星,等.空气-水立管系统的严重段塞流瞬态数学模型[J].油气储运,2016,35(11):1235-1242.WANG L,LIU C,LI Y X,et al.Transient mathematical model for severe slugging in the air-water riser system[J].Oil&Gas Storage and Transportation,2016,35(11):1235-1242.
[15]沈海静.弯管中段塞流的特性试验研究[D].西安:西安石油大学,2014:1-6.SHEN H J.Experimental study on fl ow characteristics of slug flow in the bending pipe[D].Xi'an:Xi'an Shiyou University,2014:1-6.
[16]邱伟伟,徐孝轩,宫敬.深海立管中严重段塞流特性模拟研究[J].科学技术与工程,2013,13(19):5464-5469.QIU W W,XU X X,GONG J.Simulation of severe slugging in the riser[J].Science Technology and Engineering,2013,13(19):5464-5469.
[17]邓心茹.深水流动安全保障技术研究[J].石油工业技术监督,2017,33(1):53-57.DENG X R.Research on fl ow safety assurance technology under deep water[J].Technology Supervision in Petroleum Industry,2017,33(1):53-57.
[18]刘光成.渤西上游油田海管段塞流动态模拟分析研究[D].成都:西南石油大学,2009:37-44.LIU G C.Analysis and study of slug fl ow dynamic simulation in Boxi upstream oil field pipeline[D].Chengdu:Southwest Petroleum University,2009:37-44.
[19]徐孝轩,宫敬.海底混输管线严重段塞流动的预测与控制[J].海洋工程,2005,23(4):121-128.XU X X,GONG J.Severe slugging prediction and elimination in deep-water pipeline riser systems[J].The Ocean Engineering,2005,23(4):121-128.
[20]李文升,郭烈锦,李乃良.严重段塞流现象与立管顶部节流的瞬态模拟[J].工程热物理学报,2014,35(1):104-108.LI W S,GUO L J,LI N L.Transient simulation of severe slugging and riser topside choking[J].Journal of Engineering Thermophysics,2014,35(1):104-108.
[21]程兵,喻西崇,李清平.深水立管严重段塞流控制方法及其模拟分析[J].天然气工业,2011,31(4):89-94.CHENG B,YU X C,LI Q P.Methods for severe slugging control in a deepwater riser and their simulation analysis[J].Natural Gas Industry,2011,31(4):89-94.