用户名: 密码: 验证码:
粘弹性流体在内管带有等距环槽的同心环空中流动的数值计算
详细信息    本馆镜像全文|  推荐本文 |  |   获取CNKI官网全文
摘要
聚合物驱是提高原油采收率的有效技术之一,其中通过带有同心环形降压槽的配注器实现的聚合物分注技术是提高注聚效果和降低成本的重要工艺措施。聚合物水溶液在带有同心环形降压槽的配注器中的流动可以视为粘弹性流体在内管带有等距环槽的同心环空中的流动。开展粘弹性流体在内管带有等距环槽的同心环空中的流动,可以为单管同心环空降压槽分注技术的参数优选提供理论依据,具有工程实际意义。
     利用变系数二阶流体模型描述粘弹性流体的流变性,建立了柱坐标系下变系数二阶流体在内管带有等距环槽的同心环空中流动的控制方程和压降计算公式,并给出了相应的数值计算方法。以HPAM水溶液为例,对这种流动的视粘度、流函数、速度及压降进行了数值计算,并分析了槽宽、槽深、槽间距、槽数及弹性对视粘度分布、流函数分布、速度分布及压降的影响。结果表明:对于可视为变系数二阶流体的HPAM水溶液在内管带有等距环槽的同心环空中的流动,槽宽、槽深及弹性对视粘度分布影响明显,槽间距和槽数对视粘度分布影响并不明显;槽宽、槽深及弹性对流函数分布影响明显,槽间距和槽数对流函数分布影响并不明显;槽宽、槽深及弹性对速度分布影响明显,槽间距和槽数对速度分布影响并不明显;槽宽、槽深、槽数及弹性对压降影响明显,槽间距对压降影响并不明显。推导了柱坐标系下变系数二阶流体在内管带有等距环槽的同心环空中流动的稳定性参数H的计算公式,并以HPAM水溶液为例,对这种流动的稳定性参数H进行了数值计算和分析。
     通过质量百分比浓度分别为0.050%、0.100%和0.125%的HPAM水溶液在内管带有等距环槽的同心环空中流动的室内实验,根据上述控制方程、压降计算公式和稳定性参数H的计算公式及相应的数值计算方法,将计算压降与实测压降进行了对比,并确定了稳定性参数H的临界最大值。结果表明:计算压降与实测压降的最大平均相对百分比误差为4.12%,可以认为本文建立的柱坐标系下变系数二阶流体在内管带有等距环槽的同心环空中流动的控制方程、压降计算公式及给出的数值计算方法是正确的;变系数二阶流体在内管带有等距环槽的同心环空中流动的稳定性参数H的临界最大值为395。
Polymer injection is one of the effective technology for EOR, in which the technology of separated layer polymer injection achieved by injection allocation with concentric ring depressurization slots on it is an important technical way which can help polymer injection and cost control. Flow of polymer aqueous solution in injection allocation with concentric ring depressurization slots on it can be regarded as flow of viscoelastic fluid in concentric annulus with isometric ring slots on the inner cylinder. The research on the flow of viscoelastic fluid in concentric annulus with isometric ring slots on the inner cylinder can provide a theoretical base on optimization of working parameters for the technology of single string separated layer polymer injection with concentric ring depressurization slots on the string, which is of engineering importance.
     A viscoelastic fluid model of the second-order fluid with variable coefficients is used to describe rheology of the produced fluid, and the governing equation and a formula for calculation of pressure drop for the flow of the second-order fluid in concentric annulus with isometric ring slots on the inner cylinder under the cylindrical coordinate system are established, and the corresponding numerical methods are presented. Taking HPAM aqueous solutions as examples, the apparent viscosity, the stream function, the velocity and the pressure drop of the flow are numerically calculated, and the influences of slot width, slot depth, slot interval, slot number and elasticity on the apparent viscosity, the stream function distribution, the velocity distribution and pressure drop are analyzed, respectively. The results show that as to the flow of the HPAM aquoues solution, which can be regared as the second-order fluid with variable coefficients, in concentric annulus with isometric ring slots on the inner cylinder, the influences of slot width, slot depth and elasticity on the apparent viscosity distribution are obvious, while the influence of slot interval and slot number on it are not obvious;the influences of slot width, slot depth and elasticity on the stream function distribution are obvious, while the influence of slot interval and slot number on it are not obvious;the influences of slot width, slot depth and elasticity on the velocity distribution are obvious, while the influences of slot interval and slot number on it are not obvious;the influences of slot width, slot depth, slot number and elasticity on the pressure drop are obvious, while the influence of slot interval on it is not obvious. A formula of stability parameter H for the flow of the second-order fluid with variable coefficients in concentric annulus with isometric ring slots on the inner cylinder under the cylindrical system is also established, and taking HPAM aqueous solution as an example, the stability parameter H of the flow is numerically calculated and analyzed.
     Through the experiments of the flow of HPAM aqueous solutions, the mass percentage concentrations of which are 0.050%,0.100% and 0.125% respectively, in concentric annulus with isometric ring slots on the inner cylinder, based on the governing equation, the formula for calculation of pressure drop, the formula of stability parameter H and the corresponding numerical methods established and presented, the pressure drop numerically calculated are compared with those experimentally measured, and the critical maximum value of the stability parameter H of the flow is determined. The results show that the maximum average relative errors between the pressure drop numerically calculated and those experimentally measured is 4.12%, so that the governing equation, the formula for calculation of pressure drop and the corresponding numerical methods established and presented in this paper can be testified to be correct, and the critical maximum value of the stability parameter H of the flow of the second-order fluid with variable coefficients in concentric annulus with isometric ring slots on the inner cylinder is 395.
引文
[1]Iyoho Aniekan W, Azar Jamal J. Anaccurate slot-flow model for non-Newtonian fluid flow through eccentric annuli[C]. SPE 00009447.
    [2]吴疆.偏心环空中非牛顿液轴向层流流动规律[J].石油钻采工艺,1985,2:1-14.
    [3]刘希圣,翟应虎.幂律流体及牛顿流体环空轴向流层流流场的研究[J].石油钻采工艺,1985,4:1-13.
    [4]陈静惠,钟鑫,田继安,等.宾汉液体在偏心环空中的层流初探[J].大庆石油学院学报,1987,1:19-25,85.
    [5]钟鑫,孔庆祥.卡森流体轴向同心环空流动规律研究[J].石油钻采工艺,1987,5:27-36.
    [6]刘希圣,樊洪海,丁岗.幂律流体在定向井偏心环空内流动规律的研究[J].石油大学学报(自然科学版),1988,12(4):34-45.
    [7]岳湘安,陈家琅,黄匡道.幂律流体在偏心环形空间中轴向层流的速度分布[J].水动力学研究与进展,1988,3(3):1-9.
    [8]刘永建,陈家琅.偏心环空中幂律流体轴向层流压降的计算[J].石油钻采工艺,1989,5:9-15.
    [9]石建新,刘希圣,丁岗.宾汉流体偏心环空轴向层流流场的研究[J].石油大学学报(自然科学版),1989,13(6):1-8.
    [10]Uner Denlz, Ozgen Canan, Tosun Ismall. Flow of a power-law fluid in an eccentric annulus[C]. SPE 00017002.
    [11]Luo Yuejin, J.M. Peden. Flow of non-Newtonian fluids through eccentric annuli[C]. SPE 00016692.
    [12]韩式方,伍岳庆.管内上随体Maxwell流体非定常流动[J].力学学报,1990,22(5):519-525.
    [13]客进友Cross流体在圆管和环空内流动流场的摄动解[J].石油大学学报(自然科学版),1991,15(2):132-138.
    [14]岳湘安,孔祥言,陈家琅.非牛顿流体在偏心环空中轴向层流的摄动解[J].应用数学和力学,1992,13(3):245-254.
    [15]刘永建,陈家琅,姜淑卿.同心环空中宾汉液体结构流及其稳定性[J].大庆石油学院学报,1992,16(3):18-23.
    [16]朱文辉,刘慈群.Maxwell流体环管不常流动解析解[J].力学学报,1992,24(1):116-121.
    [17]樊洪海,许震芳.赫谢尔-巴尔克莱流体同心环空轴向层流流动规律理论分析[J].水动力学研究与进展,1993,8(3):308-313.
    [18]樊洪海,刘希圣.宾汉流体在钻井同心环空内轴向层流核及压降计算[J].石油大学学报(自然科学版),1993,17(2):27-32.
    [19]樊洪海,刘希圣.赫谢尔-巴尔克莱流体同心环空轴向流流核及压降计算[J].石油大学学报(自然科学版),1993,17(6):28-34.
    [20]汪海阁,刘希圣,丁岗.水平井段偏心环空中非牛顿流体层流流场的研究[J].石油大学学报(自然科学版),1993,17(5):26-34.
    [21]朱文辉,刘慈群.二阶非牛顿流体环管流动解析解[J].应用数学和力学,1993,14(3):195-201.
    [22]汪海阁,刘希圣.屈服-假塑性流体轴向层流流场分析[J].中国海上油气(工程),1994,6(5):35-41.
    [23]杨树人,张景富,陈家琅,等.幂律流体在偏心环空中流动的数值计算方法[J].大庆石油学院学报,1996,20(2):11-14.
    [24]杨树人,申家年,张景富.幂律流体偏心环空轴向层流流动的速度分布[J].大庆石油学院学报,1997,21(1):122-125.
    [25]王艳辉.偏心环空非牛顿流体紊动场特性的研究[J].水动力学研究与进展,1997,12(2):150-156.
    [26]汪海阁,朱明亮.屈服假塑性流体偏心环空流动的基本特征[J].钻采工艺,1997,20(6):5-11.
    [27]赵英海.研究流体在偏心环空内流动的新方法[J].应用力学学报,1997,14(3):105-109.
    [28]汪海阁,苏义脑.偏心环空压降的实用求解法[J].石油钻采工艺,1997,19(6):5-9,23.
    [29]朱法银.环空中钻井液层流流动的简化解析解[J].胜利学刊,1998,12(4):1-4.
    [30]汪海阁,苏义脑.Robertson-Stiff流体在偏心环空中的流动[J].应用数学和力学,1998,19(10):931-940.
    [31]付强,韩式方,吴持恭.应用谱方法研究管内非牛顿流体的非定常流动[J].四川联合大学学报(工程科学版),1998,2(3):105-111.
    [32]祝世兴,高德,刘彩玲.剪切稠化流体(n=2)环管层流运动分析[J].中国民航学院学报,1999,17(6):10-15.
    [33]展宝真,朱法银.H-B流体在小井眼同心环空中轴向层流的运动规律[J].钻井液与完井液,2000,17(5):1-5.
    [34]徐建平,陈钦雷,霍子伦.非牛顿流体通过偏心环空的速度分布[J].油气井测试,2000,9(3):20-21,40.
    [35]郑俊德,刘合,阎熙照,等.聚合物产出液在抽油泵的缝隙中流动[J].石油学报,2000,21(1):71-75.
    [36]韩式方.非牛顿钻井流体流动计算机智能解析方[J].西南石油学院学报,2001, 23(4):13-16.
    [37]李兆敏,王渊,张琪.宾汉流体在环空中流动时的速度分布规律[J].石油学报,2002,23(2):87-91.
    [38]杨自栋,顾国庆.偏心环空轴向流动的级数解及其流量计算[J].淄博学院学报(自然科学与工程版),2002,4(4):52-55.
    [39]贺成才.幂律流体在偏心环空中流动的数值模拟[J].石油学报,2002,23(6):85-89.
    [40]宋道云,刘洪来,方波,等.黏弹性流体在圆管内流动的谱方法模拟计算[J].力学与实践,2002,24(6):18-20.
    [41]崔海清,孙智,高涛.非Newton流体在内管做轴向往复运动的偏心环空中非定常流的速度分布[J].水动力学研究与进展,2003,18(6):711-715.
    [42]孙智,高涛,崔海清.流体在内管做轴向运动的偏心环空中的速度分布[J].大庆石油学院学报,2004,28(1):10-13.
    [43]杨元建,高涛,崔海清.幂律流体在内管做轴向往复运动的偏心环空中非定常流的流量分布[J].大庆石油学院学报,2004,28(6):17-19.
    [44]高涛.幂律流体在内管做轴向往复运动的偏心环空中的非定常流[D].大庆石油学院硕士研究生学位论文,2004.
    [45]孙智.聚合物驱油井产出液在抽油杆做轴向运动的井筒中的流动-理论,计算和应用[D].大庆石油学院博士研究生学位论文,2004.
    [46]李兆敏,张平,董贤勇,等.屈服假塑性流体轴向同心环空中速度及温度分布研究[J].水动力学研究与进展,2004,19(1):31-37.
    [47]李兆敏,张平,黄善波,等.Casson流体轴向同心环空中速度及温度分布研究[J].石油学报,2004,25(4):105-108.
    [48]国丽萍.粘弹性流体动力学在抽油机井防偏磨中的应用[D].大庆石油学院硕士研究生学位论文,2004.
    [49]韩洪升,王德民,国丽萍,等.粘弹性流体法向应力对抽油杆偏磨的影响机理[J].石油学报,2004,25(4):92-95.
    [50]Yang Zidong, Liu Junying. Numerical analysis of laminar viscous non-Newtonian liquids flows in an eccentric annuli [C].Proceedings of the Fourth International Conference on Fluid Mechanics,2004,7:452-456.
    [51]崔海清,郭军辉,郑晓松,等.流体在内管做轴向往复运动的偏心环空中非定常流的流量分布[C].第七届全国水动力学学术会议暨第十九届全国水动力学研讨会论文集,2005:576-582.
    [52]崔海清,杨元建,高涛.幂律流体在内管做轴向往复运动的偏心环空中非定常流的流量计算[J].石油学报,2005,26(3):106-109.
    [53]杨树人,王春生,崔海清,等.黏弹流体偏心环空流动的数值计算[C].第七届全国水动力学学术会议暨第十九届全国水动力学研讨会论文集,2005:630-636.
    [54]杨元建.粘弹性流体在内管作轴向往复运动的偏心环空中的非定常流[D].大庆石油学院博士研究生学位论文,2005.
    [55]王春生.粘弹性流体在内管做轴向运动的偏心环空中定常流动的数值计算[D].大庆石油学院硕士研究生学位论文,2005.
    [56]袁志彬,高文凤,孙涛.Bingham流体环空管流流动及传热规律研究[J].管道技术与设备,2005,1:11-14.
    [57]贺成才.宾汉、幂律流体在偏心环空中流动的计算机仿真[J].钻井液与完井液,2005,22(3):53-56.
    [58]杨晶,杨树人,王春生.聚驱井抽油杆偏磨原因及预防[J].大庆石油学院学报,2005,29(1):114-115.
    [59]董贤勇,李兆敏,黄善波.内管轴向运动对环空内宾汉流体流动规律的影响[J].石油大学学报(自然科学版),2005,29(6):82-86.
    [60]Yang Shuren, Wang Chun-sheng, Cui Hai-qing, et al. Numerical simulation of steady flow for viscoelastic fluid in an eccentric annulus with inner rod moving axially [J]. Journal of Hydrodynamics,2005,17(4):514-518.
    [61]杨树人.粘弹性流体偏心环空非定常流的数值计算[D].大庆石油学院博士研究生学位论文,2006.
    [62]郭军辉.偏心环空中做轴向运动的内管所受粘弹性流体作用力的数值计算[D].大庆石油学院硕士研究生学位论文,2006.
    [63]周立杰.幂律流体环空管道内部流场PIV实验研究[D].大庆石油学院硕士研究生学位论文,2006.
    [64]贺成才.宾汉流体偏心环状管流的数值模拟[J].天然气与石油,2006,24(5):13-15.
    [65]贺成才.幂律流体在偏心环空中流动的Hanks稳定性参数[J].钻井液与完井液,2006,23(4):28-31.
    [66]Ozbayoglu M.E, Omurlu C. Analysis of the effect of eccentricity on flow characteristics of annular flow of non-Newtonian fluids using finite element method[C]. SPE 100147.
    [67]Wang Yan, Cui Haiqing, Yang Yuanjian, et al. Pressure distribution on the wall of the inner cylinder reciprocating axially to the unsteady flow of viscoelastic fluid in eccentric annulus [J]. Journal of Hydrodynamics,2006,18(5):606-612.
    [68]崔海清,张小宁,李楠.二阶流体在内管做轴向往复运动的偏心环空中非定常流的流量分布[J].大庆石油学院学报,2007,31(3):21-24.
    [69]郭军辉,崔海清,王晓艳.偏心环空中内管壁受非牛顿流体作用力的数值计算[J].西安石油大学学报(自然科学版),2007,22(5):29-32,36.
    [70]常瑛,包志晶,崔海清.流体在内管做轴向往复运动偏心环空中非定常流的压力梯度[J].大庆石油学院学报,2007,31(6):40-43,61.
    [71]汪岩.粘弹性流体偏心环空非定常流的研究[D].大庆石油学院硕士研究生学位论文,2007.
    [72]魏淑慧.偏心环空流场的CFD模拟[D].大庆石油学院硕士研究生学位论文,2007.
    [73]张小宁.聚驱工况下抽汲液在井筒中流动的流量数值计算[D].大庆石油学院硕士研究生学位论文,2007.
    [74]蒋世全.牛顿流体条件下偏心环空间隙雷诺数及层流区域方程研究[J].中国海上油气,2007,19(6):398-401.
    [75]Yuan Aiwu, Cui Haiqing, Gao Tao. Investigation on the flow stability of Newtonian fluid in eccentric annulus via the axial reciprocation of the inner tube [J]. Journal of Hydrodynamics,2007,19(6):671-676.
    [76]汪友平,李永东,陈立敏.赫-巴流体在同心环空中速度分布规律的研究[J].钻井液与完井液,2008,25(2):34-36.
    [77]韩洪升,姚洪英,邢均,等.基于PHOENICS与PIV的幂律流体环空流数值模拟[J].大庆石油学院学报,2008,32(6):46-49.
    [78]包志晶.流体在内管做轴向往复运动偏心环空中非定常流的压力梯度[D].大庆石油学院硕士研究生学位论文,2008.
    [79]邢均.幂律流体环空流数值模拟及PIV实验研究[D].大庆石油学院硕士研究生学位论文,2008.
    [80]徐国民,李楠,崔海清.幂律流体在内管做轴向往复运动的偏心环空中非定常流压力梯度的数值计算[J].大庆石油学院学报,2009,33(1):21-23.
    [81]鲁港,王立波,王冠军,等.幂律钻井液同心环空轴向层流压降的计算[J].断块油气田,2009,16(4):127-129.
    [82]陈皖.偏心环空流场的数值计算[D].大庆石油学院硕士研究生学位论文,2009.
    [83]黄善波,李兆敏.聚合物驱井内流体作用于抽油杆的侧向力解析[J].石油学报,2009,30(1):149-153.
    [84]蒋世全.幂律流体偏心环空间隙雷诺数及层流区域计算方法研究[J].中国海上油气,2009,21(3):186-189.
    [85]王常斌,陈皖,田迪,等.幂律流体偏心环空流场的CFD模拟[J].钻井液与完井液,2009,26(3):62-64.
    [86]李楠,宋兴良,张小宁.黏弹性流体在内管做轴向往复运动的偏心环空中非定常流的平均流量计算[J].大庆石油学院学报,2009,33(2):44-47.
    [87]Pilehvari Ali, Serth Robert. Generalized hydraulic calculation method for axial flow of non-Newtonian fluids in eccentric annuli[C].SPE 111514.
    [88]李楠.粘弹性流体在内管做轴向往复运动的偏心环空中非定常流的压力梯度[D].大庆石油学院博士研究生学位论文,2010.
    [89]Trogdon S.A, Joseph D.D. Matched eigenfunction expansions for slow flow over a slot [J]. Journal of Non-Newtonian Fluid Mechanics,1982,10:185-213.
    [90]Malkus D.S, Bernstein B. Flow of a curtiss-bird fluid over a transverse slot using the finite element drift-function method [J]. Journal of Non-Newtonian Fluid Mechanics, 1984,16:77-116.
    [91]Bird R.B, Saab H.H, Curtiss C. J. Phys. Chem[M].1982:1102.
    [92]Mori Noriyasu, Ono Hiroyasu, Nakamura Kiyoji. Numerical calculation of hole-pressure error for viscoelastic fluids [J]. Journal of the Textile Machinery Society of Japan,1988,36(4):119-126.
    [93]Hsu Cheng-Hsing, Chou Tzu-Yao. Unsteady flow of a second-grade fluid past a backward-facing step [J]. International Journal of Non-Linear Mechanics,1997,32(5): 947-960.
    [94]Wu G.H, Chen C.K, Ju S.H. On the flow of a polymer melt passing over a transverse slot [J]. Journal of Polymer Engineering,1999,19(3):175-196.
    [95]林高平,龚晓波,冯霄,等.圆管突扩层流流动计算[J].西安交通大学学报,2000,34(6):108-110.
    [96]马亮,聂建军.含运动杆及接箍的管流流动的数值模拟研[J].水动力学研究与进展,2003,18(1):1-7.
    [97]尹洪军,钟会影,王洪涛,等.扩张流道内修正上随体Maxwell粘弹性流体的流动[J].特种油气藏,2005,12(4):36-39.
    [98]崔海清,宋兴良,裴晓含,等.聚丙烯酰胺水溶液在内管带有等距环槽的同心环空中流动的压降[J].大庆石油学院学报,2006,30(2):38-40,56.
    [99]孟令尊,崔海清,王常斌,等.分层配注器波纹环空流场的数值模拟[J].石油机械,2006,34(2):15-17.
    [100]孟令尊,崔海清,崔金哲,等.非牛顿流体在配注器波纹杆环空中流动的数值模拟[J].大庆石油学院学报,2006,30(2):38-40,56.
    [101]孟令尊.梭形杆环空流场数值计算及应用[D].大庆石油学院博士研究生学位论文,2007.
    [102]尹洪军,姜海梅,钟会影,等SPTT黏弹性流体在突缩流道内的流动[J].大庆石油地质与开发,2008,27(2):56-59.
    [103]裴晓含,王野,崔海清,等.流体在内管带环槽环空流场的数值模拟[C].第二十一届全国水动力学研讨会暨第八届全国水动力学学术会议暨两岸船舶与海洋工程水动力学研讨会论文集,2008:271-276.
    [104]姜海梅,尹洪军,苏宇驰,等.用有限体积法对粘弹性流体的扩张流动进行数值模拟[J].特种油气藏,2009,16(1):75-78.
    [105]尹洪军,姜海梅,苏宇驰,等.黏弹性聚合物溶液在突扩孔道内的流动特性[J].高分子学报,2009,6:520-524.
    [106]王野.内管带环槽环空的配注器内流场的数值模拟[D].大庆石油学院硕士研究生学位论文,2009.
    [107]Mori Noriyasu, Eguchi Takaaki, Nakamura Kiyoji, et al. Pressure flow of non-Newtonian fluids between eccentric double cylinders with the inner cylinder rotating. Part1: Numerical calculation[J]. Journal of the Textile Machinery Society of Japan,1987,33(2):46-53.
    [108]Mori Noriyasu, Yagami Mitsuhiro, Eguchi Takaaki, et al. Pressure flow of non-Newtonian fluids between eccentric double cylinders with the inner cylinder rotating. Part2:Experiment[J]. Journal of the Textile Machinery Society of Japan,1987, 33(3):73-77.
    [109]韩式方.非牛顿流体力学本构方程和计算解析理论[M].科学出版社,2000:1-3,22-36,101-112.
    [110]崔海清.石油工程中非Newton流体管流[M].北京:石油工业出版社,1994:33-45,118-124,149.
    [111]周光炯,严宗毅,许世雄,等.流体力学(第二版)[M].北京:高等教育出版社,2000:273,281.
    [112]刘乃震,王廷瑞,刘孝良,等.非牛顿流体的稳定性及其流态判别[J].天然气工业,2003,23(1):53-57.
    [113]Morton K.W, Mayers D.F. Numerical Sllution of Partial Differential Equations[M]. Posts& Telecom Press,2006:7-18.
    [114]李荣华.偏微分方程数值解法[M].高等教育出版社,2005:196-204.
    [115]冯有前.数值分析[M].清华大学出版社,2006,110-131.
    [116]李兴华.密度计量[M].北京:中国计量出版社,2002:96-97.
    [117]蔡萌.粘弹性流体在内管做行星运动的环空中流动的数值计算[D].大庆石油学院博士研究生学位论文,2008.
    [118]Mori Noriyasu, Ono Hiroyasu, Nakamura Kiyoji. Numerical calculation of hole-pressure error for viscoelastic fluids [J]. Journal of the Textile Machinery Society of Japan,1988,36(4):119-126.

© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号

地址:北京市海淀区学院路29号 邮编:100083

电话:办公室:(+86 10)66554848;文献借阅、咨询服务、科技查新:66554700