• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    Vessel Motion Effects on Nonlinear Dynamics of Deepwater Drilling Riser

    2014-06-07 07:53:24
    船舶力學(xué) 2014年9期
    關(guān)鍵詞:工程系石油大學(xué)深水

    (Department of Offshore Engineering,China University of Petroleum,Dongying 257061,China)

    Vessel Motion Effects on Nonlinear Dynamics of Deepwater Drilling Riser

    WANG Teng,ZHANG Xiu-zhan,ZHU Wei-quan

    (Department of Offshore Engineering,China University of Petroleum,Dongying 257061,China)

    A time domain computer model for deepwater drilling riser subjected to waves,ocean currents and vessel motion was developed in this paper.The vessel motions effects on the dynamic response of deepwater riser are investigated,including mean offsets,wave frequency motions,low frequency motions,period and amplitude of the motion.The results show that vessel motion has an important effect on the dynamic response of deepwater riser,and lead to an increase of upper maximum bending moment by 59%compared to the case without vessel motion,under random waves and current.The mean vessel offset has main effect on lower maximum bending moment.Wave frequency motion has notable effect on the upper maximum bending moment of the drilling riser,and changed sharply with amplitude or period of the wave frequency motion decreasing.Low frequency motion mainly affects the upper maximum bending moment of the drilling riser.

    drilling riser;deepwater;vessel motion;nonlinear dynamics response

    Biography:WANG Teng(1973-),male,Ph.D.,professor of China University of Petroleum,E-mail:wteng1973@126.com.

    1 Introduction

    The drilling riser is the key element for drilling in deep water.It is a conductor pipe used in floating drilling operations to convey drilling fluid and to guide tools between the drilling vessel and the wellhead at the sea floor.As exploratory drilling operations move into deeper water,the dynamic effects in riser design become of increasing concern.The dynamic response of riser depends on numerous different factors related to its architecture,operational and environmental conditions.These include water depth,mud weight,sea states current profiles and vessel motion.As the increase of water depth,vessel motions are more significant for dynamic response of deepwater riser,and produce significant dynamic stress in the drilling riser.

    In the dynamic analysis,the effect of vessel motions should be combined with wave and current forces to obtain the response of the riser.Vessel offset and motions constitute a source of both static and dynamic loading on the riser[1].The horizontal motions of the drilling vessel in waves are a major factor in determining the dynamics response of marine riser and a sig-nificant design factor in deepwater(Burke,1974)[2].Heuze et al(1976)[3]studied the dynamics of a 4 000ft riser,taken in account the sinusoidal motions of the floating support.Sexton and Agbezuge(1976)[4]pointed out that vessel motion is very important in determining drilling riser behavior,and the vessel motion model must include three terms:mean vessel offset,long term drift motion,and instantaneous vessel response to waves.For the dynamic response of an unbuoyed marine riser subjected to periodic excitation from a surface vessel in the direction of wave propagation,Kirk and Etok(1979)[5]presented a frequency domain normal mode solution.Patel and Sarohia(1984)[6]studied the dynamic of marine riser in the frequency domain by linearizing the hydrodynamic damping term,to determine marine riser displacements and stresses due to self-weight,buoyancy,internal and external pressures,surface vessel motions and environmental forces arising from currents and waves.To solve the marine riser differential equation,Kirk(1985)[7]presented the Galerkin method,and this analysis method is applicable to any riser system subjected to horizontal exciting forces due to fluid and vessel motion.Ahmad and Datta(1989,1992)[8-9]investigated the nonlinear dynamic response of marine risers in frequency domain and time domain,and took into account the long-term drift oscillation and the instantaneous motion of the top vessel.Atadan et al(1997)[10]studied the forced dynamics of the system comprised of a riser,connected to a floating platform and conveying fluid,in the presence of ocean waves and ocean currents.Kuiper et al(2007)[11]studied stability of a straight deepwater riser connected to a heaving floating platform,and took into account the effect of the fluctuation in time of the axial tension of the riser.Most of fore mentioned studies took into account the horizontal excitation from a surface vessel but they did not consider how each term of vessel motion influences the dynamics of marine risers.

    In this paper,a time domain computer model for deepwater drilling riser subjected to waves,ocean currents and vessel motion is developed,and solved by finite-difference method.The effects of the vessel motion on the dynamic response of deepwater drilling riser are investigated,and the effect of mean offset,wave frequency motion and low frequency motion on the envelopes of maximum bending moment are presented.

    2 Mathematical model

    2.1 Assumptions

    (1)The drilling riser is made of homogeneous,isotropic and linear elastic material.The effect of choke and kill lines is ignored.

    (2)Waves and currents are in the same plane,and riser motion is restrained in two dimensions.

    2.2 Governing equation

    The coordinate system for the riser is defined as follows.The vertical coordinate,z,has its origin at the bottom of the riser and is positive upward;the horizontal deflection of the riser,y,is measured from a vertical axis through the base of the riser at the sea floor.

    The equation of motion governing the horizontal displacement y(z,t) of deepwater drilling riser as a function of depth z and time t can be written as

    where,EI is the bending stiffness of the riser,Teis the effective tension in the riser,c is the structure linear viscous damping coefficient,m(z,t) is the mass per unit length(the sum of marine riser structural mass and that its internal fluid mass),f(z,t) is the hydrodynamic load acting on a unit length of the riser in horizontal direction.

    As described in McIver and Olson(1981)[12],the effective tension in riser can be expressed as

    where,Ttopis top tension applied at the top of the riser,w is equal to the product of the mass per unit length and acceleration of gravity for the elements located above the free surface of the waves and the buoyant weight for totally submerged elements.

    Finally,substituting Eq.(2)into Eq.(1)yields:

    2.3 Waves and current excitation force

    Because the drilling riser is basically a slender body,the excitation force f z,( )t on the riser can be computed using the well-known Morison’s equation that is the sum of the drag force fDand inertia force fM.Taking into account the relative motion between the riser and the flow-induced kinematics,the force per unit length can be expressed as

    where,ρwis the density of seawater,D is the outer diameter of riser,u z,( )t is the horizontal component of water particle velocity,CDis the drag coefficient,CMis the inertia coefficient,CAis the hydrodynamic added-mass coefficient,and CM=CA+1.

    Substituting Eq.(4)into Eq.(3),and moving the hydrodynamic added-mass to the left side of governing equation yields

    2.4 Boundary conditions

    The lower end of the riser is connected to wellhead through the lower ball joint,which fixed the lateral offset and allowed rotation.Assumed that the bending stiffness of the lower ball joint is zero,the lower boundary conditions can be expressed as

    The upper end of the riser system is connected to the floating platform through a flexible ball joint.The horizontal motion of the upper end of the riser system takes place as a result of that of the platform.The heave movement is neglected.Thus,the upper boundary conditions can be represented as follows,

    3 Horizontal vessel motion

    The main data regarding vessel motions needed for riser designs are mean offset,wave frequency motions and low frequency motions.Vessel mean offset is the offset created by steady forces from current,wind and waves.Wave frequency motions are the motions at the frequencies of incident waves,a direct consequence of first order wave forces acting on the vessel,causing the platform to move at periods typically between 3-25 seconds,and termed the wave frequency(WF)regime.Low frequency(LF)motion is the motion response at frequencies below wave frequencies at,or near surge,sway and yaw eigenperiods for the vessel.LF motions typically have periods ranging from 30 to 300 seconds.

    Vessel motion can be obtained from computer simulations,or from knowledge of the vessel RAOs and the design wave data.As described in Sexton and Agbezuge(1976)[4],vessel motion model is given by

    4 Numerical study

    4.1 Riser analysis parameters

    In this paper,to study the effect of vessel motion on the nonlinear dynamics of deepwater drilling riser,a deepwater drilling riser of length 1 000m is studied by solving the four-order nonlinear partial differential equation,using the finite-difference method.Riser analysis parameters are given as follows

    (1)Riser system data

    (2)Environmental load condition

    4.2 Simulation of random waves

    In this study,the one-sided Pierson-Moskowitz spectrum for the surface elevation η is used.

    where Α0and B are given by

    where,g is the gravitational acceleration,Uw,19.5is the wind velocity evaluated 19.5m above the still water level.

    The surface elevation,as a function of both time and spatial coordinate y,is represented in term of finite sums as

    where φnis a random number between 0 and 2π,and

    The frequency ω0is zero,and ωNis chosen so that most of the area is contained between ω0and ωN.The frequencies ω1to ωN-1are chosen so that the area under the spectrum curve for each interval is equal(Seon Han,2001)[13].The area between the intervals ω0to ωnis n/N of total area under the curve between the intervals ω0to ωN.Therefore, ωnis given by

    From Eq.(10)and Eq.(11),

    And η is written as

    Therefore,the wave velocities are given by

    In this study,ωN=1.5rad/s and N=15,time history of wave elevation is plotted in Fig.1,for Hs=6.5m and Ts=8s.

    4.3 The effect of vessel motion due to random waves and current

    The time history of vessel motion,under random waves and current,is shown in Fig.2.And the current velocity profile is uc=(z/ d )1/7+0.5( z/ d ).The effect of vessel motion(determined by equation(8))due to random waves(Hs=6.5m and Ts=8s)and current on the envelopes of maximum bending moment are presented in Fig.3.It can be seen from Fig.3 that the maximum bending moment distribution of the drilling riser has two maxima,the upper one located just below MWL(mean water level)and the lower one located 50m above the lower ball joint.With vessel motion the lower maximum bending moment increases by 29%and the upper maximum bending moment increases by 59%,compared with that without vessel motion.

    The time history of bending moment at location 985m(height above sea floor)is presented in Fig.4.It can be seen from Fig.4 that the vessel motion produces higher cycle stress compared with that without vessel motion,which would accelerate the fatigue failure,and reduce the fatigue life of the drilling riser.

    4.4 The effect of vessel motion due to regular wave and current

    With regular waves the vessel motion is simulated by three terms:mean vessel offset,low frequency motion given in the former parameters,and wave frequency motion assumed to be a harmonic motion with amplitude 2.0m and period 8s.

    The effect of vessel motion on the maximum bending moment distribution of drilling riser under current and regular wave(6.5m/8s)is presented in Fig.5.As shown in Fig.5,vessel motion increases the lower maximum bending moment by 24%and the upper maximum bending moment by 91%,compared with that without vessel motion.

    The time history of bending moment at location 985m for regular wave is presented in Fig.6.It can be seen from Fig.6 that the vessel motion produces higher cycle stress and lower frequency component compared with that without vessel motion.

    4.5 The effect of mean vessel offset on the dynamic response of the drilling riser

    The effect of mean vessel offset on bending moment distribution of the drilling riser un-der current and regular wave(6.5m/8s)is presented in Fig.7.As shown in Fig.7 the mean vessel offset has remarkable influence on the lower maximum bending moment,located at depth about 50m.With the mean vessel offset increasing the lower bending moment increases considerably,while the upper maximum bending moment is insensitive to mean vessel offset.Under the condition that So=4%d,the lower maximum bending moment increased 47%,compared with that So=0m.

    4.6 The effect of low frequency motion on the dynamic response of the drilling riser

    To study the effect of low frequency motion and wave frequency motion on the dynamic response of the drilling riser,vessel motion are taken into account as low frequency motion and wave frequency motion respectively,and wave frequency motion to regular wave is assumed to be harmonic.

    The effects of period and amplitude of low frequency motion on the dynamics of the riser,under current and regular wave(6.5m/8s),are shown in Figs.8-9 with mean vessel offset So=2%d.In the figures,Sl denotes the amplitude of low frequency motion,and Tl denotes the period of low frequency motion.

    Fig.8 illustrates the effect of amplitude of low frequency motion on the maximum bending moment distribution along the riser,with Tl=200s.As shown in Fig.8,the bending moment of the riser increases with the amplitude of low frequency motion.Under the condition that Sl=15m,the upper and lower maximum bending moment increased 39%and 11%,respectively,compared with that Sl=0m.

    Fig.9 indicates the effect of period of low frequency motion on the maximum bending moment distribution along the riser,with Sl=10m.It can be seen from Fig.9 that the period of low frequency motion mainly affects the bending moment distribution of upper portion of the drilling riser.With Tl increasing,the maximum bending moment of the riser decreases.

    4.7 The effect of wave frequency motion on the dynamic response of the drilling riser

    The effects of the amplitude and period of wave frequency motion(assumed to be harmonic)on the dynamic response of the drilling riser,under current and regular wave(6.5m/8s),are shown in Figs.10-11,with mean vessel offset So=2%d.In figures,Sn denotes the amplitude of wave frequency motion to regular wave,and Tn denotes the period of wave frequency motion.

    Fig.10 illustrates the effect of amplitude of wave frequency motion on the maximum bending moment distribution along the riser,with Tn=8s.As shown in Fig.10,the wave frequency motion has an important influence on the upper bending moment of the riser.The maximum bending moment of the riser increases notablely with the amplitude of wave frequency motion increases.Under the condition that Sn=3.25m,the upper and lower maximum bending moment increased 246%and 0.6%respectively,compared with that Sn=0m.

    Fig.11 indicates the effect of period of wave frequency motion on the maximum bending moment distribution along the riser,with Sn=1.625m.It can be seen from Fig.11 that the period of wave frequency motion has an important influence on the upper bending moment of the riser,just as the amplitude of wave frequency motion.With Tn increasing,the maximum bending moment of the riser decreases sharply.From these two figures,it can be concluded that wave frequency motion is the major factor in determining the upper maximum bending moment of the drilling riser.

    5 Conclusions

    The effects of the vessel motion on the dynamic response of deepwater drilling riser have been investigated.The dynamic response was obtained in time domain by solving the fourthorder partial differential equation,and the effects of mean vessel offset,low frequency motion and wave frequency motion to both regular and random waves have been studied.The following conclusions were derived:

    (1)The horizontal motions of the vessel is a major factor in determining the dynamic response of the deepwater drilling riser,and the motion characteristic of the vessel in waves is a significant factor in determining riser design.

    (2)Mean vessel offset mainly affects the lower maximum bending moment,located at depth about 50m.

    (3)Wave frequency motion has notable effect on the upper maximum bending moment of the drilling riser,and increases sharply with amplitude of the wave frequency motion increasing or period of the wave frequency motion decreasing.

    (4)Low frequency motion mainly affects the upper maximum bending moment of the drilling riser,and increases with amplitude of the low frequency motion increasing or period of the low frequency motion decreasing.

    [1]DNV.Dynamic Risers[S].DNV-OS-F201,2001.

    [2]Burke B G.An analysis of marine risers for deep water[R].SPE4443,1974.

    [3]Heuze L R,Chaussumier D,Guesnon J,et al.A 4,000-foot riser[J].Journal of Petroleum Technology,1976(4):489-496.

    [4]Sexton R M,Agbezuge L K.Random wave and vessel motion effects on drilling riser dynamics[C]//The Eighth Annual Offshore Technology Conference.Houston,Texas,USA.OTC2650,1976:391-398.

    [5]Kirk C L,Etok E U.Dynamic and static analysis of a marine riser[J].Applied Ocean Research,1979,1(3):125-135.

    [6]Patel M H,Sarohia S.Finite-element analysis of the marine riser[J].Engineering Structures,1984,6(3):175-184.

    [7]Kirk C L.Dynamic response of marine risers by single wave and spectral analysis methods[J].Applied Ocean Research,1985,7(1):2-13.

    [8]Ahmad S,Datta T K.Nonlinear response analysis of marine risers[J].Computers&Structures,1992,43(2):281-295.

    [9]Ahmad S,Datta T K.Dynamic response of marine risers[J].Engineering Structures,1989,11(3):179-188.

    [10]Atadan A S,Calisal S M,Modi V J,Guo Y.Analytical and numerical analysis of a marine riser connected to a floating platform[J].Ocean Engineering,1997,24(2):111-131.

    [11]Kuipera G L,Brugmansb J,Metrikine A V.Destabilization of deep-water risers by a heaving platform[J].Journal of Sound and Vibration[J/OL].doi:10.1016/j.jsv.2007.05.020.

    [12]McIver D B,Olson R J.Riser effective tension-Now you see it,now you don’t![C]//ASME Proceedings of the 37th Petroleum Mechanical Engineering Workshop&Conference.Dallas,TX,1981:177-187.

    [13]Seon Han.Vibration of a compliant structure in an ocean environment[D].A dissertation for the degree of doctor,The State University of New Jersey,2001.

    平臺運(yùn)動對深水鉆井隔水管非線性動力響應(yīng)的影響

    王 騰,張修占,朱為全

    (中國石油大學(xué)(華東)海洋工程系,山東 東營 257061)

    文章建立了波浪、海流和船體運(yùn)動等載荷綜合作用下的深水鉆井隔水管非線性時域動力響應(yīng)模型,模型考慮了頂部張力和隔水管內(nèi)部泥漿對隔水管動力響應(yīng)的影響,計(jì)入了張力沿隔水管長度的變化,并采用有限差分法求解了四階偏微分運(yùn)動方程。計(jì)算了隨機(jī)波浪和規(guī)則波浪下船體運(yùn)動對深水鉆井隔水管非線性動力響應(yīng)的影響,研究分析了船體平均偏移以及波頻響應(yīng)和低頻響應(yīng)的周期和幅值對深水鉆井隔水管動力響應(yīng)的影響。結(jié)果表明,船體運(yùn)動對深水鉆井隔水管動力響應(yīng)有較大的影響,在隨機(jī)波浪和海流作用下,考慮船體運(yùn)動時,隔水管上部最大彎矩增大了59%。船體的平均偏移主要影響底部最大彎矩。船體波頻運(yùn)動對上部最大彎矩有較大影響,隨著波頻響應(yīng)的周期和幅值的變化,上部最大彎矩變化較快,而低頻響應(yīng)的則主要影響隔水管上部彎矩。

    鉆井隔水管;深水;船體運(yùn)動;非線性動力

    U674.38+1

    A

    王 騰(1973-),男,博士,中國石油大學(xué)海洋工程系教授,主要從事海洋工程方面的教學(xué)和科研工作;

    朱為全(1981-),男,中國石油大學(xué)海洋工程系碩士研究生,主要從事深水立管非線性振動響應(yīng)分析。

    U674.38+1

    A

    1007-7294(2010)06-0606-13

    date:2009-02-16

    Supported by a grant from the National Hi-Tech “863” Plan Fund(2006AA09A106)

    張修占(1983-),男,中國石油大學(xué)海洋工程系碩士研究生,主要從事深水立管非線性振動響應(yīng)分析;

    猜你喜歡
    工程系石油大學(xué)深水
    砥礪奮進(jìn)中的西南石油大學(xué)法學(xué)院
    砥礪奮進(jìn)中的西南石油大學(xué)法學(xué)院
    識人需要“涉深水”
    電子信息工程系
    機(jī)電工程系簡介
    穿行:服裝工程系畢業(yè)設(shè)計(jì)作品
    東北石油大學(xué)簡介
    深水區(qū)醫(yī)改設(shè)計(jì)者
    西安航空學(xué)院專業(yè)介紹
    ———動力工程系
    ??诟鄱谏钏a頭正式對外啟用
    水道港口(2013年2期)2013-04-27 14:14:16
    久久精品国产亚洲av涩爱| 中文字幕人妻丝袜一区二区 | 伦理电影免费视频| 日韩人妻精品一区2区三区| 精品人妻熟女毛片av久久网站| 欧美97在线视频| 韩国高清视频一区二区三区| 老司机深夜福利视频在线观看 | 高清黄色对白视频在线免费看| 国产成人午夜福利电影在线观看| 中文字幕制服av| 丝袜美足系列| 久久久久精品国产欧美久久久 | 最近中文字幕2019免费版| 亚洲少妇的诱惑av| 日韩 亚洲 欧美在线| 午夜老司机福利片| 成人毛片60女人毛片免费| 国产免费现黄频在线看| 久久av网站| 亚洲国产毛片av蜜桃av| 国产成人欧美| 人妻人人澡人人爽人人| 久久99热这里只频精品6学生| 精品久久蜜臀av无| 99香蕉大伊视频| 亚洲精品一二三| 99久久人妻综合| 麻豆精品久久久久久蜜桃| 天天躁日日躁夜夜躁夜夜| 欧美另类一区| 久久这里只有精品19| 国产精品国产三级专区第一集| 成年人免费黄色播放视频| 久久久精品免费免费高清| 亚洲图色成人| 国产精品久久久久久精品电影小说| 国产男女超爽视频在线观看| 又黄又粗又硬又大视频| 两个人看的免费小视频| 午夜老司机福利片| av在线观看视频网站免费| 成人亚洲欧美一区二区av| 国产一卡二卡三卡精品 | 九色亚洲精品在线播放| 黑人猛操日本美女一级片| xxx大片免费视频| 99精品久久久久人妻精品| 亚洲精品aⅴ在线观看| 亚洲国产日韩一区二区| 欧美97在线视频| 日韩制服丝袜自拍偷拍| 亚洲三区欧美一区| 日韩一区二区三区影片| 又黄又粗又硬又大视频| 99久国产av精品国产电影| 人妻人人澡人人爽人人| 在线观看免费高清a一片| 亚洲欧洲精品一区二区精品久久久 | 汤姆久久久久久久影院中文字幕| 波野结衣二区三区在线| 午夜免费男女啪啪视频观看| 国产成人午夜福利电影在线观看| 一个人免费看片子| 熟妇人妻不卡中文字幕| 国产精品99久久99久久久不卡 | 亚洲欧美激情在线| 日日摸夜夜添夜夜爱| 一级片'在线观看视频| 99精国产麻豆久久婷婷| 久热这里只有精品99| 丝袜喷水一区| 亚洲成人一二三区av| 国产精品免费视频内射| 亚洲婷婷狠狠爱综合网| 久久久久人妻精品一区果冻| 精品久久蜜臀av无| 国产一区二区在线观看av| 国产一区二区三区av在线| 日韩,欧美,国产一区二区三区| 女人爽到高潮嗷嗷叫在线视频| 日本爱情动作片www.在线观看| svipshipincom国产片| 日韩大片免费观看网站| 国产极品粉嫩免费观看在线| 哪个播放器可以免费观看大片| 亚洲精品自拍成人| 国产av精品麻豆| 人人妻人人澡人人爽人人夜夜| 日韩,欧美,国产一区二区三区| 深夜精品福利| 日韩精品免费视频一区二区三区| 91成人精品电影| 韩国精品一区二区三区| 日韩一区二区三区影片| 欧美久久黑人一区二区| 成人手机av| 免费女性裸体啪啪无遮挡网站| 亚洲欧美色中文字幕在线| 一边摸一边抽搐一进一出视频| 热re99久久国产66热| xxxhd国产人妻xxx| 久久久精品94久久精品| 国产成人免费观看mmmm| 一级片免费观看大全| 精品福利永久在线观看| 国产成人精品久久久久久| av视频免费观看在线观看| 一区二区日韩欧美中文字幕| 国产精品久久久av美女十八| 涩涩av久久男人的天堂| 男人添女人高潮全过程视频| 国产淫语在线视频| 国产午夜精品一二区理论片| 一级爰片在线观看| 波多野结衣av一区二区av| 欧美黑人精品巨大| 亚洲精品日本国产第一区| 欧美 亚洲 国产 日韩一| 婷婷色综合www| 在现免费观看毛片| 成年人午夜在线观看视频| 午夜福利网站1000一区二区三区| 欧美人与善性xxx| 一本一本久久a久久精品综合妖精| 高清视频免费观看一区二区| 99国产精品免费福利视频| 日韩电影二区| 国产一卡二卡三卡精品 | 91老司机精品| 欧美中文综合在线视频| 成人国产av品久久久| 熟妇人妻不卡中文字幕| 国产不卡一卡二| 日韩中文字幕欧美一区二区| 国产成人精品无人区| 国产精品精品国产色婷婷| 18美女黄网站色大片免费观看| 亚洲精品久久国产高清桃花| 成人av一区二区三区在线看| 欧美国产精品va在线观看不卡| 日韩欧美在线二视频| 99久久综合精品五月天人人| 操美女的视频在线观看| 两人在一起打扑克的视频| 亚洲人成伊人成综合网2020| 欧美人与性动交α欧美精品济南到| 搡老妇女老女人老熟妇| 亚洲av日韩精品久久久久久密| 女性生殖器流出的白浆| 亚洲av成人av| 午夜a级毛片| 精品国产一区二区三区四区第35| 欧美在线黄色| 悠悠久久av| 一边摸一边做爽爽视频免费| 亚洲色图av天堂| 欧美乱色亚洲激情| 一本大道久久a久久精品| 无限看片的www在线观看| 中文字幕精品免费在线观看视频| 超碰成人久久| 国产精品国产高清国产av| 在线观看舔阴道视频| 韩国av一区二区三区四区| 久久精品亚洲精品国产色婷小说| 日韩国内少妇激情av| 熟妇人妻久久中文字幕3abv| 一级毛片高清免费大全| 精品卡一卡二卡四卡免费| 熟妇人妻久久中文字幕3abv| 曰老女人黄片| 又紧又爽又黄一区二区| 亚洲欧美日韩另类电影网站| 妹子高潮喷水视频| 午夜精品国产一区二区电影| 男人舔女人的私密视频| 日韩精品青青久久久久久| 久久久久久人人人人人| 乱人伦中国视频| 亚洲精品在线观看二区| www.自偷自拍.com| 国产三级在线视频| 无遮挡黄片免费观看| 国产真人三级小视频在线观看| 国产不卡一卡二| 岛国视频午夜一区免费看| 黄色女人牲交| 88av欧美| 久久精品国产清高在天天线| 欧美日韩精品网址| 成人国产综合亚洲| 欧美成人午夜精品| 日日爽夜夜爽网站| 日韩大尺度精品在线看网址 | 欧美午夜高清在线| 777久久人妻少妇嫩草av网站| 窝窝影院91人妻| 91在线观看av| 91九色精品人成在线观看| 最好的美女福利视频网| 日本欧美视频一区| 少妇被粗大的猛进出69影院| 99国产精品免费福利视频| 免费看美女性在线毛片视频| 啪啪无遮挡十八禁网站| a级毛片在线看网站| 电影成人av| 给我免费播放毛片高清在线观看| 69精品国产乱码久久久| 十分钟在线观看高清视频www| 国产亚洲欧美精品永久| 国产精品一区二区免费欧美| 中文字幕av电影在线播放| 亚洲国产日韩欧美精品在线观看 | 国产在线精品亚洲第一网站| 久久午夜综合久久蜜桃| 正在播放国产对白刺激| 黄片播放在线免费| 一级毛片精品| 男男h啪啪无遮挡| 91九色精品人成在线观看| 亚洲午夜理论影院| 9热在线视频观看99| 久久婷婷成人综合色麻豆| 黑人巨大精品欧美一区二区蜜桃| 亚洲美女黄片视频| 日韩欧美一区二区三区在线观看| 国产一区二区三区综合在线观看| 91成年电影在线观看| 亚洲av第一区精品v没综合| 久久精品成人免费网站| 亚洲一卡2卡3卡4卡5卡精品中文| 国产成人av教育| 精品久久久久久成人av| 成人欧美大片| 国产精品乱码一区二三区的特点 | 免费观看精品视频网站| 黄片播放在线免费| 精品国产乱子伦一区二区三区| netflix在线观看网站| 国产精品98久久久久久宅男小说| 日本黄色视频三级网站网址| 12—13女人毛片做爰片一| 精品久久久久久,| 宅男免费午夜| www.999成人在线观看| videosex国产| 18禁美女被吸乳视频| 午夜精品在线福利| aaaaa片日本免费| 国产精品 欧美亚洲| 看免费av毛片| 精品久久久精品久久久| 麻豆成人av在线观看| 国产男靠女视频免费网站| 精品人妻在线不人妻| 女生性感内裤真人,穿戴方法视频| а√天堂www在线а√下载| 最近最新免费中文字幕在线| 人人妻人人澡人人看| 日本在线视频免费播放| 高潮久久久久久久久久久不卡| 欧美 亚洲 国产 日韩一| 女性被躁到高潮视频| 成人特级黄色片久久久久久久| 老熟妇仑乱视频hdxx| 欧美av亚洲av综合av国产av| 日本精品一区二区三区蜜桃| 国产三级黄色录像| 亚洲av熟女| 又大又爽又粗| 18禁黄网站禁片午夜丰满| 1024视频免费在线观看| 国产欧美日韩综合在线一区二区| 亚洲精品国产一区二区精华液| 国产aⅴ精品一区二区三区波| 成人欧美大片| 老司机在亚洲福利影院| 成人av一区二区三区在线看| 国产精品香港三级国产av潘金莲| www.999成人在线观看| 国产av精品麻豆| 啪啪无遮挡十八禁网站| av超薄肉色丝袜交足视频| 欧美日韩福利视频一区二区| 午夜精品久久久久久毛片777| 亚洲国产欧美一区二区综合| 国产极品粉嫩免费观看在线| 丰满人妻熟妇乱又伦精品不卡| 中文字幕高清在线视频| 亚洲欧美精品综合一区二区三区| 少妇粗大呻吟视频| 妹子高潮喷水视频| 日本五十路高清| 日韩欧美三级三区| 亚洲精品中文字幕一二三四区| 午夜精品久久久久久毛片777| 法律面前人人平等表现在哪些方面| 欧美最黄视频在线播放免费| 欧美绝顶高潮抽搐喷水| 一区二区三区激情视频| 日本免费一区二区三区高清不卡 | 日韩欧美三级三区| 日韩 欧美 亚洲 中文字幕| 国产黄a三级三级三级人| 亚洲精品久久国产高清桃花| 精品久久蜜臀av无| 亚洲中文日韩欧美视频| 夜夜看夜夜爽夜夜摸| 国产一区在线观看成人免费| 亚洲精品美女久久av网站| av超薄肉色丝袜交足视频| 女人被狂操c到高潮| 中文字幕av电影在线播放| 侵犯人妻中文字幕一二三四区| 亚洲精品在线美女| 亚洲 国产 在线| 日韩欧美三级三区| 夜夜爽天天搞| 国产成人一区二区三区免费视频网站| 91大片在线观看| 成人精品一区二区免费| 激情视频va一区二区三区| 国产在线观看jvid| 久久久久久大精品| 99精品久久久久人妻精品| 在线播放国产精品三级| 国产激情欧美一区二区| 国产精品亚洲一级av第二区| 神马国产精品三级电影在线观看 | 精品一区二区三区av网在线观看| 好看av亚洲va欧美ⅴa在| 国产高清视频在线播放一区| 美女大奶头视频| 午夜福利免费观看在线| 久久性视频一级片| 免费看十八禁软件| 欧美在线一区亚洲| 一本久久中文字幕| 亚洲一区高清亚洲精品| 热re99久久国产66热| 亚洲av片天天在线观看| 韩国av一区二区三区四区| 欧美不卡视频在线免费观看 | 精品久久久久久,| 亚洲精品一区av在线观看| 国产欧美日韩一区二区三| 亚洲欧美一区二区三区黑人| 欧美色视频一区免费| 在线播放国产精品三级| 久久精品亚洲熟妇少妇任你| 波多野结衣高清无吗| 亚洲男人天堂网一区| 男女下面插进去视频免费观看| 男人操女人黄网站| 国产激情久久老熟女| 精品久久久精品久久久| 淫妇啪啪啪对白视频| 在线观看66精品国产| 午夜a级毛片| 日韩欧美三级三区| 人成视频在线观看免费观看| 中文字幕色久视频| 美国免费a级毛片| 此物有八面人人有两片| 88av欧美| 久久精品成人免费网站| 精品午夜福利视频在线观看一区| 国产成人欧美在线观看| 中文字幕久久专区| 757午夜福利合集在线观看| 无遮挡黄片免费观看| 日本 av在线| 日韩欧美免费精品| 久99久视频精品免费| 最新美女视频免费是黄的| 在线观看66精品国产| 男人舔女人下体高潮全视频| 91av网站免费观看| 久久久精品国产亚洲av高清涩受| 国产精品野战在线观看| 夜夜看夜夜爽夜夜摸| 国产真人三级小视频在线观看| 亚洲精品国产精品久久久不卡| 国产亚洲精品久久久久5区| 亚洲成a人片在线一区二区| 9191精品国产免费久久| 欧美一区二区精品小视频在线| 国产欧美日韩精品亚洲av| 久久久久九九精品影院| 久久热在线av| 日韩成人在线观看一区二区三区| 嫁个100分男人电影在线观看| 又黄又粗又硬又大视频| 亚洲男人天堂网一区| 国产精品亚洲av一区麻豆| 亚洲中文字幕日韩| av在线天堂中文字幕| 国产日韩一区二区三区精品不卡| 久久欧美精品欧美久久欧美| 亚洲五月天丁香| 一级毛片精品| 日韩精品免费视频一区二区三区| 欧美乱妇无乱码| 50天的宝宝边吃奶边哭怎么回事| 身体一侧抽搐| 欧美日本中文国产一区发布| 成年人黄色毛片网站| 我的亚洲天堂| 丝袜美足系列| 成人国产一区最新在线观看| 亚洲精品粉嫩美女一区| 国产欧美日韩综合在线一区二区| 91麻豆av在线| 50天的宝宝边吃奶边哭怎么回事| 亚洲成人免费电影在线观看| 99热只有精品国产| 亚洲色图 男人天堂 中文字幕| 国产精品电影一区二区三区| 亚洲精品中文字幕在线视频| 黄色视频不卡| 国产精品久久久久久精品电影 | 国产亚洲欧美98| 免费在线观看日本一区| 亚洲成人久久性| 国产一区二区在线av高清观看| 中文字幕人妻熟女乱码| 看免费av毛片| 一进一出抽搐gif免费好疼| 国产精品久久久久久精品电影 | 国产亚洲欧美精品永久| 9热在线视频观看99| 国产精品久久久人人做人人爽| 久久久久久久精品吃奶| 国产高清videossex| 妹子高潮喷水视频| 亚洲精品久久成人aⅴ小说| 久99久视频精品免费| 精品久久久精品久久久| 婷婷精品国产亚洲av在线| 国产成人影院久久av| xxx96com| 麻豆久久精品国产亚洲av| 久久中文字幕一级| 精品久久蜜臀av无| 在线十欧美十亚洲十日本专区| 国产三级在线视频| 超碰成人久久| 亚洲精品国产区一区二| 黑丝袜美女国产一区| av片东京热男人的天堂| 一级毛片高清免费大全| 欧美一区二区精品小视频在线| 成人亚洲精品一区在线观看| 美女 人体艺术 gogo| 在线播放国产精品三级| 日韩中文字幕欧美一区二区| 精品乱码久久久久久99久播| av福利片在线| 亚洲va日本ⅴa欧美va伊人久久| 波多野结衣av一区二区av| 久久天躁狠狠躁夜夜2o2o| 精品一区二区三区av网在线观看| 99久久久亚洲精品蜜臀av| 女性生殖器流出的白浆| 老司机午夜福利在线观看视频| 午夜激情av网站| 欧美一区二区精品小视频在线| 一个人免费在线观看的高清视频| 老司机午夜十八禁免费视频| 欧美大码av| 神马国产精品三级电影在线观看 | 老司机在亚洲福利影院| 人人妻人人爽人人添夜夜欢视频| 精品国产一区二区久久| 亚洲国产精品合色在线| 一区福利在线观看| 一区二区三区精品91| 亚洲欧美日韩高清在线视频| 男人舔女人的私密视频| 18禁美女被吸乳视频| 最近最新中文字幕大全电影3 | 女人被躁到高潮嗷嗷叫费观| 成人免费观看视频高清| 国产亚洲欧美精品永久| 在线观看www视频免费| 日韩视频一区二区在线观看| 成人手机av| 亚洲精品国产色婷婷电影| 久久香蕉精品热| 成在线人永久免费视频| 美女扒开内裤让男人捅视频| 动漫黄色视频在线观看| av有码第一页| 亚洲第一欧美日韩一区二区三区| 欧美激情久久久久久爽电影 | 精品国产乱码久久久久久男人| 国内毛片毛片毛片毛片毛片| 亚洲成国产人片在线观看| 色综合婷婷激情| 久久国产精品男人的天堂亚洲| 国产成人影院久久av| 亚洲av成人一区二区三| 婷婷六月久久综合丁香| 可以在线观看的亚洲视频| 久久久久国产精品人妻aⅴ院| 亚洲男人天堂网一区| 欧美黄色淫秽网站| 午夜两性在线视频| 视频区欧美日本亚洲| 精品日产1卡2卡| 亚洲中文字幕一区二区三区有码在线看 | 免费在线观看视频国产中文字幕亚洲| 在线观看一区二区三区| 久久午夜亚洲精品久久| 黄片播放在线免费| 亚洲精品在线美女| or卡值多少钱| 日本三级黄在线观看| 国产成人欧美| cao死你这个sao货| 人人澡人人妻人| 老司机在亚洲福利影院| 久久久久久国产a免费观看| 色综合欧美亚洲国产小说| 超碰成人久久| 18禁国产床啪视频网站| 亚洲一码二码三码区别大吗| 窝窝影院91人妻| 国产精品影院久久| 高清黄色对白视频在线免费看| 两人在一起打扑克的视频| 中文亚洲av片在线观看爽| 99国产综合亚洲精品| 久久影院123| 国产精品99久久99久久久不卡| 欧美在线黄色| 可以在线观看的亚洲视频| 一二三四在线观看免费中文在| www.999成人在线观看| 欧美一级毛片孕妇| 色哟哟哟哟哟哟| 男女之事视频高清在线观看| 国内精品久久久久精免费| 欧美在线黄色| 无人区码免费观看不卡| 欧美激情久久久久久爽电影 | 午夜福利欧美成人| 久久久国产成人免费| 变态另类成人亚洲欧美熟女 | 成人欧美大片| 最好的美女福利视频网| 亚洲一区中文字幕在线| 制服丝袜大香蕉在线| 两性午夜刺激爽爽歪歪视频在线观看 | 久久久久久国产a免费观看| 国产精品野战在线观看| 国产三级黄色录像| 亚洲国产欧美网| 99国产综合亚洲精品| 欧美绝顶高潮抽搐喷水| 精品免费久久久久久久清纯| 国产伦一二天堂av在线观看| а√天堂www在线а√下载| 亚洲国产精品合色在线| 最近最新免费中文字幕在线| 老司机在亚洲福利影院| 一级,二级,三级黄色视频| 少妇 在线观看| 桃红色精品国产亚洲av| 不卡一级毛片| 日韩有码中文字幕| 欧美亚洲日本最大视频资源| 欧美日韩一级在线毛片| 日韩精品青青久久久久久| 女人精品久久久久毛片| 乱人伦中国视频| 久久久国产成人精品二区| 美女午夜性视频免费| 亚洲国产精品久久男人天堂| 国产精品免费一区二区三区在线| av天堂久久9| 天堂动漫精品| 一级毛片女人18水好多| 99国产精品免费福利视频| 精品久久久久久久人妻蜜臀av | 欧美成狂野欧美在线观看| 好男人电影高清在线观看| 无人区码免费观看不卡| 涩涩av久久男人的天堂| 美女扒开内裤让男人捅视频| 免费av毛片视频| 成人18禁高潮啪啪吃奶动态图| 国产精品一区二区三区四区久久 | 夜夜夜夜夜久久久久| 大型黄色视频在线免费观看| 久久久国产成人精品二区| 欧美黑人精品巨大| 国产日韩一区二区三区精品不卡| 亚洲精品国产精品久久久不卡| 亚洲国产日韩欧美精品在线观看 | 欧美日本亚洲视频在线播放| 亚洲精品国产一区二区精华液| 国产91精品成人一区二区三区| 国产激情欧美一区二区| 欧美日韩亚洲综合一区二区三区_| 免费在线观看视频国产中文字幕亚洲| 老鸭窝网址在线观看| 亚洲一区二区三区色噜噜| 午夜老司机福利片| 国产又爽黄色视频| 久久国产精品人妻蜜桃| 琪琪午夜伦伦电影理论片6080| 久久精品亚洲精品国产色婷小说|