• <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 ?

    Deepwater gas kick simulation with consideration of the gas hydrate phase transition*

    2014-06-01 12:30:00WANGZhiyuan王志遠(yuǎn)SUNBaojiang孫寶江
    關(guān)鍵詞:志遠(yuǎn)

    WANG Zhi-yuan (王志遠(yuǎn)), SUN Bao-jiang (孫寶江)

    School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China, E-mail: wangzy1209@126.com

    Deepwater gas kick simulation with consideration of the gas hydrate phase transition*

    WANG Zhi-yuan (王志遠(yuǎn)), SUN Bao-jiang (孫寶江)

    School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China, E-mail: wangzy1209@126.com

    (Received January 8, 2013, Revised March 26, 2013)

    The hydrate phase transition presents new problems and challenges for the deepwater well control in the drilling processes. A simulation model is built for deepwater gas kicks with consideration of the hydrate phase transition. The model is based on the multiphase flow governing equations and the hydrate phase transition calculation equations. The influence of the hydrate phase transition on the gas kick hydraulics is investigated through numerical simulations. It is shown that the diameter of the gas bubbles can significantly influence the hydrate phase transition effect. The influence of the hydrate phase transition on the gas kick hydraulics increases with the decrease of the average gas bubble diameter. The hydrate phase transition adds a “hidden” nature for the well kick in deepwater and hinders the early detection of the gas kick. The influence of the hydrate phase transition on the gas kick hydraulics is also studied in the case when the hydrate inhibitor is added to the drilling fluid.

    deepwater, gas kick, simulation, gas hydrate, phase transition

    Introduction

    The hydrocarbon resource in the offshore deepwater environment is one of important energy resources. In the deepwater drilling process, when the hydraulic pressure in the wellbore is below the drilling formation pressure, the formation fluids would flow into the wellbore. When the formation fluid is the vapour phase hydrocarbon, it is termed the gas kick in the industry, which can potentially cause a catastrophic well control event. Furthermore, the gas in the well annulus forms solid hydrates in the interval of low temperature and high pressure. The hydrates travel upward with the carrying fluids (drilling mud) along the well annulus. Once the hydrates are out of the hydrate formation region, they are disassociated into the vapour phase. The hydrate phase transition presents new challenges for deepwater drilling[1]. If the hydrates are not handled properly, we might face the well blowout and offshore pollution problems. The deepwater gas kick simulation is a possible way to determine the multiphase flow behaviour with consideration of the hydrate phase transition.

    Nunes et al.[2]established a kick analytical model and iteratively calculated the pressure distribution and the gas-liquid percentages in the well annulus and the choke line at each time step at a constant flow rate. Avelar et al.[3]proposed a set of deepwater kick simulation methods and analyzed the effect of the depth on the well control parameters. Johnny et al.[4]studied the hydrate formation potential and obtained the overcooled pressure of the hydrate formation in the well annulus using an advanced dynamic kick simulator. Wang et al.[5]presented a method for predicting the gas hydrate formation region in the deep-water well annulus. Yapa et al.[6]modelled underwater oil/gas jets and plumes with consideration of the gas hydrate formation and decomposition. Wang and Sun[7]established a deepwater gas kick model and conducted preliminary studies on the influence of the hydrate formation on kick flow parameters.

    Although some progresses were made in deepwater gas kick simulations, few previous studies con-sidered the influence of the hydrate phase transition on the gas kick hydraulics, which is a major problem in deepwater drilling and well control. In this study, a simulation model is established for the gas kick in the deepwater well annulus with consideration of the hydrate phase transition. The influences of the hydrate phase transition on the deepwater gas kick hydraulics are analysed using numerical calculations.

    1. Gas kick model with the gas hydrate phase transition in well annulus

    1.1Multiphase flow governing equations considering the gas hydrate phase transition

    Three components in the well annulus are usually considered, including the gas, the drilling fluid and the cuttings, where the mass and momentum conservation equations are used. However, the gases in the well annulus can form hydrate particles when they are transported into low-temperature and high-pressure regions, particularly near the seafloor, in the deepwater well annulus. The hydrate particles are lighter than the drilling fluids and will travel upward with the drilling fluids and the cuttings, and then disassociate after they leave the hydrate formation region. The hydrate phase transitions make the behaviour of the multiphase flow in the deepwater well differ from that in the well onshore or in the shallow water. In this study, we establish an improved annular multiphase flow governing equations by coupling the hydrate phase transition by adding the hydrate mass conservation equation, the hydrate term in the momentum conservation equation and the enthalpy term for the gas hydrate phase transition in the heat conservation equations.

    The following assumptions are made when the governing equations are derived.

    (1) The seawater temperature field is continuous and the formation temperature field varies linearly with the depth at a constant geothermal gradient from the mudline.

    (2) The water-based drilling fluid is used, and no mass transfer occurs between the natural gas and the drilling fluid.

    (3) The hydrates in the form of solid particles travel upward with the drilling fluid, neglecting the hydrate attachment on the well annulus or riser wall.

    (4) The hydrate particles will not be split into two or more parts during the hydrate formation or disassociation process.

    Based on the above assumptions, the annular multiphase flow governing equations with consideration of the hydrate phase transition, for the mass conservation, the momentum conservation, and the heat conservation, are obtained. The mass conservation equations of gases, hydrates, drilling fluids, and cuttings are as follows: whereρg,ρm,ρHandρcare the densities of the gas, the drilling fluids, the hydrates, and the cuttings, respectively,vg,vm,vHandvcare the velocities of the gas, the drilling fluids, the hydrates and the cuttings in the well annulus, respectively,Eg,Em,EHandEcare the volume fraction of the produced gas, the drilling fluids, the hydrates and the cuttings,Ais the annular cross-sectional area,qgis the gas production rate of unit length of formation,xgis the mass fraction of the gas in the hydrate,rHis the hydrate formation/decomposition rate of unit length in the well annulus, with its positive or negative value representing the formation or disassociation of the hydrates. andqcis the cutting production rate per unit length.

    Equation (2) is the hydrate mass conservation equation. The final terms on the right-hand side of Eqs.(1) and (3) represent the gas and water mass gain/ loss terms due to the hydrate disassociation/formation, respectively.

    The momentum conversation equations of the gases, the hydrates, the drilling fluids, and the cuttings are as follows whereαrepresents the well deviation angle,pfrepresents the annular friction, andprepresents the annular pressure.

    The hydrate phase transition is often accompanied by a heat exchange. The hydrate formation is anexothermic process[8], whereas the hydrate disassociation is an endothermic process[9]. Therefore, the enthalpy term for the gas hydrate phase transition, the third term in the left-hand side of Eq.(6), should be considered in the heat conservation equations. The heat conservation equations in the deepwater well annulus can be expressed as follows

    whereρlis the density of the liquid,wg,wlare the mass flow rates of the gas and liquid phases, respectively,Cg,Clare the specific heats of the gas and liquid phases, respectively,Tei,Ta,Ttare the temperatures of the formation, the well annulus and the drill string, respectively, and ΔHHis the enthalpy of the gas hydrate phase transition, which can be calculated using the Clausius-Clapeyron equation.A',B' are the intermediate coefficients. The expression ofB' is

    The deepwater well annulus section above the seabed is a riser surrounded by seawater and that below the seabed is surrounded by the formation, and the expression for these two sessions are defined as

    wherekeis the coefficient of heat transfer of the hydrate formation,rcois the casing external diameter,Uais the overall heat transfer coefficient of the annular fluid and the formation, andTDis a function of the transient heat transfer[11],his the well depth,Hsis the water depth.

    Because only the drilling fluid flows in the drill string, the temperature field equation can be expressed in a relatively simple manner as follows

    wheretArepresents the inner cross-sectional area of the drilling pipe.

    1.2Auxiliary equations

    Many previous studies considered the auxiliary equations for the multiphase flow in the well annulus, such as the flow pattern transition equations[12], the gas slip velocity equations, the fluid phase behaviour equations, and the flow friction calculation equations. In this study, we focus on the auxiliary equations related to the hydrate phase transition. These equations involve the hydrate phase equilibrium condition, the hydrate formation rate, and the hydrate disassociation rate.

    (1) The hydrate phase equilibrium conditions. The first issue is to identify the conditions under which the hydrates form/decompose. In this paper, the hydrate phase equilibrium conditions refer to the temperature and pressure conditions in the well annulus. A chemical potential balance is established among the aqueous phase, the gas phase, and the hydrate lattice system in the crystal structure of the hydrates. The equations for the hydrate phase equilibrium conditions are based on the thermodynamic equilibrium theory[13].

    where Δμ0is the difference between chemical potentials in the unoccupied lattice and the pure water in the reference state,Ris the gas constant,T0is the reference temperature,THis the hydrate-formation temperature, ΔH0is the difference between enthalpies in the unoccupied lattice and the pure water, ΔCKis the difference between the heat capacities in the unoccupied lattice and the pure water,pHis the hydrateformation pressure, ΔVis the molar volume differe-nce between the unoccupied lattice and the pure water,fwis the fugacity of water in the solution, Pascal,fwris the fugacity of water in the reference state (TH,pH), Pascal,lis the total number of hydrate species,Miis the ratio of the number of typeicavities to the number of water molecules in the hydrate phase,Lis the total number of gas types,θijis the fraction of thei-type cavities occupied by aj-type gas molecule,xwis the mole fraction of water; andywis the water activity coefficient in the solution.

    (2) Calculation of the hydrate formation rate.

    Englezos et al.[14]suggested two gas hydrate formation processes. The first process is the diffusion of the natural gas dissolved in the liquid into the hydrateliquid interface. The second process is the structural framework combination between gas and water molecules at the interface. Englezos proposed a method to calculate the hydrate growth rate from the aforementioned processes. The main formulas for the calculation of the hydrate formation rate are as follows:

    wherenis the hydrate formation rate,μnis thenth moment and the initialnth moment of the crystal distribution,Ag-lis the gas-liquid interface area,ais the gas-liquid interface area per unit liquid volume,Cwois the initial concentration of water molecules,Dis the mass transfer coefficient for gas in the dispersion film,fgis the gas fugacity,fbis the fugacity of the dissolved gas in water,feqis the three-phase equilibrium fugacity,yLis the thickness of the film at the gas-liquid interface,His the Henry’s law constant,γis the Hatta number, andGis an average growth rate for the computation of the first and second moments,Kis the combined rate parameter of hydrate formation.

    The hydrate formation region is usually near the seabed in the deepwater well annulus. The diameter of the gas bubbles is usually small because of the high pressure in the hydrate formation region. The number of gas bubbles is an important factor for calculating the hydrate formation rate per unit length in an annulus. The gas bubbles are assumed as the volume-equivalent spheres. The number of gas bubbles per unit length in the annulus can be described as

    whereNgis the number of gas bubbles of unit length in the annulus andDgis the initial mean diameter of the gas bubbles as they reach the hydrate formation region.

    Hinze[15]and Winterton[16]calculated the maximum and mean bubble diameters using the following Eqs.(19) and (20) to determine the diameter range of the gas bubbles when they reach the hydrate formation region in the deepwater well annulus.

    wheremaxDis the maximum bubble diameter,σis the surface tension,εis the energy dissipation rate per unit mass[15], andDis the diameter of the annulus.

    The hydrate growth rate for one gas bubble can be calculated using Eqs. (13)-(17). The equation of the hydrate formation rate of unit length in an annulus is as follows

    whereHMis the molar weight of the hydrate.

    (3) Calculation of the hydrate decomposition rate. Kim et al.[17]proposed a hydrate decomposition dynamic model including the following two parts: (1) the deconstruction process of the cage lattice structure of the hydrate particle surface and (2) the desorption process of guest molecules from the surface. The calculation formulas for the hydrate decomposition rate are as follows:

    wherenHis the total moles of CH4contained in hydrate particles,Asis the surface area of one hydrate particle, ΔEis the activation energy, 78.3 kJ/mol for CH4,kdis the hydrate decomposition rate constant.

    (4) The slip velocity of hydrate particles

    The hydrate particles are buoyant due to their low density (e.g., 900 kg/m3 for methane hydrate). The slip velocity of the gas bubbles and the hydrate particles is, according to Zheng and Yapa[18],

    wherevTis the slip velocity of the gas bubble or the hydrate particle,μis the viscosity of drilling fluid,ρmis the drilling fluid density,dis the diameter of the gas bubble or the hy drate particle,Ris the Reynolds number and Cliftprovided a correlation forRas

    whereρdis the density of the gas bubbles or the hydrate particles.

    Equations (24)-(30) can also be applied to calculate the slip velocity between the gas bubble and the hydrate shell whenρdin Eq.(29) is considered as the composite density of the bubbles and the hydrate shell (ρcom). The composite density of the bubbles with the hydrate shell is then

    whereρcomis the composite density of the bubble with hydrate shell,Rhis the initial radius of the gas bubble, andRbis the radius of the gas bubble with hydrate shell, which can be calculated easily from the hydrate growth rate.

    1.3Conditions of temperature field simulation

    (1) Initial conditions. In the drilling process, when the fluid flow state in the annulus changes because of the gas invasion, the initial condition of the transient temperature field is equivalent to the temperature calculated under the steady-state conditions before the gas enters the annulus.

    (2) Boundary conditions. The inlet temperature of the drill string can be measured directly as follows

    The temperature of the liquid in the drill string is similar to the liquid in the annulus at the well bottom, and can be expressed as

    The seawater temperature field can be expressed as

    wherehsis some depth in the seawater,Tseais the seawater temperature at the depthhs,T0is the seawater temperature at the surface, andfTseais a function of the seawater temperature.

    The formation temperature field can be expressed as

    whereTGis the formation temperature at some depth,Kgardis the geothermal gradient.

    Table 1 Basic data

    1.4Conditions of pressure field simulation

    (1) Initial conditions. Before the gas enters into the annulus, there are only the drilling fluids in the annulus. Then,

    whereVscis the apparent velocity of the cuttings,Ccis the velocity distribution factor,Vmmis the velocity of the mixture,Vcris the slippage velocity of the cuttings,Qmis the drilling fluid circulation rate, andQcis the volumetric flow rate of the cuttings.

    (2) Boundary conditions

    wherespis the casing pressure.

    2. Results of the deepwater gas kick simulation with hydrate phase transition

    The HG-X well in the South China Sea is used as an example to analyse the influence of the hydrate phase transition on the annulus flow parameters when a deepwater gas kick occurs. The well data are summarized in Table 1. The kick occurs during the drilling process and the invaded gas is methane.

    2.1Sensitivity study for bubble diameters

    The hydrate formation/disassociation rate is affected by the diameter of bubbles in the gas-liquid mixture because the bubble diameter is related to the gasliquid interface area. The maximum and mean bubble diameters are approximately 0.030 m and 0.009 m in the hydrate formation region, respectively, according to Eqs.(19) and (20). Thus, the gas bubble diameters are assumed in the range of 0.005 m-0.030 m to study the influence of the gas bubble diameter on the gas kick hydraulics, including the gas volume fraction, the pit gain, the bottom hole pressure and the shut-in casing pressure.

    Fig.1 Hydrate formation region in well annulus during drilling

    (1) The hydrate formation region in the annulus during the gas kick period. The hydrate formation region in the annulus can be determined from the hydrate phase equilibrium conditions and using the annulus temperature and pressure field calculation method. Figure 1 shows the hydrate formation region in the annulus during drilling for the case with no hydrate inhibitor added into the drilling fluid. The depth range enclosed by the hydrate phase equilibrium and the annulus temperature curves mark the hydrate formation region. In this case, the hydrate formation region is in the range of 600 m to 1 470 m. The temperature difference between the two curves in the closed region at the same depth is equivalent to the overcooled temperature for the hydrate formation. The hydrate formation region becomes larger when the closed region is longer in the vertical direction. On the other hand, the hydrate formation rate increases when the closed region is wider in the lateral direction.

    Fig.2(a) Gas volume fraction profiles at 95 min during gas kick

    Fig.2(b) Gas fraction profiles at 95 min during gas kick

    (2) The influence of the hydrate phase transition on the gas volume fraction during the gas kick period. Figures 2(a) and 2(b) show the gas fraction profiles in the annulus at the gas production rates of 0.15 Nm3/(MPa·s) and 1.0 Nm3/(MPa·s), respectively. The figures show that the gas volume fractions are different in cases with and without consideration of the hydrate phase transition. The influence of the hydrate phase transition on the gas volume fraction increases with the decrease of the average gas bubble diameter (Dg), because the smaller the gas bubbles diameters are at certain gas volume fractions, the larger the gasliquid interface areas will be, consequently, the hydrate formation rate will be increased. As seen in Fig.2(b), the ratios of the gas volume fractions with and without the hydrate phase transition are 0.26, 0.50, 0.62, 0.79, and 0.87 at a depth of 1 000 m and with bubble diameters of 0.005 m, 0.0075 m, 0.01 m, 0.02 m, and 0.03 m, respectively. The gas volume fraction curve has an inflection at points A and B, which are the lower and upper boundaries of the hydrate formation region, respectively. The gas volume fraction decreases when the gas enters the hydrate formation region because of the hydrate formation. Moreover, point A is near the mud line. The cross-sectional area of the riser section above the mud line is larger than the well annulus area. The sudden increase of the cross-sectional area reduces the gas volume fraction. The gas volume fraction increases when the gas leaves the hydrate formation region because of the hydrate disassociation. The hydrate formation would consume large amounts of gas and reduce the annular gas volume fraction, giving the deepwater kicks a “hidden” nature.

    Fig.3(a) Curve of pit gain versus kick time with different gas bubble diameters

    Fig.3(b) Curve of pit gain versus kick time with different gas bubble diameters

    (3) The influence of the hydrate phase transition on the pit gain during the gas kick period. Figures 3(a) and 3(b) show the pit gain versus the kick time at gas production rates of 0.15 Nm3/(MPa·s) and1.0 Nm3/(MPa·s), respectively. Each pit gain curve can be divided into three parts by points A and Bi(i=0,1,…5). Prior to point A, the invaded gas has not reached the hydrate formation region in the annulus, and thus, the pit gain curves with different bubble diameters are overlapped. When the gas enters the hydrate formation region (between A and Bi), the pit gain curves begin deviate from each other, and the deviation becomes larger over time because the hydrate formation consumes different amounts of gas. After point Bi, the front of the multiphase flow reaches the surface and some gase escapes from the annulus, which leads to the slow pit gain growth. The influence of the hydrate phase transition on the pit gain increases with the decreasing bubble diameter. The hydrate phase transition reduces the pit gain and delays the detection of the well ki3ck. As observed in Fig.3(a), the pit gain reaches 1 m after 98 min when the hydrate phase transition is not considered. On3the other hand, the pit gain takes 124 min to reach 1 m when the average bubble diameter is 0.005 m and the hydrate phase transition is considered. Therefore, the detection of the well kick is delayed by 26 min. The delays in the well kick detection greatly increase the well control risks. Moreover, the hydrate is more likely to be present in an annulus at a low gas production rate than at the high gas production rate when the gas kick is detected by using the pit gain monitoring equipment with certain preci3sions. For example, when the pit gain reaches 1 m, the gas would reach the hydrate formation region as shown in Fig.3(a) but not reach the hydrate formation region as shown in Fig.3(b).

    Fig.4 Curve of bottom hole pressure versus kick time with different gas bubble diameters

    (4) The influence of the hydrate phase transition on the bottom hole and shut-in casing pressures during the gas kick period. Figure 4 shows the curve of the bottom hole pressure versus the kick time. Figure 5 shows the curve of the shut-in casing pressure versus the kick time for different gas bubble diameters at the gas production rate of 1.0 Nm3/(MPa·s). As observed in these figures, the values of the bottom hole pressure and the shut-in casing pressure are dependent on the hydrate phase transition. The differences between the simulated results with and without the consideration of the hydrate phase transition increase with the decrease of the bubble diameter. The slopes of the curves decrease after point A (approximately 53 min) because the gas front enters the riser after 53 min and the section area of the riser is much larger than that of the annulus below the seafloor. Some wrong decision can be made when the degree of the gas kick or the type of invaded fluid is judged based on the pressure difference between the shut-in casing pressure and the shutin stand pressure because the hydrate phase transition reduces the shut-in pressure.

    Fig.5 Curve of shut-in casing pressure versus kick time with different gas diameters

    Fig.6 Hydrate formation regions with different methanol concentrations (Cm)

    2.2Result analysis of the deepwater gas kick simulations with different hydrate inhibitor concentrations

    Methanol is a common hydrate inhibitor. Figure 6 shows the hydrate formation region in the annulus with different methanol weight concentrations (Cm). The hydrate phase curves gradually move downward and the hydrate formation regions become smaller when the methanol concentration increases. Moreover, no hydrate is formed in the annulus when the methanol inhibitor concentration reaches 8% weight concentration. The hydrate formation regions and the hydrate overcooled temperatures decrease with the addition of inhibitors, consequently the hydrate formation ratesare decreased. Figure 7 shows the formation rate of the single bubble (diameter of 0.01 m) with different methanol concentrations (Cm) in the hydrate formation region. The hydrate formation rate decreases with the increase of the methanol concentration. Moreover, the maximum value of the hydrate formation rate with 5% methanol weight concentration is 1/7 of that without inhibitors being added.

    Fig.7 The single bubble’s formation rate with different methanol concentrations (Cm), when the bubble diameter is 0.01 m

    Fig.8 Gas fraction profiles with different methanol concentrations at 95 min during gas kick

    Fig.9 Pit gain versus kick time with different methanol concentrations

    The influence of the hydrate phase transition on the gas kick hydraulics, such as the gas volume fraction, the pit gain, is studied when the gas invasion rate is 0.10 Nm3/(MPa·s) and the average bubble diameter is 0.01 m. Figures 8 and 9 show the simulated results. The influence of the hydrate phase on the aforementioned parameters decreases with the increase of the methanol concentration. However, the influence of the hydrate phase transition on the flow parameters disappears when the methanol inhibitor weight concentration reaches 8%. As shown in Fig.8, the maximum overcooled temperature for the hydrate formation, the temperature difference between the annulus temperature curve and the hydrate phase equilibrium state curve (Cm=0) at depth of 1 057 m, is 6.2oC. Using the method proposed by Yamanlar et al.[19], the methanol weight concentration can be calculated as 7.6%, which is very close to the value 8% found in this study.

    The effect of the inhibitor concentration on the gas kick hydraulics should be considered in the deepwater gas kick simulations to better understand the deepwater gas kick process and provide guidances for future well control implementations.

    3. Conclusions

    A simulation model for deepwater gas kicks that accounts for the hydrate phase transition is established. The model is based on the improved annular multiphase flow governing equations and the hydrate phase transition calculation equations. The improved annular multiphase flow governing equations are derived by coupling the hydrate phase transition via adding the hydrate mass conservation equation, the hydrate term in the momentum conservation equation and the enthalpy term for the gas hydrate phase transition in the heat conservation equations. The model can be used quantitatively determine the relationship between the gas kick hydraulic parameters, such as the pit gain, the gas volume fraction, the bottom hole pressure and the shut-in casing pressure, versus the kick time and the impact of some hydrate inhibitor added into the drilling fluid.

    In the gas kick process, the gas bubble diameter can significantly influence the hydrate phase transition effect. Both the gas volume fraction in the annulus and the pit gain would be reduced because of the hydrate phase transition, which gives the well kicks in deepwater a “hidden” nature and increases the difficulty of the early detection of gas kicks. The hydrate phase curves gradually move downwards, and the hydrate formation region decreases when the hydrate inhibitor concentration increases. The hydrate overcooled temperature decreases and the hydrate formation rate and the influence of the hydrate phase transition on gas kick hydraulics are decreased. The influence of the hydrate phase transition on the kick parameters disappears when the methanol inhibitor weight concentration reaches 8% in this study.

    References

    [1] FOSSIL B., SANGESLAND S.. Managed pressure drilling for subsea applications: Well control challenges in deep waters[C]. SPE/IADC Underbalanced Technology Conference and Exhibition, 91633. Houston, Texas, USA, 2004.

    [2] NUNES J. O. L., BANNWART A. C. and RIBEIRO P. R. Mathematical model of a gas kick in deep water scenario[C]. IADC/SPE Asia Pacific Drilling Technology. Jakarta, Indonesia, 2002.

    [3] AVELAR C., RIBEIRO P. R. and SEPEHMOORI K. Deep-water gas kick simulation[J]. Journal of Petroleum Science and Engineering, 2009, 67(1-2): 13-22.

    [4] JOHNNY P., KNUT S. B. and KNUT L. Computing the danger of hydrate formation using a modified dynamic kick simulator[C]. SPE/IADC Drilling Conference. Amsterdam, The Netherlands, 2001.

    [5] WANG Z., SUN B. and CHENG H. Prediction of gas hydrate formation region in the well-bore of deepwater drilling[J]. Petroleum Exploration Development, 2008, 35(6): 731-735.

    [6] YAPA P. D., ZHENG L. and CHEN F. A model for deepwater oil/gas blowouts[J]. Marine Pollution Bulletin, 2001, 43(7): 234-241.

    [7] WANG Z., SUN B. Multiphase flow behavior in annulus with solid gas hydrate considering nature gas hydrate phase transition[J]. Petroleum Science, 2009, 6(1): 57-63.

    [8] JIANG G., WU Q. and ZHAN J. Experimental studies of the formation and dissociation of methane hydrate in loess[J]. Journal of Natural Gas Chemistry, 2010, 19(3): 217-223.

    [9] FAN S., ZHANG Y. and TIAN G. et al. Natural gas hydrate dissociation by presence of ethylene glycol[J]. Energy Fuels, 2006, 20(1): 324-326.

    [10] HAGOORT J. Prediction of wellbore temperatures in gas production wells[J]. Journal of Petroleum Science and Engineering, 2005, 49(1-2): 22-36.

    [11] HAGOORT J. Ramey’s wellbore heat transmission revisited. SPE Journal, 2004, 9(4): 465-474.

    [12] ZHANG H. Q., WANG Q. and SARICA C. et al. Unified model for gas-liquid pipe flow via slug dynamics-Part 1: Model development[J]. Journal of Energy Resources Technology, 2003, 125(4): 266-273.

    [13] JAVANMARDI J., MOSHFEGHIAN M. A new approach for prediction of gas hydrate formation conditions in aqueous electrolyte solutions[J]. Fluid Phase Equilibria, 2000, 168(2): 135-148.

    [14] ENGLEZOS P., KALOGERAKIS N. and DHOLABHAI P. D. et al. Kinetics of formation of methane and ethane gas hydrates[J]. Chemical Engineering Science, 1987, 42(11): 2647-2658.

    [15] HINZE J. O. Fundamentals of the hydrodynamic mechanism of splitting in dispersion processes[J]. AIChE Journal, 1955, 1(3): 289-295.

    [16] WINTERTON R. H. S. A simple method of predicting bubble size in bubble columns[J]. Chemical Engineering and Processing: Process Intensification, 1994, 33(1): 1-5.

    [17] KIM H. C., BISHNOI P. R. and HEIDEMANN R. A. et al. Kinetics of methane hydrate decomposition[J]. Chemical Engineering Science, 1987, 42(7): 1645-1653.

    [18] ZHENG L., YAPA P. D. Buoyant velocity of spherical and non-spherical bubbles/droplets[J]. Journal of Hydraic Engineering ASCE, 2000, 126(11): 825-854.

    [19] YAMANLAR S., POETTMANN F. H. and SLOAN E. D. Control hydrate formation[J]. Hydrocarbon Processing, 1991, 70(9): 155-161.

    10.1016/S1001-6058(14)60011-1

    * Project supported by the National Natural Science Foundation of China (Grant No. 51104172), the National Science and Technology Major Project of China (Grant No. 2011ZX05026-001) and the National High Technology Research and Development Program of China (863 Program, Grant No. 2013AA09A215).

    Biography: WANG Zhi-yuan (1981-), Ph. D.,

    Associate Professor

    猜你喜歡
    志遠(yuǎn)
    Corrigendum to“Atomic-scale electromagnetic theory bridging optics in microscopic world and macroscopic world”
    Atomic-scale electromagnetic theory bridging optics in microscopic world and macroscopic world
    禹志遠(yuǎn)作品
    大眾文藝(2022年24期)2023-01-09 09:27:16
    Topological photonic states in gyromagnetic photonic crystals:Physics,properties,and applications
    Quantum mechanical solution to spectral lineshape in strongly-coupled atom-nanocavity system
    呼志遠(yuǎn)美術(shù)作品
    我最喜愛(ài)的玩具①
    Atom interferometers with weak-measurement path detectors and their quantum mechanical analysis?
    香噴噴的年喲
    Functional Equivalence Theory and Its Limitations in Translation
    學(xué)周刊(2015年1期)2015-07-09 22:04:00
    少妇丰满av| av福利片在线观看| 国产精品1区2区在线观看.| 亚洲电影在线观看av| 身体一侧抽搐| 精品国产超薄肉色丝袜足j| 99视频精品全部免费 在线 | 国产亚洲av嫩草精品影院| 欧美乱妇无乱码| 午夜精品久久久久久毛片777| 亚洲欧美激情综合另类| 色av中文字幕| 久久午夜综合久久蜜桃| 精品久久久久久久人妻蜜臀av| 国产伦一二天堂av在线观看| 在线观看66精品国产| 日韩免费av在线播放| 美女免费视频网站| 日韩欧美三级三区| 亚洲狠狠婷婷综合久久图片| 两个人视频免费观看高清| 亚洲色图 男人天堂 中文字幕| 欧美黄色片欧美黄色片| 色综合站精品国产| 性色av乱码一区二区三区2| 亚洲五月婷婷丁香| aaaaa片日本免费| 久久久久精品国产欧美久久久| 一区二区三区国产精品乱码| 两性午夜刺激爽爽歪歪视频在线观看| 黑人巨大精品欧美一区二区mp4| 日韩免费av在线播放| 精品国产三级普通话版| 久久香蕉国产精品| 狠狠狠狠99中文字幕| 精品欧美国产一区二区三| 精品日产1卡2卡| 窝窝影院91人妻| 国产毛片a区久久久久| 99久久久亚洲精品蜜臀av| 18禁黄网站禁片免费观看直播| 99热只有精品国产| 国产精品自产拍在线观看55亚洲| a在线观看视频网站| 国产97色在线日韩免费| 国产人伦9x9x在线观看| 韩国av一区二区三区四区| 三级男女做爰猛烈吃奶摸视频| 日韩欧美国产一区二区入口| 久久亚洲精品不卡| 九色成人免费人妻av| 一夜夜www| 精品欧美国产一区二区三| 狂野欧美激情性xxxx| 精品久久久久久久久久免费视频| 美女被艹到高潮喷水动态| 手机成人av网站| 日韩欧美 国产精品| 欧美在线黄色| 国产一区二区在线av高清观看| 亚洲性夜色夜夜综合| a在线观看视频网站| 女人被狂操c到高潮| 淫妇啪啪啪对白视频| 亚洲va日本ⅴa欧美va伊人久久| 国内精品美女久久久久久| 婷婷精品国产亚洲av在线| 国产蜜桃级精品一区二区三区| 亚洲国产欧洲综合997久久,| 色吧在线观看| 最近视频中文字幕2019在线8| 免费人成视频x8x8入口观看| 欧美日韩福利视频一区二区| 校园春色视频在线观看| 国产精品野战在线观看| 色老头精品视频在线观看| 好男人电影高清在线观看| 午夜a级毛片| 国产精品爽爽va在线观看网站| 亚洲精品久久国产高清桃花| 热99re8久久精品国产| 免费看日本二区| 怎么达到女性高潮| 激情在线观看视频在线高清| 18禁观看日本| 男女做爰动态图高潮gif福利片| 久久久久久大精品| 99久久无色码亚洲精品果冻| 在线观看免费午夜福利视频| 久久伊人香网站| 在线观看舔阴道视频| 九九在线视频观看精品| 欧美又色又爽又黄视频| 黄片小视频在线播放| 精品免费久久久久久久清纯| 99精品久久久久人妻精品| 久久久久国产一级毛片高清牌| 欧美大码av| 日韩欧美在线乱码| 亚洲熟女毛片儿| 国产精品久久久av美女十八| 久久精品影院6| 久久天躁狠狠躁夜夜2o2o| av片东京热男人的天堂| svipshipincom国产片| 无限看片的www在线观看| 日本免费一区二区三区高清不卡| 久久精品aⅴ一区二区三区四区| 国产黄a三级三级三级人| 中亚洲国语对白在线视频| x7x7x7水蜜桃| 真实男女啪啪啪动态图| 搞女人的毛片| 大型黄色视频在线免费观看| 在线永久观看黄色视频| 免费观看人在逋| 一进一出抽搐动态| 亚洲天堂国产精品一区在线| 国产精品99久久久久久久久| 熟女电影av网| 18禁黄网站禁片免费观看直播| 亚洲av电影在线进入| 日韩高清综合在线| 国产成人aa在线观看| 久久国产精品人妻蜜桃| 久久精品亚洲精品国产色婷小说| 色哟哟哟哟哟哟| 在线观看一区二区三区| 久久中文字幕人妻熟女| 男人和女人高潮做爰伦理| 性欧美人与动物交配| 99精品在免费线老司机午夜| 国产精品1区2区在线观看.| 精华霜和精华液先用哪个| 久久精品影院6| 99riav亚洲国产免费| 欧美中文日本在线观看视频| 狂野欧美激情性xxxx| 黄色丝袜av网址大全| 少妇熟女aⅴ在线视频| 婷婷精品国产亚洲av| 午夜福利在线在线| 九色成人免费人妻av| 欧美成狂野欧美在线观看| 99热这里只有精品一区 | 免费看a级黄色片| 国产av不卡久久| 日韩高清综合在线| 成熟少妇高潮喷水视频| 国产午夜精品论理片| 男人舔奶头视频| 日韩欧美三级三区| 中国美女看黄片| 精品日产1卡2卡| 日韩国内少妇激情av| 亚洲乱码一区二区免费版| 色综合站精品国产| 亚洲色图 男人天堂 中文字幕| 中出人妻视频一区二区| 91在线观看av| 国产三级中文精品| 日韩三级视频一区二区三区| 给我免费播放毛片高清在线观看| 欧美3d第一页| 色综合婷婷激情| 两个人的视频大全免费| 色吧在线观看| 欧美xxxx黑人xx丫x性爽| 欧美一级毛片孕妇| 国产熟女xx| 欧美一区二区精品小视频在线| 国产成年人精品一区二区| 国产成人精品无人区| 免费看日本二区| 国产午夜精品论理片| 村上凉子中文字幕在线| 精品国产乱码久久久久久男人| 国产麻豆成人av免费视频| 日韩大尺度精品在线看网址| 国产视频一区二区在线看| 久久亚洲精品不卡| 黄频高清免费视频| 午夜激情福利司机影院| 丁香六月欧美| 国产精品综合久久久久久久免费| 亚洲精品色激情综合| 一边摸一边抽搐一进一小说| 亚洲国产中文字幕在线视频| 在线观看舔阴道视频| 欧美日本亚洲视频在线播放| or卡值多少钱| 99热6这里只有精品| 小蜜桃在线观看免费完整版高清| 我的老师免费观看完整版| 亚洲精品色激情综合| 国模一区二区三区四区视频 | av欧美777| 69av精品久久久久久| 最新在线观看一区二区三区| 久久精品国产综合久久久| 国产av在哪里看| 国产成年人精品一区二区| 欧美成狂野欧美在线观看| 亚洲在线观看片| 欧美日韩综合久久久久久 | 国产精品免费一区二区三区在线| 丝袜人妻中文字幕| 久久久国产成人精品二区| 色综合婷婷激情| 午夜影院日韩av| 亚洲av第一区精品v没综合| 99久国产av精品| 国产精品一区二区三区四区免费观看 | 久久久成人免费电影| 又大又爽又粗| 久久午夜综合久久蜜桃| 日韩中文字幕欧美一区二区| 亚洲av免费在线观看| 精品欧美国产一区二区三| 丁香六月欧美| 久久欧美精品欧美久久欧美| 午夜福利免费观看在线| 国产日本99.免费观看| 一本综合久久免费| 午夜影院日韩av| 日韩av在线大香蕉| 亚洲男人的天堂狠狠| 亚洲精品一卡2卡三卡4卡5卡| 国产私拍福利视频在线观看| 中国美女看黄片| 国产精品久久电影中文字幕| 亚洲色图av天堂| 美女免费视频网站| 免费人成视频x8x8入口观看| 欧美另类亚洲清纯唯美| 亚洲色图av天堂| 久久精品国产清高在天天线| 亚洲五月婷婷丁香| 一级毛片女人18水好多| 亚洲专区中文字幕在线| 精品乱码久久久久久99久播| 给我免费播放毛片高清在线观看| 啦啦啦观看免费观看视频高清| 午夜福利高清视频| 综合色av麻豆| x7x7x7水蜜桃| 欧美日韩瑟瑟在线播放| 国产精品免费一区二区三区在线| 99riav亚洲国产免费| 免费在线观看日本一区| 国产极品精品免费视频能看的| 变态另类丝袜制服| 美女 人体艺术 gogo| 一本综合久久免费| 午夜福利欧美成人| 午夜福利在线观看吧| 精品一区二区三区av网在线观看| 亚洲成人久久性| 国产精品爽爽va在线观看网站| 日韩有码中文字幕| 久久久久久久久中文| 久久天躁狠狠躁夜夜2o2o| 99久久国产精品久久久| 国产亚洲精品一区二区www| 欧美在线黄色| 嫩草影院入口| 欧美国产日韩亚洲一区| av天堂中文字幕网| 国产精品一区二区三区四区久久| 最近在线观看免费完整版| 91老司机精品| 国产三级中文精品| 亚洲欧美一区二区三区黑人| 色尼玛亚洲综合影院| 午夜福利在线观看免费完整高清在 | 香蕉丝袜av| 蜜桃久久精品国产亚洲av| 九九在线视频观看精品| 麻豆国产97在线/欧美| xxxwww97欧美| 欧美日韩瑟瑟在线播放| 丰满人妻一区二区三区视频av | 日韩av在线大香蕉| 午夜久久久久精精品| 日本黄色视频三级网站网址| 99精品欧美一区二区三区四区| 国产真实乱freesex| 欧美日韩亚洲国产一区二区在线观看| 亚洲欧美日韩东京热| 国产精品久久久久久亚洲av鲁大| 99热只有精品国产| 日本撒尿小便嘘嘘汇集6| 天天一区二区日本电影三级| 国产精品久久久久久精品电影| a在线观看视频网站| 国产激情偷乱视频一区二区| 欧美av亚洲av综合av国产av| 国产一区二区三区在线臀色熟女| e午夜精品久久久久久久| 亚洲国产精品合色在线| 中文字幕人妻丝袜一区二区| 久久久久性生活片| 老熟妇乱子伦视频在线观看| 国产高清视频在线观看网站| 成人av在线播放网站| 国产伦在线观看视频一区| 精品国产三级普通话版| 亚洲欧美日韩高清专用| 国产亚洲精品一区二区www| 久久精品国产清高在天天线| 一进一出抽搐动态| 免费在线观看视频国产中文字幕亚洲| 精品国产美女av久久久久小说| 成人性生交大片免费视频hd| 一级毛片女人18水好多| 神马国产精品三级电影在线观看| 久久天躁狠狠躁夜夜2o2o| 精品国内亚洲2022精品成人| 97碰自拍视频| av视频在线观看入口| 亚洲人成网站高清观看| 神马国产精品三级电影在线观看| 成人午夜高清在线视频| 精品一区二区三区av网在线观看| 欧美日本亚洲视频在线播放| 精品免费久久久久久久清纯| 国产成人av激情在线播放| 亚洲欧美日韩无卡精品| 男插女下体视频免费在线播放| 亚洲一区二区三区不卡视频| 国产精品久久久人人做人人爽| 美女 人体艺术 gogo| 国产精品1区2区在线观看.| 久久久久久国产a免费观看| 久久草成人影院| 一区二区三区激情视频| 综合色av麻豆| 国产精品永久免费网站| 日本免费一区二区三区高清不卡| 亚洲aⅴ乱码一区二区在线播放| 伦理电影免费视频| 午夜福利在线在线| 久久久久国内视频| 午夜日韩欧美国产| 草草在线视频免费看| bbb黄色大片| 黄色成人免费大全| 舔av片在线| xxx96com| 亚洲 国产 在线| 精品久久久久久久末码| 看片在线看免费视频| 搡老岳熟女国产| 一本一本综合久久| 亚洲最大成人中文| 99在线人妻在线中文字幕| 校园春色视频在线观看| 大型黄色视频在线免费观看| 99国产精品一区二区蜜桃av| 两个人看的免费小视频| 久久精品人妻少妇| 色精品久久人妻99蜜桃| netflix在线观看网站| 久久精品国产亚洲av香蕉五月| 美女 人体艺术 gogo| 国产视频一区二区在线看| 深夜精品福利| 中出人妻视频一区二区| 在线观看66精品国产| 国产精品av久久久久免费| 精品一区二区三区av网在线观看| av国产免费在线观看| 欧美日韩福利视频一区二区| 婷婷亚洲欧美| 国产三级黄色录像| 成人18禁在线播放| 亚洲精品一区av在线观看| 国产精华一区二区三区| 亚洲自偷自拍图片 自拍| 中文字幕人妻丝袜一区二区| 亚洲av电影不卡..在线观看| 一进一出抽搐gif免费好疼| 母亲3免费完整高清在线观看| 午夜日韩欧美国产| 亚洲av美国av| 精品久久蜜臀av无| 悠悠久久av| 麻豆av在线久日| 国产亚洲精品综合一区在线观看| 香蕉av资源在线| 国产97色在线日韩免费| 一区二区三区激情视频| 国产高清有码在线观看视频| 国产伦精品一区二区三区四那| 99久久精品热视频| 国产日本99.免费观看| 999精品在线视频| 最近最新免费中文字幕在线| 欧美高清成人免费视频www| 88av欧美| 亚洲国产精品久久男人天堂| 欧美又色又爽又黄视频| 亚洲成av人片免费观看| www日本在线高清视频| 久久久久久久午夜电影| av黄色大香蕉| 丁香欧美五月| 国产精品美女特级片免费视频播放器 | 亚洲av片天天在线观看| 精品乱码久久久久久99久播| 亚洲avbb在线观看| 亚洲av成人不卡在线观看播放网| 男插女下体视频免费在线播放| 亚洲欧美日韩东京热| 天天添夜夜摸| 免费观看精品视频网站| 精品国产美女av久久久久小说| 特大巨黑吊av在线直播| av中文乱码字幕在线| 精品欧美国产一区二区三| 日本成人三级电影网站| 日本a在线网址| 中文字幕av在线有码专区| 88av欧美| 国内久久婷婷六月综合欲色啪| 无遮挡黄片免费观看| 午夜精品久久久久久毛片777| 色老头精品视频在线观看| 中文字幕熟女人妻在线| 国产探花在线观看一区二区| 色综合亚洲欧美另类图片| 一卡2卡三卡四卡精品乱码亚洲| 国产精品久久久久久亚洲av鲁大| 好男人在线观看高清免费视频| 欧美日韩综合久久久久久 | a在线观看视频网站| 免费在线观看视频国产中文字幕亚洲| 久久精品综合一区二区三区| 欧美国产日韩亚洲一区| 少妇丰满av| e午夜精品久久久久久久| 亚洲专区中文字幕在线| tocl精华| 亚洲熟女毛片儿| 国产精品 国内视频| 亚洲午夜精品一区,二区,三区| 最近视频中文字幕2019在线8| 精品国产乱子伦一区二区三区| 久久中文看片网| 黄色丝袜av网址大全| 一a级毛片在线观看| 性欧美人与动物交配| 又粗又爽又猛毛片免费看| 亚洲欧美日韩高清专用| 精品国产亚洲在线| 又大又爽又粗| 一个人看的www免费观看视频| 给我免费播放毛片高清在线观看| 99精品在免费线老司机午夜| 亚洲,欧美精品.| 国产精品 欧美亚洲| 男女下面进入的视频免费午夜| 亚洲人成伊人成综合网2020| 每晚都被弄得嗷嗷叫到高潮| 麻豆av在线久日| 国产精品一区二区精品视频观看| 亚洲av第一区精品v没综合| 国产伦一二天堂av在线观看| 嫩草影院精品99| 国产亚洲精品综合一区在线观看| 久久精品综合一区二区三区| 99精品在免费线老司机午夜| 国产成人福利小说| 国产精品电影一区二区三区| 国产高清视频在线观看网站| 久久人妻av系列| 国产免费av片在线观看野外av| 欧洲精品卡2卡3卡4卡5卡区| avwww免费| 国产单亲对白刺激| 国产男靠女视频免费网站| 女警被强在线播放| 国产高潮美女av| 在线观看日韩欧美| 老汉色∧v一级毛片| 成年人黄色毛片网站| 亚洲成人免费电影在线观看| 十八禁人妻一区二区| 亚洲熟女毛片儿| 国产亚洲av嫩草精品影院| 精品一区二区三区视频在线观看免费| 性色avwww在线观看| 欧美日韩综合久久久久久 | 成年人黄色毛片网站| 小说图片视频综合网站| 欧美xxxx黑人xx丫x性爽| 小说图片视频综合网站| 欧美xxxx黑人xx丫x性爽| 午夜两性在线视频| 日本一二三区视频观看| 亚洲成人免费电影在线观看| 美女cb高潮喷水在线观看 | 国产欧美日韩一区二区精品| 999精品在线视频| 在线观看日韩欧美| 国产乱人视频| 免费在线观看成人毛片| 国产三级在线视频| 欧美黄色淫秽网站| 天天躁狠狠躁夜夜躁狠狠躁| 性欧美人与动物交配| 亚洲成人中文字幕在线播放| 成熟少妇高潮喷水视频| 亚洲片人在线观看| 久久伊人香网站| 国产精品一及| 九色国产91popny在线| 日本精品一区二区三区蜜桃| 午夜精品一区二区三区免费看| 亚洲精品美女久久久久99蜜臀| 一级毛片精品| 成人特级av手机在线观看| 色综合婷婷激情| 免费大片18禁| 又黄又爽又免费观看的视频| 日韩av在线大香蕉| 精品不卡国产一区二区三区| 亚洲性夜色夜夜综合| 99国产精品一区二区三区| 日韩欧美免费精品| www日本在线高清视频| 色精品久久人妻99蜜桃| 中文亚洲av片在线观看爽| 禁无遮挡网站| 身体一侧抽搐| 国产麻豆成人av免费视频| 人人妻,人人澡人人爽秒播| 日本黄色片子视频| 亚洲国产精品sss在线观看| 精品99又大又爽又粗少妇毛片 | 欧美xxxx黑人xx丫x性爽| 亚洲 欧美 日韩 在线 免费| 午夜福利视频1000在线观看| 国产高潮美女av| 亚洲欧美激情综合另类| 亚洲自拍偷在线| 成人亚洲精品av一区二区| 少妇丰满av| 最新美女视频免费是黄的| 亚洲熟妇熟女久久| 黑人操中国人逼视频| 黄频高清免费视频| 国产精品1区2区在线观看.| 亚洲成av人片免费观看| 91字幕亚洲| 免费看日本二区| 国产蜜桃级精品一区二区三区| 午夜精品一区二区三区免费看| 琪琪午夜伦伦电影理论片6080| 在线观看舔阴道视频| 日日干狠狠操夜夜爽| 女同久久另类99精品国产91| 成人性生交大片免费视频hd| 日本与韩国留学比较| 人妻久久中文字幕网| 国产91精品成人一区二区三区| 精品国内亚洲2022精品成人| 成在线人永久免费视频| 两性午夜刺激爽爽歪歪视频在线观看| 国产精品 国内视频| 亚洲18禁久久av| 可以在线观看毛片的网站| 俄罗斯特黄特色一大片| 成人高潮视频无遮挡免费网站| www.www免费av| 国产精品综合久久久久久久免费| 桃色一区二区三区在线观看| 国产真人三级小视频在线观看| 国产aⅴ精品一区二区三区波| 99在线人妻在线中文字幕| 欧美乱码精品一区二区三区| 母亲3免费完整高清在线观看| 成年女人看的毛片在线观看| 国产真实乱freesex| 久久久国产欧美日韩av| 国产久久久一区二区三区| 男女床上黄色一级片免费看| 亚洲av成人一区二区三| 欧美zozozo另类| 欧美日韩黄片免| 国产日本99.免费观看| 欧美在线黄色| 国产在线精品亚洲第一网站| 久久久久久久午夜电影| 成人高潮视频无遮挡免费网站| 桃红色精品国产亚洲av| 国产精品久久久久久亚洲av鲁大| 午夜福利成人在线免费观看| 国产私拍福利视频在线观看| 一级毛片高清免费大全| 性色av乱码一区二区三区2| 国产黄片美女视频| 亚洲色图 男人天堂 中文字幕| 又粗又爽又猛毛片免费看| 一卡2卡三卡四卡精品乱码亚洲| 中文字幕人妻丝袜一区二区| 欧美日韩国产亚洲二区| 一边摸一边抽搐一进一小说| 日韩欧美 国产精品| www国产在线视频色| 美女黄网站色视频| 国产亚洲精品综合一区在线观看| 色播亚洲综合网| 夜夜看夜夜爽夜夜摸| 99久久精品国产亚洲精品|