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切向应力
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  “切向应力”译为未确定词的双语例句
    As the quality of filtrate cake influences the change of formation pore pressure near the borehole, thus how the filtrate cake quality affect on the radial stress, axial stress, surrounding stress and shearing stress is analyzed quantitatively.
    滤饼质量直接影响到井壁附近地层的孔隙压力 ,定量地分析了滤饼质量对井周地层径向应力、切向应力、轴向应力和剪应力的影响。
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    During the course of hydraulic fracturing in high permeability loose formation, the stability of fracture face will be destroyed by the shearing stress of fracturing fluid because of the formation’s poor cementation and low strength, thus causing the sand grains attached to the fracture face to be moved back to the fracture tip with fracturing fluid injection to form scour fractures.
    对高渗透松软地层进行水力压裂施工时,由于地层胶结程度差,强度低,压裂液对弱胶结裂缝壁面的切向应力就会破坏裂缝壁面的稳定性,使附着在裂缝壁面上的砂粒由静止变为运动,并随压裂液的注入而向缝端后移,形成冲刷裂缝;
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  share stress
In our model, AC trophism was dependent on share stress and direct loads more than on denervation.
      
When the traction force exceeds a maximum share stress of the soil, the soil fails to support the stress and starts to move loosely.
      


By means of test and analysis of the velocity field of liquid-liquid hydrocyclone,it is pointed out that the main radial forces on the dispersal droplets are centrifugal force caused by the tangent velocity field, radial force caned by the radial pressure field, radial moving resistance, i. e. Stoke's force, and Magnus force caused by the revolving of droplets in the field. The tangent stress and its effect on the separation of the liquid phase are analyzed. Relevant equations are given,which can be used to...

By means of test and analysis of the velocity field of liquid-liquid hydrocyclone,it is pointed out that the main radial forces on the dispersal droplets are centrifugal force caused by the tangent velocity field, radial force caned by the radial pressure field, radial moving resistance, i. e. Stoke's force, and Magnus force caused by the revolving of droplets in the field. The tangent stress and its effect on the separation of the liquid phase are analyzed. Relevant equations are given,which can be used to calculate the radial force of different diameter dispersal droplets under certain conditions.

通过对液一液水力旋流器速度场的测试与理论分析,指出分散相液滴在径向所受的力主要有:切向加速度产生的离心力,其方向远离轴心;径向压力场产生的径向力,其方向指向轴心;径向运动阻力──斯托克斯力,其方向指向器壁;旋转流场产生的马格纳斯为,其方向在外涡流区指向轴心,在内涡流区远离轴心。此外,分散相液滴在切向速度梯度影响下还受切向应力作用,使液滴破碎和乳化。依据给出的计算公式,可以计算各力的大小和方向,进而分析其对分离性能的影响。

The formation pore pressure is assumed as stable, while it changes in the surrounding formation of the hole during drilling, no matter it is over-balanced drilling or under-balanced drilling, thus deviations are produced on the borehole stress distribution and the safe range of drilling fluid density between the assumption and the real condition. As the quality of filtrate cake influences the change of formation pore pressure near the borehole, thus how the filtrate cake quality affect on the radial stress,...

The formation pore pressure is assumed as stable, while it changes in the surrounding formation of the hole during drilling, no matter it is over-balanced drilling or under-balanced drilling, thus deviations are produced on the borehole stress distribution and the safe range of drilling fluid density between the assumption and the real condition. As the quality of filtrate cake influences the change of formation pore pressure near the borehole, thus how the filtrate cake quality affect on the radial stress, axial stress, surrounding stress and shearing stress is analyzed quantitatively. The results show that with the improvement of filtrate cake quality, the supporting effect of drilling fluid column to borehole becomes more remarkable, and the anti-shearing and sloughing control capability also improve, thus the wellbore tends to be more stable. In addition, the contacting stress between formation fines increases also, and the tension fracturing resistance of rock becomes higher, with higher fracturing pressure detected; this also improves the stability of the borehole. The effect of filtrate cake quality on low permeable formation is especially remarkable.

无论是过平衡钻井 ,还是欠平衡钻井过程 ,都可能导致井周围地层孔隙压力改变 ,这样就使通过假定地层孔隙压力恒定而得到的井壁周围应力分布和地层的安全钻井液密度范围与实际偏离。滤饼质量直接影响到井壁附近地层的孔隙压力 ,定量地分析了滤饼质量对井周地层径向应力、切向应力、轴向应力和剪应力的影响。结果表明 :一方面随着滤饼质量的提高 ,井筒内钻井液液柱压力对井壁地层的支撑作用逐渐增强 ,井壁地层抗剪切垮塌的能力相应提高 ,井壁稳定性变好 ;另一方面 ,地层颗粒间的接触应力逐渐增大 ,岩石抵抗张性破裂的能力增强 ,地层的破裂压力提高 ,井壁稳定性变好。滤饼质量好坏对低渗透地层的影响尤其显著。

During the course of hydraulic fracturing in high permeability loose formation, the stability of fracture face will be destroyed by the shearing stress of fracturing fluid because of the formation’s poor cementation and low strength, thus causing the sand grains attached to the fracture face to be moved back to the fracture tip with fracturing fluid injection to form scour fractures. Meanwhile, the back-moving of sand grains by the action of hydraulic scour is favourable to the formation of “Tip-screen-out”...

During the course of hydraulic fracturing in high permeability loose formation, the stability of fracture face will be destroyed by the shearing stress of fracturing fluid because of the formation’s poor cementation and low strength, thus causing the sand grains attached to the fracture face to be moved back to the fracture tip with fracturing fluid injection to form scour fractures. Meanwhile, the back-moving of sand grains by the action of hydraulic scour is favourable to the formation of “Tip-screen-out” (TSO), which can also strengthen the hydraulic scour on the contrary. Such an interaction will control the size of fracture width and the efficiency of TSO-fracturing, thus having important value to scientific research. The existent fracture width prediction models are based on elastic theory, by which the fracture width can’t be exactly predicted, because the hydraulic scour phenomenon couldn’t be considered. In the paper, in consideration of rock mechanics, fluid mechanics, fracturing fluid property and fracturing operation conditions, the mechanism of forming scour fractures is analyzed; a new model of predicting the widths of hydraulic scour fractures (aiming at vertical fractures) is set up; the relevant calculation program is worked out; and the model is analyzed and checked up according to some actual data finally.

对高渗透松软地层进行水力压裂施工时,由于地层胶结程度差,强度低,压裂液对弱胶结裂缝壁面的切向应力就会破坏裂缝壁面的稳定性,使附着在裂缝壁面上的砂粒由静止变为运动,并随压裂液的注入而向缝端后移,形成冲刷裂缝;同时,砂粒在水力冲刷作用下的后移有利于“端部脱砂”产生,而“端部脱砂”的形成又加剧了水力冲刷作用强度,这种相互作用控制着缝宽的大小,影响着“端部脱砂”压裂施工的成败,因而具有很强的研究价值。现有的缝宽模型都以弹性理论为基础,并没有考虑该水力冲刷现象,因而不能准确地预测缝宽,文中综合考虑岩石力学、流体力学、压裂液性质以及压裂施工等理论,对该冲刷缝形成机理进行了分析,建立了一种新的针对垂直裂缝的水力冲刷缝宽预测模型,并编制了相应的计算程序,最后根据一些实际参数对该模型进行了分析验证。

 
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