渗流

Mathematic model is studied to describe unstable water injection development for Middle East Paleocene reservoir with characteristics of pressure sensitivity and high difference of formation-saturation pressures.

为了定量研究具有压敏特点的中东地区古新世高地饱压差油藏不稳定注水开发的数学模型，通过静水力学方法和单轴实验的方法，对中东地区古新世岩心渗透率随围压变化的规律进行实验研究；结合黑油模型的假设条件，推导了此类油藏不稳定注水渗流的全新数学模型。

The parabolic partial differential equation is an important type of mathematical physical equations. It can describe the problems of heat conduction, seepage flow and diffusion, et al.

抛物型偏微分方程是描述热传导、渗流、扩散等过程的一类重要的数学物理方程。

On the basis of the conservation equation of continuous medium and in combination with mechanics of fluid through porous media and the heat transfer theory in porous media, conservation equations in porous media (continuous equation, momentum equation and energy equation ) are derived, When constructing the downhole temperature model, heat transfer in a wellbore is considered as the heat transfer in a vertical tube, the flow in a wellbore considered as sufficiently parallel flow, heat transfer in injection zones considered as heat conduction and convection in porous media, the flow in injection zones considered as flow through porous media, heat transfer in adjacent rocks considered as heat conduction in porous media.

在建立井下温度场模型时，把井筒的传热看作是竖直圆管中传热问题，把井筒的流动看作是充分发展的层流流动；把注入层中的传热看作是多孔介质中导热和对流的传热问题，把注入层中的流动看作是渗流；把围岩中的传热看作是多孔介质中导热问题。

Three parameters were considered in this new model,i.e, the average rate of fluid through every crack,the number density of cracks in per unit volume and the extent of cracks＇ penetrance.

笔者在此基础上建立起一个新的渗流模型，着重考虑了3个因素，即：流体通过每一裂隙面的平均流量；单位体积内裂隙的数密度；裂隙贯通程度。

In scientific terms, the process is no longer percolation, but extraction.

在科学计算，过程不再是渗流，但提取。

The study on the percolation mechanism of low-permeability gas reservoirs is conducive to establish reasonable and effective development policies.

研究低渗透气藏的渗流机理，有利于制订合理、有效的开发方案。

The study on the percolation mechanism of lowpermeability gas reservoirs is conducive to establish reasonable and effective development policies.

研究低渗透气藏的渗流机理，有利于制订合理、有效的开发方案。

The study indicates that gas percolation is controlled by permeability and water saturation.

研究发现，气体渗流受渗透率和含水饱和度的控制。

On the basis of the predecessors' research work, a mathematical model of non-linear percolation in gas reservoir is developed, and a case is given in this paper.

基於前人的研究成果，建立了一个考虑启动压力梯度和介质变形的气藏非线性渗流的数学模型，最后给出了计算实例。

The first three chapters of this thesis deal with the percolation model on latticefractals.

本文前三章研究了格点分形图上的渗流模型。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。