ANALYTICAL SOLUTION OF PARTIAL DIFFERENTIAL EQUATIONS FOR RADIAL TRANSPORT OF A SOLUTE IN DOUBLE POROUS MEDIA

The mathematical model for radial transport of a solute is summed up in this paper.The action of non-equilibrium linear adsorption,the double property of porous media andthe decay of solute are considered.With the first kind of boundary condition,one finds theanalytical solution of these equations by Laplace transform and calculates thedimensionless solution by FORTRAN program with DJS-040.The distribution and changeof solute are evaluated and the solution under various limit cases is given.By numericalanalysis,one obtains some valuable conclusions.     

分枝水平井三维不定常渗流研究

描述了垂向有弱渗透补给的等强度持续点汇三维不定常渗流数学模型，用汇源积分等方法导出了平面上均匀分布的分枝水平井Ｇｒｅｅｎ函数型压力分布通式，计算并分析了其中主要参数影响特征，结合叠加原理给出了井壁压力计算方法和实际应用方法．     

3-D Fracture Propagation Simulation and Production Prediction in Coalbed

NｏｍｅｎｃｌａｔｕｒｅＡ(ｘ,ｔ)—Ｃｒｏｓｓ＿ｓｅｃｔｉｏｎａｒｅａｏｆｆｒａｃｔｕｒｅａｔｔｉｍｅｔａｎｄｓｉｔｅｘ,ｍ2 ;Ｂｇ,Ｂｗ —Ｃｏａｌｂｅｄｇａｓａｎｄｗａｔｅｒｖｏｌｕｍｅｆａｃｔｏｒ,ｄｉ ｍｅｎｓｉｏｎｌｅｓｓ;ｂ—Ｌａｎｇｍｕｉｒｆａｃｔｏｒ,(ＭＰａ) - 1 ;Ｃｇ,ＣＲ,Ｃｗ —Ｃｏａｌｂｅｄｇａｓ,ｒｏｃｋａｎｄｗａｔｅｒｃｏｍ ｐｒｅｓｓｉｂｉｌｉｔｙｃｏｅｆｆｉｃｉｅｎｔ,(ＭＰａ) - 1 ;Ｃｐ —Ｓａｎｄｒａｔｉｏ ,ｄｉｍｅｎｓｉｏｎｌｅｓｓ;Ｃｔ(ｘ ,ｔ)—Ｔｏｔａｌｆｒａｃｔｕｒｉｎ…     

煤层气井两相流试井分析方法

建立了煤层气井平面径向、两相流动试井的数学模型和数值模型,模型考虑了气体从基质中的解吸以及气、水在裂缝中的渗流、扩散等过程,考虑区域中的相变特性;提出结合运用遗传算法和高斯牛顿最优化方法,通过拟合井底压力曲线得到地层渗透率、表皮系数等试井参数的方法.     

双筒流变仪中粘弹性流体的解析解及运动特性分析

求得二阶流体和Maxwell流体在环管内不定常旋转运动问题的解析解.据此可以分析环管内旋转速度和切应力分布与变化特征.流体的物性常数、管道环隙大小等参数在解析公式中有明确反映,便于分析与讨论.本解可以用来分析类似的工程流动问题,尤其更具有针对性的是分析双筒流变仪中流动特征与应力状态,确定材料的粘弹性参数.通过计算,发现当外筒作简谐振动时,Maxwell流的速度和切应力变化曲线上有突变结,突变结上振幅和相位都发生突变.当外筒匀速旋转时,Maxwell流体的速度和切应力变化曲线分别呈斜方波和锯齿波形状.振动周期与材料常数H_a二次曲线相关.     

EXACT SOLUTION OF UNSTEADY AXISYMMETRICAL TWO-DIMENSIONAL FLOW THROUGH TRIPLE POROUS MEDIA

This paper seeks for the line source and cylindrical planesource solutions of unsteady axisymmetrical two-dimensionalflow through infinite and finite reservoirs with triple po-rosity.They not only reveal the essential characteristicsof fractured reservoirs but also generalize and develop theexisting primal results of homogeneous and porous media.Ref.[1]gives the line source solution of unsteady axi-symmetrical two-dimensional flow in infinite reservoir withdouble porosity;in this paper we study the problem of flowthrough triple porous media.     

Analytical solution of flow of second-order non-Newtonian fluids through annular pipes

This paper presents an analytical solution to the unsteady flow of the second-order non-Newtonian fluids by the use of intergral transformation method.Based on the numerical results,the effect of non-Newtonian coefficient Hc and other parameters on the flow are analysed.It is shown that the annular flow has a shorter characteristic time than the general pipe flow while the correspondent velocity,average velocity have a(?)aller value for a given Hc.Else,when radii ratio keeps unchanged,the shear stress of inner wall of annular flow will change with the inner radius compared with the general pipe flow and is always smaller than that of the outer wall.     

幂律流体在分形介质中不定常椭圆渗流

以椭圆渗流模型为基础,得到了分形油藏中,垂直裂缝井的幂律型非牛顿流体的定常渗流的压力分布公式和产量公式;并用数值差分的方法研究了分形油藏中,垂直裂缝井的不定常渗流,分析了分形参数对不定常压力的影响;同时从平均质量守恒方程出发,得到了相应的不定常渗流的近似解析解。分析表明:用椭圆渗流模型研究垂直裂缝井的渗流,大大简化了渗流问题的复杂性。