二项式方程

Based on the filtration theory, the deliverability test theory and model are discussed and the relationship between coefficient of the binomial deliverability equation and the penetration rate, depth of pay zones and skin factor are analyzed.

从渗流理论出发，阐明了产能试井的原理及模型，分析了二项式产能方程系数与渗透率、地层厚度和表皮系数的关系。

At present, the establishment of the binomial deliverability equation is based on a horizontal circular, equal thick and homogeneous gas reservoir model in which gas flows into well bottom in the form of radial flow.

目前二项式产能方程的建立是基于一种圆形水平、等厚和均质的气层，气体径向流入井底的模型。

Using binomial distribution P + Q = 1 to describe "succession attribute" of three suffered stand systems, the coefficients of 1, 3, 3, 1 in the binomial equation of3 will become assessment of probability in different attributes of systems.

对3个蠢害林分系统的"演变属性"用二项分布P+Q=1来描述，那么二项式3方程中的系数1、3、3、1成为系统中不同"演变属性"的概率论判断。

The binomial deliverability equation is the ordinary method of calculating the gas well′s open-flow capacity, the key is determining the coefficient.

气井二项式产能方程是计算气井无阻流量的常用方法，其关键在于确定系数值。

The article analyzes the dominant factor of gas well productivity based on absolute open flow potent and binomial deliverability equation.

结合气井绝对无阻流量定义及气井的二项式产能方程，对影响气井产能的井底污染、地层渗透率、地层压力、地层有效厚度、气井半径、泄气半径、天然气粘度、硫的沉积、气层产水等因素作了详细的分析。

After achieving the solution of the mathematical model,a binomial productivity equation of gas-water well with two-phase flow in formation was derived in consideration of the influence of formation damage and non-Darcy effect,thus establishing the theory of transient inflow performance relationship curve of gas-water well.

文章基于质量守恒原理，建立了气水两相地层瞬态渗流的数学模型，通过定义气水两相拟压力函数，将渗流数学模型线性化，在获得数学模型解后，考虑地层损害和非达西效应的影响，推导出在地层中为水气两相渗流的气水同产井的二项式产能方程，从而建立了气水同产井瞬态流入动态关系曲线的理论。

Horizontal gas well model considering well-bore structure parameters, turbulent flow under high-speed non-Darcy flow and start-up pressure gradient was established and solved. Binomial deliverability equation describing horizontal gas well was derived.

建立和求解了包含水平气井井身结构参数、近井区高速非达西渗流条件下气体紊流因素以及启动压力梯度效应的水平气井渗流模型，推导出了描述水平气井产能的二项式产能方程。

Assuming a condition cont-rol reserve calculation,combimatively solve the material balance equation of gas recovery and binomial gas recovery equation for gas well,calculate the production curve of gas well and match it with the actual production curve,finally determine the reserve and productivity parameter,this method doesn't need much pressure build-up data,and can calculate the c...

该方法的推导思路是：假设在某一控制储量条件下，联立求解气藏物质平衡方程式和气井二项式采气方程，计算气井采气曲线并将其与实际的采气曲线相匹配，最后确定储量、产能参数。该方法不需要较长的多次关井复压资料，在气藏受水驱影响较小时，还可计算一口探井或气藏试采早期所反映出的气井控制储量，在气藏生产中得到应用，计算结果较为可靠

And by the 14th century Chinese mathematicians had made significant advances in algebra, in the numerical solution of equations and in the rudiments of the binomial theorem.

到14世纪，中国数学家们在代数、数的方程解答和基础二项式定理方面都取得了重大发展。

Considering that rock's permeability is exponential function along with formation pressure and starting from nonDarcy percolation theory of gas at high speed, this paper derives a new pseudo pressure binominal exponential deliverability equation and its solution method.

在考虑岩石渗透率随地层压力呈指数函数变化的基础上，从气体的高速非达西渗流理论出发，推导出新的拟压力二项式产能方程及其求解方法。

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。