threshold pressure

An equation is also got to calculate the threshold pressure gradient in nonlinear seepage flow by analyzing to the data got form the single-phase seepage flow experiments.

通过对岩心单相渗流实验得到的数据进行分析归纳，得到了其流体非线性渗流段启动压力梯度的计算式。

Transient Pressure of Percolation Through One Dimension Porous Media with Threshold Pressure Gradient

低渗透介质含启动压力梯度一维瞬时压力分析

The analysis shows that the longer the producing time, the greater the threshold pressure gradient is, and the faster the production decline is.

分析结果表明，随着生产时间增长，启动压力梯度对产量影响显著，启动压力梯度越大，井的产量下降得就越快。

The relationship between permeability and the threshold pressure gradient is studied by the threshold pressure gradient experiment.

利用启动压力梯度实验，研究油层渗透率与启动压力梯度的关系；

Determination of threshold pressure with IPR method

利用IPR方法确定启动压力

When the temperature increases from 700 ℃ to 800 ℃, the threshold pressure P_0 for infiltration markedly decreases.

另外预制型预热温度也对临界压力有较大影响，在温度从700℃增加到800℃过程中临界压力随着温度上升而明显下降。

The threshold pressure gradient of low permeability sandstone was studied experimentally by measuring the pressure attenuation in an unsteady seepage flow.

为了研究低渗透砂岩的启动压力梯度，设计了一种非稳态渗流中测量压力的试验方法。

And this paper build the relationship formula between threshold pressure gradient and air permeability, water saturation.

并且建立了油水两相启动压力梯度与空气渗透率、含水饱和度的关系式。

The same rock core has a lower threshold pressure gradient when larger steady threshold seepage velocities occur.

同一块岩心在初始稳定渗流速度大的情况下，岩心的启动压力梯度小。

The control group used the ordinary threshold pressure load inspiratory muscle training device, without speed control and the pressure being 25% of MIP.

20例同病对照组使用普通阈压力负荷吸气肌锻炼仪，不限速，同压力。

Unsteady seepage model for low permeability reservoir with threshold pressure gradient

考虑启动压力梯度的低渗透油藏不稳定渗流模型

Based on the flow equation concerned on threshold pressure gradient and deforming media, this paper productivity equation and IPR forecasting method for low permeability reservoir.

基于考虑启动压力梯度和介质变形特性的单相流渗流方程，建立了适应于低渗透油藏油井的产能方程，并给出了低渗透油藏单相流IPR预测方法。

The method is presented to determine formation average pressure and boundary pressure with threshold pressure gradient and injection-production ratio.

给出了考虑注采比和启动压力梯度的平均地层压力和边界压力的确定方法。

Based on the research of gas well productivity and threshold pressure gradient at home and abroad, forecasting model of gas well productivity is optimized using field document.

在充分调研国内外气井产能和气藏启动压力梯度的研究现状的基础上，利用现场资料，对气井产能预测模型进行优选。

The non-linear stable flow considering threshold pressure gradient is studied.

研究了考虑启动压力梯度的非线性稳定渗流问题。

The experiments show that microbe solution flooding can decrease the threshold pressure gradient, lessen the flow resistance, and extend the effective drainage distance.

与水驱相比，微生物驱油可降低启动压力梯度，降低渗流阻力，扩大有效驱动距离。

The Experiment Study of the Influencing Factors on the Threshold Pressure and the Driving Oil Efficiency of the Low Permeability Sandstone Reservoir

低渗透砂岩储层启动压力及水驱油效率影响因素实验研究

Using speed-governed threshold pressure load inspiratory muscle training device in lung rehabilitation among COPD patients

慢性阻塞性肺疾病患者使用限速阈压力负荷吸气肌锻炼仪进行肺康复锻炼

While, long conductivity and threshold pressure are two keys to extra-low permeability oil reservoirs, and the two keys can influence the production and financial benefit.

同时文中还提出了，对于特低渗透油藏，必须使用长期导流能力，并且考虑启动压力带来的影响，以及这些因素对经济界限的影响。

Based on the experiment results, paper plots the relationship cure between threshold pressure gradient and permeability, and gets the critical Reynolds' number of a certain region;

根据实验结果，建立了启动压力梯度与渗透率的相关曲线，得出了某一地区的临界雷诺数；

The mathematical model with threshold pressure gradient and injection-production ratio is constructed when the formation pressure change linearly on the base of material balance principle.

利用物质守恒原理，建立地层压力线性变化趋势下考虑启动压力梯度和注水强度影响的渗流数学模型。

Influencing Factors for Threshold Pressure Gradient near the Wellbore on Tight Sand Stones Reservoirs

致密砂岩储层近井区启动压力梯度的存在原因探讨

Testing results indicate that the threshold pressure of jet aided drilling is 4.1 times of rock tensile strength and 26% of rock compressive resistance, also related with the bottom hole pressure difference and rock physical properties.

实验结果表明，射流辅助钻井的门限压力是岩石抗拉强度的4.1倍，是抗压强度的26%；还与井底压差及其它岩石物理力学性质有关。

Many experiments justify that there is a threshold pressure gradient ( TPG ) in low permeability reservoirs.

试验表明,低渗透油藏存在启动压力 梯度.

The study results also show that low-permeability reservoir gas injection has a threshold pressure, and the value of this experiment is 2.48 MPa.

低渗透油藏注气存在注气启动压力，本次实验为2.48MPa。

One-dimension water-oil displacement mathematics model considering threshold pressure gradient is established.

建立了考虑启动压力梯度的一维油水两相驱替数学模型，进行了数值求解。

Many experiments justify that there is a threshold pressure gradient ( TPG) in low permeability reservoirs.

试验表明，低渗透油藏存在启动压力梯度。

Non-linear seepage flow is caused chiefly by medium deformation and threshold pressure gradient ( TPG) in low and ultra-low permeability reservoirs.

启动压力梯度和介质变形是油气在低渗透、特低渗透储集层中渗流规律偏离达西定律的主要原因。

Threshold pressure gradient selection in polymer flooding process

聚合物驱油过程中的阈压梯度选择

THE PRODUCTIVITY CALCULATION FOR WELL PATTERN OF LOW PERMEABILITY RESERVOIR CONSIDERING THRESHOLD PRESSURE GRADIENT Influence of capillary pressure on fluid flow and production performance in low-permeability oilfields

低渗透油田考虑启动压力梯度计算井网产量毛管压力对低渗透油藏渗流规律和开发动态的影响