Experiment and Mechanism Analysis on Threshold Pressure Gradient with Different Fluids

Zeng, Baoquan; Cheng, Linsong; Fei, Hao

doi:10.2118/140678-ms

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…During this process, every capillary pore has viscous force and capillary force, we usually use "capillary displacement ratio" to describe their relative size, and it is the ratio of viscous force and capillary force of displacing medium [2]. The more capillary displacement ratio is, the less residual oil is and the higher displacement efficiency is [3], so decreasing interfacial tension is a way of increasing capillary displacement ratio.…”

Section: Surfactant System Flooding Increasing Injection Mechanism An...mentioning

confidence: 99%

The Design of Surfactant Multiplex System for Lowering Threshold Pressure

Yin

Zhou

Zhang

2012

AMM

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In order to increase surfactant compound system injection in low permeability reservoir of Chaoyanggou oilfield, we do research into formula of surfactant compound system according to reservoir condition. By contrasting to interfacial tension of different kinds of surfactants, we choose petroleum sulfonate surfactant T720-40# as main agent. As equilibrium interfacial tension of this surfactant cannot meet the requirements, so we add Na2CO3 as auxiliary agent to decrease interfacial tension. The results of laboratory experiment research show that equilibrium interfacial tension of this multiplex surfactant system can reach 2×10-2mN/m. It has good thermal endurance, salt resistance, and also has good compatibility with Chaoyanggou injection water and formation water. It can make rock wettability reverse, reduce threshold pressure and displacement pressure and it can improve recovery by 5% contrasting to water flooding.

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Section: Surfactant System Flooding Increasing Injection Mechanism An...mentioning

confidence: 99%

The Design of Surfactant Multiplex System for Lowering Threshold Pressure

Yin

Zhou

Zhang

2012

AMM

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“…Low and ultralow permeability reservoirs, such as tight gas reservoirs, have recently garnered extensive attention as a result of their potential to meet the growing energy demand in the near future . Tight gas reservoirs typically have intricate and tiny pore throats, and the flow mechanisms are different from those of medium–high-permeability formations. − One of the unique flow characteristics observed in many tight formation experiments is low-velocity non-Darcy flow caused by the threshold pressure gradient (TPG). − The TPG is the minimum pressure gradient required to initiate non-Darcy flow in a porous medium, and the TPG value is defined as the intersection point between the non-Darcy flow curve and the x axis, as shown in Figure . It is one of the key components in comprehending the nonlinear flow in unconventional reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Productivity Analysis of Fractured Horizontal Wells in Tight Gas Reservoirs Using a Gas–Water Two-Phase Flow Model with Consideration of a Threshold Pressure Gradient

Ding

Fan

et al. 2023

Energy Fuels

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Tight gas reservoirs are valuable yet challenging unconventional resources as a result of their complex flow mechanisms. Typical challenges are characterized by gas−water two-phase flows with a threshold pressure gradient (TPG). In this work, experimental studies are initially conducted to investigate and quantify the influence of water saturation on the TPG. A gas− water two-phase flow model is then established for a fractured horizontal well considering the influence of water saturation on gas− water permeability and TPG, along with the dynamic changes in the water−gas ratio. Sensitive studies are performed to investigate the impact of various parameters on the productivity of a horizontal well. The results demonstrate that, as water saturation increases, the TPG increases and the relative permeability of the gas phase decreases, resulting in the gas well productivity decrease. As the permeability decreases, the changes in the TPG become more prominent, leading to a greater impact on productivity. In comparison to a constant TPG, the changes with water saturation in the TPG have a more significant effect on productivity. Hence, it is beneficial to regulate the rate of the water cut increase to enhance production in tight gas reservoirs.

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“…Many factors affect oil production , and it's hard to predict and evaluate the tight oil production. In this paper, considering the characteristics of tight oil reservoirs (fracturing parameters [1,2,9,10,11,13], threshold pressure gradient [3,12] and stress sensitive effect [6,8,13],) a larger number of orthogonal experiment is carried on by simulating with CMG IMEX [5]. SPSS software [7] has also been used to study the sensitivity of well production and effective flow area of tight oil horizontal well.…”

Section: Introductionmentioning

confidence: 99%

Dynamic and quantitative Sensitivity analysis on the efficient development of tight oil

Bai

Liu

Wang

et al. 2018

International Journal of Computational and Experimental Science and Engineering

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The aim of this paper is to present dynamic and quantitative sensitivity analysis for the tight oil development with horizontal fracturing well. In order to better show the influence of different parameters on the production index in the development of tight oil, a set of correlations predict the oil production and effective swept scope are built correspondingly. In this paper, 11 parameters are filtered after extensive investigation of typical characteristics of tight oil in China and America. The parameters include reservoir characteristics, threshold pressure gradient and stress sensitive effect, fracturing parameters etc. And then a group of orthogonal schemes were designed and simulated with the CMG IMEX Simulator. And then each five years' simulation results, including cumulative production, oil recovery and effective flow area are analyzed. The analysis result shows that the initial reservoir pressure and well bottom hole pressure, which decides whether the energy is sufficient to drive oil flow, is the most significant factor to influence the tight oil cumulative production. Secondly, reservoir thickness and porosity influence whether the reservoir oil is rich. However, for the oil recovery, the contribution of fracturing is more essential, which directly determines whether it has industrial oil production. In addition, threshold pressure gradient and stress sensitivity, the distinct seepage characteristics between tight oil and traditional reservoirs, will further exacerbate the ultra-low permeability and seepage process. The most immediate effect of the non-Darcy rffect is that the swept scope range becomes smaller. In addition, a series mathematical model are also established for the development effect estimation through the use of multivariate regression, Through data validation, the quantitative model error ranges 5.45% from 9.29%.

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Experiment and Mechanism Analysis on Threshold Pressure Gradient with Different Fluids

Cited by 5 publications

References 2 publications

The Design of Surfactant Multiplex System for Lowering Threshold Pressure

The Design of Surfactant Multiplex System for Lowering Threshold Pressure

Productivity Analysis of Fractured Horizontal Wells in Tight Gas Reservoirs Using a Gas–Water Two-Phase Flow Model with Consideration of a Threshold Pressure Gradient

Dynamic and quantitative Sensitivity analysis on the efficient development of tight oil

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