A review on the effect of confinement on phase behavior in tight formations

Salahshoor, Shadi; Fahes, Mashhad; Teodoriu, Cătălin

doi:10.1016/j.jngse.2017.12.011

Cited by 65 publications

(61 citation statements)

References 42 publications

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“…However, fluid properties in nano‐porous media, such as PVT properties, are not only governed by fluid molecular interaction but also influenced by the interaction between fluid molecules and the pore wall. Many experiments have proved that fluid molecular‐wall interaction plays an important role in the mass transfer in tight reservoirs and shale gas reservoirs . The effect of pore size on PVT properties is focused on finding a more applicable EOS or modifying the EOS for nano porous media.…”

Section: Flash Calculation Of Confined Fluidsmentioning

confidence: 99%

“…Many experiments have proved that fluid molecular-wall interaction plays an important role in the mass transfer in tight reservoirs and shale gas reservoirs. 1,21,23 The effect of pore size on PVT properties is focused on finding a more applicable EOS or modifying the EOS for nano porous media. Ma et al introduced one parameter into the EOS, and the modified EOS could describe the fluid molecular-wall interactions and fluid inter-molecular interactions.…”

Section: Modified Srk Eosmentioning

confidence: 99%

“…Tight oil has become a vital energy source all over the world, and its unique characteristic of being rich in nanoscale pores has made its development challenging . In tight oil reservoirs, fluid phase behaviors are significantly different from those in conventional reservoirs due to the confinement effect, which significantly affects the fluid properties, mass transfer process, and fluid flows .…”

Section: Introductionmentioning

confidence: 99%

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Impact of fluid property shift and capillarity on the recovery mechanisms of CO₂injection in tight oil reservoirs

Sarma

et al. 2019

Greenhouse Gases

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The phase equilibria with the confinement effect could shift in nano‐pores, which could have a great impact on the recovery mechanisms of CO2 injection in tight oil reservoirs; this has not been systematically studied. In this paper, the confinement effect with property shift and capillarity effect is introduced into the flash calculation of confined fluids. The Soave modification of the Redlich–Kwong equation of state is extended by the molecular‐wall collision parameter to describe the shifted pressure–volume–temperature properties of confined fluid, and the Young–Laplace equation is applied to evaluate the capillary pressure. This developed model could effectively be applied for phase equilibrium calculation in tight porous media because of the verification of experimental results. A binary mixture is investigated to study the different effect of capillary pressure and property shift on phase equilibria. Subsequently, a typical hydrocarbon fluid from Middle Bakken tight oil reservoirs is studied with CO2 injection. Results illustrate that the confinement effect could play an increasingly important part in the phase equilibrium state. The CO2 solubility and mass transfer driving force in tiny pores would be greater than those in large pores under the same conditions. The gas phase saturation would be smaller with the same compositions, which could extend the single‐phase region of fluid flow in porous media. Furthermore, bubble‐point pressure, the minimum miscible pressure of CO2/hydrocarbon, and the viscosity of tight oil dissolved with CO2 both decrease with the pore size, which has a good influence on tight oil recovery. In general, the confinement effect could effectively reinforce the recovery mechanisms of CO2 injection, which is conducive to the enhancement of tight oil recovery. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Flash Calculation Of Confined Fluidsmentioning

confidence: 99%

Section: Modified Srk Eosmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of fluid property shift and capillarity on the recovery mechanisms of CO₂injection in tight oil reservoirs

Sarma

et al. 2019

Greenhouse Gases

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“…In the literature several mathematical models are proposed to estimate Z , including the Van der Waals equation (Van Der Waals & Rowlinson, ), the Redlich‐Kwong equation (Redlich & Kwong, ), the Soave‐Redlich‐Kwong equation (Soave, ), and the Peng‐Robinson equation (Peng & Robinson, ). Most recently, improved Van der Waals equation (Travalloni et al, ), Peng‐Robinson equation (Luo et al, ), and Redlich‐Kwong equation (Wu, Chen, et al, ) are also introduced to model fluid phase behavior at the nanoscale considering confinement and adsorption phenomenon, especially when the characteristic length scale is smaller than 10 nm (Salahshoor et al, ; Jin & Firoozabadi, ). In this study, the Peng‐Robinson equation is used for predicting the properties of hydrocarbons, in which EOS is given as

p = \frac{R T}{V_{m} - b} - \frac{a α}{V_{m}^{2} + 2 b V_{m} - b^{2}},

a \approx \frac{0.45724 R^{2} T_{c}^{2}}{P_{c}},

b \approx \frac{0.0778 R T_{c}}{P_{c}},

α = {false(1 + κ false(1 - T_{r}^{0.5} false) false)}^{2},

where T c and P c are the critical temperature and the critical pressure of the gas, respectively.…”

Section: Local Flow Modelmentioning

confidence: 99%

Analytical Solution of Gas Flow in Rough‐Walled Microfracture at In Situ Conditions

Wang

Tang

Jing

2019

Water Resources Research

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The development of the unconventional gas and CO2 sequestration is moving to deep formations. Because of the small flow pathways in the matrix, the Knudsen number might be high even though the gas is dense. In fact, due to the relatively high pressure at in situ conditions, gas flow in microfractures usually manifests a strong slip and nonideal gas effects. Therefore, understanding the coupling mechanism of these two on gas flow in rough‐walled microfractures is required to accurately model subsurface flow behavior. In this study, pressure‐driven gas flow in rough‐walled microfracture is analyzed in depth. Starting from the local governing equations for gas flow, a local flow model that includes gas slip and nonideal gas effects is derived by solving the Stokes equation with a first‐order slip boundary condition. Focusing at the representative elementary volume scale, the upscaled solutions to gas flow in a fracture with sinusoidal surface are derived to obtain the apparent permeability. The impact of nonideal gas effects, fracture roughness and aperture, and the tangential momentum accommodation coefficient on CH4 and CO2 flow is analyzed. The results show that fracture roughness introduces a high degree of heterogeneity in gas flow. At in situ conditions effects of gas slip, fracture roughness and tangential momentum accommodation coefficient on gas flow are reduced. The ideal gas law is capable of estimating CH4 flow to some extent. However, it fails to estimate CO2 flow in microfractures.

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“…Water tanks are used for drinking, firefighting, agriculture, and different industrial plants [1][2][3][4]. To keep the required water pressure in the water network, engineers use EWTs, which increase the head of water in the network.…”

Section: Introductionmentioning

confidence: 99%

Predicting Dynamic Capacity Curve of Elevated Water Tanks: A Pushover Procedure

Mellati

2018

Civ Eng J

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Despite the importance of water tanks for water supplies and supporting the community resilience through the firefighting usages in catastrophic conditions, post-earthquake situations especially, a few studies have been done on seismic behavior of water tanks so far. The scope of this paper is to propose a new pushover procedure to evaluate seismic responses of elevated water tanks (EWT) supported on the concrete shaft in the form of dynamic capacity curves (i.e. base shear versus top displacement). In this regard, a series of shaft supported EWTs are simulated considering soil-structure and fluid-structure interactions. The shaft is modelled with frame elements and plastic hinges are assigned along the shaft to consider the material nonlinearity. The effect of soil-structure interaction and fluid-structure interaction are considered through the well-known Cone model and modified Housner model, respectively. At first, parametric studies have been conducted to investigate the effects of various essential parameters such as soil type, water level and tank capacity on seismic responses of EWTs using incremental dynamic analysis (i.e. nonlinear-time-history-analyses with varying intensities). Thereafter, pushover analyses as nonlinear static analyses are performed by variation of lateral load patterns. Finally, utilizing these results and comparing them with mean IDA curve, as an exact solution; a pushover procedure based on the most reliable lateral load patterns is proposed to predict the mean IDA curve of the EWTs supported on the concrete shaft. The obtained results demonstrate the accuracy of the proposed pushover procedure with errors limited to 30 % only in the changing stage from linear to nonlinear sections of the IDA curve.

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A review on the effect of confinement on phase behavior in tight formations

Cited by 65 publications

References 42 publications

Impact of fluid property shift and capillarity on the recovery mechanisms of CO₂injection in tight oil reservoirs

Impact of fluid property shift and capillarity on the recovery mechanisms of CO₂injection in tight oil reservoirs

Analytical Solution of Gas Flow in Rough‐Walled Microfracture at In Situ Conditions

Predicting Dynamic Capacity Curve of Elevated Water Tanks: A Pushover Procedure

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A review on the effect of confinement on phase behavior in tight formations

Cited by 65 publications

References 42 publications

Impact of fluid property shift and capillarity on the recovery mechanisms of CO2injection in tight oil reservoirs

Impact of fluid property shift and capillarity on the recovery mechanisms of CO2injection in tight oil reservoirs

Analytical Solution of Gas Flow in Rough‐Walled Microfracture at In Situ Conditions

Predicting Dynamic Capacity Curve of Elevated Water Tanks: A Pushover Procedure

Contact Info

Product

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Impact of fluid property shift and capillarity on the recovery mechanisms of CO₂injection in tight oil reservoirs

Impact of fluid property shift and capillarity on the recovery mechanisms of CO₂injection in tight oil reservoirs