Adsorption Isotherms and Permeability of Tight Shales Using Magnetic Suspension Balance Experiments

2018 ◽  
Author(s):  
Ram R. Ratnakar ◽  
Birol Dindoruk
Keyword(s):  
Adsorption Isotherms ◽  
Magnetic Suspension ◽  
Magnetic Suspension Balance

A New Technique for Simultaneous Measurement of Nanodarcy-Range Permeability and Adsorption Isotherms of Tight Rocks Using Magnetic Suspension Balance

SPE Journal ◽  
2019 ◽  
Vol 24 (06) ◽  
pp. 2482-2503 ◽  
Author(s):  
Ram R. Ratnakar ◽  
Birol Dindoruk
Keyword(s):  
Experimental Data ◽  
Performance Management ◽  
Adsorption Isotherms ◽  
Gas Adsorption ◽  
Transient Behavior ◽  
Volume Averaging ◽  
Magnetic Suspension ◽  
Klinkenberg Effect ◽  
Apparent Permeability ◽  
Magnetic Suspension Balance

Summary Flow and adsorptive characteristics of methane and other natural gases onto tight rock formations are of economic interest for proper engineering evaluation and reservoir performance management. This work presents a novel technique to enable the simultaneous determination of nanodarcy permeability and adsorption isotherms of gas in such formations through the transient analysis of experimental data from magnetic suspension balance (MSB). MSB has primarily been shown to be an effective tool for evaluating the amount of gases adsorbed onto tight shales/coals, especially when the adsorbed amount is small. In addition to the classical usage of the measured data using MSB, a new mathematical model based on volume averaging has been developed to describe the transient behavior of the adsorption phenomenon and to obtain the nominal or apparent permeability of shale samples from experimental data. Historically, the permeability of nanoporous materials is measured using two leading methods: the Gas Research Institute method and the pressure–pulse–decay method; however, neither of these methods yields information about the adsorptive behavior of the porous medium or considers such phenomena. In this study, we developed a simple theoretical framework to obtain the isotherm of gas adsorption onto a tight shale (or other tight materials such as coal) sample and the permeability of the sample, simultaneously. The results show that the permeability vs. pressure plot follows the Klinkenberg effect at lower pressures, as expected. The overall methodology developed here can be applied to any type of adsorbing gases and shale/coal samples. The utility and validity of the methodology are demonstrated by applying the developed methodology in experiments performed on three tight shale samples (unconventionals) using two different gases: methane and CO2.

The diffusivity modeling of different gases in acrylonitrile butadiene styrene (ABS)

2020 ◽  
pp. 089270572097619
Author(s):  
Hamidreza Azimi
Keyword(s):  
Chemical Potential ◽  
Acrylonitrile Butadiene Styrene ◽  
Magnetic Suspension ◽  
Magnetic Suspension Balance ◽  
Proposed Model ◽  
Normal Hexane ◽  
Temperature And Pressure ◽  
Predicted Values ◽  
Different Gases ◽  
Butadiene Styrene

In this work, we used three gases (CO2, N2 and normal hexane) for diffusivity measurements in Acrylonitrile butadiene styrene (ABS). We proposed a diffusion model that the diffusion coefficients of each gas in ABS could be estimated from the specific volume of ABS/gas mixture and chemical potential of gas in ABS. The solubility and diffusivity of three gases into ABS were determined by a magnetic suspension balance. The results showed that the solubility and diffusivity of three gases increased with increasing of pressure. Also it was determined that N2 has a lowest solubility and the highest diffusivity in ABS in all temperature and pressure ranges. It was shown that there was a suitable overlapping between the experimental and predicted values from the proposed model, in which the proposed model could successfully estimate the diffusion coefficient of mentioned gases in ABS in all temperature and pressure ranges.

scholarly journals Volumetric–Densimetric Measurements of the Adsorption Equilibria of Binary Gas Mixtures

2005 ◽  
Vol 23 (9) ◽  
pp. 685-702 ◽  
Author(s):  
J.U. Keller ◽  
N. Iossifova ◽  
W. Zimmermann
Keyword(s):  
Activated Carbons ◽  
Co Adsorption ◽  
Measurement Procedure ◽  
Gas Mixtures ◽  
Magnetic Suspension ◽  
Porous Solids ◽  
Magnetic Suspension Balance ◽  
Adsorption Equilibria ◽  
On Line ◽  
Gas Expansion

A new method for measuring the binary co-adsorption equilibria of gas mixtures with non-isomeric components on porous solids such as activated carbons or zeolites is proposed. The method does not require an analysis of the sorptive gas phase in adsorption equilibrium and can be automated fairly simply. It consists of a simple volumetric/manometric gas expansion arrangement combined with the measurement of the density of the sorptive gas mixture in equilibrium via the buoyancy of a sinker fixed to a microbalance. These gas density measurements can be performed on-line preferably with a magnetic suspension balance (MSB) (Rubotherm GmbH, Bochum, Germany, 2-site-type). The experimental lay-out of the instrument used is given and the measurement procedure is outlined. The theory of the measurement is presented and expressions for experimental uncertainties of component masses adsorbed are provided. As examples, the co-adsorption equilibria data of gas mixtures (CO2/CH4) and (H2/CH4) on activated carbon (D47/3, CarboTech, Essen, Germany) at 293 K and 333 K for pressures up to 2 MPa are presented and discussed to a certain extent.

Method for estimating vapour pressures based on thermogravimetric measurements with a magnetic suspension balance

2018 ◽  
Vol 664 ◽  
pp. 128-135 ◽  
Author(s):  
Ricarda Kendler ◽  
Frieder Dreisbach ◽  
Reza Seif ◽  
Stefan Pollak ◽  
Marcus Petermann
Keyword(s):  
Magnetic Suspension ◽  
Magnetic Suspension Balance
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