Nuclear Energy and Waste Disposal

Scheer, Dirk; Class, Holger; Flemisch, Bernd

doi:10.1007/978-3-030-51178-4_8

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…Characterization of fluid flow through tight formations is imperative for studies related to carbon capture utilization and storage, hydrogen storage, radioactive waste disposal, geothermal energy recovery, and oil and gas production from unconventional reservoirs . Unconventional resources have become an important source of energy because of recent developments in horizontal drilling and multistage hydraulic fracturing.…”

Section: Introductionmentioning

confidence: 99%

A Model and Measurement Technique for Liquid Permeability of Tight Porous Media Based on the Steady-State Method

Yousefi

Dehghanpour

2022

Energy Fuels

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Measuring tight-rock properties, in particular, permeability, is very important in a wide range of engineering applications from radioactive waste disposal and CO2 storage to production from unconventional hydrocarbon reservoirs. The steady-state method of permeability measurement is currently known to be impractical for tight rocks due to the long time needed to reach stabilized pressure and flowrate. In contrast to experimental results, the diffusivity equation predicts the steady state to happen much faster when a constant injection flowrate is used as a boundary condition. In this paper, we investigate the reason behind the inconsistency between the modeled and measured equilibrium time. We modify the boundary condition of the diffusivity equation based on an analogy from the well-testing models. We propose a semi-analytical solution for a more general diffusivity equation with a modified boundary condition. The results show that the main reason that makes the steady-state method time-consuming is the accumulator “storage effect”. When dealing with low-permeability rocks, the compressibility-induced flowrate, which is pressure-dependent, could be in the order of pump flowrate and makes the permeability measurement time-consuming. We modify the conventional coreflooding device to reduce the time of permeability measurement, making the steady-state method practical for tight-rock samples. The modified device is used to measure the permeability of a tight-rock sample, and the model can match the measured data with a very good accuracy. Reducing the volume of the accumulator vessel from 500 cc to around 10 cc causes a 50-fold decrease in the time required for steady-state establishment.

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Section: Introductionmentioning

confidence: 99%

A Model and Measurement Technique for Liquid Permeability of Tight Porous Media Based on the Steady-State Method

Yousefi

Dehghanpour

2022

Energy Fuels

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Modeling Two-Phase Flow in Tight Core Plugs with an Application for Relative Permeability Measurement

Yousefi

Dehghanpour

2023

SPE Reservoir Evaluation &Amp; Engineering

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Summary The two-phase flow of immiscible fluids in porous media has been studied for a long time in different disciplines of engineering. Relative permeability (kr) is one of the constitutional relationships in the general equation governing immiscible displacement that needs to be determined. Due to the complexity and nonlinear nature of governing equations of the problem, there is no unique model for relative permeability. The modified Brooks and Corey (MBC) model is the most common model for kr prediction. Here, a practical technique is presented to measure kr for low-permeability tight rocks. We use this experimental data to tune the empirical constants of the MBC model. The proposed method is based on a simple mathematical technique that uses assumptions of frontal advance theory to model the pressure drop along the core plug during two-phase immiscible displacement at constant injection flow rate. We make simplifying assumptions about the highest point on the observed pressure profile and use those assumptions to determine relative permeability of a tight rock sample. In the end, the amount of work for an immiscible displacement is calculated as the area under the pressure-profile curve. The effect of initial water saturation (Swi) and interfacial tension (IFT) is studied on the work required for an immiscible displacement. Using this concept, it is concluded that adding chemical additives such as surfactants to fracturing fluids can help the reservoir oil to remove the water blockage out of the rock matrix more easily while maintaining the flow rate at an economic level.

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Nuclear Energy and Waste Disposal

Cited by 2 publications

References 12 publications

A Model and Measurement Technique for Liquid Permeability of Tight Porous Media Based on the Steady-State Method

A Model and Measurement Technique for Liquid Permeability of Tight Porous Media Based on the Steady-State Method

Modeling Two-Phase Flow in Tight Core Plugs with an Application for Relative Permeability Measurement

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