Competitive adsorption phenomenon in shale gas displacement processes

Shi, Jihong; Gong, Liang; Sun, Shuyu; Huang, Zhaoqin; Ding, Bin; Ye, Jun

doi:10.1039/c9ra04963k

Cited by 38 publications

(36 citation statements)

References 35 publications

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“…They considered the displacement of methane through the injection of carbon dioxide in the shale pores of different sizes. It was observed that carbon dioxide injection becomes more effective in large pore sizes . Additionally, Psarras et al used lower total organic carbon (TOC) and low clay content samples to study the nature (chemistry) of kerogen and how temperature and pressure impact the adsorption.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Recovery From Organic-Rich Shales through Carbon Dioxide Injection: Molecular-Level Investigation

et al. 2020

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Petroleum engineers are always in a race to maximize the recovery factor out of naturally trapped hydrocarbon resources. Unconventional resources such as organic-rich shales have unlocked significant reserves attributed to the novel production technologies of lateral drilling assisted by hydraulic fracturing. Even though such techniques have enabled the exploitation of shales, the ultimate recovery remained fractional, a challenge to be answered through further improvement. Carbon dioxide injection in unconventional resources, which was initially implemented for coalbed methane, has been recently an active area of investigation for organic-rich shales. In this paper, we present a molecular modeling study of carbon dioxide injection in the organic matter of the shale matrix. We built the molecular model, consistent with the repeated organic matter characterization in the literature. Molecular dynamics (MD) protocol was developed to form a three-dimensional (3-D) configuration of kerogen, followed by Gibbs Monte Carlo simulation for the adsorption/desorption calculations, and self-diffusivity calculations through MD. The aim was to delineate the impact of carbon dioxide injection on the adsorption/desorption behavior coupled with its influence on the transport. Injection of carbon dioxide was found to shift the adsorption isotherm favoring the depletion of methane. The ultimate recovery raised from 54% (no injection of CO 2 ) up to 92% depending on the carbon dioxide concentration and its temperature. Moreover, the injection of carbon dioxide was found to have a minimal impact on the self-diffusivity of methane in kerogen bodies and their associated microcracks.

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Section: Introductionmentioning

confidence: 99%

Enhanced Recovery From Organic-Rich Shales through Carbon Dioxide Injection: Molecular-Level Investigation

et al. 2020

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“…The comparison of CO 2 , N 2 , and CO 2 /N 2 mixtures was also conducted; a higher CH 4 recovery existed in CO 2 displacement than that in N 2 displacement [131]. The displacement efficient of CH 4 by CO 2 was also compared with N 2 in simulation, and it is verified that competitive adsorption leads to a larger recovery for CO 2 displacing shale gas [132].…”

Section: Displacement Experiments Of Co 2 -Chmentioning

confidence: 87%

Study on Competitive Adsorption and Displacing Properties of CO2 Enhanced Shale Gas Recovery: Advances and Challenges

Liu

Sun

et al. 2020

Geofluids

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CO2 enhanced shale gas recovery (CO2-ESGR) draws worldwide attentions in recent years with having significant environmental benefit of CO2 geological storage and economic benefit of shale gas production. This paper is aimed at reviewing the state of experiment and model studies on gas adsorption, competitive adsorption of CO2/CH4, and displacement of CO2-CH4 in shale in the process of CO2-ESGR and pointing out the related challenges and opportunities. Gas adsorption mechanism in shale, influencing factors (organic matter content, kerogen type, thermal maturity, inorganic compositions, moisture, and micro/nano-scale pore), and adsorption models are described in this work. The competitive adsorption mechanisms are qualitatively ascertained by analysis of unique molecular and supercritical properties of CO2 and the interaction of CO2 with shale matrix. Shale matrix shows a stronger affinity with CO2, and thus, adsorption capacity of CO2 is larger than that of CH4 even with the coexistence of CO2-CH4 mixture. Displacement experiments of CO2-CH4 in shale proved that shale gas recovery is enhanced by the competitive adsorption of CO2 to CH4. Although the competitive adsorption mechanism is preliminary revealed, some challenges still exist. Competitive adsorption behavior is not fully understood in the coexistence of CO2 and CH4 components, and more experiment and model studies on adsorption of CO2-CH4 mixtures need to be conducted under field conditions. Coupling of competitive adsorption with displacing flow is key factor for CO2-ESGR but not comprehensively studied. More displacement experiments of CO2-CH4 in shale are required for revealing the mechanism of flow and transport of gas in CO2-ESGR.

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“…Several methods have been applied to measure the adsorption value [51,52]. The main methods applied include volumetric, gravimetric, volumetric-gravimetric, oscillometry, and impedance spectroscopy.…”

Section: Adsorption Measurementmentioning

confidence: 99%

A review of carbon dioxide adsorption to unconventional shale rocks methodology, measurement, and calculation

Fakher

Imqam

2019

SN Appl. Sci.

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Carbon dioxide (CO 2 ) injection has been applied extensively in hydrocarbon reservoirs for both increasing oil recovery and CO 2 storage purposes. Recently, CO 2 injection has been proposed to increase oil recovery and for CO 2 storage in shale reservoirs. During CO 2 injection in shale reservoirs, adsorption will take place on the surface of the rock, which will impact both the oil recovery and the storage capacity. This research provides a roadmap to the different types of adsorption and the adsorption measurements and calculations with emphasis on the ones most applicable during CO 2 injection in shale reservoirs. The main two types of adsorption are initially explained including physisorption and chemisorption, and the major applicable adsorption isotherms are explained and their limitations are listed. The research then focusses on physisorption and its types, and hysteresis trends since chemisorption does not occur in shale reservoirs during CO 2 injection. The different methods used to measure adsorption are then illustrated and explained including volumetric, gravimetric, volumetric-gravimetric, oscillometry, and impedance spectroscopy. The different calculation methods for volumetric adsorption are then explained. Finally, the most common errors that have been observed during measurement and calculation of adsorption are listed and explained, while mentioning the method to avoid each error. This research provides a guideline to the proper and accurate measurement of CO 2 adsorption on shale rock during enhanced oil recovery applications and CO 2 storage operations in unconventional shale reservoirs to improve the productivity and applicability of this application.

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Competitive adsorption phenomenon in shale gas displacement processes

Abstract: Displacement of methane (CH4) by injection gas is regarded as an effective way to exploit shale gas and sequestrate carbon dioxide (CO2) simultaneously.

Cited by 38 publications

References 35 publications

Enhanced Recovery From Organic-Rich Shales through Carbon Dioxide Injection: Molecular-Level Investigation

Enhanced Recovery From Organic-Rich Shales through Carbon Dioxide Injection: Molecular-Level Investigation

Study on Competitive Adsorption and Displacing Properties of CO2 Enhanced Shale Gas Recovery: Advances and Challenges

A review of carbon dioxide adsorption to unconventional shale rocks methodology, measurement, and calculation

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