Light Oil Recovery From Cyclic CO2 Injection: Influence of Low Pressures, Impure CO2, and Reservoir Gas

Monger, T.G.; Ramos, Joel; Thomas, Jacob

doi:10.2118/18084-pa

Cited by 56 publications

(43 citation statements)

References 6 publications

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“…As a starting point for our test design, we consider a test sequence frequently used for oil reservoir characterization by (1) injecting CO 2 , (2) shutting-in the well to allow the injected CO 2 to migrate and dissolve into the oil phase, and (3) producing the mobilized mixture back (Mohammed-Singh et al, 2006; Monger et al, 1991). This "Huff-n-Puff" methodology has been used as part of a CO 2 sequestration demonstration at the Loudin Oil Field (Berger et al, 2009;Frailey and Finley, 2008) as part of an enhanced oil recovery (EOR) operation.…”

Section: Design Approachmentioning

confidence: 99%

Single-well experimental design for studying residual trapping of supercritical carbon dioxide

Zhang

Freifeld

Finsterle

et al. 2011

International Journal of Greenhouse Gas Control

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The objective of our research is to design a single-well injection withdrawal test to evaluate residual phase trapping at potential CO 2 geological storage sites. Given the significant depths targeted for CO 2 storage and the resulting high costs associated with drilling to those depths, it is attractive to develop a single well test that can provide data to assess reservoir properties and reduce uncertainties in the appraisal phase of site investigation. The main challenges in a single-well test design include (1) difficulty in quantifying the amount of CO 2 that has dissolved into brine or migrated away from the borehole; (2) non-uniqueness and uncertainty in the estimate of the residual gas saturation (S gr ) due to correlations among various parameters; and (3)the potential biased S gr estimate due to unaccounted heterogeneity of the geological medium. To address each of these challenges, we propose (1) to use a physical-based model to simulation test sequence and inverse modeling to analyze data information content and to quantify uncertainty; (2) to jointly use multiple data types generated from different kinds of tests to constrain the S gr estimate; and (3) to reduce the sensitivity of the designed tests to geological heterogeneity by conducting the same test sequence in both a water-saturated system and a system with residual gas saturation. To perform the design calculation, we build a synthetic model and conduct a formal analysis for sensitivity and uncertain quantification. Both parametric uncertainty and geological uncertainty are considered in the analysis. Results show (1) uncertainty in the estimation of S gr can be reduced by jointly using multiple data types and repeated tests; and (2) geological uncertainty is essential and needs to be accounted for in the estimation of S gr and its uncertainty. The proposed methodology is applied to the design of a CO 2 injection test at CO2CRC's Otway Project Site, Victoria, Australia. Introduction and ObjectiveThe geologic sequestration of anthropogenic greenhouse gases to mitigate climate change is receiving increasing attention as a means to reduce atmospheric emissions and the related impacts as a result of continued use of fossil fuels. The ability of a host formation to effectively trap CO 2 determines the suitability of a proposed site for long-term CO 2 sequestration. Four trapping mechanisms have been identified (IPCC, 2005): structural trapping, residual phase trapping, solubility trapping and mineralization trapping. This study focuses on residual phase trapping, i.e., the immobilization of individual bubbles or relatively small blobs of the CO 2 -rich phase. TheCO 2 bubbles are either trapped by capillary forces or are stuck in local trapping structures or dead-end portions of the pore space, preventing further CO 2 migration in response to pressure gradients or buoyancy forces. (CO 2 saturation can be reduced below the residual value by processes other than viscous flow, e.g., by compression or dissolution.) A parameter referred to as re...

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Section: Design Approachmentioning

confidence: 99%

Single-well experimental design for studying residual trapping of supercritical carbon dioxide

Zhang

Freifeld

Finsterle

et al. 2011

International Journal of Greenhouse Gas Control

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“…The main goal of utilization processes such as EOR and EGR is production of more hydrocarbons from oil and gas reservoirs (Baines and Worden 2004;Moberg 2001;Monger et al 1991;Holm and Josendal 1974). Storage and sequestration of CO 2 are recently considered in these processes (Pamukcu and Gumrah 2008).…”

Section: Nomenclature Amentioning

confidence: 99%

CO2 Injection in Geological Formations: Determining Macroscale Coefficients from Pore Scale Processes

Javadpour

2008

Transp Porous Med

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Carbon dioxide (CO 2 ) injections in geological formations are usually performed for enhanced hydrocarbon recovery in oil and gas reservoirs and storage and sequestration in saline aquifers. Once CO 2 is injected into the formation, it propagates in the porous rock by dispersion and convection. Chemical reactions between brine ions and CO 2 molecules and consequent reactions with mineral grains are also important processes. The dynamics of CO 2 molecules in random porous media are modeled with a set of differential equations corresponding to pore scale and continuum macroscale. On the pore scale, convectivedispersive equation is solved considering reactions on the inner boundaries in a unit cell. A unit cell is the smallest portion of a porous media that can reproduce the porous media by repetition. Inner boundaries in a unit cell are the surfaces of the mineral grains. Dispersion process at the pore scale is transformed into continuum macroscale by adopting periodic boundary conditions for contiguous unit cells and applying Taylor-Aris dispersion theory known as macrotransport theory. Using this theory, the discrete porous system changes into a continuum system within which the propagation and interaction of CO 2 molecules with fluid and solid matrix of the porous media are characterized by three position-independent macroscopic coefficients: the mean velocity vectorŪ * , dispersivity dyadicD * , and mean volumetric CO 2 depletion coefficientK * . 123 88 F. Javadpour Nomenclature A A-function (cf. Eq. 19) B B-field (cf. Eq. 23) C Concentration, mol m −3 D Dispersivity dyadic, m 2 s −1 DMolecular diffusion coefficient, m 2 s −1 D g Diameter of a mineral grain, m D x Macrotransport dispersivity coefficient in x-direction, m 2 s −1 D * Macrotransport dispersivity dyadic coefficient, m 2 s −1 J ∞ 0 Asymptotic probability flux density, m −2 s −1 K Permeability tensor, m 2 K * Macroscale depletion rate, or mean volumetric CO 2 sequestration coefficient, s −1 K x Macrotransport depletion rate coefficient in x-direction, s −1 lBasic lattice vectors, m l Unit cell length, m L Length of porous bed, m p Pressure, kPa P ∞ 0 Steady state conditional probability density, fraction r Radial vector, m R Macroscale position vector, m R n Discrete position vector specifying the location of the nth unit cell, m s Ratio of reactive surface to the interstitial space volume, m −1 (m 2 m −3 ) s g

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“…Around 32 million tons of CO 2 per year are injected into oil reservoirs for EOR in the US (NETL web-site). The two main EOR processes are discussed by Holm & Josendal (1974), Monger et al (1991, and briefly by Worden & Smith. Historically, the long term storage of CO 2 was not considered by EOR operators; CO 2 which reached the surface during production was either vented or captured for recycling.…”

Section: Saline Aquifersmentioning

confidence: 99%

Effects of Heart Rate Changes on Arterial Distensibility in Humans

O’Rourke

Adji

2004

Hypertension

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Carbon dioxide is the main compound identified as affecting the stability of the Earth's climate. A significant reduction in the volume of greenhouse gas emissions to the atmosphere is a key mechanism for mitigating against climate change. Geological storage of CO 2, or the injection and stabilization of large volumes of CO 2 in the subsurface in saline aquifers, existing hydrocarbon reservoirs or unmineable coal-seams, is one of the more technologically advanced options available. A number of studies have been carried out aimed at understanding the behaviour and long term fate of CO 2 when stored in geological formations.

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Light Oil Recovery From Cyclic CO2 Injection: Influence of Low Pressures, Impure CO2, and Reservoir Gas

Cited by 56 publications

References 6 publications

Single-well experimental design for studying residual trapping of supercritical carbon dioxide

Single-well experimental design for studying residual trapping of supercritical carbon dioxide

CO2 Injection in Geological Formations: Determining Macroscale Coefficients from Pore Scale Processes

Effects of Heart Rate Changes on Arterial Distensibility in Humans

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