Subsurface porous formations provide large capacities for underground hydrogen storage (UHS). Successful utilization of these reservoirs UHS depends on accurate quantification the transport characteristics at continuum (macro) scale, specially in contact with other reservoir fluids. Relative-permeability and capillary-pressure curves are among macro-scale which play crucial roles capacity efficiency. For a given rock sample, functions can be determined if pore-scale (micro-scale) surface...

This work uses pilot examples of CO2 enhanced oil recovery to analyze whether and under which circumstances it is exergetically favorable sequester through recovery. We find that the net storage efficiency (ratio between stored captured CO2) carbon capture (CCS)-only projects maximally 6–56% depending on fuel used in power plants. With current state technology, CCS process will re-emit a minimum 0.43–0.94 kg per stored. From thermodynamics point view, (EOR) with option not sustainable, i.e.,...

Characterizing the wettability of hydrogen (H2)–methane (CH4) mixtures in subsurface reservoirs is first step towards understanding containment and transport properties for underground storage (UHS). In this study, we investigate static contact angles H2–CH4 mixtures, with brine Bentheimer sandstone rock using a captive-bubble cell device at different pressures, temperatures salinity values. It found that, under studied conditions, H2 CH4 show comparable behaviour ranging between [25°–45°];...

We report the study of flow CO2 and N2 foam in natural sandstone cores containing oil with aid X-ray computed tomography. The is relevant for enhanced recovery (EOR). were partially saturated brine (half top) only bottom) to mimic water−oil transition occurring reservoirs. was used either under subcritical conditions (P = 1 bar) or supercritical (immiscible 90 miscible 137 bar)) conditions, whereas remained subcritical. Prior gas injection flooded several pore volumes water. In a typical...

We report an experimental study of the behavior CO2 and N2 foams in granular porous media using X-ray computed tomography. In experiments either or gas is forced through natural initially saturated with a surfactant solution, process known as surfactant-alternating-gas SAG. The was under sub- supercritical conditions, whereas remained subcritical conditions at all conditions. found that injection following slug can considerably reduce its mobility promote higher liquid recovery investigated....

Abstract This paper reports a laboratory study of foam for improving immiscible gas flooding. The is relevant both continuous and Water Alternating Gas (WAG) injection schemes. effect oil on the longevity nitrogen air foams was studied in bulk selected set surfactants. Foam heights were measured glass column as function time, absence presence mineral crude oils. From experiments it found that increases carbon chain length molecule increases, i.e. more stable higher viscosity A surfactant...

Accurate modeling of foam rheology on the field scale requires detailed understanding correlation between fundamental properties and scalable parameters porous medium. It has been experimentally observed that experiences an abrupt coalescence when capillary pressure in medium approaches a certain value referred to as "limiting pressure", Pc*. Current models treat texture implicitly mimic this behavior with so-called dry-out function, which contains adjustable like fmdry epdry (in STARS...

Concern over global warming has increased interest in quantification of the dissolution CO2 (sub-)surface water. The mechanisms mass transfer aquifers and to surface water have many common features. advantage experiments using bulk is that underlying assumptions quantify mass-transfer rate can be validated. Dissolution into (or oil) increases density liquid phase. This change destabilizes interface enhances across by natural convection. paper describes a series performed cylindrical PVT-cell...

Foam has been employed as an improved or enhanced oil recovery method to overcome gravity override and the channeling fingering of injected gas, which arises because low density viscosity fluid combined with rock heterogeneity. A major challenge, however, is stability generated foam when it contacts oil. In this study we investigate feasibility using inexpensive nanoparticles made coal fly ash, abundantly available waste product power plants, a booster. We viability reducing size ash...

We present the results of an experimental investigation effect gas type and composition on foam transport in porous media. Steady-state strengths with respect to three cases distinct gases two containing binary mixtures these were compared. The effects solubility, stability lamellae, diffusion rate across lamellae examined. Our showed that steady-state strength is inversely correlated permeability a liquid lamella, parameter characterizes mass transport. are also good agreement existing...

Underground Hydrogen Storage (UHS) is an attractive technology for large-scale (TWh) renewable energy storage. To ensure the safety and efficiency of UHS, it crucial to quantify H2 interactions with reservoir fluids rocks across scales, including micro scale. This paper reports experimental measurements advancing receding contact angles different channel widths a H2/water system at P = 10 bar T 20 °C using microfluidic chip. analyse characteristics flow in straight pore throats, network...

Production of mature oil fields emits significant amount CO 2 related to circulation and handling large volumes gas water. This can be reduced either by (1) using a low-carbon energy source and/or (2) reducing the non-hydrocarbon produced/injected fluids. paper describes how improved recovery techniques designed reduce intensity (kgCO /bbl oil) production efficient use injectants. It is shown that emissions associated with injection chemicals strongly influenced water cut at start project,...

Foam is a promising means to assist in the permanent, safe subsurface sequestration of CO2, whether aquifers or as part an enhanced-oil-recovery (EOR) process. Here we review advantages demonstrated for foam that would CO2 sequestration, particular sweep efficiency and residual trapping, challenges yet be overcome. We also research field-trial literature on efficiency, capillary gas trapping foam, issues involved surfactant selection applications, field trials, state art from laboratory...

Injection of high-pressure CO2 into depleted gas reservoirs can lead to low temperatures promoting formation hydrate in the near wellbore area resulting reduced injection rates. The design effective mitigation methods requires an understanding impact crucial parameters on and dissociation within porous medium under flowing conditions. This study investigates influence water saturation (ranging from 20 % 40 %) kinetics during continuous injection. experiments were conducted a medical X-ray...

Carbon dioxide (CO2) has found wide application in the water-alternating-foam (WAF) processes for enhanced oil recovery (EOR), but few research works have been reported concerning effect of water solubility on CO2 foam rheology a porous medium. In this paper, an X-ray computed tomography (CT) study is carried out to investigate flow consolidated Bentheimer sandstone core saturated with surfactant solution under different system pressures. As contrast gas much lower solubility, nitrogen also...

Wettability plays a crucial role on the performance of enhancing oil recovery techniques because its effect fluid saturations and flow behavior in porous medium. This study is directed toward determining contact angles (i.e., wettability) systems with carbon dioxide, brine, an oil-saturated rock system. Two situations are considered: Rock system I partially water-wet, whereas II effectively oil-wet. Contact have been determined experimentally as function brine salinity pressure using...