Underground Hydrogen Storage (UHS) has received significant attention over the past few years as hydrogen seems well-suited for adjusting seasonal energy gaps. We present an integrated reservoir-well model "Viking A″ depleted gas field in North Sea, a potential site UHS. Our findings show that utilizing results more reasonable predictions composition changes time. Sensitivity analyses lighter cushion gas, production can be obtained. However, purity of produced will affected to some extent,...

Hydrogen storage in depleted gas fields is a promising option for the large-scale of excess renewable energy. In framework hydrogen assessment "Underground Sun Storage" project, we conduct multi-step geochemical modelling approach to study fluid–rock interactions by means equilibrium and kinetic batch simulations. With approach, estimate long-term consequences storage, whereas models are used investigate between formation on time scales typical cycles. The suggests that reactions with...

The equivalent permeability, of stratified fractured porous rocks and its anisotropy is important for hydrocarbon reservoir engineering, groundwater hydrology, subsurface contaminant transport. However, it difficult to constrain this tensor property as strongly influenced by infrequent large fractures. Boreholes miss them their directional sampling bias affects the collected geostatistical data. Samples taken at any scale smaller than that interest truncate distributions leads an incorrect...

Reservoir simulation using the extended Darcy's law approach requires relative permeability curves derived either via analytic saturation functions (Corey models etc.) or from special core analysis (SCAL). Since such experimental exploration of space influential parameters (pore geometry and wettability) is costly time consuming, establishing ways to extract ensemble numerical simulation, kri, over entire range water highly desirable. In this work, a Steady State Saturation Variation (SSSV)...

This study compares the calculated fracture apertures in a fragmented rock layer under different stress scenarios using two approaches. Approach 1 is simplified method two-dimensional (2D) mapping of network and projects far-field stresses to individual fractures, calculates dilation, normal shear displacements experimental stiffnesses available literature. 2 employs three-dimensional (3D) finite element (FEM) for mechanical analysis considering interaction with neighbouring layers,...

The equivalent permeability of layered fractured rocks plays an important role in hydrocarbon recovery, underground energy storage, waste disposal management, groundwater hydrology, and subsurface contaminant transport. Borehole data contain some uncertainties/sampling bias during collection interpretation. This sampling effect may lead to inaccurate characterization the media. Studies show that long fractures with high permeability, which are rarely seen borehole images, dominate flow...

Since more than half of the crude oil is deposited in naturally fractured reservoirs, research has been focused on characterizing and understanding fracture impact their production performance. Naturally open fractures are interpreted from Fullbore Formation Micro-Imaging (FMI) logs. According to aperture, they classified as major, medium, minor hairy decreasing order respective aperture size. Different types were set up this work a Discrete Fracture Network (DFN) synthetic models sector...

Multiphase flow in porous media is relevant many areas of geoenergy engineering and governed by relative permeability capillary pressure saturation functions. These functions are key uncertainties reservoir their measurement demanding resource intensive. Despite the experimental effort, it not yet common practice to numerically interpret data, nor investigate uncertainty. Furthermore, data interpretation limited power-law functions, which insufficient for describing complex rock types such...

Summary Geological/flow properties computed from a heterogeneous rock sample represent the of entire medium if size is larger than representative elementary volume (REV) rock. Among these properties, relative permeability believed to have most influence on multiphase-flow behavior. Therefore, much care must be taken ensure that has been beyond REV size. However, in literature, experimental and numerical evaluations are mostly performed without such care, saturation functions calculated at...

Summary The prediction of water breakthrough and oil recovery for naturally fractured reservoirs (NFRs) cannot be performed accurately without dynamic upscaled relative permeability functions. Relative is commonly assumed to a scalar quantity, although justification NFRs has yet presented. In this study, we show how accurate assumption fracture-matrix ensemble permeabilities determined by numeric simulations unsteady-state core flooding. Numerical determination requires realistic flow model,...

Abstract Relative permeability is a tensorial property directly dependent on absolute tensor which has been taking both symmetric and non-symmetric (full tensor) forms in the literature. Imposing symmetricity during upscaling effective phase permeabilities could alter diagonal off-diagonal terms of relative tensors, specifically naturally fractured reservoirs (NFRs) where components take values with different orders magnitude. Utilizing discrete fracture matrix (DFM) modelling approach, this...

Summary Fluid evidence shows that prediction of water breakthrough and oil recovery from fractured reservoirs cannot be performed accurately without upscaled relative permeability functions. Relative is commonly assumed to a scalar quantity, although the justification that—specifically for naturally (NFRs)—is rarely attempted. In this study, we investigate validity scalar-quantity assumption how it affects fracture/matrix equivalent permeabilities, kri(Sw), achieved by numerical simulation...

This work presents a significant advance over earlier methods because it employs surface-roughness based fracture dilation model to compute aperture distributions. From these, capillary pressure is computed before saturation functions are extracted. upscaling performed using an unsteady state approach evaluate the impact of on ensemble relative permeability and ultimate recovery. The simulation applied outcrop-based meter- kilometre-scale DFM models. For these geometries, attributes for...

This study examines the connections between various fracture indicators and production data with an example from one of giant fields in Middle East producing complex fractured carbonate lithologies. The field under hosts two reservoirs a long development history, including carbonates Asmari Bangestan Formations. A intensity map was generated based on interpretation image logs 28 wells drilled within field. Mud loss were collected mapped geostatistical Gaussian Random Function Simulation...

Abstract Underground biomethanation, which relies on the subsurface microbial activity to convert hydrogen and carbon dioxide into methane, is a promising approach support capture, utilization, storage technology. The process involves injecting with captured CO 2 depleted oil gas reservoirs or aquifers colonized by hydrogenotrophic methanogens that can these two substrates methane. Despite attractiveness of this technology, there are still uncertainties about efficiency conversion process,...

Summary Reservoir simulation using the extended Darcy's law requires relative permeability curves derived either via analytic saturation functions (Corey models etc.) or from special core analysis (SCAL). Since such experimental exploration of space influential parameters (pore geometry and wettability) is costly time consuming, establishing ways to extract ensemble numerical simulation, kri, over entire range water highly desirable. Our work focuses on finding accurate compute kri(sw) for...

Summary Geochemistry plays a great role when assessing the impact of hydrogen storage. With purpose discovering and characterizing minerals-brine interactions as consequence injection into depleted gas reservoir, we constructed an equilibrium geochemical model using, GEM-Selektor (GEMS) package. A reservoir from upper Austria, Molasse basin, has been selected candidate for Thermodynamic formation water minerals at in situ condition (P = 107 bar, T 40°C) was created to represent initial state...