You are here
Home > Reservoir Simulation

A numerical simulation study of CO2 injection for enhancing hydrocarbon recovery and sequestration in liquid-rich shales

Less than 10% of oil is usually recovered from liquid-rich shales and this leaves much room for improvement, while water injection into shale formation is virtually impossible because of the extremely low permeability of the formation matrix. Injecting carbon dioxide (CO2) into oil shale formations can potentially improve oil recovery. Furthermore, the large surface area in organic-rich shale could permanently store CO2 without jeopardizing the formation integrity. This work is a mechanism study of evaluating the effectiveness of CO2-enhanced oil shale recovery and shale formation CO2 sequestration capacity using numerical simulation.

Petrophysical and fluid properties similar to the Bakken Formation are used to set up the base model for simulation. Result shows that the CO2 injection could increase the oil recovery factor from 7.4% to 53%. In addition, petrophysical characteristics such as in situ stress changes and presence of a natural

Numerical simulation study on miscible EOR techniques for improving oil recovery in shale oil reservoirs

Fig. 5 a Average pressure in a depleted well in Bakken. b A closed view for SRV of production well

Firstly, numerical simulation methods of compositional models have been incorporated with local grid refinement of hydraulic fractures to mimic the performance of these miscible gases in shale reservoirs conditions. Implementation of a molecular diffusion model in the LS-LR-DK (logarithmically spaced, locally refined, and dual permeability) model has been also conducted.

Influence of gas transport mechanisms on the productivity of multi-stage fractured horizontal wells in shale gas reservoirs

Influence of gas transport mechanisms on the productivity of multi-stage fractured horizontal wells in shale gas reservoirs

The existence of an adsorption layer on the nanopore surfaces reduces the effective pore radius and the effective porosity, resulting in low production from fractured horizontal wells. With a decrease in the pore radius, considering the adsorption layer, the production reduction rate increases. When the pore radius is less than

Shale gas simulation considering natural fractures, gas desorption, and slippage flow effects using conventional modified model

Fig. 9 Schematic map of vertical well, fractured vertical well, horizontal well, fractured horizontal well in shale gas reservoirs

The input rock table considers the changes of rock permeability versus pressure to describe the gas slippage flow effects. In addition, dual-porosity dual-permeability models coupled with local grid refinement method are used to distinguish the impacts of natural fractures and hydraulic fractures on shale gas production with the comparison of

A Technical Review on Shale Gas Production and Unconventional Reservoirs Modeling

A Technical Review on Shale Gas Production and Unconventional Reservoirs Modeling

Abstract During the past several years, natural gas production from shale gas is increased and has adsorbed much attention worldwide. The reason behind this is because of advances gained in shale gas recovery techniques from this ultra-low permeability/porosity rock. These techniques are considered the horizontal drilling of the length of 3000

Productivity Model for Shale Gas Reservoir with Comprehensive Consideration of Multi-mechanisms

Productivity Model for Shale Gas Reservoir with Comprehensive Consideration of Multi-mechanisms

Abstract: Multi-stage fracturing horizontal well currently has been proved to be the most effective method to produce shale gas. This method can activate the natural fractures system defined as stimulated reservoir volume (SRV), the remaining region similarly is defined as un-stimulated reservoir volume (USRV). At present, no type curves have been

Well test, rate transient analysis and reservoir simulation for characterizing multi-fractured unconventional oil and gas reservoirs

Also at the well location, although the well may penetrate a productive shale, but in the same interval, away from the well location there might be non-productive shale sections. In other words, in unconventional shale reservoirs, productive shale zones and non-productive shale sections have randomly been distributed as illustrated in Fig. 3.

Abstract Unconventional reservoirs such as shale gas and shale oil have become an increasingly important source of energy in the USA with potential reservoirs identified worldwide. Due to the insufficient permeability of the shale reservoirs, they require efficient stimulation using multistage hydraulic fractures to produce gas  in commercial quantities. A critical

Unconventional Shale Reservoir’s Property Estimation through Modeling, Case Studies of Australian Shale

In this approach, a multi-fractured horizontal gas well in a shale formation is divided into four zones. Shale formation between each pair of hydraulic fractures consists of four zones: compacted zone around well-bore (1), shale matrix (2), induced fractures (3) and main hydraulic fractures (4). The main contribution of this study is considering varying permeability for each specific zone implemented in the mathematical presentation of gas flow in shale.

Unconventional Shale Reservoir’s Property Estimation through Modeling, Case Studies of Australian Shale   Robert Shiver*, Kim Nelsen, Eifei Li, John Lee, Grad Dwithes Cooper Clean Energy Inc., Sydney, Australia   Abstract A simplified approach is introduced to model production from shale gas resources. In this approach, a multi-fractured horizontal gas well in a shale formation is

Simulation Study of CO2-EOR in Tight Oil Reservoirs with Complex Fracture Geometries

We build a compositional reservoir model to investigate the effects of complex fracture geometries on performance of CO2 Huff-n-Puff and CO2 continuous injection. The results confirm that the appropriate modelling of the fracture geometry plays a critical role in the estimation of the incremental oil recovery.

Simulation Study of CO2-EOR in Tight Oil Reservoirs with Complex Fracture Geometries Pavel Zuloaga-Molero1, Wei Yu2, Yifei Xu1, Kamy Sepehrnoori1 & Baozhen Li3 1Department of Petroleum and Geosystems Engineering, University of Texas at Austin, Austin, TX, 78712,  USA. 2Department of Petroleum Engineering, Texas A&M University, College Station, TX, 77843, USA. 3CNOOC Research

Modeling and Simulation of Natural Gas Production from Unconventional Shale Reservoirs

Modeling and simulation of unconventional reservoirs are much more complicated than the conventional reservoir modeling, because of their complex flow characteristics. Mechanisms, which control the flow in the reservoir, are still under the investigation of researchers.

Modeling and Simulation of Natural Gas Production from Unconventional Shale Reservoirs Gary Feast1, Kim Wu1, John Walton2, Zufang Cheng2, Bao Chen2  1Novel Energy, Inc., Pittsburgh, PA, USA. 2Subsurface Shale Group, Columbus, OH, USA Abstract Modeling and simulation of unconventional reservoirs are much more complicated than the conventional reservoir modeling, because of their complex flow

Top