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A Fully Three Dimensional Semianalytical Model for Shale Gas Reservoirs with Hydraulic Fractures

Figure 2. Illustrations of dimensionless pressure distributions for various shapes of fractures.

A Fully Three Dimensional Semianalytical Model for Shale Gas Reservoirs with Hydraulic Fractures   The shale gas diffusion equations considers complex transport mechanism such as gas slippage and gas diffusion. This semianalytical model is verified with a commercial software and an analytical method for single fully penetrated rectangle fracture, and the production

Hydraulic Fracture Design with a Proxy Model for Unconventional Shale Gas Reservoir with Considering Feasibility Study

Figure 6. Natural fracture generation and upscaling in 3D grid systems—(a) natural fracture generation, (b) fracture porosity, (c) sigma factor, (d) fracture permeability, x, (e) fracture permeability, y, and (f) facture permeability, z.

Hydraulic Fracture Design with a Proxy Model for Unconventional Shale Gas Reservoir with Considering Feasibility Study The proxy model uses a robust regression scheme and can replace a commercial reservoir simulator. The proxy model proposed can determine the influence of impact factors on the production at each production time. The calculation

Numerical Study of Simultaneous Multiple Fracture Propagation in Changning Shale Gas Field

Figure 1. Three transverse fractures with a uniform spacing of 23.3 m in a single stage.

Numerical Study of Simultaneous Multiple Fracture Propagation in Changning Shale Gas Field A series of case studies were investigated to analyze the effects of engineering parameters on simultaneous multiple fracture propagation. The fracture spacing, perforating number, injection rate, fluid viscosity and number of fractures within one stage were considered. The simulation

An Analytical Model for Capturing the Decline of Fracture Conductivity in the Tuscaloosa Marine Shale Trend from Production Data

Figure 1. Schematic chart between two fractures. (a) Virtual boundary between two fractures. (b) Schematic chart of pressure distribution.

An Analytical Model for Capturing the Decline of Fracture Conductivity in the Tuscaloosa Marine Shale Trend from Production Data Production data analyses with the model revealed that the pressure-dependent fracture conductivity in the TMS in the Mississippi section declines following a logarithmic mode, with dimensionless coefficient χ varying between 0.116 and

Analysis of Pressure Communication between the Austin Chalk and Eagle Ford Reservoirs during a Zipper Fracturing Operation PART 2

Analysis of Pressure Communication between the Austin Chalk and Eagle Ford Reservoirs

PART 2 Analysis of Pressure Communication between the Austin Chalk and Eagle Ford Reservoirs during a Zipper Fracturing Operation Interpretation of Results The principal purpose of our study is to develop a conceptual model for the observed pressure communication between the two reservoirs (Eagle Ford and Austin Chalk). The estimated pressure acting on

Analysis of Pressure Communication between the Austin Chalk and Eagle Ford Reservoirs during a Zipper Fracturing Operation

Figure 2. (a) RELLIS wellbore trajectories. The white arrows represent the surface location of each well. The dotted outline represents the landing zone.

Analysis of Pressure Communication between the Austin Chalk and Eagle Ford Reservoirs during a Zipper Fracturing Operation Our study presents field data collected in fall 2017 that measured the annular pressure changes that occurred in Austin Chalk wells during the zipper fracturing treatment of two new wells in the underlying Eagle

Integrating Embedded Discrete Fracture and Dual-Porosity, Dual-Permeability Methods to Simulate Fluid Flow in Shale Oil Reservoirs

Figure 1. Fracture density and fracture length correlation.

Integrating Embedded Discrete Fracture and Dual-Porosity, Dual-Permeability Methods to Simulate Fluid Flow in Shale Oil Reservoirs Most previous simulation studies have been based on dual porosity, but simulation results from dual-porosity models have not been as accurate as discrete fracture models in composition modeling. This study proposes a new model that integrates

Shale Reservoir Drainage Visualized for a Wolfcamp Well (Midland Basin, West Texas, USA)

Figure 11. (a–c) Row 1: Pressure contour maps (in MPa) after 1 month drainage for the same central region of Figure 9d, now including flow through micro-cracks normal to the main fractures.

Shale Reservoir Drainage Visualized for a Wolfcamp Well (Midland Basin, West Texas, USA) The visualization of flow near hypothetical micro-cracks normal to the main fractures in a Wolfcamp well shows such micro-cracks support the recovery of hydrocarbons from deeper in the matrix, but still leave matrix portions un-drained with the concurrent

Optimization of huff-n-puff gas injection in shale oil reservoirs

Fig. 4. Well bottom-hole pressure (dot points are actual data, and line is simulated data).

The numerical simulation results and discussions show that the optimum huff time is so long that the pressure near the wellbore reaches the set maximum injection pressure during the huff period; and the optimum puff time is the time required for the pressure near the wellbore to reach the set

Exploitation of fractured shale oil resources by cyclic CO2 injection

Fig. 1 Proppant transport scenarios (Cipolla et al. 2010)

In this paper, we address the question whether we should exploit or confine the fracture complexity for CO2-EOR in shale oil reservoirs. Two proppant transport scenarios were simulated in this paper: Case 1—the proppant is uniformly distributed in the complex fracture system, propagating a partially propped or un-propped fracture network;

Converting Eclipse Data Deck to Petrel Case (Petrel 2011.1)

Figure 2: Case Conversion processing illustration

Figure 1: Case Conversion in Petrel Online Manual Case Conversion Methodology In Petrel, reverse engineering and case conversion are different terms for the same process of converting Eclipse data deck in Petrel case. Petrel needs .DATA, the associated grid and .INIT files to perform the case conversion. Petrel distinguishes the GRID|EDIT section properties which

Reservoir and Fracture Modelling: Connection Factor Export for Fractured Cells

Figure 4 Areal resolution 240x240 ft, with (red) and without (green) the skin calculation. The thick line is a simulation on 7.5x7.5 ft cells.

In case the fracture cell is small (smaller than Peaceman radius) then we recommend setting the diameter of the wellbore in the global completion to a small value so that the Peaceman radius will not be smaller than the wellbore radius. If running ECLIPSE Compositional it is possible to use the

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. 15 Effect of the injected gas on oil viscosity (molar diffusion mechanism is OFF). a Natural gas, b CO2

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.

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

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