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Modeling hydraulic fractures in finite difference simulators using amalgam local grid refinement (LGR)

Fig. 3 LGRs around the wellbore

Most of the current analytical techniques assume a single rectangular shaped fracture in a single-phase homogeneous reservoir, the fracture is limited to the block size and the fracture properties are adjusted using permeability multiplier. The current work demonstrates how to model these systems with a smaller grid block size which

Impact of Stress-Dependent Matrix and Fracture Properties on Shale Gas Production

Figure 4. (a)The schematic of reservoir and fracture configurations; (b–d) Matrix permeability for the three scenarios after five years’ production.

Moreover, the compaction of pore space will also increase the matrix permeability by enhancing the gas-slippage effect. In this paper, a matrix permeability model which couples the effect of pore volume compaction and non-Darcy slip flow is derived. Numerical simulations are conducted to understand the role of matrix permeability evolution

Evaluation of Microseismicity Related to Hydraulic Fracking Operations of Petroleum Reservoirs and Its Possible Environmental Repercussions

Figure 9. Plot of number of events and Pressure (psi) versus time (hours)since injection started in well CPU2-2, Giddings, Texas. Data from Reference [27].

In addition, the relationship between microseismic magnitude and both depth and injection parameters is examined to delineate the possible framework that controls the system. Generally, microseismicity of typical hydraulic fracturing and injection operations is relatively similar in the majority of basins under investigation and the overall associating seismic energy is

A numerical study on horizontal hydraulic fracture

Fig. 2 Sketch of the finite element mesh

The simulated bottom-hole pressure evolution is consistent with the data measured from the field. The configurations of the fracture and porous pressure distributions in the fracture are presented and discussed. Introduction Hydraulic fracturing has been one of the most frequently implemented techniques for stimulating production of oil/gas reservoirs for several decades (Sneddon

Selecting Oil Wells for Hydraulic Fracturing: A Comparison between Genetic-Fuzzy and Neuro Fuzzy Systems

Selecting Oil Wells for Hydraulic Fracturing A Comparison between Genetic-Fuzzy and Neuro Fuzzy Systems

Abstract Hydraulic fracturing is widely used to increase oil well production and to reduce formation damage. Reservoir studies and engineering analyses are carried out to select the wells for this kind of operation. As the reservoir parameters have some diffuse characteristics, Fuzzy Inference Systems (FIS) have been tested for these selection

Three-Dimensional Numerical Model of Hydraulic Fracturing in Fractured Rock Masses

Three-Dimensional Numerical Model of Hydraulic Fracturing in Fractured Rock Masses

Abstract Conventional methods for simulation of hydraulic fracturing are based on assumptions of continuous, isotropic and homogeneous media. These assumptions are not valid for most rock mass formations, particularly shale gas reservoirs, as these typically consist of a large volume of naturally fractured rock in which propagation of a hydraulic fracture

Characterizing hydraulic fractures in shale gas reservoirs using transient pressure tests

Hydraulic fracturing combined with horizontal drilling has been the technology that makes it possible to economically produce natural gas from unconventional shale gas or tight gas reservoirs. Hydraulic fracturing operations, in particular, multistage fracturing treatments along with horizontal wells in unconventional formations create complex fracture geometries or networks, which are difficult to characterize. The traditional analysis using a single vertical or horizontal fracture concept may be no longer applicable.

Abstract Hydraulic fracturing combined with horizontal drilling has been the technology that makes it possible to economically produce natural gas from unconventional shale gas or tight gas reservoirs. Hydraulic fracturing operations, in particular, multistage fracturing treatments along with horizontal wells in unconventional formations create complex fracture geometries or networks, which are

Simulation of proppant transport with gravitational settling and fracture closure in a three-dimensional hydraulic fracturing simulator

We implement proppant transport in a three-dimensional hydraulic fracturing simulator, including proppant settlement due to gravity, tip screen-out, and fracture closure. Constitutive equations are used that account for processes that can cause the flowing fraction of proppant to be different from the volumetric fraction of proppant. The constitutive equations capture the transition from Poiseuille flow to Darcy flow as the slurry transitions from dilute mixture to packed bed. We introduce new constitutive equations that allow the simulator to seamlessly describe the process of fracture closure, including a nonlinear joint closure law expressing fracture compliance and roughness and accounting for the effect of proppant accumulation into a packed layer between the fracture walls.

Abstract We implement proppant transport in a three-dimensional hydraulic fracturing simulator, including proppant settlement due to gravity, tip screen-out, and fracture closure. Constitutive equations are used that account for processes that can cause the flowing fraction of proppant to be different from the volumetric fraction of proppant. The constitutive equations capture

Study of Hydraulic Fracturing Real-time Evaluation Technology

Hydraulic fracturing real-time evaluation technology provides an effective way to understand formation and fracturing, assess the quality of fracturing construct, and ensure the safety of fracturing construction. In this paper, com- bined with numerical simulation and data analysis, a new 3D model of real-time fracture extension is established on the basis of the theories of fluid dynamics, linear elastic fracture mechanics and computational mathematics. This model satis- fies the requirement of hydraulic fracturing real-time with the advantage of simple in form, precise and fast in computa- tion. Considering the influence of proppant on the friction calculation of sand mixed fluids, a wellbore flow model is de- veloped, which is more widely used and makes it no need of down-hole data acquisition.

Abstract: Hydraulic fracturing real-time evaluation technology provides an effective way to understand formation and fracturing, assess the quality of fracturing construct, and ensure the safety of fracturing construction. In this paper, combined with numerical simulation and data analysis, a new 3D model of real-time fracture extension is established on the basis

Approaching a universal scaling relationship between fracture stiffness and fluid flow

Here we present a scaling relationship between fluid flow and fracture-specific stiffness that approaches universality. Fracture-specific stiffness is a mechanical property dependent on fracture geometry that can be monitored remotely using seismic techniques

Approaching a universal scaling relationship between fracture stiffness and fluid flow   Laura J. Pyrak-Nolte1,2,3 & David D. Nolte1 1 Department of Physics and Astronomy, Purdue University, 525 Northwestern Avenue, West Lafayette, Indiana 47907-2036, USA. 2Lyle School of Civil Engineering, Purdue University, West Lafayette, Indiana 47907-0395, USA. 3Department of Earth, Atmospheric and Planetary

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