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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 The traditional analysis using a single vertical or horizontal fracture concept may be no longer applicable.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

Simulating the hydraulic stimulation of multiple fractures in an anisotropic stress field applying the discrete element method

The current study investigates hydraulic fracture stimulation for an Enhanced Geothermal System (EGS) in a petrothermal environment to evaluate stress shadowing and fracture interaction in a multi-fracture setup. Previous studies investigated the geothermal potential of the area around Freiberg (Saxony, Germany), which is therefore used as a case example. The commercial discrete element code 3DEC™ is applied to conduct the numerical simulations. The simulation results show that hydraulic fracture stimulation results in a strong stress field alteration, which significantly influences the propagation of subsequently stimulated fractures. The resulting deflection of fractures can be minimized applying an optimized stimulation concept.

Simulating the hydraulic stimulation of multiple fractures in an anisotropic stress field applying the discrete element method   Conny Zeeba, Heinz Konietzkya aGeotechnical Institute, TU Bergakademie Freiberg, Gustav-Zeuner-Str. 1, 09599 Freiberg, Germany   Abstract The current  study  investigates  hydraulic  fracture  stimulation  for an Enhanced  Geothermal  System  (EGS)  in a petrothermal environment  to evaluate stress shadowing and

A Comprehensive Model for Real Gas Transport in Shale Formations with Complex Non-planar Fracture Networks

Case 1 is the simple planar hydraulic fracture; Case 2 is the non-planar hydraulic fracture; Case 3 is the simple planar natural fracture; Case 4 is the non-planar natural fracture; Case 5 is the simple planar natural fracture network; Case 6 is the non-planar natural fracture network.

A Comprehensive Model for Real Gas Transport in Shale Formations with Complex Non-planar Fracture Networks   Ruiyue Yang1, Zhongwei Huang1, Wei Yu2, Gensheng Li1, Wenxi Ren1, Lihua Zuo2, Xiaosi Tan2, Kamy Sepehrnoori3, Shouceng Tian1 & Mao Sheng1 1State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, P.R. China.

A Numerical Investigation of Fault Slip Triggered by Hydraulic Fracturing

The study of fault slip in response to fluid injection offers a means to understand the complex hydromechanical behavior of shale gas and oil reservoir systems during hydraulic fracturing operations, together with the induced seismicity, and corresponding mitigation measures, arising from such events. In this paper, a series of numerical simulations are performed to investigate the relationship between hydraulic fracturing (i.e. fluid injection) and the response of a naturally fractured rock mass to transient fluid pressures.

A Numerical Investigation of Fault Slip Triggered by Hydraulic Fracturing Neda Zangeneh, Erik Eberhardt, R. Marc  Bustin and Amanda Bustin University of British Columbia, Vancouver, British Columbia, Canada Abstract The study of fault slip in response to fluid injection offers a means to understand the complex hydromechanical behavior of shale gas and oil reservoir

Microseismic Imaging of Hydraulically Induced-Fractures in Gas Reservoirs: A Case Study in Barnett Shale Gas Reservoir, Texas, USA

Microseismic technology has been proven to be a practical approach for in-situ monitoring of fracture growth during hydraulic fracture stimulations. Microseismic monitoring has rapidly evolved in acquisition methodology, data processing, and in this paper, we evaluate the progression of this technology with emphasis on their applications in Barnett shale gas reservoir.

Microseismic Imaging of Hydraulically Induced-Fractures in Gas Reservoirs: A Case Study in Barnett Shale Gas Reservoir, Texas, USA   Abdulaziz M. Abdulaziz Mining, Petroleum, and Metallurgical Engineering Department, Faculty of Engineering, Cairo University, Giza, Egypt Abstract Microseismic technology has been proven to be a practical approach for in-situ monitoring of fracture growth during hydraulic fracture

Investigation of Fracturing Network Propagation in Random Naturally Fractured and Laminated Block Experiments

Researchers have recently realized that silty laminas are very developed in naturally fractured continental sedimentary formations in the Ordos Basin(China). Studies have shown that silty laminas are significant to improve the physical properties and gas storage capacity, and the natural fractures interact with the hydraulic fractures to maximize the fracture network during hydraulic fracturing.

Investigation of Fracturing Network Propagation in Random Naturally Fractured and Laminated Block Experiments Yu Wang, Xiao Li *, Jianming He, Zhiheng Zhao and Bo Zheng Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China Abstract: Researchers have recently realized that silty laminas are very

Selection of the optimal completion of horizontal wells with multi-stage hydraulic fracturing of the low-permeable formation, field C

Selection of the optimal completion of horizontal wells with multi-stage hydraulic fracturing of the low-permeable formation

Selection of the optimal completion of horizontal wells with multi-stage hydraulic fracturing of the low-permeable formation, field C Author: A.M. Bozoev1 and E.A. Demidova2 1-Gazpromneft Muravlenko, Muravlenko, Russia, 2-Tomsk Polytechnic University, Tomsk, Russia Abstract At  the  moment,  many  fields  of  Western  Siberia  are  in  the  later  stages  of development. In this regard, the multilayer

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