Stress behavior in the near fracture region between adjacent horizontal wells during multistage fracturing using a coupled stress-displacement to hydraulic diffusivity model

Manriquez, Alberto Lopez

doi:10.1016/j.petrol.2017.11.009

Cited by 22 publications

(19 citation statements)

References 5 publications

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“…From the displacement results of the first stage of fracturing, as shown in Figure 7(a), the left side of the fracture can be seen to have exhibited positive values, while the right side has negative values caused by the expansion in fracture volume induced by fluid injection. These deformation distributions represent typical patterns of the displacement field around the fracture (Abdollahipour et al, 2016;Manríquez, 2018). Additionally, the deformations around Fracture 1 appear almost symmetric, causing the fracture to propagate in a planar pattern and not to exhibit deflection.…”

Section: Stratal Movement Induced By Multistage Propagation Of Three-dimensional Hydraulic Fracturesmentioning

confidence: 80%

“…Therefore, the cluster spaces between the initial perforations in a horizontal wells and fracturing scenarios (e.g. sequential, alternate and simultaneous fracturing) require further consideration; specifically, stratal movement and compressional effects should be analyzed (Alghannam and Rahim, 2014;Manríquez, 2018;Manríquez et al, 2017;Ziarani et al, 2014). However, few methods and technologies exist that may help elucidate the mechanisms of stratal movement and microseismicity in multistage fracturing.…”

Section: Introductionmentioning

confidence: 99%

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Adaptive finite element–discrete element analysis for stratal movement and microseismic behaviours induced by multistage propagation of three-dimensional multiple hydraulic fractures

Wang

2021

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Purpose Optimized three-dimensional (3D) fracture networks are crucial for multistage hydrofracturing. To better understand the mechanisms controlling potential disasters as well as to predict them in 3D multistage hydrofracturing, some governing factors, such as fluid injection-induced stratal movement, compression between multiple hydraulic fractures, fracturing fluid flow, fracturing-induced microseismic damaged and contact slip events, must be properly simulated via numerical models. This study aims to analyze the stratal movement and microseismic behaviours induced by multistage propagation of 3D multiple hydraulic fractures. Design/methodology/approach Adaptive finite element–discrete element method was used to overcome the limitations of conventional finite element methods in simulating 3D fracture propagation. This new approach uses a local remeshing and coarsening strategy to ensure the accuracy of solutions, reliability of fracture propagation path and computational efficiency. Engineering-scale numerical models were proposed that account for the hydro-mechanical coupling and fracturing fluid leak-off, to simulate multistage propagation of 3D multiple hydraulic fractures, by which the evolution of the displacement, porosity and fracture fields, as well as the fracturing-induced microseismic events were computed. Findings Stratal movement and compression between 3D multiple hydraulic fractures intensify with increasing proximity to the propagating fractures. When the perforation cluster spaces are very narrow, alternate fracturing can improve fracturing effects over those achieved via sequential or simultaneous fracturing. Furthermore, the number and magnitude of microseismic events are directly proportional to the stratal movement and compression induced by multistage propagation of fracturing fracture networks. Originality/value Microseismic events induced by multistage propagation of 3D multiple hydraulic fractures and perforation cluster spaces and fracturing scenarios that impact the deformation and compression among fractures in porous rock matrices are well predicted and analyzed.

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Section: Stratal Movement Induced By Multistage Propagation Of Three-dimensional Hydraulic Fracturesmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Adaptive finite element–discrete element analysis for stratal movement and microseismic behaviours induced by multistage propagation of three-dimensional multiple hydraulic fractures

Wang

2021

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“…By controlling the geometry of the adjacent fracture and the fluid pressure, we can artificially intervene in the stress [34]. In research on fracture direction control during secondary fracturing, there is a series of studies on the relationship between stress field reconstruction and fracture direction [35][36][37][38][39]. The results show that the stress can be changed by adjacent fractures to control the fracture direction.…”

Section: Manual Intervention Of Interface Slippage In Hydraulic Fractmentioning

confidence: 99%

An Investigation into the Effects of Weak Interfaces on Fracture Height Containment in Hydraulic Fracturing

2019

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Hydraulic fracturing is an effective method for developing unconventional reservoirs. The fracture height is a critical geometric parameter for fracturing design but will be limited by a weak interface. Fracture containment occurs when fracture propagation terminates at layer interfaces that are weaker than the surrounding rock. It always occurs in multilayer formation. Therefore, the mechanism of fracture height containment guides fracture height control in hydraulic fracturing. In order to study the fracture containment mechanism, this paper first calculates the propagation behaviour of the fracture in 3D under the influence of a weak interface through a block discrete element method and analyzes the geometric characteristics of the fracture after it meets the weak interface. Then, the induced stress of the hydraulic fracture on the weak interface is calculated by fracture mechanics theory, and the mechanism of blunting at the fracture tip is explained. Then, two kinds of interface slippage that can lead to blunting of the fracture tip are discussed. Based on the behavior of shear slippage at the interface, a control method for multilayer fracturing in thin sand-mud interbed and pay zone fracturing in shale is proposed. The results show that the fracture height is still limited by the weak interface in the formation without the difference of in-situ stress and rock properties. Interface slippage is the main factor impeding fracture propagation. Fracture height containment can be adjusted and controlled by changing the angle between the hydraulic fracture, the interface, and the stress state to strengthen and stiffen the interface. This study has a certain guiding significance for fracture height control in the design of hydraulic fracturing of shale or thin sand-mud interbed reservoirs.

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“…Therefore, additional numerical methods and models have been proposed to study these complex effects. − The influence of the stress shadow effect and other fracturing parameters on fracture interaction behavior was studied using the extended finite element method (XFEM). , Other studies have combined the XFEM and discrete element method (DEM) to study the propagation law of hydraulic fractures in porous media containing natural fracture blocks . The finite element method (FEM) or combined finite element-DEM (FE-DE method or FDEM) was used to simulate fracture propagation; − based on the adaptive mesh refinement techniques. , Several of these methods have developed analysis models with high-precision stress solutions in hydraulic fracture propagation. To simulate and analyze the fracture propagation behavior and stress field evolution in hydrofracturing, numerical models should be flexibly built according to the specific conditions of the research object. , The stress shadow size and pore size of unconventional shales in hydrofracturing were analyzed by combining the FEM of a simple fracture geometry with an analytical solution of 2D hydraulic fractures .…”

Section: Introductionmentioning

confidence: 99%

Stress-Dependent Unstable Dynamic Propagation of Three-Dimensional Multiple Hydraulic Fractures with Improved Fracturing Sequences in Heterogeneous Reservoirs: Numerical Cases Study via Poroelastic Effective Medium Model

Wang

Liu

2021

Energy Fuels

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Multistage hydrofracturing of horizontal wells is one of the key technologies for deep tight oil and gas resource exploitation. The stable and parallel propagation of multiple fractures formed by multistage perforation cluster fracturing is conducive to the formation of a developed fracture network. However, in the actual process of rock fracturing in deep tight reservoirs, owing to the influence of many factors, such as fracturing sequence, perforation cluster space, reservoir heterogeneity, and stress shadow effect, the three-dimensional (3D) fracture network that propagates unsteadily of multiple fractures is often formed. This has become an important problem limiting artificial transformation and in optimizing fracture networks. In view of the above difficulties, a 3D finite element–discrete element model considering fluid–solid coupling and fracturing fluid leak-off effect is proposed to simulate hydrofracturing, and an effective medium model to describe heterogeneous reservoir rock mass is established. Several typical fracturing sequences (sequential, alternate, simultaneous, and two improved alternate scenarios), perforation cluster spaces (100, 75, 50, and 25 m), and heterogeneous reservoir conditions were analyzed. The spatial unstable propagation, stress field interference, and evolution behavior of the pressure fracture network were simulated, and the quantitative results of the dynamic propagation shape, fracture propagation area, and spatial volume of the pressure fracture network were obtained. The numerical results show that when the perforation cluster space decreases, the stress shadow effect between hydraulic fractures intensifies, and the 3D fracture exhibits unstable propagation and spatial deflection. Compared with sequential and simultaneous fracturing, all types of improved alternate fracturing can effectively reduce the stress interference between fractures, fracture deflection, and form the developed fracture network area. Compared with the homogeneous reservoir model, the heterogeneity of the reservoir rock mass becomes an important factor that limits the propagation of the fracture network. These results can provide a basis for understanding the mechanisms of stress-dependent unstable dynamic propagation of 3D multiple hydraulic fractures of improved fracturing sequences in heterogeneous reservoirs.

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Stress behavior in the near fracture region between adjacent horizontal wells during multistage fracturing using a coupled stress-displacement to hydraulic diffusivity model

Cited by 22 publications

References 5 publications

Adaptive finite element–discrete element analysis for stratal movement and microseismic behaviours induced by multistage propagation of three-dimensional multiple hydraulic fractures

Adaptive finite element–discrete element analysis for stratal movement and microseismic behaviours induced by multistage propagation of three-dimensional multiple hydraulic fractures

An Investigation into the Effects of Weak Interfaces on Fracture Height Containment in Hydraulic Fracturing

Stress-Dependent Unstable Dynamic Propagation of Three-Dimensional Multiple Hydraulic Fractures with Improved Fracturing Sequences in Heterogeneous Reservoirs: Numerical Cases Study via Poroelastic Effective Medium Model

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