Numerical simulation of crack propagation in layered formations

Behnia, Mahmoud; Goshtasbi, Kamran; Marji, Mohammad Fatehi; Golshani, Aliakbar

doi:10.1007/s12517-013-0885-6

Cited by 26 publications

(6 citation statements)

References 20 publications

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“…It is well known that hydraulic fractures prefer to activate the weak planes in the propagation of hydraulic fractures, due to their much lower tensile and shear strength [46][47][48]. This could lead to a complex fracture network.…”

Section: Influence Of the Bedding Planes On The Design Of Horizontal mentioning

confidence: 99%

A Case Study on the Optimal Design of the Horizontal Wellbore Trajectory for Hydraulic Fracturing in Nong’an Oil Shale

et al. 2020

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A horizontal well with hydraulic fractures is key to forming a fracture network in oil shale for the generated hydrocarbon flows. By considering the influence of anisotropic strength, a prediction model is proposed for fracture initiation by studying different fracture initiation modes (FIMs) in oil shale: failure of the intact rock matrix and of the bedding planes. Through a case study on Nong’an oil shale, the influences of wellbore trajectory and bedding planes on the fracture initiation pressure (FIP), location (FIL), and FIM were analyzed and the induced changes in wellbore trajectory design were concluded. The preferred angle between the wellbore axis and the minimum horizontal principal stress was the same of 90° or 270°, when the lowest required FIP corresponded to the failure of the intact rock matrix. However, when the angle corresponded to the failure of the bedding planes, the preferred direction of the wellbore axis was away from the fixed direction and not corresponding to the lowest required FIP due to the fracture morphology. The error between the theoretical and experimental results ranges from 7% to 9%. This research provides a framework for the design of horizontal wellbore trajectories in oil shale, for easier fracture initiation and more complex fracture networks.

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Section: Influence Of the Bedding Planes On The Design Of Horizontal mentioning

confidence: 99%

A Case Study on the Optimal Design of the Horizontal Wellbore Trajectory for Hydraulic Fracturing in Nong’an Oil Shale

et al. 2020

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“…They mainly studied the effect of modulus contrast on hydraulic fracture propagation behavior in layered reservoirs without considering other factors, such as tensile strength, Poisson's ratio, and formation permeability. Behnia et al [24] presented a boundary element method based on the higher order displacement discontinuity formulation to solve the general problem of hydraulic fracture propagation in layered formations. Guo et al [25] studied the hydraulic fracture propagation path in heterogeneous formation under anisotropic in situ stress using the phase field method, in which the influence of reservoir elastic modulus was mainly discussed.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study of Hydraulic Fracture Propagation Geometry in a Layered Shale Reservoir

Zhang

Dong

et al. 2022

Geofluids

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An unconventional shale reservoir commonly develops multiple layers and shows strong anisotropy in mechanical properties, which has a great effect on hydraulic fracture propagation geometry. The most common mechanical properties are elastic modulus, Poisson’s ratio, tensile strength, and formation permeability. Therefore, the extended finite element method- (XFEM-) based cohesive zone model (CZM) is applied to analyze the effect of these mechanical properties on both the fracture propagation geometry and breakdown pressure in a layered shale reservoir after verifying the present numerical method by published analytical results. The parametric analysis indicates that the stiff or soft outer layers limit the fracture propagation width, while promoting the fracture propagation length. Higher Poisson’s ratio and formation permeability in outer layers narrow the fracture propagation width in middle layer. Poisson’s ratio contrast between different layers almost has no significant effect on the fracture propagation length and breakdown pressure. The hydraulic fracture propagation geometry presents the trend of “shorter and wider” with the increase of the tensile strength in outer layer. For asymmetric specimen with different mechanical parameters in each layer, hydraulic fracture shows an asymmetric propagation behavior, and hydraulic fracture preferentially propagates to the layer with higher elastic modulus, Poisson’s ratio, formation permeability, and low resistance.

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“…It should be noted that in addition to having an abrasive environment, rocks are heterogeneous with different physical and mechanical properties [12][13][14][15]. Crack coalescence is a significant phenomenon produced in rocks during the cutting process [16]; thus, it is necessary to provide a simulation of the crack's propagation and the effect of the in-situ stresses on the mechanical specific energy PDC cutter as shown in [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Influence of Heavy Weight Drill Pipe Material and Drill Bit Manufacturing Errors on Stress State of Steel Blades

et al. 2021

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Drilling volumes should be increased in order to increase hydrocarbon production, but this is impossible without the usage of high-quality drilling tools made of modern structural materials. The study has to analyze the design, technological and operational methods to increase the performance of drilling tools made of various materials and has highlighted prospects of technological method applications. The scientific novelty of the study consists in the development of a new analytical model of PDC drill bit–well interaction. The developed model takes into account the drill bit manufacturing errors in the form of bit body–nipple axes misalignment on the drill bit strength. This result makes it possible to determine the permissible manufacturing errors to provide safe operation of the drill bit. It is established that there is an additional transverse force that presses the drill bit to the well wall in the rock due to manufacturing errors. It is determined that the magnitude of this clamping force can be significant. The material effect has been analyzed on additional clamping force. It is established that geometric imperfection of the drill bit causes the minimal effect for the elastic system of the pipe string, which includes a calibrator and is composed of drill pipes based on composite carbon fiber material, and the maximal effect—for steel drill pipes. Polycrystalline diamond compact (PDC) drill bit and well wall contact interaction during operation in non-standard mode is considered. Non-standard stresses are determined, and the strength of the blades is estimated for different values of drilling bit manufacturing error.

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Numerical simulation of crack propagation in layered formations

Cited by 26 publications

References 20 publications

A Case Study on the Optimal Design of the Horizontal Wellbore Trajectory for Hydraulic Fracturing in Nong’an Oil Shale

A Case Study on the Optimal Design of the Horizontal Wellbore Trajectory for Hydraulic Fracturing in Nong’an Oil Shale

A Numerical Study of Hydraulic Fracture Propagation Geometry in a Layered Shale Reservoir

Influence of Heavy Weight Drill Pipe Material and Drill Bit Manufacturing Errors on Stress State of Steel Blades

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