A New Criterion for a Toughness-Dominated Hydraulic Fracture Crossing a Natural Frictional Interface

Zhao, Yu; He, Pengfei; Zhang, Yongfa; Wang, Chaolin

doi:10.1007/s00603-018-1683-y

Cited by 87 publications

(24 citation statements)

References 24 publications

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“…Yin [20] supposed that water inrush channel played a key role in floor water inrush, so he puts forward the concept of "strong seepage channel". Zhao et al [21][22][23] studied the flow law of water in fractures and further proved that fractures or damaged areas were the channels of underground water inrush. It can be seen that the surrounding rock failure area is an important water diversion channel during water inrush.…”

Section: Introductionmentioning

confidence: 99%

Surrounding Rock Failure Characteristics and Water Inrush Mechanism of Roadway above the Aquifer in Nonuniform Stress Field

Guo

et al. 2021

Geofluids

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The expansion of the roadway surrounding rock failure zone may connect the floor aquifer and cause the roadway water inrush. In order to reveal the mechanism of the roadway water inrush above confined water, we established the force model of the roadway surrounding rock above confined water in nonuniform stress field and studied the shape characteristics and expansion law of the roadway surrounding rock plastic zone. The results show that the roadway surrounding rock will form three kinds of plastic zone under different lateral pressure coefficients: circular, elliptical, and butterfly; when the shape of plastic zone is circular or elliptic, the maximum radius increases linearly with the increase of regional stress; when the shape is butterfly, the maximum radius increases exponentially with the increase of stress. Under the condition of a larger bidirectional stress ratio, the surrounding rock of the roadway will show butterfly-shaped failure, and small stress change will cause malignant expansion of the plastic zone; when the plastic zone is connected with the underlying aquifer, confined water of floor will enter the rock mass from the water diversion point and eventually flood into the roadway, causing floor water inrush.

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Section: Introductionmentioning

confidence: 99%

Surrounding Rock Failure Characteristics and Water Inrush Mechanism of Roadway above the Aquifer in Nonuniform Stress Field

Guo

et al. 2021

Geofluids

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“…The geometry of hydraulic fractures growing in the vicinity of an interlayer is predominantly controlled by the difference in Young's modulus, Poisson's ratio, and permeability between the interlayer and oil-bearing layers [5,6,12,[19][20][21][41][42][43]. When the material parameters of the layers are known, the fracturing fluid properties are of pivotal importance to propagation configuration.…”

Section: Introductionmentioning

confidence: 99%

The Influence of an Interlayer on Dual Hydraulic Fractures Propagation

Tang

Rutqvist

et al. 2020

Energies

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Multi-cluster hydraulic fracturing of long-range horizontal wells is an approach for enhancing the productivity of low-permeability shale reservoirs. In this study, RFPA-Petrol (rock failure process analysis on petroleum problems) is applied for modeling hydraulic fracture propagation in multilayered formations. RFPA-Petrol based on coupled hydraulic-mechanical-damage (HMD) modeling was first tested by modeling a laboratory scale experiment on a physical (cement) model with a single completion. The modeling demonstrated the capability of RFPA-Petrol for simulating hydraulic fracture propagation. Then, we used RFPA-Petrol to investigate how the difference in material properties between oil-bearing layers and interlayers and the fracturing fluid properties influence the propagation of dual fractures in multilayered laboratory-scale models. In this case, the models with geological discontinuities in the vertical direction are strongly heterogeneous and RFPA-Petrol simulations successfully modeled the fracture configurations.

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“…Permeability is one of the most critical reservoir parameters for shale and tight gas reservoirs characterization and well‐performance evaluation because it affects the production rate, the pace of recovery, and the technically recoverable hydrocarbons . However, an accurate measurement of shale and tight reservoirs is challenging due to the low/ultralow permeability and heterogeneous nature of shale formations …”

Section: Introductionmentioning

confidence: 99%

“…1 However, an accurate measurement of shale and tight reservoirs is challenging due to the low/ultralow permeability and heterogeneous nature of shale formations. 2 A lot of experimental techniques have been developed to measure shale and tight gas reservoirs permeability. These techniques can be divided into two categories: steady-state and unsteady-state.…”

Section: Introductionmentioning

confidence: 99%

A method for simultaneously determining axial permeability and transverse permeability of tight reservoir cores by canister degassing test

Zhao

Wang

2019

Energy Science & Engineering

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Permeability anisotropy of shale and tight gas reservoirs is critical for applications in unconventional gas recovery, but laboratory measurements are still limited. This paper presents an experimental method for determining permeability anisotropy of shale and tight reservoirs. The method uses gas production data from a canister and an analytical solution of continuity equation in anisotropic core sample. Axial permeability and transverse permeability of the core are estimated by matching experimental data with analytical solution. The proposed method is verified by comparing with true values and calculated values through numerical simulations that cover variations in rock permeability. The method is applied to real data measured in canister degassing tests (CDT) involving two different directional shale core samples. Then, the experimental results are compared with the results from pulse pressure decay (PPD) method. Both the verification from numerically calculated results and the comparison between PPD results and CDT results exhibit the practicality of the proposed method. At last, the effects of permeability anisotropy, porosity, initial gas pressure, rock dimensions, and adsorption on the profiles of gas production are investigated.

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A New Criterion for a Toughness-Dominated Hydraulic Fracture Crossing a Natural Frictional Interface

Cited by 87 publications

References 24 publications

Surrounding Rock Failure Characteristics and Water Inrush Mechanism of Roadway above the Aquifer in Nonuniform Stress Field

Surrounding Rock Failure Characteristics and Water Inrush Mechanism of Roadway above the Aquifer in Nonuniform Stress Field

The Influence of an Interlayer on Dual Hydraulic Fractures Propagation

A method for simultaneously determining axial permeability and transverse permeability of tight reservoir cores by canister degassing test

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