3D finite element modeling of directional hydraulic fracturing based on deformation reinforcement theory

Deng, Jianqiang; Yang, Qiang; Liu, Yaoru; Liu, Yi; Zhang, Guoxin

doi:10.1016/j.compgeo.2017.09.002

Cited by 15 publications

(8 citation statements)

References 52 publications

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“…Directional hydraulic fracturing guided by a guiding groove [31][32][33][34]: as the first directional hydraulic fracturing method, it was developed by the Polish General Institute of mining research to weaken the hard roof of the coal mine. The stress concentration of the annular groove leads the borehole to crack along the slotting direction.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on Basic Law of Dense Linear Multihole Directional Hydraulic Fracturing

Zhang

2021

Geofluids

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Using the dense linear multihole to control the directional hydraulic fracturing is a significant technical method to realize roof control in mining engineering. By combining the large-scale true triaxial directional hydraulic fracturing experiment with the discrete element numerical simulation experiment, the basic law of dense linear holes controlling directional hydraulic fracturing was studied. The results show the following: (1) Using the dense linear holes to control directional hydraulic fracturing can effectively form directional hydraulic fractures extending along the borehole line. (2) The hydraulic fracturing simulation program is very suitable for studying the basic law of directional hydraulic fracturing. (3) The reason why the hydraulic fracture can be controlled and oriented is that firstly, due to the mutual compression between the dense holes, the maximum effective tangential tensile stress appears on the connecting line of the drilling hole, where the hydraulic fracture is easy to be initiated. Secondly, due to the effect of pore water pressure, the disturbed stress zone appears at the tip of the hydraulic fracture, and the stress concentration zone overlaps with each other to form the stress guiding strip, which controls the propagation and formation of directional hydraulic fractures. (4) The angle between the drilling line and the direction of the maximum principal stress, the in situ stress, and the hole spacing has significant effects on the directional hydraulic fracturing effect. The smaller the angle, the difference of the in situ stress, and the hole spacing, the better the directional hydraulic fracturing effect. (5) The directional effect of synchronous hydraulic fracturing is better than that of sequential hydraulic fracturing. (6) According to the multihole linear codirectional hydraulic fracturing experiments, five typical directional hydraulic fracture propagation modes are summarized.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on Basic Law of Dense Linear Multihole Directional Hydraulic Fracturing

Zhang

2021

Geofluids

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“…By analogy with oil reservoir engineering, coal mining practices use the method of direct treatment of coal seams by hydraulic dissection via gas drainage boreholes drilled from underground roadways [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Effect of packer design on hydraulic fracturing of coal seam

Klishin

Клишин

2021

E3S Web Conf.

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The article addresses the issue of in-situ methane drainage from coal seams using multiple hydraulic fracturing. The authors undertake the stress–strain analysis of rock mass in the vicinity of a drainage borehole subjected to loading by sealing packers using the finite element method. The pressures at the packer and borehole wall contacts are calculated. It is shown how the length and spacing of the packers influence the values of the maximum axial tensile stresses on the borehole wall.

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“…In recent years, a large number of studies on the mechanism of directional hydraulic fracturing and the field application of a coal mine have been performed by scholars at home and abroad. Directional hydraulic fracturing can be achieved by three methods as described below: (1) Directional hydraulic fracturing guided by a guiding groove [13][14][15][16]: the wedge-shaped grooves are cut along the axial or radial direction of the borehole. The stress concentration makes the fracture propagate along the direction of the wedge-shaped grooves.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on the Basic Rules of Multihole Linear Codirectional Hydraulic Fracturing

Wang

Zhang

2020

Geofluids

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Directional rupture is one of the most important and common problems in rock breaking engineering. The purpose of directional rock breaking can be effectively realized by using multihole linear codirectional hydraulic fracturing. In this paper, realistic failure process analysis (RFPA) software is used to verify the experimental results of multihole linear codirectional hydraulic fracturing and investigate its basic law. The following results are demonstrated: (1) RFPA software can be very helpful to study the basic law of multihole linear codirectional hydraulic fracturing; (2) the process of multihole linear codirectional hydraulic fracturing can be divided into four stages: water injection boost, fracture initiation, stable fracture propagation, and fracture connection; and (3) multihole linear codirectional hydraulic fractures propagate along the direction of borehole distribution. Multihole codirectional hydraulic fracturing is influenced by the angle between the direction of the hole distribution and maximum principal stress, the difference of the principal stress, and the spacing of the boreholes. The smaller the angle, the difference value of the principal stress, and the hole spacing, the better the multihole codirectional hydraulic fracturing effect.

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3D finite element modeling of directional hydraulic fracturing based on deformation reinforcement theory

Cited by 15 publications

References 52 publications

Experimental and Numerical Investigation on Basic Law of Dense Linear Multihole Directional Hydraulic Fracturing

Experimental and Numerical Investigation on Basic Law of Dense Linear Multihole Directional Hydraulic Fracturing

Effect of packer design on hydraulic fracturing of coal seam

Numerical Simulation on the Basic Rules of Multihole Linear Codirectional Hydraulic Fracturing

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