Experimental study of directional propagation of hydraulic fracture guided by multi-radial slim holes

Guo, Tiankui; Rui, Zhenhua; Qu, Zhanqing; Qi, Ning

doi:10.1016/j.petrol.2018.03.102

Cited by 39 publications

(16 citation statements)

References 34 publications

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“…The fracture is analyzed in the model (formation diameter 150 m) with a phase angle of 90°and horizontal stress difference of 6 MPa. According to the simulation result (Figure 10), the principal fracture in the distant area propagates individually along the corresponding radial borehole, with the same propagation rule as that in the single-radial borehole fracturing [28]. Because of the difference of the fracture initiation pressure in the dual-radial borehole fracturing, the fracture is firstly initiated in the radial borehole near the maximum principal stress, where the fracture propagation distance is further.…”

Section: Fracture Morphology Of Multiradial Boreholementioning

confidence: 86%

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Research and Application of Radial Borehole Fracturing Based on Numerical Simulation

2019

Geofluids

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The radial borehole fracturing technology has been applied in a certain number of oilfields with good results being achieved. However, the morphology and variation of fracture still require further study. In this paper, the reservoir model based on formation fluid-solid coupling equation is established with the extended finite element method (XFEM) in ABAQUS, and the fracture morphologies in the single-radial borehole, vertical multiradial borehole, and horizontal multiradial borehole are simulated and analyzed with criteria of maximum principal stress and maximum energy release rate as the damage mechanism. Moreover, the accuracy of numerical simulation results is verified with the large-scale true 3D physical simulation experiment. The results show that the induced stress field along the radial borehole during fracturing is the root cause of fracture directional propagation along the radial borehole whose effective guidance distance reaches 40 m. The vertical multiradial borehole can effectively enhance fracture directional propagation and is capable of reducing fracture initiation pressure. In the horizontal multiradial borehole, the major fracture propagating along each radial borehole is formed in the remote-borehole area, and the secondary fracture connecting the neighboring radial boreholes is formed in the near-borehole zone. Coordination of major and secondary fractures can effectively increase the drainage area and reduce the flow resistance in the near-borehole zone. Based on the research on fracture morphology of multiradial borehole fracturing, the scheme of radial borehole arrangement is optimized and verified through numerical simulation of deliverability. The final optimum borehole arrangement scheme is the intersectional angle of 45°between four orthogonal radial boreholes and horizontal maximum principal stress.

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Section: Fracture Morphology Of Multiradial Boreholementioning

confidence: 86%

“…The model data of fracture propagation used to support the findings of this study are included within the supplementary information file (.inp). The data of CMG is from the papers in the reference list [28,29] which is cited.…”

Section: Data Availabilitymentioning

confidence: 99%

Research and Application of Radial Borehole Fracturing Based on Numerical Simulation

2019

Geofluids

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“…In order to improve the effectiveness of test results, it is essential to set test conditions as close as possible to field conditions to obtain experimental results approved by field engineers. And many scholars have adopted field parameters as experimental conditions in the hydraulic fracture experiments with triaxial pressure vessels . So the test focuses on the conditions in the design process, such as experimental material, test time, test load, geometric size, kinematic condition, and so on.…”

Section: Methodsmentioning

confidence: 99%

Large‐scale experiments of the borehole instability on shale formation influenced by drill pipe rotation

Sun

Meng

Dai

et al. 2019

Energy Science & Engineering

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Wellbore instability happens mostly in the shale formation. Early researches have studied thoroughly on the physicochemical and mechanical mechanism that causes instability. However, only a few works have considered the influence of field drilling operations, such as drill pipe rotation. In this paper, a true triaxial cell is used to simulate the downhole field situations, and a drill pipe rotation device is innovatively designed and implemented into the true triaxial cell. Using this facility, the influence of drill pipe rotation on shale instability has been performed. Different rotation speed, weight on bit, drilling fluid pressure, and microcracks on borehole have been considered. The enlargement of the wellbore is quantitatively plotted and compared.Results show that the drill pipe rotation contributes to a more enlargement of the wellbore, and a higher rotation speed causes a more severe collapse. The drill string weight on bit also contributes to the enlargement of the wellbore, with a larger weight on bit induces a larger diameter of the collapsed wellbore. Compared with the rotation speed and weight on bit, the influence of drilling fluid density is relatively less significant. However, the influence of microcracks caused by hitting of drilling tools is profound. For a cracked shale formation, the wellbore diameter can be enlarged for more than 40%. Then, the variation of borehole collapse with time and depth under drill pipe rotation influence is analyzed. In all of these four factors, the significant sequence is microcracks > weight on bit > rotation speed > drilling fluid pressure.In all the collapse phenomena, the collapse is more severe in the minimum horizontal stress direction. This is explained by the analysis of the stress distribution in the whole circumferential angle (360°) of the wellbore. Overall, this work fills the gap of the influence of drilling operations on wellbore instability. K E Y W O R D Sborehole enlargement, drill pipe rotation, true triaxial cell, wellbore instability 2896 | SUN et al.

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“…Under pressure relief of the guide holes, hydraulic fractures will directionally propagate along the line of the fracturing boreholes. The more guide holes, the better the effect of directional propagation and the larger the directional propagation range of hydraulic fracturing [23,24,29,30]. Recently, multihole linear directional hydraulic fracturing is proposed by Zhao et al This technology first arranges multiple fracturing holes in a straight line.…”

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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Experimental study of directional propagation of hydraulic fracture guided by multi-radial slim holes

Cited by 39 publications

References 34 publications

Research and Application of Radial Borehole Fracturing Based on Numerical Simulation

Research and Application of Radial Borehole Fracturing Based on Numerical Simulation

Large‐scale experiments of the borehole instability on shale formation influenced by drill pipe rotation

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

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