Shear failure analysis of a shallow depth unsupported borehole drilled through poorly cemented granular rock

Hashemi, S.S.; Taheri, Abbas; Melkoumian, N.

doi:10.1016/j.enggeo.2014.10.003

Cited by 28 publications

(5 citation statements)

References 42 publications

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“…This is mainly due to the grain size distribution not being changed in the specimens tested. It should be mentioned that the application of different failure criteria, such as Drucker-Prager and Mogi-Coulomb [26], on poorly cemented sands have been investigated in another study [27]. Fig.…”

Section: Mohr-coulomb Strength Parametersmentioning

confidence: 99%

The failure behaviour of poorly cemented sands at a borehole wall using laboratory tests

Hashemi

Melkoumian

Taheri

et al. 2015

International Journal of Rock Mechanics and Mining Sciences

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Section: Mohr-coulomb Strength Parametersmentioning

confidence: 99%

The failure behaviour of poorly cemented sands at a borehole wall using laboratory tests

Hashemi

Melkoumian

Taheri

et al. 2015

International Journal of Rock Mechanics and Mining Sciences

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“…Al-Ajmi and Zimmerman [38] estimated the collapse pressure and fracture pressure of Dunham Dolomite and Solenhofen Limestone with Mohr-Coulomb criterion, Mogi-Coulomb criterion and Drucker-Prager failure criterion and carried out a comparative analysis between the calculation results and experimental data. Hashemi et al [39] also compared the calculation results of the three failure criteria with the results of a self-designed thick-walled hollow cylinder test. According to the above researches, the Mogi-Coulomb criterion proposed by Al-Ajmi and Zimmerman [40] was chosen for the failure of the intact rock matrix, as expressed by Equation 1:…”

Section: Failure Criteriamentioning

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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“…Under the condition of different sealing lengths, Guan-Hua et al [23] analysed various fracturing sealing parameters and, when combined with the Lagrange interpolation method, obtained optimised sealing parameters; Ge et al [24] optimised the ratio of sealing materials under the optimum compressive strength and shrinkage, determined the appropriate sealing length, and verified it by field tests. Hashemi et al [25] compared the aforementioned theoretical laboratory test data and studied the ability of hollow cylinder test data to predict the shear failure of a borehole; Erol and François [26] evaluated the performance of various grouting materials, through thermal, hydraulic, and mechanical laboratory characterisation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Strengthening and Sealing Materials and Their Application in Coal Mines

Zhang

Cheng

Liu

et al. 2020

Advances in Materials Science and Engineering

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To solve the problem of unstable sealing in the sealing section of a gassy, soft coal seam, a seal reinforcement material for gas extraction boreholes was developed, which was mainly made of ordinary Portland cement and blended with additives such as aluminium powder, quicklime, and gypsum. Firstly, in order to obtain the necessary expansion and compressive strength of reinforcement material, key factors affecting the material properties were determined. Key factors affecting the expansion properties and compressive strength of reinforcing materials were investigated by a single-factor test. Moreover, according to the central combination (Box–Behnken) experimental principle and response surface analysis (RSA), the interactions of various factors on the expansion and compressive strength were determined, and the optimal experimental conditions were acquired. The experimental results indicated that the optimum ratio of the material was 2% for gypsum and 0.52% for aluminium powder and quicklime at the experimental temperature of 20°C, and the ratio of water to material was 0.6. Finally, in the N1103 working face of No. 3 coal seam of Yuwu coal mine, Luan Group, China, the sealing property of the reinforcement material was validated, and the problem of hole collapse at the borehole orifice was solved (resulting in a gas concentration 2.48 times that measured before borehole reinforcement), and the gas drainage effect was enhanced.

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Shear failure analysis of a shallow depth unsupported borehole drilled through poorly cemented granular rock

Cited by 28 publications

References 42 publications

The failure behaviour of poorly cemented sands at a borehole wall using laboratory tests

The failure behaviour of poorly cemented sands at a borehole wall using laboratory tests

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

Experimental Study on Strengthening and Sealing Materials and Their Application in Coal Mines

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