Analytical investigation of well/perforation scale effect on sand production of weakly consolidated sandstones

Tehrani, Soroush; Sarmadivaleh, Mohammad; Sinaki, Ahmadreza Younessi; Mostofi, Masood; Bayati, Morteza

doi:10.1071/aj15029

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…12 Tehrani carried out a sandstone thin-wall cylinder compression experiment and verified that drilling size has a great influence on borehole stability. 13 Joung used the classical elastic–plastic theory to predict the strength of a certain size borehole. 14 However, classical elastoplastic mechanics lacks a description of the borehole size.…”

Section: Introductionmentioning

confidence: 99%

“…The classical elastic–plastic theory and fracture mechanics are the basic methods for studying borehole instability failure . Tehrani carried out a sandstone thin-wall cylinder compression experiment and verified that drilling size has a great influence on borehole stability . Joung used the classical elastic–plastic theory to predict the strength of a certain size borehole .…”

Section: Introductionmentioning

confidence: 99%

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Study on the Effect of Borehole Size on Gas Extraction Borehole Strength and Failure Mode

Gao

Ren

2022

ACS Omega

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In the coal mine industry, the instability failure of an extraction borehole is one of the main factors leading to the decrease in gas extraction rate. The study on borehole strength and failure mode with different sizes can provide a theoretical basis for the optimization and selection of a gas extraction borehole. In this paper, biaxial loading tests are carried out on similar coal specimens, and the prediction model of borehole strength is proposed and verified. At the same time, numerical simulation of similar specimens is carried out to analyze the failure process of boreholes of different sizes. The results show that hole size has a great influence on hole strength, and the hole strength decreases with an increase of hole size. Size change has a great influence on the strength of a small-size borehole, and the strength of the borehole gradually stabilizes with an increase of size. The process of borehole failure can be divided into three stages, borehole top failure, borehole deformation, and crack extension. Stress concentration and a large number of cracks occur on the two wings of the borehole, and these cracks reduce the strength of the borehole. The stress concentration area of the borehole is X-shaped distribution, and the through crack mainly extends along this area and leads to the failure of the specimen.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Borehole Size on Gas Extraction Borehole Strength and Failure Mode

Gao

Ren

2022

ACS Omega

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Numerical simulation of sanding using a coupled hydro-mechanical sand erosion model

Fetrati

Pak

2020

Journal of Rock Mechanics and Geotechnical Engineering

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The Effect of Inner Borehole and Outer Boundary Dimensions in Thick-Walled Cylinder Test

Tehrani

Sinaki

Sarmadivaleh

et al. 2016

SPE Eastern Regional Meeting

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It is well-known that the risk of sanding varies for different completion systems, i.e. open hole versus cased and perforation, in a given wellbore and reservoir. Part of this difference comes from the scale effect of the borehole. Pragmatic approaches are usually taken to consider the borehole scale effect in the sand production prediction analysis. A more rigorous approach is needed to take this effect into account. Experiments have been conducted by researchers on Thick-Walled Cylinder (TWC) samples with different inner to outer diameter ratios (ID/OD) for samples with standard dimensions (1.5in ID, and 3in length) to investigate the borehole scale effect on the failure of the inner borehole. However, the results partially suffer from the outer boundary effect of the tests and may not purely represent the inner borehole scale effect. Here in this paper, the outer boundary effects of TWC experiments were distinguished from the inner borehole scale effect using analytical approaches followed by extensive laboratory experiments. For this purpose results from comparing different failure criteria (i.e. Mohr-Coulomb, Drucker-Prager, Mogi and modified Lade) from Tehrani's results (2016) were used. Then, the volumetric strain was formulated against confining pressure to explain the elastic, elastic-plastic, and plastic behaviour of the rock. Variation of TWC strength of samples with different inner borehole sizes may not be fully captured by the analytical approach which only considers the effect of the ID/OD. Hence, the differences between the analytical and experimental approaches can be considered as the inner borehole scale effect. As expected, the analysis showed that the size of the inner borehole and the outer boundaries significantly change the TWC strength of the rock. After distinguishing the outer boundary effects, the results shows a decreasing trend between the inner borehole size and the TWC strength of the sample, which can be considered as the borehole scale effect. This study has also broadened the understanding of the effect of borehole and boundaries dimensions in TWC test, which may be generalized to real scale cases, i.e. wellbores and perforations.

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Analytical investigation of well/perforation scale effect on sand production of weakly consolidated sandstones

Cited by 3 publications

References 4 publications

Study on the Effect of Borehole Size on Gas Extraction Borehole Strength and Failure Mode

Study on the Effect of Borehole Size on Gas Extraction Borehole Strength and Failure Mode

Numerical simulation of sanding using a coupled hydro-mechanical sand erosion model

The Effect of Inner Borehole and Outer Boundary Dimensions in Thick-Walled Cylinder Test

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