Hydraulic and Sleeve Fracturing Laboratory Experiments on 6 Rock Types

Brenne, S.; Molenda, Michael; Stöckhert, Ferdinand; Alber, Michael

doi:10.5772/56301

Cited by 14 publications

(34 citation statements)

References 11 publications

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“…Guo et al (1993) noted that the BTS predicts too low a breakdown pressure. Experimental results by Brenne et al (2013) also show the inconsistency between the two for six types of rocks; particularly, the BTS of sandstone underestimated the breakdown pressures regardless of borehole size.…”

Section: Comparison Of Breakdown Pressuresmentioning

confidence: 97%

“…The classical breakdown prediction models mainly considering in situ stresses, tensile strength and pore pressure effect are not able to predict the anomalously high P b . This phenomenon was also pointed out by Brenne et al (2013), and they used the fracture mechanics model to explain the quite high breakdown pressures in sleeve fracturing test by assuming presence of cracks with relatively large length.…”

Section: Comparison Of Breakdown Pressuresmentioning

confidence: 99%

“…Injection rate was constant in each test, and seven different injection rates were used (q = 1, 5, 10, 25, 50, 75, and 100 mm 3 /s). The highest injection rates were chosen referring to past studies using similarly sized specimens (Solberg et al 1980;Brenne et al 2013). Sleeve fracturing tests were performed on H specimens for comparison with hydraulic fracturing tests.…”

Section: Test Conditionsmentioning

confidence: 99%

“…Clearly, the loading rate-dependent phenomena are related to the infiltration of injecting fluids in different rocks. A few studies performed sleeve fracturing tests to exclude hydraulic effects (Ishida et al 1997;Brenne et al 2013;Stoeckhert et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Water Infiltration, Injection Rate and Anisotropy on Hydraulic Fracturing Behavior of Granite

et al. 2018

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Hydraulic fracturing tests on Pocheon granite cylinders at seven different injection rates varying from 1 to 100 mm 3 /s were conducted. They were compared with sleeve fracturing tests in which borehole was sleeved, and therefore, water infiltration influence was excluded. Hydraulic fracturing behavior of granite is significantly influenced by water infiltration, which is closely related to the preexisting microcracks in granite as well as the cleavage anisotropy. There was a threshold injection rate to fracture the granite specimen under given stress conditions. When the injection rate is below the threshold, water infiltrated granite matrix with slow increment of injection pressure, and the specimen finally reached a full saturation without fracturing. Injection pressure developed nonlinearly with time during water infiltration, while approximately linearly when infiltration was excluded. For both hydraulic and sleeve fracturing tests, breakdown pressure increases with increasing injection rate. The breakdown pressures by sleeve fracturing were more than two times higher than those in hydraulic fracturing. X-ray computed tomography (CT) observations show that induced fractures are along the weaker cleavage parallel to the direction of the vertical stress. The higher breakdown pressure results in a larger aperture of fractures in hydraulic fracturing tests.

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Section: Comparison Of Breakdown Pressuresmentioning

confidence: 97%

Section: Comparison Of Breakdown Pressuresmentioning

confidence: 99%

Section: Test Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Water Infiltration, Injection Rate and Anisotropy on Hydraulic Fracturing Behavior of Granite

et al. 2018

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“…Stanchits [18] observed that the propagation of the cloud of acoustic emission induced by hydraulic fracture was faster in the direction parallel to bedding than perpendicular to it. According to a study by Brenne and Molenda [19], the breakdown pressures of six rock types were extremely different under the same experimental conditions. Li et al [20] conducted hydraulic fracturing experiments in shale cores with different stress statuses using different stimulating fluids, such as H 2 O, CO 2 , and N 2.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Crack Extension Patterns in Hydraulic Fracturing with Shale, Sandstone and Granite Cores

Lin

et al. 2016

Energies

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Abstract:Hydraulic fracturing is an important method of reservoir stimulation in the exploitation of geothermal resources, and conventional and unconventional oil and gas resources. In this article, hydraulic fracturing experiments with shale, sandstone cores (from southern Sichuan Basin), and granite cores (from Inner Mongolia) were conducted to investigate the different hydraulic fracture extension patterns in these three reservoir rocks. The different reactions between reservoir lithology and pump pressure can be reflected by the pump pressure monitoring curves of hydraulic fracture experiments. An X-ray computer tomography (CT) scanner was employed to obtain the spatial distribution of hydraulic fractures in fractured shale, sandstone, and granite cores. From the microscopic and macroscopic observation of hydraulic fractures, different extension patterns of the hydraulic fracture can be analyzed. In fractured sandstone, symmetrical hydraulic fracture morphology could be formed, while some micro cracks were also induced near the injection hole. Although the macroscopic cracks in fractured granite cores are barely observed by naked eye, the results of X-ray CT scanning obviously show the morphology of hydraulic fractures. It is indicated that the typical bedding planes well developed in shale formation play an important role in the propagation of hydraulic fractures in shale cores. The results also demonstrated that heterogeneity influenced the pathway of the hydraulic fracture in granite cores.

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Laboratory Investigations on the Hydraulic Fracturing of Granite Cores

Zhuang

Jung

Diaz

et al. 2020

Modelling Rock Fracturing Processes

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This chapter introduces laboratory studies on the hydraulic fracturing of granite cores. Some of the most important factors influencing fracturing are considered, including injection rate, fluid infiltration, fluid viscosity, borehole size, and injection scheme. Results from acoustic emission monitoring help elucidate the fracturing process. Hydraulic fractures of granite samples are observed and analysed at the mineral scale with the aid of X-ray scanning and Computed Tomography. A first attempt to investigate the initiation and propagation of hydraulic fractures in granite drill cores during cyclic injection is presented.

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Hydraulic and Sleeve Fracturing Laboratory Experiments on 6 Rock Types

Cited by 14 publications

References 11 publications

Effect of Water Infiltration, Injection Rate and Anisotropy on Hydraulic Fracturing Behavior of Granite

Effect of Water Infiltration, Injection Rate and Anisotropy on Hydraulic Fracturing Behavior of Granite

Experimental Investigation of Crack Extension Patterns in Hydraulic Fracturing with Shale, Sandstone and Granite Cores

Laboratory Investigations on the Hydraulic Fracturing of Granite Cores

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