Laboratory visualization of fracture initiation and propagation using compressible and incompressible fracturing fluids

AlTammar, Murtadha J.; Gala, Deepen; Sharma, Mukul M.; McAndrew, James

doi:10.1016/j.jngse.2018.05.010

Cited by 27 publications

(8 citation statements)

References 13 publications

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“…With an increase in the injection rate, the increasing rate of net pressure will increase as well as the stress caused by loss and the injection pressure, leading to an increase in the breakdown pressure. Morgan et al (2017) and AlTammar et al (2018) have confirmed this conclusion through experiments. At the same time, the simulation results obtained by Jung et al (2014) through PFC 2D are also consistent with the conclusion.…”

Section: Effects Of Injection Ratesupporting

confidence: 54%

Experimental investigation of propagation mechanisms and fracture morphology for coalbed methane reservoirs

Zhang

et al. 2018

Pet. Sci.

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Fracture propagation mechanisms in coalbed methane (CBM) reservoirs are very complex due to the development of the internal cleat system. In this paper, the characteristics of initiation and propagation of hydraulic fractures in coal specimens at different angles between the face cleat and the maximum horizontal principal stress were investigated with hydraulic fracturing tests. The results indicate that the interactions between the hydraulic fractures and the cleat system have a major effect on fracture networks. ''Step-like'' fractures were formed in most experiments due to the existence of discontinuous butt cleats. The hydraulic fractures were more likely to divert or propagate along the butt cleat with an increase in the angles and a decrease in the horizontal principal stress difference. An increase in the injection rate and a decrease in the fracturing fluid viscosity were more conducive to fracture networks. In addition, the influence on fracture propagation of the residual coal fines in the wellbore was also studied. The existence of coal fines was an obstacle in fracturing, and no effective connection can be formed between fractures. The experimental investigation revealed the fracture propagation mechanisms and can provide guidance for hydraulic fracturing design of CBM reservoirs.

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Section: Effects Of Injection Ratesupporting

confidence: 54%

Experimental investigation of propagation mechanisms and fracture morphology for coalbed methane reservoirs

Zhang

et al. 2018

Pet. Sci.

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“…Recently, a more advanced test setup was developed, being capable of applying simultaneously a vertical load and a hydraulic pressure in preexisting fractures Advances in Civil Engineering [53][54][55]. Moreover, various accessories such as transducers [56], high-resolution optical images [10], and acoustic emission (AE) sensors [57] can be added to the uniaxial type of experimental setup to facilitate mapping of hydraulic fractures.…”

Section: Uniaxial Typementioning

confidence: 99%

“…e initiation and propagation of hydraulic fractures can be monitored using the uniaxial type setup (Figure 2(b)) described in AlTammar et al [10], as this setup is equipped with a 4K resolution digital video camera. Being equipped with a specially designed water pressure device, the uniaxial type setup described in Gonçalves da Silva et al [53] allows the application of hydraulic pressure to both natural and artificial fractures.…”

Section: Uniaxial Typementioning

confidence: 99%

“…Literature review indicates that a variety of fracturing fluids have been used in experiments. ey include oil [76], water [77], guar gum [72], liquid carbon dioxide (L-CO 2 ) [78], supercritical carbon dioxide (SC-CO 2 ) [79], linear gel [80], polymer fluid [68], calcium chloride (CaCl 2 ) solution [81], methyl methacrylate (MMA) [57], nitrogen [10], and bentonite slurry [82]. Moreover, in an experiment, the fracturing fluid is often mixed with a fluorescent compound (Figure 1(c)) for better tracing of hydraulic fractures [83].…”

Section: Fracturing Fluids Fracturing Fluids Play Crucial Roles In Amentioning

confidence: 99%

“…Uniaxial type setups for hydraulic fracturing experiments in (a) Daneshy[51]; (b) AlTammar et al[10]; (c) Gonçalves da Silva et al[53]; (d) Moreno et al[56]; (e) Anderson[52]; and (f ) Li et al[55].…”

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confidence: 99%

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Advances in Laboratory‐Scale Hydraulic Fracturing Experiments

Qian

Guo

Wang

et al. 2020

Advances in Civil Engineering

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Hydraulic fracturing has been widely applied to stimulate the natural gas and oil production from unconventional reservoirs. To optimize the design of hydraulic fracturing in this application, an accurate estimation of the initiation and propagation of hydraulic fractures is indispensable. However, it still remains challenging as a result of the complex stress state and geological conditions. On account of their ability to complete control some significant factors and efficient observation of fracture geometry, laboratory-scale hydraulic fracturing experiments have received abundant research attention in recent years. This paper presents a review of the state of the art of laboratory-scale hydraulic fracturing experiments, focusing on the scaling analysis, experimental setup, fracturing fluids, and sample preparation. A discussion of the directions for future research is also provided with the intention of stimulating the development of the experimental technique for investigating hydraulic fracturing.

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Characterization of hydraulic crack initiation of coal seams under the coupling effects of geostress difference and complexity of pre-existing natural fractures

Liu

Feng

et al. 2021

Geomech. Geophys. Geo-energ. Geo-resour.

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Laboratory visualization of fracture initiation and propagation using compressible and incompressible fracturing fluids

Cited by 27 publications

References 13 publications

Experimental investigation of propagation mechanisms and fracture morphology for coalbed methane reservoirs

Experimental investigation of propagation mechanisms and fracture morphology for coalbed methane reservoirs

Advances in Laboratory‐Scale Hydraulic Fracturing Experiments

Characterization of hydraulic crack initiation of coal seams under the coupling effects of geostress difference and complexity of pre-existing natural fractures

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