Nanopores to megafractures: Current challenges and methods for shale gas reservoir and hydraulic fracture characterization

Clarkson, Christopher R.; Haghshenas, Behjat; Ghanizadeh, Amin; Qanbari, Farhad; Williams-Kovacs, Jesse; Riazi, Naimeh; Debuhr, Chris; Deglint, Hanford J.

doi:10.1016/j.jngse.2016.01.041

Cited by 148 publications

(70 citation statements)

References 92 publications

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“…The actual volume and percentage of fluid recovered (Birdsell et al, 2015) depend on the percentage permanently sequestered in the rock matrix and on the extent of losses as an effect of leak-off in the formation, a very complex phenomenon happening on dual time scales (Wang et al, 2018). Backflow is also a way of determining properties of existing fractures 10.1029/2019WR026071 via inverse modeling (Clarkson et al, 2016), capturing their dominant features even using sparse monitoring networks (Dong et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Non‐Newtonian Backflow in an Elastic Fracture

Chiapponi

Ciriello

Longo

et al. 2019

Water Resources Research

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Backflow phenomenon, as a consequence of hydraulic fracturing, is of considerable technical and environmental interest. Here, backflow of a non-Newtonian fluid from a disk-shaped elastic fracture is studied theoretically and experimentally. The fracture is of constant aperture h and the outlet section at constant pressure p e . We consider a shear-thinning power-law fluid with flow behavior index n. Fracture walls are taken to react with a force proportional to h , with a positive elasticity exponent; for = 1 linear elasticity holds. Constant overload f 0 , acting on the fracture, is also embedded in the model. A transient closed-form solution is derived for the (i) fracture aperture, (ii) pressure field, and (iii) outflow rate. The particular case of a Newtonian fluid (n = 1) is explicitly provided. For p e = 0 and f 0 = 0, the residual aperture and outflow rate scale asymptotically with time t as t −n/(n+ +1) and t −(2n+ +1)/(n+ +1) , respectively, thus generalizing literature results for n = 1 and/or = 1. For nonzero exit pressure and/or overload, the fracture aperture tends asymptotically to a constant value depending on , n, p e , f 0 , and other geometrical and physical parameters. The results are provided in dimensionless and dimensional form, including the time to achieve a given percentage of fluid recovery. In addition, an example application (with values of parameters derived from field scale applications) is included to further characterize the influence of fluid rheology. Experimental tests are conducted with Newtonian and shear-thinning fluids and different combinations of parameters to validate the model. Experimental results match well the theoretical predictions, mostly with a slight overestimation.

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Section: Introductionmentioning

confidence: 99%

Non‐Newtonian Backflow in an Elastic Fracture

Chiapponi

Ciriello

Longo

et al. 2019

Water Resources Research

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“…Sustainability 2018, 10, 164 2 of 23 economic research of considering the potential application of SG [7,25,[33][34][35][36], the environmental impact assessment in SG exploitation [21,[37][38][39][40][41][42][43][44][45][46][47][48] and many others. Anyway, with the evolution from initial exploitation to the more and more complicated development of SG, the diverse research of SG can be found in available literature during past decades.…”

Section: Methodsmentioning

confidence: 99%

“…SG has complex characteristics such as large reserves, long production cycle, somewhat expensive exploration costs compared with other unconventional types of gas reservoirs and so on. The complexity of SG brings that the fields of SGR during the past years are diverse, which include theoretical SGR of analyzing the foundation of SG exploration [1,2,10,[24][25][26], model investigation in SG [24,[27][28][29][30][31][32][33], technical and economic research of considering the potential application of SG [7,25,[33][34][35][36], the environmental impact assessment in SG exploitation [21,[37][38][39][40][41][42][43][44][45][46][47][48] and many others. Anyway, with the evolution from initial exploitation to the more and more complicated development of SG, the diverse research of SG can be found in available literature during past decades.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of the Underlying Evolution of Shale Gas Research’s Domain Based on the Co-Word Network

Li¹,

Liu²,

Siqi³

et al. 2018

Sustainability

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Abstract:With the increasing shortage energy, the exploration and utilization of shale gas (SG) have greatly changed the world's natural gas supply pattern. In this study, based on a bibliometric review of the publications related to SG, by analyzing the co-word networks during the past years, we provide comprehensive analyses on the underlying domain evolution of shale gas research (SGR). Firstly, we visualize the topical development of SGR. We not only identify the key topics at each stage but also reveal their underlying dependence and evolutionary trends. The directions of SGR in the future are implied. Secondly, we find the co-word network has small-world and scale-free characteristics, which are the important mechanisms of driving the evolution of SGR's domain. Thirdly, we analyze China's SGR. We find the co-word network in China's SGR has not yet emerged obvious differentiation. Nevertheless, it has a similar self-organized evolution process with the co-word network of international SGR. Our above results can provide references for the future SGR of scholars, optimization or control of the domain and the strategy/policy of countries or globalization.

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“…A HFU corresponds to a distribution around its mean value, which is difficult to classify by several parallel lines. Cluster analysis techniques based on ANN were introduced to classify the point group of FZI according to the similarity (Clarkson et al, 2016). Recently, a committee fuzzy inference system based on genetic algorithmpattern search technique and clustering technique using multiresolution graph were developed for improving the accuracy of flow units prediction (Ougier-Simonin et al, 2016;Sander et al, 2017).…”

Section: Pore Type and Hfusmentioning

confidence: 99%

Applications of digital core analysis and hydraulic flow units in petrophysical characterization

Chen

Zhou

2017

Adv. Geo-Energ. Res.

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Conventional petrophysical characterizations are often based on direct laboratory measurements. Although they provide accurate results, such measurements are time-consuming and limited by instrument and environment. What's more, in the georesource energy industry, availability and cuttings of core plugs are difficult. Because of these reasons, virtual digital core technology is of increasing interest due to its capability of characterizing rock samples without physical cores and experiments. Virtual digital core technology, also known as digital rock physics, is used to discover, understand and model relationships between material, fluid composition, rock microstructure and macro equivalent physical properties. Based on actual geological conditions, modern mathematical methods and imaging technology, the digital model of the core or porous media is created to carry out physical field numerical simulation. In this review, the methods for constructing digital porous media are introduced first, then the characterization of thin rock cross section and the capillary pressure curve using scanning electron microscope image under mixed wetting are presented. Finally, we summarize the hydraulic flow unit methods in petrophysical classification.Keywords: Digital core, porous media, petrophysical characterization, thin section, mercury injection capillary pressure.Citation: Chen, X., Zhou, Y. Applications of digital core analysis and hydraulic flow units in petrophysical characterization. Adv.

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Nanopores to megafractures: Current challenges and methods for shale gas reservoir and hydraulic fracture characterization

Cited by 148 publications

References 92 publications

Non‐Newtonian Backflow in an Elastic Fracture

Non‐Newtonian Backflow in an Elastic Fracture

An Investigation of the Underlying Evolution of Shale Gas Research’s Domain Based on the Co-Word Network

Applications of digital core analysis and hydraulic flow units in petrophysical characterization

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