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Mechanisms and Influence of Casing Shear Deformation near the Casing Shoe, Based on MFC Surveys during Multistage Fracturing in Shale Gas Wells in Canada

Figure 1. Geological stratification and well structure.

Mechanisms and Influence of Casing Shear Deformation near the Casing Shoe, Based on MFC Surveys during Multistage Fracturing in Shale Gas Wells in Canada For the purpose of increasing calculation accuracy, the elastoplastic constitutive relations of materials were considered, and the solid-shell elements technique was used. The reduction of the casing’s

Cyclic CH4 Injection for Enhanced Oil Recovery in the Eagle Ford Shale Reservoirs

Figure 1. The sketch of CH4 injection process in the fractured horizontal well (CH4 molecules diffuse into different nanopores).

The confined phase behavior was incorporated in the model considering the critical property shifts and capillary pressure. Subsequently, we built a field-scale simulation model of the Eagle Ford shale reservoir. The fluid properties under different pore sizes were evaluated. Finally, a series of studies were conducted to examine the contributions of

Global Impact of Unconventional Energy Resources

Global Impact of Unconventional Energy Resources

Global Impact of Unconventional Energy Resources Authors Manochehr Dorraj, Ken Morgan, Contributors Anas Alhajji, Stefan Andreasson, Larry Brogdon, Tina Hunter, Bijan Khajehpour, Tatiana Mitrova, Isidro Morales, Thomas B. Murphy, Silke Popp, Michael Slattery, David Yoxtheimer Abstract The chapters in this volume represent the latest thinking on the development and exploration of unconventional energy resources in the

Quantitative prediction of shale gas sweet spots based on seismic data in Lower Silurian Longmaxi Formation, Weiyuan area, Sichuan Basin, SW China

Fig. 1. Location of the study area.

Second, data volumes with high precision of the elastic parameters were obtained from pre-stack simultaneous inversion. The horizontal distribution of key parameters for shale gas evaluation were calculated based on the results of rock physics analysis. Then, the fuzzy evaluation equation was established by fuzzy optimization method with test and

The effect of interbedding on shale reservoir properties Kimmeridge Clay Formation

Figure 1. Structural elements of the North Sea showing the framework of the Viking Graben (modified from Dominguez, 2007) with inset of UK Quadrant 16 showing the location of wells studied (modified from DECC, 2013).

Abstract North Sea oil is overwhelmingly generated in shales of the Upper Jurassic – basal Cretaceous Kimmeridge Clay Formation. Once generated, the oil is expelled and ultimately migrates to accumulate in sandstone or carbonate reservoirs. The source rock shales, however, still contain the portion of the oil that was not expelled.

Groundwater baseline water quality in a shale gas exploration site and fracturing fluid-shale rock interaction

Fig. 2 The shallow groundwater chemical composition

At present, the baseline water quality must be firstly obtained to identify potential pollution of the activity and monitoring indicators should be studied for better environmental monitoring. We sampled shallow groundwater, produced waters, shale rock and soil in the Jiaoshiba shale-gas region, SW China and measurements have included water chemistry

Pore evolution in hydrocarbon-generation simulation of organic matter-rich muddy shale

Fig. 4. FESEM images of carbonaceous mudstone and the simulated samples at different temperatures.

However, in the high mature-overmature stage, shale porosity decreased with further increase of temperature and pressure. In contrast to micropores, micro-scale capillary pores and megapores in shale constantly decreased as rise of simulation temperature or pressure, indicating that deep-burial reservoirs was not favorable for free-gas storage; but significant increase of

Mechanism of multi-stage sand filling stimulation in horizontal shale gas well development

Fig. 1. Body-centered cubic and face-centered cubic models of equant spheres.

With consideration to the limitations in the implementation of the mechanical staging technique with bridge plug for shale gas development in the Sichuan–Chongqing area, the technique of multi-stage sand filling stimulation in horizontal wells was proposed to solve the above-mentioned problems. By filling sands in fractures, it is possible to

Strengthening shale wellbore with silica nanoparticles drilling fluid

Fig. 7. SEM images of shale surface (a) nanoparticles within shale and (b) aggregate of nanoparticles plugging a pore throat.

Higher concentration of nanoparticles can induce better plugging effect. However, for the OBDFs, nanoparticles did not show these positive effects like the nano WBDFs, even leaded to some negative effects such as higher filtration and larger Young's-modulus reduction. The main reasons are that the silica nanoparticles can easily disperse in