Core Sample Preparation

McPhee, Colin; Reed, Jules; Zubizarreta, Izaskun

doi:10.1016/b978-0-444-63533-4.00004-4

Cited by 20 publications

(35 citation statements)

References 9 publications

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“…After segmentation, the connected pores were transformed into cylindrical pore throats and spherical pore bodies using the skeletonization tool, resulting in a series of nodal points, segments, and nodes that served as input to calculate porosity and permeability of the sample using PoreFlow software (Raoof et al 2013). Considering routine core analysis as a calibration technique (McPhee et al 2015), PoreFlow results showed a good agreement with the measurements (provides shown in Table 4). While the porosities obtained with PoreFlow were smaller, the calculated and measured permeabilities were similar for most samples.…”

Section: Resultsmentioning

confidence: 80%

“…Routine core analysis is a non-destructive technique used to determine the porosity and permeability as based on Boyle's law and Darcy's law, respectively. Results obtained with a combined gas permeameter-porosimeter (AP-608, from Coretest Systems Inc., Reno, NV) provided a reference for all other petrophysical measurements (McPhee et al 2015). For the NMR measurements, we saturated the samples in a saline solution consisting of 30,000 ppm KCl brine with a density of 1.0167 g/cm 3 and subjected to a hydrostatic pressure of 138 bar for 24 h (Fig.…”

Section: Methodsmentioning

confidence: 99%

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Petrophysical Correlations for the Permeability of Coquinas (Carbonate Rocks)

et al. 2020

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The pore structure of many carbonate formations is known to be very complex and heterogeneous. Heterogeneity is manifested by the presence of different types, sizes, and shapes of pores resulting from sedimentation and diagenetic actions. These complexities greatly increase uncertainties in estimated rock hydraulic properties in that different permeability values may occur for samples having similar porosities. In order to understand the effects of pore structure and heterogeneity, petrophysical analyses were performed on coquina samples from the Morro do Chaves Formation (Barremian, Sergipe-Alagoas Basin), which is an analogue of Brazilian Pre-salt oil reservoirs of Itapema Formation in the Santos Basin. Routine core analyses, and NMR and MICP measurements were carried out to obtain pore body and pore throat distributions. Obtained T2 relaxation times were converted to pore size radii by matching the NMR and MICP curves. Pore-scale imaging and pore network modelling were performed using microCT scans and the PoreFlow software, respectively. Calculated permeabilities using PoreFlow showed excellent agreement with the routine laboratory measurements. Samples having pore bodies with a higher coordination number showed much larger permeabilities at similar porosities. This study includes a statistical analysis of various features that caused the observed differences in permeability of the coquinas, including the role of connectivity of the entire porous system. Limitations and challenges of the various techniques, and the imaging and pore-scale flow simulations, are discussed.

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Section: Resultsmentioning

confidence: 80%

Section: Methodsmentioning

confidence: 99%

Petrophysical Correlations for the Permeability of Coquinas (Carbonate Rocks)

et al. 2020

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“…Meanwhile, clay minerals (e.g., kaolinite and illite) detached from the shale surface tend to block parts of pore throat restrictions. 54 Accordingly, the rate of decrease in the contact angle was lowered in the second stage to some extent.…”

Section: Results and Discussionmentioning

confidence: 97%

“…With increasing time, the infiltration of water droplets becomes the main reason why the contact angles are observed to still decrease, although the water droplets stop spreading over the shale surface. Meanwhile, clay minerals (e.g., kaolinite and illite) detached from the shale surface tend to block parts of pore throat restrictions . Accordingly, the rate of decrease in the contact angle was lowered in the second stage to some extent.…”

Section: Results and Discussionmentioning

confidence: 99%

Experimental Study of the Wettability Characteristic of Thermally Treated Shale

Yang

Gu²,

Chen

et al. 2020

ACS Omega

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Extraction of shale gas from shale reservoirs is significantly affected by shale wettability. Recently, thermal recovery technologies (e.g., combustion) have been tested for shale gas recovery. This requires an understanding of the wettability change mechanism for thermally treated shale samples. In this study, the effect of combustion on shale wettability was investigated. Shale samples were first processed to obtain smooth surfaces and then combusted at temperatures of 200, 400, and 800 °C. The initial contact angles and dynamic behavior of water droplets on shale surfaces were recorded using the sessile drop method. It was found that pores and fractures were generated on the shale surfaces following high-temperature combustion. The pore volume and diameter increased with increasing combustion temperature, which improved the connectivity of hydrophilic pore networks. Compared to a raw shale sample, the shale sample combusted at 400 °C showed a smaller initial water contact angle and a more rapid decrease in the contact angle because of the oxidation of organic matter and generation of pore structures. Water droplets were found to completely spread over the surface of the shale sample combusted at 800 °C because of the generation of fractures. Moreover, the van der Waals potential between water droplets and combusted shale samples was determined to be stronger. However, the initial contact angle and dynamic behavior of water droplets did not show a significant change for the shale sample combusted at 200 °C. As a result, high-temperature combustion (≥400 °C) can be used to significantly improve the hydrophilicity of shale.

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“…Smectite clays such as natural-Veegum (VF) and synthetic-laponite (LP) are also widely used in the pharmaceuticals as stabilising and suspending agent, rheology modifier as well as texture enhancer (15,16). Primarily, these high swelling clays contain Na + ions in between their interlayer spacing, enabling them to adsorb up to 32 layers of water molecules (17). Adebisi et al found that VF increases the dissolution rate of theophylline from the tablet matrices (15).…”

Section: Introductionmentioning

confidence: 99%