Date of download: 10/11/2017 Copyright © ASME. All rights reserved. From: Design of a Magnetic Resonance Imaging Compatible Metallic Pressure Vessel J. Pressure Vessel Technol. 2013;135(4):045001-045001-7. doi:10.1115/1.4023728 Figure Legend: MRI-compatible pressure vessels. (a) Cross-sectional longitudinal view of cylindrical MRI compatible metallic pressure vessel. The RF probe is contained inside the vessel. (b) MRI compatible nonmetallic pressure vessel. The RF probe is outside of the vessel.

Date of download: 10/11/2017 Copyright © ASME. All rights reserved. From: Design of a Magnetic Resonance Imaging Compatible Metallic Pressure Vessel J. Pressure Vessel Technol. 2013;135(4):045001-045001-7. doi:10.1115/1.4023728 Figure Legend: MRI-compatible metallic core holder. (a) Cross-sectional diagram of a metallic core holder embodying the principles of Fig. 1(a) for the study of rock core samples. (b) Photo of RF probe construction. The RF probe is a 16-rung birdcage coil. This assembly is sealed with epoxy and placed in another annular cylinder. (c) Photo of MRI-compatible core holder fabricated from Nitronic 60 stainless steel. The core plug sample, bottom, is held by heat shrink tubing and an Aflas sleeve to make a connection to the inlet and outlet flow pipe, second from bottom. The encapsulated sample is positioned inside the RF probe. The entire assembly goes into the vessel, top. The vessel is sealed at the ends by o-rings.

Date of download: 10/11/2017 Copyright © ASME. All rights reserved. From: Design of a Magnetic Resonance Imaging Compatible Metallic Pressure Vessel J. Pressure Vessel Technol. 2013;135(4):045001-045001-7. doi:10.1115/1.4023728 Figure Legend: Exploring the background signal problem. (a) 1D transverse profiles of a core flooding experiment where water floods the rock from the left to right in the image. It can be seen that the background signal is of the same order of magnitude as the sample. (b) 2D transverse image of a saturated rock sample in the first version core holder, with severe background signal. (c) 2D transverse image of a saturated rock sample in the new version core holder with more suitable material selections to minimize background signal. The ratio of signal from a water saturated rock sample to background signal was measured and increased from a ratio of approximately 1:1 to 35:1 in the old versus new version.

Date of download: 10/11/2017 Copyright © ASME. All rights reserved. From: Design of a Magnetic Resonance Imaging Compatible Metallic Pressure Vessel J. Pressure Vessel Technol. 2013;135(4):045001-045001-7. doi:10.1115/1.4023728 Figure Legend: Sealing mechanisms for pressure vessels. (a) Pressure vessel sealing schematic. A large diameter bolt circle holds a cap using a face-sealing o-ring. An effective solution but not space efficient. (b) Piston style sealing used for the metallic core holder. This design requires less diametrical clearance for the same size sample relative to the design of (a).

Date of download: 10/11/2017 Copyright © ASME. All rights reserved. From: Design of a Magnetic Resonance Imaging Compatible Metallic Pressure Vessel J. Pressure Vessel Technol. 2013;135(4):045001-045001-7. doi:10.1115/1.4023728 Figure Legend: MRI images of water flooding a Berea sandstone core sample in the steel core holder under moderate pressure and temperature. Water migrated through the dry rock from right to left. 2D longitudinal images were acquired at intervals of 43 s. The rock, 25 mm in diameter and 75 mm in length, saturated in 40 min. (a) Nine of the 2D images, at intervals of 3.6 min acquired during water penetration. (b) 1D profiles extracted from the centerline of the 2D images at intervals of 3.6 min. Note the progression of the wetting front through the porous sample and also the increased image intensity as a function of time behind the wetting front.