Directional borehole radar tests of an oil injection experiment at the Colorado School of Mines, Golden, Colorado

Abraham, Jared D.; Moulton, Craig W.; Brown, Philip J.

doi:10.3133/ofr0263

Cited by 4 publications

(13 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Langmuir constant, C i,j , of guest molecule J in cage i quantifies how attractive each cavity is for a given guest molecule, with larger values indicating preferential enclathration of that guest. 1 The Langmuir constants are evaluated from: 11 where k B is the Boltzmann constant; R i is the average radius of cavity type i; a c,i,J is the hard-core radius of guest J for cavity-type i; and i,J is the cell potential for a cavity of type i and guest molecule J. Assuming a perfectly spherical cavity, the potential energy function of the guest molecule i inside the cage type i can be expressed as: 21 …”

Section: Methodsmentioning

confidence: 99%

“…The former is calculated using: 16–18 where h β w,0 ( T 0 , p 0 ) is the enthalpy at reference state p 0 , T 0 , and c β p,w is the heat capacity of the empty lattice which only consists of H 2 O molecules. Ballard and Sloan 1,6–11 considered g β w,0 and h β w,0 as linear functions of the lattice parameter for different hydrate crystal structures, at reference conditions. However, this linear dependence was found to be unnecessary and potentially the cause of unrealistic physical behaviour.…”

Section: Methodsmentioning

confidence: 99%

“…A drawback of this approach is a continuous aqueous phase will not always be present in hydrate-forming systems, including when all of the available free water is consumed. A significant development in the description of empty hydrate properties was thus made by the model of Ballard and Sloan 1,6–11 who provided for the first time a direct description of the empty hydrate lattice without reference to an aqueous phase that also worked well for mixed hydrates.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A cage-specific hydrate equilibrium model for robust predictions of industrially-relevant mixtures

Zhu

Norris

Aman

et al. 2023

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A cage-specific hydrate equilibrium model for robust predictions of industrially-relevant mixtures

Zhu

Norris

Aman

et al. 2023

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…A prerequisite is the dispersion and distribution of the nanofillers inside polymer matrices, since strengthening of the composite relies on the interactions between the polymer and the surface area of the fillers. [1,41] PVA has been studied as a surface coating model system for testing additives to reduce chemical and electrochemical metal corrosion. [42,43] The barrier films provide tortuous diffusion pathways for corrosive electrolytes, delaying the metal corrosion process.…”

Section: Electrochemical Anticorrosion Tests Of F-bn Compositesmentioning

confidence: 99%

Turbostratic Boron–Carbon–Nitrogen and Boron Nitride by Flash Joule Heating

Chen

et al. 2022

Advanced Materials

View full text Add to dashboard Cite

Turbostratic layers in 2D materials have an interlayer misalignment. The lack of alignment expands the intrinsic interlayer distances and weakens the optical and electronic interactions between adjacent layers. This introduces properties distinct from those structures with well‐aligned lattices and strong coupling interactions. However, direct and rapid synthesis of turbostratic materials remains a challenge owing to their thermodynamically metastable properties. Here, a flash Joule heating (FJH) method to achieve bulk synthesis of boron–carbon–nitrogen ternary compounds with turbostratic structures by a kinetically controlled ultrafast cooling process that takes place within milliseconds (103 to 104 K s−1) is reported. Theoretical calculations support the existence of turbostratic structures and provide estimates of the energy barriers with respect to conversion into the corresponding well‐aligned counterparts. When using non‐carbon conductive additives, a direct synthesis of boron nitride is possible. The turbostratic nature facilitates mechanical exfoliation and more stable dispersions. Accordingly, the addition of flash products to a poly(vinyl alcohol) nanocomposite film coating a copper surface greatly improves the copper's resistance to corrosion in 0.5 m sulfuric acid or 3.5 wt% saline solution. FJH allows the use of bulk materials as reactants and provides a rapid approach to large quantities of the hitherto hard‐to‐access turbostratic materials.

show abstract

“…In general, if we use the traveltime of reflected waves from targets instead of a direct wave, we can monitor movement of targets at any place near the antennae. Abraham et al () showed that a mechanically rotated cavity‐backed dipole antenna in a borehole was able to measure, over a long period of time, tracer movement (oil in this case) near the borehole. This result implies that we might be able to monitor the movement of certain targets at considerable depth with the reflected waves, if we can estimate the direction of the arrival waves as well as their traveltime in a narrow space such as a borehole.…”

Section: Introductionmentioning

confidence: 99%

Experimental studies for monitoring water‐level by dipole‐antenna array radar fixed in the subsurface

Ebihara

Nagoya

Abe

et al. 2005

Near Surface Geophysics

View full text Add to dashboard Cite

We propose a method for monitoring the movement of moving targets, such as water‐level, at considerable depth, using dipole array‐type radar with the dipoles fixed at various positions in the subsurface. We report on monitoring the water‐level variation in a sand tank over several hours with the dipole‐antenna array. A dipole‐antenna with an optical modulator made of non‐metallic material is used as the receiving antenna element. The antenna has little effect on the electromagnetic field being measured, and the optical modulator does not need electrical power. The basic idea of a radar system fixed in a subsurface is to distribute the dipole‐antennae and to monitor the movement of a target, such as water distribution, over long periods of time, using scattered waves from the target. In order to demonstrate the validity of the radar system, we carried out laboratory experiments. We positioned several receiving dipole‐antennae with the optical modulators, in a small package inside the sand. We raised the height of the water‐level in the sand and measured waves scattered from the boundary between the saturated and unsaturated layers. We analysed the radar signals with the MUSIC algorithm utilizing Method of Moment analysis and monitored the 2D location of a moving scattering centre over several hours. By comparing the water‐level in a vertical borehole with the estimated positions, we found that the estimation is reasonable.

show abstract

Directional borehole radar tests of an oil injection experiment at the Colorado School of Mines, Golden, Colorado

Cited by 4 publications

References 0 publications

A cage-specific hydrate equilibrium model for robust predictions of industrially-relevant mixtures

A cage-specific hydrate equilibrium model for robust predictions of industrially-relevant mixtures

Turbostratic Boron–Carbon–Nitrogen and Boron Nitride by Flash Joule Heating

Experimental studies for monitoring water‐level by dipole‐antenna array radar fixed in the subsurface

Contact Info

Product

Resources

About