Cross‐well pressure test analysis for CO 2 plume characterization based on arrival time and peak pressure change observations

2021 ◽  
Author(s):  
Mehdi Zeidouni
Keyword(s):  
Arrival Time ◽  
Peak Pressure ◽  
Pressure Change ◽  
Test Analysis ◽  
Pressure Test

Tracer- and Pressure-Test Analysis for Characterization of Areally Heterogeneous Reservoirs

1991 ◽  
Vol 6 (01) ◽  
pp. 45-54 ◽  
Author(s):  
Srikanta Mishra ◽  
William E. Brigham ◽  
Franklin M. Orr
Keyword(s):  
Test Analysis ◽  
Heterogeneous Reservoirs ◽  
Pressure Test

Effects of Direction and Rate of Ear-Canal Pressure Changes on Tympanometric Measures

1986 ◽  
Vol 29 (1) ◽  
pp. 11-19 ◽  
Author(s):  
Janet E. Shanks ◽  
Richard H. Wilson
Keyword(s):  
Phase Angle ◽  
Peak Pressure ◽  
Pressure Change ◽  
General Purpose ◽  
Ear Canal ◽  
Angle Data ◽  
General Purpose Computer ◽  
The Difference ◽  
Pressure Changes ◽  
Purpose Computer

The effects of the direction (ascending and descending) and rate (12.5, 25.0, and 50.0 daPa/s) of ear-canal pressure changes on three tympanometric measures (peak static admittance, shape, and typanometric peak pressure) were studied in 24 adults with normal middle-ear transmission systems. Susceptance, conductance, admittance, and phase angle data for the six conditions both at 226 and 678 Hz were obtained using a general purpose computer. Peak static admittance was significantly affected by both the rate and direction of pressure change as evidenced by a decrease in phase angle for ascending and for fast rates of ear-canal pressure change. Tympanometric shape was broader for descending pressure changes with less frequent notching both for descending and for slow rates of pressure change. Finally, the difference in peak pressure for the two directions of pressure change increased with the rate of ear-canal pressure change.

A New Method of Negative Expiratory Pressure Test Analysis Detecting Upper Airway Flow Limitation To Reveal Obstructive Sleep Apnea

CHEST Journal ◽  
2005 ◽  
Vol 128 (4) ◽  
pp. 2159-2165 ◽  
Author(s):  
Giuseppe Insalaco ◽  
Salvatore Romano ◽  
Oreste Marrone ◽  
Adriana Salvaggio ◽  
Giovanni Bonsignore
Keyword(s):  
Obstructive Sleep Apnea ◽  
Sleep Apnea ◽  
Upper Airway ◽  
New Method ◽  
Flow Limitation ◽  
Test Analysis ◽  
Obstructive Sleep ◽  
Pressure Test

scholarly journals Permeability Damage and Supercritical Fluid Storage in the Cauvery Basin Neyveli Lignite Bed Containing Kaolinite Deposits during Alternative Injection of Brine and CO2

2020 ◽  
Author(s):  
Perumal Rajkumar ◽  
Justine K. Antony ◽  
Selvaraj Mahalingam ◽  
Rakesh Ravi Shankar ◽  
Ramadoss Kesavakumar ◽  
...  
Keyword(s):  
Microstructural Analysis ◽  
Pressure Change ◽  
High Rate ◽  
Coal Bed ◽  
Structural Collapse ◽  
Two Phase ◽  
Test Analysis ◽  
Coal Beds ◽  
Fluid Saturation ◽  
Permeability Damage

Abstract A laboratory based investigation has been conducted on permeability damage and CO2 storage or retention in the lignite core during alternative injection of brine and supercritical carbon dioxide. Moreover, anthracite and bituminous coal beds were focused by the scientific community for effective production and reservoir formation damage study. But, now-a-days, lignite based coal bed methane reservoirs have attracted attention for productive exploitation and formation collapse investigation. Hence, for this purpose, a single component injection two phase (Brine + Supercritical CO2) coreflood test analysis under alternative injections were performed to investigate the occurrence of lignite structural collapse, permeability damage, injectivity decline and CO2 retention as well. The experimental study reveals that, due to gravity segregation there is a high rate of fluid saturation in lignite core and also, moderate level of heat transfer coefficient was also noted. Also, lignite core structural collapse under the brine and supercritical CO2 injection at different velocities resulted in huge volume of coal and kaolinite fines concentration. Kaolinite and coal fines migration resulted in pressure change and permeability decline in lignite core. The suspensions produced were passed to microstructural analysis and it revealed that kaolinite fine particle tends to possess a leaflet geometrical structure, which obstructed the cleats and restricted the fluid flow. Subsequently, hysteresis modelling (Pranesh 2018) was applied to this problem to quantify the amount of CO2 retention in lignite core. Additionally, statistical model, multiple linear regression was applied to this problem to validate the experimental model, which showed good agreement.

scholarly journals Earthquake-induced hydrologic changes in the geoengineered schist landslides of Cromwell Gorge, Central Otago

2021 ◽  
Author(s):  
◽  
Grant O'Brien
Keyword(s):  
Groundwater Level ◽  
Recovery Time ◽  
Hydraulic Properties ◽  
Peak Pressure ◽  
Pressure Change ◽  
Monitoring Site ◽  
Flow Rates ◽  
Time To Peak ◽  
Hydrological Responses ◽  
Groundwater Level Changes

<p>Geoengineered groundwater systems located within seven large (> 100 ha surface area), deep-seated, slow-creep schist landslides in Cromwell Gorge (Otago, New Zealand) are observed to respond systematically to 10 large (>Mw6.2), regional earthquakes at epicentral distances of 130-630 km. The permeabilities of the schist landslides have previously been reported to be c. 1 x 10⁻¹⁷ - 4 x 10⁻⁶ m2 and the permeability structure is dominated by large fracture zones. Of the 315 hydrological instruments in the gorge for which data have been analysed, 21 monitoring well piezometers record repeated metre- or centimetre-scale groundwater level changes, and 12 underground V-notch weirs record elevated flow rates induced by the same earthquakes. Groundwater level changes exhibit consistent temporal characteristics at all monitoring sites, namely a time to peak pressure change on the order of one month and a subsequent recovery period on the order of one year. Changes in weir flow rate are near-instantaneous with maximum flow rates reached within 0-6 hours, followed by recession periods on the order of one month. Hydrological responses to different earthquakes at each monitoring site are systematic in terms of polarity and amplitude. This comprehensive dataset enables consistent patterns in the amplitude, time to peak pressure change and recovery time of groundwater level changes, and elevated weir discharge volumes in response to earthquake shaking to be documented. Earthquakes inducing hydrological responses have been categorised into five categories based on shaking characteristics (duration, bandwidth and amplitude). Larger hydrological responses and proportionally shorter time to peak pressure change and recovery time are associated with long duration (25-50 s or longer), high-amplitude, broad bandwidth shaking. The larger amplitudes of hydrological response and proportionally shorter times to peak pressure change and recovery times, are interpreted to represent greater temporary enhancement of the landslides hydraulic properties, particularly permeability. Understanding how earthquakes can enhance or otherwise affect hydraulic properties such as permeability in fractured reservoirs is intrinsically important and may prove of economic utility for both the geothermal and hydrocarbon energy sectors.</p>

Tympanometric Changes at 226 Hz and 678 Hz Across 10 Trials and for Two Directions of Ear Canal Pressure Change

1984 ◽  
Vol 27 (2) ◽  
pp. 257-266 ◽  
Author(s):  
Richard H. Wilson ◽  
Janet E. Shanks ◽  
Susan K. Kaplan
Keyword(s):  
Young Adults ◽  
Middle Ear ◽  
Peak Pressure ◽  
Pressure Change ◽  
Transmission System ◽  
Ear Canal ◽  
Acoustic Admittance ◽  
Pressure Peak ◽  
The Mean

The influence that repeated tympanometric trials have on the aural-acoustic admittance characteristics of the middle-ear transmission system was studied in 24 young adults. The 226-Hz and 678-Hz data were generated by concurrently digitizing the conductance and admittance tympanograms at 25 daPa/s for both ascending and descending pressure directions. Ten successive trials for each frequency and direction of pressure change were made. Changes in admittance corrected for ear canal volume across the 10 tympanometrie trials were computed. The results demonstrated that generally admittance increases as the number of trials increases. For many subjects, the complexity of the tympanometric configuration also increases across trials. The results from eight subjects with single-peaked 678-Hz tympanograms were compared with the results from eight subjects with notched 678-Hz tympanograms to explain the mean decrease in susceptance across tympanometric trials. Finally, the pressure peak locations of the conductance, susceptance, and admittance tympanograms were evaluated and are discussed. The effects that differences in peak pressure location have on the computed static admittance values are presented.

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