Diagnosis of in Situ Air Sparging Performance Using Groundwater Pressure Changes During Startup and Shutdown

2001 ◽  
Author(s):  
Richard L. Johnson ◽  
Paul C. Johnson ◽  
Tim L. Johnson ◽  
Neil Thomas ◽  
Andrea Leason
Keyword(s):  
Air Sparging ◽  
Pressure Changes

Diagnosis of In Situ Air Sparging Performance Using Transient Groundwater Pressure Changes during Startup and Shutdown

2001 ◽  
Vol 5 (4) ◽  
pp. 299-320 ◽  
Author(s):  
Richard L. Johnson ◽  
Paul C. Johnson ◽  
Tim L. Johnson ◽  
Neil R. Thomson ◽  
Andrea Leeson
Keyword(s):  
Air Sparging ◽  
Pressure Changes

Using earth-tide induced water pressure changes to measure in situ permeability: A comparison with long-term pumping tests

2016 ◽  
Vol 52 (4) ◽  
pp. 3113-3126 ◽  
Author(s):  
Vincent Allègre ◽  
Emily E. Brodsky ◽  
Lian Xue ◽  
Stephanie M. Nale ◽  
Beth L. Parker ◽  
...  
Keyword(s):  
Water Pressure ◽  
Earth Tide ◽  
Pumping Tests ◽  
In Situ Permeability ◽  
Pressure Changes

Remote effects of pressure changes in arterioles

1995 ◽  
Vol 268 (3) ◽  
pp. H1379-H1382 ◽  
Author(s):  
R. J. Rivers
Keyword(s):  
Cheek Pouch ◽  
Pressure Flow ◽  
Isolated Segment ◽  
Myogenic Responses ◽  
Pressure Changes ◽  
Remote Response

Blood is distributed to match the demands of the tissue in accordance with the local effectors of pressure, flow, nerves, and metabolites. Influences of these effectors are integrated and communicated to larger vessels to create a coordinated upstream response that allows for the blood required to meet the metabolic demands of the tissue. Each effector's contribution to the communicated response is unknown. In the present study in situ segments of arteriole, within the cheek pouch of the anesthetized hamster, were isolated from the pressure and flow of the surrounding vasculature while maintaining electrotonic continuity. Pressure was transiently increased or decreased (-70 to +120 cmH2O) for 60 s. These pressure changes within the isolated segment caused myogenic responses within the isolated segment as well as changes in diameter at remote arteriolar locations (ranging from -8 to 5 microns) that were outside the isolated segment and insulated from the changes in pressure. The size of the remote response correlated significantly with the change in pressure inside the isolated segment. This demonstrates that the effects of pressure changes in arterioles are communicated to neighboring portions of the vasculature.

Air distribution in the Borden aquifer during in situ air sparging

2003 ◽  
Vol 67 (1-4) ◽  
pp. 113-132 ◽  
Author(s):  
D.W. Tomlinson ◽  
N.R. Thomson ◽  
R.L. Johnson ◽  
J.D. Redman
Keyword(s):  
Air Distribution ◽  
Air Sparging

Influences of oxygen impurity contained in nitrogen gas on the reactions of chromium with nitrogen

2005 ◽  
Vol 20 (10) ◽  
pp. 2745-2753 ◽  
Author(s):  
Yung-Shou Ho ◽  
Fong-Shung Huang ◽  
Fu-Hsing Lu
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Oxygen Impurity ◽  
Nitrogen Gas ◽  
Available Nitrogen ◽  
Increasing Temperature ◽  
Pressure Changes ◽  
Annealing Experiments ◽  
Simultaneous Dissolution

In this research, the influences of the oxygen impurity contained in the commercially available nitrogen gas on the reactions of chromium pellets with nitrogen were investigated in the temperature range 600–1350 °C. A small amount of oxygen competed with the majority N2 to react with chromium in the annealing process. Analyzing the in situ oxygen partial pressure changes during annealing proved that the dissolution of oxygen in Cr and/or resultant CrxN (CrN or Cr2N) was exothermic and the solubility decreased with increasing temperature. It was found that the oxygen partial pressure decreased drastically to about 10−22 atm when specimens were annealed at 600 °C compared to a mere 10−5 atm for a blank test, while its value increased with temperature. The oxidation involved simultaneous dissolution of oxygen in specimens and formation of oxide scale. Moreover, comparing the aforementioned results with those obtained from additional annealing experiments preformed in argon gas showed that the formation of Cr2O3 might stem mainly from oxidation of the resultant nitrides instead of the metallic chromium.

Wellbore Failure During Water-Alternating-Gas Injection by Use of Flow-Stress Coupling Method

SPE Journal ◽  
2016 ◽  
Vol 22 (01) ◽  
pp. 172-183 ◽  
Author(s):  
Mahmood Bataee ◽  
Sonny Irawan ◽  
Syahrir Ridha ◽  
Hamed Hematpour ◽  
Zakaria Hamdi
Keyword(s):  
Coupling Method ◽  
Injection Wells ◽  
Iterative Coupling ◽  
Water Alternating Gas ◽  
Porosity And Permeability ◽  
Volume Method ◽  
Pressure Changes ◽  
Wellbore Failure

Summary Accurate evaluation of failure pressure is crucial in the design of injection wells. Besides, in-situ stresses play an important role in obtaining the results. Pressure and rock stresses are related together as the role of effective-stress theorem. In fact, pressure changes with stress alteration caused by change in porosity and permeability. Therefore, it should be obtained with the coupling method. Moreover, to calculate pressure, temperature, and stress in the fully coupling method, a huge matrix should be solved, and it takes long processing time to implement it. Therefore, this study developed a wellbore geomechanical model for stability during injection by use of the iterative coupling method. The processing speed was enhanced in this study because the parameters were calculated separately. The parameters of pressure, temperature, saturation, and stress were obtained for the multiphase-flow condition with numerical modeling. Furthermore, in this study, the finite-difference method (FDM) had been used to solve pressure, temperature, and saturation, whereas the finite-volume method (FVM) was applied to solve the wellbore stress. On top of that, the iterative coupling method was used to improve the accuracy of the stress results. As a result, a correction of approximately 20 psi (0.14 MPa) was noted for pressure in relation to stress, which is 1 psi (6.89 kPa). Moreover, the Drucker-Prager failure criterion was used to model the fracturing on the basis of the stress results. Other than that, sensitivity analysis on horizontal maximum (σH) and minimum (σh) stresses showed that by increasing σH, the maximum injection pressures to avoid fracturing had been reduced, whereas in the case for σh, an increment was observed.

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