High-throughput assessment of catalyst stability during autothermal reforming of model biogas

2015 ◽  
Vol 5 (9) ◽  
pp. 4390-4397 ◽  
Author(s):  
M. Luneau ◽  
Y. Schuurman ◽  
F. C. Meunier ◽  
C. Mirodatos ◽  
N. Guilhaume
Keyword(s):  
High Throughput ◽  
Flow Reactor ◽  
Autothermal Reforming ◽  
Parallel Flow ◽  
Catalyst Stability ◽  
Term Stability ◽  
Long Term Stability ◽  
Set Up

A six parallel-flow reactor set-up was implemented to assess the long-term stability of Ni-based catalysts for autothermal reforming of model biogas.

scholarly journals A survey of short-term and long-term stability of tube parameters in a mammography unit

2014 ◽  
Vol 29 (4) ◽  
pp. 321-325
Author(s):  
Jovica Praskalo ◽  
Jasna Davidovic ◽  
Biljana Kocic ◽  
Monika Zivkovic ◽  
Svetlana Pejovic
Keyword(s):  
Screening Program ◽  
Short Term ◽  
X Ray ◽  
Term Stability ◽  
Long Term Stability ◽  
Mammography Screening Program ◽  
The Republic ◽  
Set Up ◽  
The Given

In order to set up a successful mammography screening program in the Republic of Srpska, a Siemens Mammomat 1000 X-ray machine was selected for analysis as the said mammography system is widely used in clinical practice. The variations in tube parameters (specific air kerma, high-voltage accuracy and reproducibility, linearity between exposure and dose exposure time) were monitored over a five-year period, from 2008 to 2012. In addition, due to observed daily fluctuations for chosen parameters, a series of measurements were performed three times a day within a single-month period (mainly October 2012). The goal of such an experimental set up is to assess short-term and long-term stability of tube parameters in the given mammography unit and to make a comparison between them. The present paper shows how an early detection of significant parameter fluctuations can help eliminate irregularities and optimize the performance of mammography systems.

Systematic Selection of Drill-In and Completion Fluids for Development of the Dvalin HT Gas Field - Part II: Successful Clean-Up Validates Experimental Qualification Approach

2021 ◽  
Author(s):  
Oliver Czuprat ◽  
Kjetil Eriksen ◽  
Duncan Clinch ◽  
Piotr Byrski ◽  
Garbhan Gibbons ◽  
...  
Keyword(s):  
High Pressure ◽  
Drilling Fluid ◽  
Lag Time ◽  
High Permeability ◽  
Vertical Orientation ◽  
Gas Field ◽  
Term Stability ◽  
Long Term Stability ◽  
Set Up

Abstract Formation damage by the drill-in fluid has been identified as a major risk for the Dvalin HT gas field. To ensure the long-term stability and mobility of the mud even after an extended suspension time between drill-in and clean-up of the wells, a novel static aging test under downhole temperature and high pressure was conducted. Experiments have shown that the downhole stability is commonly underestimated when the surrounding pressure is lower than in the field. Thus, a high-pressure cylinder was used in vertical orientation in a heating oven with a pressure pump regulating the pressure up to 200 bar. The reservoir section was drilled with the optimized organo-clay-free oil-based drilling fluid (OCFOBDF) specified in the qualification phase. Tracers in the lower completion were used to identify clean-up from the upper high-permeability streak and the deeper (relatively lower) high-permeability streak. Due to extended wait on weather after drilling and completion of the first of the four wells, the lag time until clean-up was almost 11 weeks (74 days). It could be experimentally shown that the qualified OCFOBDF system weighted with micron sized barite remains mobile without phase separation even after static aging at 160 °C and 200 bar for the maximum estimated lag time between drilling and clean-up of 3 months. The absence of a gas cap in the set-up also better represents downhole conditions in the reservoir section and has shown that it improves the fluid´s stability. The clean-up of the well was successful with a maximum flowrate of 3.0 MM Sm3/d. Analysis of the tracers has proven that clean-up was successful for the entire reservoir section, including the deeper part. It could be concluded that in alignment with the lab tests that the mud fulfilled its requirement to be mobile even up to three months. Because of the superior properties, settling of solids (bridging and weighting material) could be avoided, resulting in no blockage of the (lower part of the) reservoir. The use HPHT aging has been the key to proving the long-term stability and mobility of the combined Drill-In and Completion Fluid. This technique falls outside of current API RP testing practices but is believed to be highly beneficial for qualification of fluids that will be left in the lower completion for long periods, especially in open hole completions under high temperature and pressure.

“Enzyme Test Bench,” a high-throughput enzyme characterization technique including the long-term stability

2009 ◽  
Vol 103 (2) ◽  
pp. 305-322 ◽  
Author(s):  
Kirill Rachinskiy ◽  
Hergen Schultze ◽  
Matthias Boy ◽  
Uwe Bornscheuer ◽  
Jochen Büchs
Keyword(s):  
High Throughput ◽  
Test Bench ◽  
Enzyme Characterization ◽  
Term Stability ◽  
Long Term Stability ◽  
Characterization Technique ◽  
Enzyme Test

scholarly journals High Throughput Prediction of the Long-Term Stability of Pharmaceutical Macromolecules from Short-Term Multi-Instrument Spectroscopic Data

2014 ◽  
Vol 103 (3) ◽  
pp. 828-839 ◽  
Author(s):  
Nathaniel R. Maddux ◽  
Vidyashankara Iyer ◽  
Weiqiang Cheng ◽  
Ahmed M.K. Youssef ◽  
Sangeeta B. Joshi ◽  
...  
Keyword(s):  
High Throughput ◽  
Spectroscopic Data ◽  
Short Term ◽  
Term Stability ◽  
Long Term Stability

Calibration and long-term stability of a PIXE set-up

1981 ◽  
Vol 181 (1-3) ◽  
pp. 81-88 ◽  
Author(s):  
Gerd I. Johansson ◽  
Jan Pallon ◽  
Klas G. Malmqvist ◽  
K.Roland Akselsson
Keyword(s):  
Term Stability ◽  
Long Term Stability ◽  
Set Up
Sign in / Sign up

Export Citation Format

Share Document