Raising the efficiency of piston-drive helium expansion engines

1985 ◽  
Vol 21 (12) ◽  
pp. 594-596
Author(s):  
V. D. Chernetskii ◽  
N. A. Mironova
Keyword(s):  
Helium Expansion

scholarly journals Comparative Porosity and Pore Structure Assessment in Shales: Measurement Techniques, Influencing Factors and Implications for Reservoir Characterization

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2094 ◽  
Author(s):  
Yujie Yuan ◽  
Reza Rezaee
Keyword(s):  
Pore Structure ◽  
Gas Adsorption ◽  
Measurement Techniques ◽  
Bound Water ◽  
Total Porosity ◽  
Low Pressure ◽  
Effective Porosity ◽  
Shale Formations ◽  
Helium Expansion ◽  
The Impact

Porosity and pore size distribution (PSD) are essential petrophysical parameters controlling permeability and storage capacity in shale gas reservoirs. Various techniques to assess pore structure have been introduced; nevertheless, discrepancies and inconsistencies exist between each of them. This study compares the porosity and PSD in two different shale formations, i.e., the clay-rich Permian Carynginia Formation in the Perth Basin, Western Australia, and the clay-poor Monterey Formation in San Joaquin Basin, USA. Porosity and PSD have been interpreted based on nuclear magnetic resonance (NMR), low-pressure N2 gas adsorption (LP-N2-GA), mercury intrusion capillary pressure (MICP) and helium expansion porosimetry. The results highlight NMR with the advantage of detecting the full-scaled size of pores that are not accessible by MICP, and the ineffective/closed pores occupied by clay bound water (CBW) that are not approachable by other penetration techniques (e.g., helium expansion, low-pressure gas adsorption and MICP). The NMR porosity is largely discrepant with the helium porosity and the MICP porosity in clay-rich Carynginia shales, but a high consistency is displayed in clay-poor Monterey shales, implying the impact of clay contents on the distinction of shale pore structure interpretations between different measurements. Further, the CBW, which is calculated by subtracting the measured effective porosity from total porosity, presents a good linear correlation with the clay content (R2 = 0.76), implying that our correlated equation is adaptable to estimate the CBW in shale formations with the dominant clay type of illite.

Simulation on helium expansion and quench in CICC for KSTAR with moving mesh methods

2002 ◽  
Vol 12 (1) ◽  
pp. 1591-1594 ◽  
Author(s):  
Qiuliang Wang ◽  
Jinliang He ◽  
Cheon Seog Yoon ◽  
Wooho Chung ◽  
Keeman Kim
Keyword(s):  
Moving Mesh ◽  
Helium Expansion ◽  
Moving Mesh Methods

Valveless helium expansion engine with piston sealed by friction members

1974 ◽  
Vol 10 (8) ◽  
pp. 754-756
Author(s):  
V. M. Dobrov ◽  
A. V. Belonogov
Keyword(s):  
Expansion Engine ◽  
Helium Expansion

Textolite piston for a helium expansion engine

Cryogenics ◽  
1964 ◽  
Vol 4 (2) ◽  
pp. 93-94
Author(s):  
I.B. Danilov
Keyword(s):  
Expansion Engine ◽  
Helium Expansion
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