Insights into the Role of Dipentaerythritol in the Thermodynamics and Nucleation Behavior of a Pentaerythritol–Water System

2021 ◽  
Author(s):  
Haoyu Peng ◽  
Ningning Tian ◽  
Changyou Yu ◽  
Ye Gao ◽  
Kangli Li ◽  
...  
Keyword(s):  
Water System ◽  
Nucleation Behavior

scholarly journals New insights into the mechanisms of ultrasonic emulsification in the oil-water system and the role of gas bubbles

2021 ◽  
pp. 105501
Author(s):  
W.H. Wu ◽  
D.G. Eskin ◽  
A. Priyadarshi ◽  
T. Subroto ◽  
I. Tzanakis ◽  
...  
Keyword(s):  
Water System ◽  
Gas Bubbles ◽  
Ultrasonic Emulsification ◽  
Oil Water

Radiolysis of the polyethylene/water system: Studies on the role of hydroxyl radical

2010 ◽  
Vol 79 (1) ◽  
pp. 36-40 ◽  
Author(s):  
Nicolas Billamboz ◽  
Manuel Grivet ◽  
Sarah Foley ◽  
Gérard Baldacchino ◽  
Jean-Charles Hubinois
Keyword(s):  
Hydroxyl Radical ◽  
Water System

scholarly journals The Role of Nucleation Behavior in Phase-Field Simulations of the Austenite to Ferrite Transformation

2008 ◽  
Vol 39 (6) ◽  
pp. 1237-1247 ◽  
Author(s):  
M.G. Mecozzi ◽  
M. Militzer ◽  
J. Sietsma ◽  
S. van der Zwaag
Keyword(s):  
Phase Field ◽  
Nucleation Behavior ◽  
Ferrite Transformation

scholarly journals A new slick water system for hydraulic fracturing in tight reservoir to enhance imbibition oil recovery

2021 ◽  
Vol 303 ◽  
pp. 01001
Author(s):  
Yu Haiyang ◽  
Ji Wenjuan ◽  
Luo Cheng ◽  
Lu Junkai ◽  
Yan Fei ◽  
...  
Keyword(s):  
Contact Angle ◽  
Interfacial Tension ◽  
Hydraulic Fracturing ◽  
Oil Recovery ◽  
Water System ◽  
Natural Fracture ◽  
Fracturing Fluid ◽  
The Core ◽  
Ultralow Permeability

In order to give full play to the role of imbibition of capillary force and enhance oil recovery of ultralow permeability sandstone reservoir after hydraulic fracturing, the mixed water fracture technology based on functional slick water is described and successfully applied to several wells in oilfield. The core of the technology is determination of influence factors of imbibition oil recovery, the development of new functional slick water system and optimization of volume fracturing parameters. The imbibition results show that it is significant effect of interfacial tension, wetting on imbibition oil recovery. The interfacial tension decreases by an order of magnitude, the imbibition oil recovery reduces by more than 10%. The imbibition oil recovery increases with the contact angle decreasing. The emulsifying ability has no obvious effect on imbibition oil recovery. The functional slick water system considering imbibition is developed based on the solution rheology and polymer chemistry. The system has introduced the active group and temperature resistant group into the polymer molecules. The molecular weight is controlled in 1.5 million. The viscosity is greater than 2mPa·s after shearing 2h under 170s-1 and 100℃. The interfacial tension could decrease to 10-2mN/m. The contact angle decreased from 58° to 22° and the core damage rate is less than 12%. The imbibition oil recovery could reach to 43%. The fracturing process includes slick water stage and linear gel stage. 10% 100 mesh ceramists and 8% temporary plugging agents are carried into the formation by functional slick water. 40-70 mesh ceramists are carried by linear gel. The liquid volume ratio is about 4:1 and the displacement is controlled at 10-12m3/min. The sand content and fracturing fluid volumes of single stage are 80m3 and 2500 m3 respectively. Compared with conventional fracturing, due to imbibition oil recovery, there is only 25% of the fracturing fluid flowback rate when the crude oil flew out. When the oil well is in normal production, about 50% of the fracturing fluid is not returned. It is useful to maintain the formation energy and slow down the production decline. The average cumulative production of vertical wells is greater than 2800t, and the effective period is more than 2 years. This technology overcoming the problem of high horizontal stress difference and lack of natural fracture has been successfully applied in Jidong Oilfield ultralow permeability reservoir. The successful application of this technology not only helps to promote the effective use of ultralow permeability reservoirs, but also helps to further clarify the role of imbibition recovery, energy storage and oil-water replacement mechanism.

Suppression Features of a Vapor Explosion With Prototypic Reactor Materials

2008 ◽  
Author(s):  
S. W. Hong ◽  
J. H. Kim ◽  
B. T. Min ◽  
I. K. Park ◽  
H. D. Kim
Keyword(s):  
Void Fraction ◽  
Steam Explosion ◽  
Volume Fraction ◽  
Water System ◽  
High Volume ◽  
Point Of View ◽  
Vapor Explosion ◽  
Reactor Material ◽  
Zro2 System

The suppression of a vapor explosion is reviewed from a void fraction point of view from previous research results and the results of an experiment and analysis for TROI using a prototypic reactor material. In a tin-water system, a high fraction of air which played the role of a steam reduced the peak pressure of a steam explosion. According to the sensitivity analysis that was carried out with an increase in the vapor volume fraction, an energetic vapor explosion hardly took place in the mixture with a high void fraction. In higher vapor fraction conditions (αv> 0.3), the vapor explosion was very weak. A prototypic corium shows a relatively high void fraction compared to the ZrO2 which is known as an explosive material because the corium system generated many smaller particles compared to the ZrO2 system. The corium system shows a relatively low explosivity compared to the ZrO2 system because the high void fraction of the corium system plays the role of preventing a contact between the water and the hot melt drops in the triggering stage. When considering the experimental results for the role of air instead of steam, an air supply system to provide a high volume fraction during a premixing process can radically prevent and/or mitigate a steam explosion.

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