Search

Your search keyword '"Han, Hongkai"' showing total 16 results
Start Over Author "Han, Hongkai"
16 results on '"Han, Hongkai"'

2. Study on proppant migration and placement under sand-carrying action of clean fracturing fluid

Author

ZUO Weiqin, XIE Kunrong, HAN Hongkai, LIU Yanwei, ZHAO Fajun, and WANG Yang

Subjects
clean fracturing fluid, proppant, computational fluid dynamics, multiphase flow model, coalbed methane, Mining engineering. Metallurgy, TN1-997
Abstract

In order to explore the law of proppant migration and placement under clean fracturing fluid, an Euler multiphase flow model was established through FLUENT numerical simulation software based on computational fluid dynamics(CFD). The model takes into account the rheological properties of fracturing fluid and the friction and collision of proppant particles. The influence of proppant size, density and sand ratio on the shape of the sand dike is studied by using the equilibrium height and equilibrium time as the characterization parameters. The results show that the clean fracturing fluid is easier to carry the proppant to the depth of the fracture than the conventional fracturing fluid, so that the proppant is evenly distributed in the fracture; proppant with large particle size and high density can easily settle in the fracture opening under the carrying of the clean fracturing fluid, while proppant with small particle size and low density can improve the sand carrying capacity of fracturing fluid and transport proppant into deep fracture. Increasing sand ratio in a certain range can improve the height and laying area of the sand dike, but excessive sand ratio has little effect on the shape of the proppant sand dike and is easy to cause sand blockage.

Published
2022
Full Text
View/download PDF

13. Analysis and Modeling of Particle Velocities in Premixed Abrasive Water Jets

Author

Yanwei Liu, Fei Huang, Fuchang Hao, Han Hongkai, Zuo Weiqin, Huang Cheng, and Fajun Zhao

Subjects
0209 industrial biotechnology, Jet (fluid), Drag coefficient, QE1-996.5, Materials science, Article Subject, Nozzle, Abrasive, Geology, 02 engineering and technology, Mechanics, 021001 nanoscience & nanotechnology, Physics::Geophysics, Physics::Fluid Dynamics, 020901 industrial engineering & automation, Machining, General Earth and Planetary Sciences, Particle, Particle velocity, Impact, 0210 nano-technology
Abstract

The premixed abrasive jet possesses a strong strike ability and is widely used in oil and gas exploitation, machining, rust removal, and other fields. The superstrong, forceful impact of the premixed abrasive jet is mainly provided by high-speed abrasive groups. Hence, the abrasive velocity is the basis of this research, by applying the distribution law of abrasive impact force. In this paper, the particle velocity of the premixed abrasive jet is analyzed theoretically, and the corresponding particle velocity model is established. The real-time contrast interpolation method is employed to solve the problem of the variable drag coefficient. Factors such as the nozzle structure, average abrasive diameter, abrasive density, and jet flow are utilized to determine the abrasive velocity of the nozzle outlet. The numerical solution for the abrasive velocity is obtained by dividing the high-pressure pipe and nozzle into several sections, along the axis. Finally, the calculated particle velocity is compared with the particle image velocity measurement (PIV), to verify the correctness of the established model. These results demonstrate that the model calculation is in effective agreement with the experimental results. The deviation between the theoretical value and the experimental mean is 0.18 m/s. The standard deviation of the experimental results is 3.81-4.22 m/s, while the average error is less than 4%.

Published
2020

Catalog

Books, media, physical & digital resources
See catalog results