Results 21 to 30 of about 2,021,478 (258)

Investigation on reverse flow characteristics in U-tubes under two-phase natural circulation

Nuclear Engineering and Technology, 2020
The vertically inverted U-tube steam generator (UTSG) is widely used in the pressurized water reactor (PWR). The reverse flow behavior generally exists in some U-tubes of a steam generator (SG) under both single- and two-phase natural circulations (NCs).
Xi Chu, Mingrui Li, Wenzhen Chen, Jianli Hao   +3 more
doaj   +2 more sources

Parametrical design and optimization of a reverse circulation drill bit for dust control [PDF]

Frontiers in Built Environment
The reverse circulation down-the-hole air hammer drilling (RC-DTH) method is renowned for its efficiency in hard rock formations and exceptional dust control performance.
Liming Fan, Zhilin Li, Yongjiang Luo
doaj   +2 more sources

Mathematical model of velocity and distribution law in gas lift reverse circulation well washing flow field for drilling shaft sinking. [PDF]

Sci Rep
Guo L, Cheng H, Yao Z, Rong C, Lin J, Wang X.   +5 more
europepmc   +3 more sources

A numerical study of density-unstable reverse circulation displacement for primary cementing

Journal of energy resources technology, 2022
Primary cementing of the casing string is the operation where the annular space behind the casing is displaced to a cement slurry. Once hardened, the cement should form a solid annular barrier and provide zonal isolation behind the casing.
H. J. Skadsem, S. Kragset
semanticscholar   +1 more source

Numerical Simulation Study of a Swirling Drill Bit Used for Ice Core Drilling

Journal of Marine Science and Engineering, 2022
Due to its high mechanical penetration rate and lack of pollution of the environment, air reverse circulation drilling is considered to be a promising method for ice drilling.
Mengke Wang, Wenbo He, Minqi Wang, Jine Cao, Pinlu Cao   +4 more
doaj   +1 more source

Simulation on a new reverse circulation fishing tool: Design and evaluation of the salvage capacity and efficiency

Energy Science & Engineering, 2023
To solve the insufficient energy for reverse circulation fishing tools in complex structure wells, it is necessary to further optimize the design of the tools to improve the impurity salvage efficiency.
Yumei Li, Na Si, Tao Zhang, Ming Liu, Liwei Yu, Yiming Zheng   +5 more
doaj   +1 more source

Gas reverse circulation drilling technology for large-diameter DTH hammer

Meikuang Anquan, 2023
Large diameter DTH hammer is a drilling tool which has been proved by a lot of engineering practice and can improve the construction efficiency of large diameter drilling on mine surface. However, after drilling into the aquifer, the penetration rate of
ZHAO Jiangpeng
doaj   +1 more source

Application of hydraulic reverse circulation coring in exploration of concealed geological abnormal body in coal mine

Meikuang Anquan, 2021
According to the characteristics of shallow depth of collapse column and fault coring borehole in mining face, the hydraulic reverse circulation coring method of horizontal hole is proposed.
ZHAO Jiangpeng
doaj   +1 more source

Design Method of Center Pipe Embedded in Reverse Circulation Sampling Pipe Used in Coal Mine

Meikuang Anquan, 2020
Based on the classification and principle of pneumatic conveying system, the technical characteristics of reverse circulation fixed-point sampling device in underground coal mine are analyzed.
ZHANG Rui
doaj   +1 more source

Study on the Effect of the Water Injection Rate on the Cavern Leaching Strings of Salt Cavern Gas Storages

Energies, 2022
In the early construction of cavern leaching in salt cavern gas storages, the inner leaching tubing is often blocked, frequently leading to the bending deformation phenomenon of the leaching strings, which can result in out-of-control cavity shapes.
Shengwei Dong, Taian Fang, Jifang Wan, Xuhui Hu, Jingcui Li, Hangming Liu, Dongyang Li, Shaofeng Qiao   +7 more
doaj   +1 more source