Results 1 to 10 of about 270 (70)

Examples of discriminating the downward depth and downward timing of the velocity string in the water-producing gas well [PDF]

E3S Web of Conferences, 2021
The problem of bottom hole effusion is an important reason for the reduction and even shutdown of natural gas wells. Downward velocity string is an important drainage gas recovery process, which can improve the flow rate of gas and discharge more liquid ...
Yang Jing, Guo Minhao, Le Yan, Fan Xin, Wang Haiyang, Zhou Desheng   +5 more
doaj   +1 more source

String breaking in a cold wind as seen by string models

Nuclear Physics B, 2022
Using the gauge/string duality, we model a heavy quark-antiquark pair in a color singlet state moving through a cold medium and explore the consequences of temperature and velocity on string breaking. In doing so, we restrict to the case of two dynamical
Oleg Andreev
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Effect of Annular Gas-Liquid Two-Phase Flow on Dynamic Characteristics of Drill String

Shock and Vibration, 2021
Natural gas hydrate (NGH) is a kind of new type green energy source with giant reserves which has been thought of highly by energy explorers in the world.
Baojin Wang, Zhongyang Wang, Liuci Wang, Pengyu Sun   +3 more
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String breaking and running coupling of QQ¯ in a rotating media from holography

Physics Letters B, 2023
Through gravity/gauge duality, the string breaking and running coupling constant of heavy quark-antiquark pair are investigated in the rotating background.
Jing Zhou, Saiwen Zhang, Jun Chen, Le Zhang, Xun Chen   +4 more
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Superradiance and black resonator strings encounter helical black strings

Journal of High Energy Physics, 2023
We construct a cohomogeneity-1 helical black string in six-dimensional Einstein gravity. The helical solution branches from the onset of the gravitational superradiant instability of the equal-spinning Myers-Perry black string.
Óscar J. C. Dias, Takaaki Ishii, Keiju Murata, Jorge E. Santos, Benson Way   +4 more
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Modelling Wave Transmission for Transient Flow and Amplitude-Frequency Characteristics of Tubular String in a Water Injection Well

Applied Sciences, 2023
Fluid wave code communication is used in layered water injection intelligent monitoring systems, but a model of fluid transient flow wave signal transmission is still unknown.
Eryang Ming, Cong Li, Huiqing Lan, Jiaqing Yu, Lichen Zheng, Xiaohan Pei   +5 more
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Stick–Slip Vibration Characteristics Study of the Drill String Based on PID Controller

Energies, 2023
In order to address the issue of drill string stick–slip vibration, which leads to drill bit wear and reduces the drilling velocity, we conducted a study on the characteristics of stick–slip vibration using a proportional-integral-derivative (PID ...
Baoyong Yan, Jialin Tian, Xianghui Meng, Zhe Zhang   +3 more
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Integral Hoisting Remote Control Heavy Load Tower for Coiled Tubing Operation

Shiyou jixie, 2021
When the velocity string operation was carried out in South Sulige Block, the existing tower could not meet the requirements of field construction, therefore, the integral hoisting remote control heavy load tower was developed.
Liu Pingguo, Zhou Zhongcheng, Yang Gao, Wei Dong, Duan Wenyi, Yuan Wencai, Kang Kai   +6 more
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BTZ trailing strings

Journal of High Energy Physics, 2020
We compute holographically the energy loss of a moving quark in various states of the D1-D5 CFT. In the dual bulk geometries, the quark is the end of a trailing string, and the profile of this string determines the drag force exerted by the medium on the
Iosif Bena, Alexander Tyukov
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Cause Analysis and Preventive Strategy of Gas Production Reduction by Velocity String Deliquification

Shiyou jixie, 2020
It has been found in practice that the production of many gas wells has decreased after running the velocity string. To explain this phenomenon, firstly, using the 65 well-time velocity string flow pressure test data reported in the public literature ...
Liu Tong, Zhu Jiang, Lu Zhiming
doaj