Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Fushen Ren"'
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-14 (2024)
Abstract Based on the principle of light refraction and binocular ranging, the underwater imaging model is obtained. It provides a theoretical basis for underwater camera calibration. In order to meet the requirement of underwater vehicle to identify
Externí odkaz:
https://doaj.org/article/bcae31514c564aa7af93fec95edca79d
Publikováno v:
IEEE Access, Vol 12, Pp 123856-123871 (2024)
Layered water injection is an important means of oilfield development. However, the process is fraught with challenges due to the complexity of the subsurface environment and the variability in water absorption properties across different strata. The
Externí odkaz:
https://doaj.org/article/96cf93d16d92401c83d26036a47e11e6
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-1 (2024)
Externí odkaz:
https://doaj.org/article/e700179e5d4f4c0faff63e2ba8f15a6a
Publikováno v:
Applied Sciences, Vol 14, Iss 7, p 2820 (2024)
In this study, a portable magnetic adsorption amphibious robot which can operate on and below the waterline is developed for special curved environments, such as the pile legs of offshore platforms and the outer walls of ships. An open robot integrat
Externí odkaz:
https://doaj.org/article/b4466a41407349fe8a83bbc7b58e19b6
Publikováno v:
Alexandria Engineering Journal, Vol 60, Iss 1, Pp 1839-1849 (2021)
There are some difficult problems in deep and ultra-deep oil and natural gas drilling process due to the complex stress environment and hard formation, such as slow drilling speed, well deviation and high cost. As one of the important parameters to m
Externí odkaz:
https://doaj.org/article/27acab6c81f74e7998df8d4555282e13
Publikováno v:
PLoS ONE, Vol 16, Iss 4, p e0250588 (2021)
Aimed at the technical problems of low drilling speed and difficult rock-breaking in deep-well and hard rock-stratum, particle waterjet coupled impact rock-breaking technology in rotary drilling is put forward in this paper. Firstly, the working prin
Externí odkaz:
https://doaj.org/article/2bb262e202d149ee89a0123a63539a8d
Publikováno v:
Shock and Vibration, Vol 2020 (2020)
Particle jet impact drilling technology is an efficient method which mainly uses high-velocity particles to break rock. As the important criterion for evaluating rock-breaking effect, rock-breaking depth and damage area were studied in this paper. Fi
Externí odkaz:
https://doaj.org/article/3e0725074d5f44a9ba2177d64c28129d
Publikováno v:
Shock and Vibration, Vol 2020 (2020)
Stick-slip is very harmful to the service life of drillstring. The extended Hamilton principle is applied in the paper. Then, finite element method (FEM) is employed to describe the model. The drillstring-borehole impact and friction, fluid-structure
Externí odkaz:
https://doaj.org/article/35506b9c15f94002adbfb34cc8aafa11
Publikováno v:
Shock and Vibration, Vol 2017 (2017)
Buckling of tubulars has been the subject of many researches in the past. However, the models in previous research always followed the same assumptions: the friction and rotation effects are ignored. The assumptions are relatively far from the realit
Externí odkaz:
https://doaj.org/article/7b0a26c8d6a1441688f93502e7726f41
Publikováno v:
Shock and Vibration, Vol 2016 (2016)
A nonlinear dynamics model and qualitative analysis are presented to study the key effective factors for coupled axial/torsional vibrations of a drill string, which is described as a simplified, equivalent, flexible shell under axial rotation. Here,
Externí odkaz:
https://doaj.org/article/b828dcd64106448eafcddf9826097dc0