Results 51 to 60 of about 235,356 (289)
Vibrational Analysis of a Drill String [PDF]
, 2020 In drilling processes, dynamic vibrations are the leading causes of damages to drilling equipment. This damage can happen on the borehole wall, the drill string, and at the bottom hole assembly.
Allen, Matthew, Feeney, Gage
core +1 more source
Study on Drill String Stick-slip Vibration Pattern Under Bit-Rock Interaction
Shiyou jixie, 2023 Stick-slip vibration leads to high-frequency shear stress on drill string and premature fatigue of drill string.Therefor,the torsional vibration model of drill string system considering bit-rock interaction was built by coupling the bit-rock interaction ...
Xing Xuesong +4 more
doaj
Aspects of Topological String Theory [PDF]
, 2008 Two aspects of the topological string and its applications are considered in this thesis. Firstly, non-perturbative contributions to the OSV conjecture relating four-dimensional extremal black holes and the closed topological string partition function ...
Cook, Paul Langabi Hogan
core +1 more source
, 2017 Drilling deep HPHT wells is the most compelling reason for drilling companies to look for alternative drill pipes that meet their requirements. Currently, with the emergence of drill pipes made of materials other than steel, a thorough study of ...
Bouali, Elahmoun +5 more
core +1 more source
British Educational Research Journal, EarlyView.Abstract Quality in early childhood education and care (ECEC) is a contested concept and has generally been conceptualised by inter‐related indicators such as staff qualifications, educational environment, policy or child‐to‐staff ratios. There has been a more limited emphasis on how young children might perceive and experience quality.
Nikki Fairchild, Éva Mikuska
wiley +1 more source
Fluid Mechanics of the Drilling String [PDF]
Journal of Petroleum Technology, 1953 To help field men select the proper nozzle and pump liner size, a pocket calculator has been designed which will predict the performance of the hydraulic system. Although the use of the drilling fluid to control and condition the hole is well known, the present use of high jet velocities has brought purely hydraulic problems to much ...
openaire +1 more source
British Educational Research Journal, EarlyView.Abstract Cooperative learning is a widely adopted teaching method to improve academic achievement. This review synthesises existing research on the use of cooperative learning within a school setting for pupils aged 11–16 years. Such a review has not been undertaken to date and will present an evidence base for educators considering implementation ...
Patricia Hampson +2 more
wiley +1 more source
MachinesThe swing of the riser in deep-water drilling can significantly impact the drill string. In this study, we establish a riser model that considers the combined disturbance of periodic dynamic wind and wave loads. By coupling it with the drill string model,
Weiguo Hai, Yingming He, Qilong Xue
doaj +1 more source
Shock and Vibration, 2016 Drill string vibrations and shocks (V&S) can limit the optimization of drilling performance, which is a key problem for trajectory optimizing, wellbore design, increasing drill tools life, rate of penetration, and intelligent drilling.
Guangjian Dong, Ping Chen
doaj +1 more source
Bricks, knots, and bodies: Material encounters and the affective making of masculinity
British Educational Research Journal, EarlyView.Abstract This paper examines how creative research methods do not just capture boys' experiences of masculinity, but actively materialise them. Drawing on two arts‐based activities used in school‐based fieldwork (a mannequin‐based exercise with one participant and a Lego‐building workshop with a small peer group), the paper analyses how materials ...
Huw Berry‐Downs
wiley +1 more source