Results 51 to 60 of about 875 (185)
The Use of Aluminum Drill Pipe for Damping Drill String Vibrations [PDF]
, 2018 Drill string vibrations are a significant concern during drilling operations, and are a common cause of downhole tool failures and decreases in drilling efficiency.
Evgeny G. Podnos +4 more
core +1 more source
Analysis on the dynamics of flexible drillstring under different drilling parameters
Frontiers in Earth ScienceDuring the operation of the drill string, it displays a degree of flexibility. Simultaneously, its dynamic properties, influenced by complex stress conditions, manifest nonlinearity and uncertainty.
Jifei Cao +8 more
doaj +1 more source
Qualification of a computer program for drill string dynamics [PDF]
, 1985 A four point plan for the qualification of the GEODYN drill string dynamics computer program is described. The qualification plan investigates both modal response and transient response of a short drill string subjected to simulated cutting loads applied
Carne, T. G. +2 more
core
Petroleum, 2020 The riserless mud recovery (RMR) system abandons the riser used in conventional offshore drilling, and the drill string above the seabed is directly exposed to seawater, resulting in convective heat transfer from the drilling fluid in the drill string to
Xin Li +4 more
doaj +1 more source
Stochastic dynamics of a drill-string with uncertain weight-on-hook [PDF]
Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2010 A drill-string is a slender structure that turns and drills into the rock in search of oil. There are many sources of uncertainties in this complex dynamical system. However, this article is concerned only with uncertainties in the weight-on-hook, which is the supporting force exerted by the hook at the top. A probabilistic model is constructed for the
Ritto, T.G. +2 more
openaire +3 more sources
, 2009 In the oil and gas industry, an underreamer is a tool used to extend and enlarge the diameter of a previously-drilled bore. The problem proposed to the Study Group is to obtain appropriate mathematical models of underreamer dynamics, in forms that will ...
Coskun, Erhan +8 more
core
A complex model of a drilling rig rotor with adjustable electric drive
Записки Горного института, 2023 A modified mathematical model of an asynchronous electric drive of the rotor – a drill string – a bit – a rock is considered and implemented, which develops and generalizes the results of previously performed studies.
Mikhail S. Ershov +2 more
doaj +1 more source
Sensors, 2021 The drill string used in drilling is in a complex motion state downhole for several kilometers. The operating attitude and eccentricity of the downhole drill string play important roles in avoiding downhole risks and correcting the output of the imaging ...
Hongqiang Li, Ruihe Wang
doaj +1 more source
Influence of deformation parameters on drill string dynamics [PDF]
, 2020 Purpose. Identifying the causes of additional energy consumption for deformation of the drill string. Methodology. The study was conducted by analyzing the causes of deformations and justifying their impact on the dynamic parameters of the drill ...
Grydzhuk, Jaroslav, Chudyk, Igor
core
Drill Pipe Dynamic Measurements Provide Valuable Insight Into Drill String Dysfunctions [PDF]
, 2011 Recently the oil and gas drilling industry has become increasingly interested in drilling dynamics and vibration as a cause of reduced drilling performance, downhole tool and drill string failures. Historically, vibration data has been captured by an MWD
Ryan Graham +2 more
core +1 more source