Results 71 to 80 of about 875 (185)
Reaming While Drilling Drillstring Structure Optimization and Application Performance Evaluation
Shiyou jixie, 2016 The reaming tool BHA is the most important controllable factor during reaming while drilling operations,whereas the irrational drill string structure could lead to intensified drill string vibration.In view of this,the drill string-formation finite ...
Zhang Qiang, Fu Jianhong, Li Haoran
doaj
EFFECT OF PDC BIT WEAR AND OPERATING PARAMETERS ON OIL-WELL DRILL-STRING DYNAMICS [PDF]
, 2015 Drill-string vibrations reduces the drilling performance, the bit wear negative effects on the drill-string dynamics is one of the elements which limit reaching the optimum drilling performance due to vibrations caused by the bit wear and other factors ...
Yousef Hussein, Hamza Tayseer
core
Improved stiff string torque and drag prediction using a computationally efficient contact algorithm
Mathematical and Computer Modelling of Dynamical SystemsDue to the intermittent contact with the wellbore, determining torque and drag for deviated wells is difficult. Most models have ignored drill string stiffness and assumed continual contact to simplify derivation.
Sampath Liyanarachchi, Geoff Rideout
doaj +1 more source
Influences of Excitation Force Forms of the Hydraulic Oscillator on Drag Reduction Efficiency
Shiyou jixie, 2023 The excitation force forms of the hydraulic oscillator have been rarely reported.Considering the nonlinear effect of frictional forces, a dynamics model of the drill string equipped with the hydraulic oscillator was built by introducing the initial ...
Shi Xiaolei, Huang Wenjun, Gao Deli
doaj
Study on Fatigue Life of BHA based on Drill String Dynamics
Shiyou jixie, 2022 The bottom hole assembly(BHA)is prone to fatigue failure due to long-term severe vibration in the wellbore.Most studies use the differential equation to calculate the fatigue life of BHA,which has a large difference from the actual working conditions on ...
Mao Liangjie +3 more
doaj
Energy Exploration & ExploitationOpen hole drilling is expected to become the mainstream technology for ultra-deepwater applications. During ultra-deepwater drilling, the drill string is influenced by oceanic wind, waves, and currents, resulting in highly complex mechanical behavior. The selection of operating sea conditions and parameters is constrained, posing significant challenges
Fangfei Huang +4 more
openaire +2 more sources
Analysis of friction-induced limit cycling in an experimental drill-string system [PDF]
, 2004 In this paper, we aim for an improved understanding of the causes for torsional vibrations that appear in rotary drilling systems used for the exploration of oil and gas. For this purpose, an experimental drill-string setup is considered. In that system,
Wouw, van de, N. +3 more
core +1 more source
Shiyou jixie, 2021 The stick-slip vibration of the horizontal well drill string system seriously threatens the safety of downhole drill strings and tools, reduces the drilling efficiency of the horizontal section, making the drill bit fail prematurely.
Zhu Jieran +5 more
doaj
Effects of axial impact load on the dynamics of an oilwell drillstring
Advances in Mechanical Engineering, 2019 This article studies the dynamics of oilwell drillstring under large and small axial impact loads. For the case of large impact load, the drillstring is regarded as a continuous bar under the impact load of a falling mass, and the energy conservation ...
Liping Tang, Xiaohua Zhu, Hongzhi Lin
doaj +1 more source
Stability Analysis of the Rotary Drill-String [PDF]
, 2014 Oil and natural gas are major energy sources for modern society. A rotary drilling system is the best known technology to extract them from underground.
Pan, Liangming
core +1 more source