Results 81 to 90 of about 1,167 (156)

Research on the Influence of Deep-Water Drilling Risers on Drillstring Motion Trajectory and Vibration Characteristics

Machines
The 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

Axial Vibration Analysis on Drillstring [PDF]

, 2015
The problem of drill string vibration occurs in drilling operations and it will affect the usage life of drill pipe and drill bits. Three types of vibration, which are axial, lateral and torsional vibrations exist in the drill string.
HOW, KEK JIA
core  

Source Radiation Patterns In Cased Boreholes [PDF]

, 1997
Source radiation from open and cased boreholes are well documented. The effect of an unbonded casing on the radiation patterns of volume, radial stress and axial stress sources in a borehole has received less attention and is modeled and analyzed here ...
Nafi, M. Toksoz, Rao, Rama V.N., Turpening, Roger M.   +2 more
core  

Dynamic Analysis of Stick-Slip and Bit Bounce in Oilwell Drillstring [PDF]

, 2016
Drilling process consisting of drag bits which are used over drilling boreholes concerning generation along with research about oil and gas regularly undergo against caustic vibrations.
A/L ELIYATHAMBY, DHANARAJ
core  

Research on Stick-slip Vibration Level Estimation of Drillstring Based on SVM

Shiyou jixie, 2019
To evaluate the severity of stick-slip vibration of drill string, a risk assessment method based on factor analysis (FA) and support vector machine (SVM) is proposed.
Chen Chong, Zhang Shimin, Peng He, Cui Can, Liu Yang   +4 more
doaj  

Hybrid Modelling and Optimisation of Oil Well Drillstrings [PDF]

, 2018
The failure of oil well drillstrings due to torsional and longitudinal stresses caused by stick-slip phenomena during the drilling operation causes great expense to industry.
Alkaragoolee, Mohammed Y.A.
core  

Drillstring Dynamics - Comparative analysis between a lumped element model s ability to recreate axial vibrations observed from measurements of dynamic strain using small-scale drillstring model [PDF]

, 2016
Lumped element models are desirable for their mathematical simplicity and their practical application for simulating axial vibrations. These models however only approximate the dynamic behavior, and is why real time measurements are essential for ...
Løklingholm, Thomas
core  

Fuzzy Adaptive PID Controller for Stick-Slip Vibration of Drillstring

Shiyou jixie
The destructive stick-slip vibration of the drillstring in deep drilling will cause serious obstacles to well drilling and production， and has always been a challenge without appropriate solution due to its strong nonlinearity and uncertainties.
Luo Jie Liu Jun Zhou Xinzhong Li Qiang Zhang Yi
doaj  

Study of Stick-slip torsional vibration in Drilling Operation [PDF]

, 2008
The purpose of this work is to analyze drill string torsional vibrations modes, and to advise on whether it is best to minimize, if not entirely eliminate these vibration or if they can be utilize to the benefit of the drilling performances.
Arob Deng Chol, Michael
core   +1 more source

Study on lateral vibration of rotary steerable drilling system [PDF]

, 2014
Drillstring vibration is a widely studied topic. Lateral vibration was considered the main reason that caused the fatigue failure of the bottom hole assembly.
Sun, Feng, Wang, Ruihe, Xue, Qilong
core