The Study and Application on Rule of Drill String Axial Vibration with Delphi

2009 ◽  
Author(s):  
Han Chunjie ◽  
Yan Tie
Keyword(s):  
Drill String ◽  
Axial Vibration

Study on the mechanism of drilling speed increase considering the axial vibration of drill string

2020 ◽  
Vol 43 (1) ◽  
Author(s):  
Jialin Tian ◽  
Lai Wei ◽  
Liming Dai ◽  
Shadequr Rahaman Emtiaz ◽  
Ariful Islam ◽  
...  
Keyword(s):  
Drill String ◽  
Drilling Speed ◽  
Axial Vibration ◽  
Speed Increase

Arithmetic solution for the axial vibration of drill string coupling with a down-the-hole hammer in rock drilling

2014 ◽  
Vol 22 (13) ◽  
pp. 3090-3101 ◽  
Author(s):  
Changgen Bu ◽  
Xiaofeng Li ◽  
Long Sun ◽  
Boru Xia
Keyword(s):  
Drill String ◽  
Axial Vibration ◽  
Rock Drilling

scholarly journals Effect of Axial Vibration on Sliding Frictional Force between Shale and 45 Steel

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Wu Hao ◽  
Chen Ping ◽  
Liu Yang ◽  
Ma Tianshou
Keyword(s):  
Friction Coefficient ◽  
Friction Force ◽  
Sliding Friction ◽  
Complex Structure ◽  
Drill String ◽  
Friction Reduction ◽  
Vibration Velocity ◽  
Model Parameters ◽  
Axial Vibration ◽  
Friction Reducing

Activating drill string vibration is an effective means to mitigate the excessive drag encountered during drilling complex-structure wells. However, the Coulomb model cannot describe the sliding friction behavior between drill string and borehole rock with imposed axial vibrations. To solve this problem, a specially designed experimental setup was utilized to investigate the characteristics of axial vibrating-sliding coupling friction. The results indicate that when vibration velocity is greater than sliding velocity, axial vibration can significantly reduce friction force between contact surfaces. Its friction reduction mechanism embodies not only the changes of instantaneous friction force, but also friction coefficient. Meanwhile, a friction coupling model was established based on the Hertz contact theory and Dahl model. The corresponding computational program was developed in Matlab/Simulink environment. The calculation results are in good agreement with the experimental results, verifying the validity of the present method. Furthermore, to overcome the shortcoming of Dahl model, a dynamic friction coefficient model was proposed to evaluate the friction-reducing effect of axial vibration using dimensional analysis method. The model parameters under different lubrication conditions were retrieved through inverse calculation with experimental data. This method provides a new solution for evaluating the friction-reducing effect of hydraulic oscillator and optimizing its placement.

A torsional-axial vibration analysis of drill string endowed with kinematic coupling and stochastic approach

2021 ◽  
Vol 198 ◽  
pp. 108157
Author(s):  
Jingkai Chen ◽  
Hualin Liao ◽  
Yanting Zhang ◽  
Hongjun Liang ◽  
Chuanfu Liu ◽  
...  
Keyword(s):  
Vibration Analysis ◽  
Stochastic Approach ◽  
Drill String ◽  
Axial Vibration ◽  
Kinematic Coupling

The optimization of a drill-string bottom assembly for drilling of the well no 741 Kamyshinskaya

2018 ◽  
pp. 14-18
Author(s):  
G.V. Buslaev ◽  
◽  
V.A. Ovchinnikov ◽  
N.A. Rudnitsky ◽  
◽  
...  
Keyword(s):  
Drill String

Stress deformed state of a drill string under off-design conditions

2006 ◽  
Vol 4 ◽  
pp. 68-72
Author(s):  
A.G. Khakimov ◽  
Z.Z Sharafutdinov
Keyword(s):  
Mechanical Characteristics ◽  
Drill String ◽  
Modes Of Operation ◽  
Deformed State

The paper gives a methodology for calculating the drill string performance under off-design conditions, including the passage through the interface separating rocks with very different physico-mechanical characteristics, drilling of boulder rocks, and dynamic modes of operation. One of the mechanisms of the destruction of drill string elements and roller cutters is revealed.

Application of the piecewise constant method in nonlinear dynamics of drill string

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jialin Tian ◽  
Jie Wang ◽  
Yi Zhou ◽  
Lin Yang ◽  
Changyue Fan ◽  
...  
Keyword(s):  
Nonlinear Dynamics ◽  
Dynamic Model ◽  
Dynamic Characteristics ◽  
Drill String ◽  
Vibration Velocity ◽  
Kutta Method ◽  
Time Step ◽  
Piecewise Constant ◽  
Runge Kutta Method ◽  
Runge Kutta

Abstract Aiming at the current development of drilling technology and the deepening of oil and gas exploration, we focus on better studying the nonlinear dynamic characteristics of the drill string under complex working conditions and knowing the real movement of the drill string during drilling. This paper firstly combines the actual situation of the well to establish the dynamic model of the horizontal drill string, and analyzes the dynamic characteristics, giving the expression of the force of each part of the model. Secondly, it introduces the piecewise constant method (simply known as PT method), and gives the solution equation. Then according to the basic parameters, the axial vibration displacement and vibration velocity at the test points are solved by the PT method and the Runge–Kutta method, respectively, and the phase diagram, the Poincare map, and the spectrogram are obtained. The results obtained by the two methods are compared and analyzed. Finally, the relevant experimental tests are carried out. It shows that the results of the dynamic model of the horizontal drill string are basically consistent with the results obtained by the actual test, which verifies the validity of the dynamic model and the correctness of the calculated results. When solving the drill string nonlinear dynamics, the results of the PT method is closer to the theoretical solution than that of the Runge–Kutta method with the same order and time step. And the PT method is better than the Runge–Kutta method with the same order in smoothness and continuity in solving the drill string nonlinear dynamics.

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