Influence of Absorber’s Stiffness and Installation Site on Bit Trajectory

Abstract:

A model of drillstring system dynamics was derived based on the drillstring’s Dynamics Equation, System Dynamics Theory and the optimization of absorber’s stiffness and installation site. A numerical calculation approach for solving drillstring system and bit movement was presented according to the drilling parameters. And this paper employed the simulation calculations to analyze and optimize absorber’s stiffness and installation site on different conditions. The results show that the absorber’s stiffness has significant impact on the movement frequencies of bit in the fourth quadrant when the bit next to the borehole wall drills ahead, and absorber has preferable ability of controlling deflection under stiffness for 3950kN/m and 6200kN/m; while the installation site of absorber has acute influence on the bit movement in the first quadrant, the third quadrant and the fourth quadrant, and the optimum position of the absorber is 0.6m distant from the bit. Parameters of absorber’s stiffness and installation site recommended in this study could improve the effectiveness of penetration and are good for controlling deflection and well path.

• Periodical: Applied Mechanics and Materials (Volumes 50-51)
• Pages: 838-842
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.50-51.838
• Online since: February 2011
• Authors: Xiao Hua Zhu, Y.J. Jia, Jin He Li
• Keywords: Absorber, Drillstring Vibration, Installation Site, Stiffness, Well Path

References

[1] Arrestad T V, Kyllingstad A: An Experimental and Theoretical Study of Coupled Boundary Conditions for Vibrations in Drillings. SPE 15563.

[2] Z.Y. Wang, M.T. Xu. Computing Forced Longitudinal Vibration of Drill String by Generalized Transfer Matrix Method [J]. Acta Petrolei Sinica, 11(3): 107~113(1990).

[3] Z.F. Li. Analysis of Longitudinal and Torsion Vibration of Drillstring[J]. Engineering Mechanicas, 21(6): 203~210(2004).

[4] J.B. Liu. Calculation of The Optimal Placement location of Vibration Damper for Deep Hole Drill String [J]. NATURAL GAS INDUSTRY, 17(5): 44~48(1997).

[5] Z.Z. Xie. Elastic Wave in a Drill-pipe String [J]. Acta Petrolei Sinica, 13(3): 94~101(1992).

[6] Z.J. Cui. Analysis of Dynamic Characteristic of An Absorber with Considering The Influence of Upper Tubular Column Deformation [J]. Journal Of Huazhong University Of Science And Technology. Nature Science, 36(9): 106~108(2008).

[7] X.H. Zhu, Q.Y. Liu, H. Tong. Research on Dynamics Model of Full Hole Drill-string System with Three-dimensional Trajectory [J]. Acta Petrolei Sinica, 29(2): 288~291(2008).

[8] Y.C. Kuang, D.K. Ma, Q.Y. Liu. Computer Simulation on Dynamic Action of Drillstring-Bit-Rock System [J]. Acat Petrolei Sinica, 22(3): 81~85(2001).

[9] Dykstra Mark W. Nonlinear Drill String Dynamics. Ph．D．Dissertation, the University of Tulsa, (1996).

[10] C.C. Zhu, D.H. Feng, B. Lu. Nonlineaer Study on Dynamic Action of Integrated Drill String-well Rock System [J]. Journal Of Mechanical Engineering, 43(5): 145~149(2007, ).

DOI: 10.3901/jme.2007.05.145

[11] J.L. Yao. Dynamic Characteristics and Fsilure Mechanism of Drill String in Straight Hole with Air Drilling [J]. Journal Of China University Of Petroleum. Nature Science, 2008, 32(3): 63~67(2008).

[12] X.H. Zhu, Qingyou Liu, Hua Tong. Emulation Research on Dynamics of Roller Cone Bit[J]. Acta Petrolei Sinica, 25(4): 96~100(2004).

[13] Y.S. Jiao, Z.X. Cai, Zongda Yan. Chaotic Motion of a Drillstring in Vertical Section [J]. Journal Of Vibration Engineering, 13(2): 314~318(2000).

[14] X.Z. Yan. Contact-impact Dynamic Simulation of Drillstring and Formation Based on Lagrangial Element Method [J]. Journal Of Mechanical Strength, 28(3): 341~345(2006).

[15] G. H. Zhao, Z. Liang. Analysis Of Collision Between Drillstring And Well Sidewall. International Journal Of Modern Physics B. Vol. 22, Nos. 31 & 32 (2008) 5459~5464.

DOI: 10.1142/s0217979208050656