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Vibration Analysis of a drillstring in Horizontal Well

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Computer Modeling in Engineering & Sciences 2019年第11期121卷 631-660页

作者： Xiaohua Zhu Li Zeng Bo Li School of Mechanical Engineering Southwest Petroleum University ChengduChengdu610500China

The complicated geological conditions will bring great challenges to the drillstring of horizontal wells for the reason that the increase of the well depth in Sichuan-Chongqing *** drillstring failure and friction during drilling are generally caused by drillstring vibration,great importance must be attached to computer simulation methods for the prediction of drillstring vibration.A finite element model considering axial,lateral and torsional vibration is *** order to verify the established numerical model,an indoor experimental device based on the similarity principle was *** vibration characteristics of three shale gas horizontal wells drillstrings are *** reasons for the large difference in vibration characteristics between the three wells were discussed by changing the well structure,BHA(bottom hole assembly)and drilling *** simulation results show that the depth of ultra-deep well 3 is only 1.27 times of that of medium-deep well 2,but the fluctuation of WOB(weight on bit)is 2.8 *** primary factor for the great difference of WOB fluctuation is the change of vertical section depth,the secondary factor is the change of the horizontal section ***,the reasonable range of speeds has been proposed and applied in the *** advantage of this numerical analysis method is that it can judge the vibration and friction torque of drillstring in horizontal wells with arbitrary structure,drilling parameters and *** method has certain guiding significance to the field practice.

关键词： Horizontal well drillstring vibration friction torque fatigue life

Application of gap element to nonlinear mechanics analysis of drillstring

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Journal of Zhejiang University Science 2002年第4期3卷 440-444页

作者：刘巨保丁皓江张学鸿 DepartmentofCivilEngineering ZhejiangUniversity Hangzhou310027China DepartmentofPetroleumMechanicalEngineering DaqingPetroleumInstituteAnda151400China

This paper presents a nonlinear finite element method to resolve the problem of the nonlinear contact between the drillstring and hole wall by using a Multi-directional Contact Gap Element (MCGE) contacting at appropriate positions in each beam element. The method was successfully applied to the Daqing Oil Field GP1 well. It was shown that the drillstring's contact resistance at any well depth could be obtained by calculations and that as the error in the calculation of the hole top load is below 10%, the calculation result can provide theoretical basis for the design and operation of drillstrings.

关键词： drillstring Contact non-line Finite element Horizontal well

On the formation of limit cycle of the friction-induced stick-slip vibration in oilwell drillstring

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Petroleum 2015年第1期1卷 63-67页

作者： Xiaohua Zhu Liping Tang School of Mechatronic Engineering Southwest Petroleum UniversityChengdu 610500China

In this paper,the stick-slip vibration in oilwell drillstring is *** drilling system is modelled as a lumped-parameter torsional pendulum and the interaction between the drill bit and the rock is treated as Coulomb *** of motion of the drill bit is established and the dynamic responses of the drill bit are obtained.A drilling system with the drillstring length 3000 m is analysed,in which the system parameters are selected by reference to the actual drilling *** the slip vibrations in the initial stage,final state of the drill bit is a stable stick-slip vibration of which the limit cycle is a closed *** order to find the stability of the limit cycle corresponds to the periodically stick-slip vibration,different initial conditions for the drill bit are *** show that the drill bit will lead to a periodic motion and the phase trajectories ultimately converge to the same limit cycle corresponds to stable stick-slip vibration.

关键词： Stick-slip vibration Friction drillstring Drill bit Limit cycle

Application of gap element to nonlinear mechanics analysis of drillstring

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2002年第4期3卷 61-65页

作者：刘巨保丁皓江张学鸿 Department of Civil Engineering Zhejiang University Hangzhou China Department of Petroleum Mechanical Engineering Daqing Petroleum Institute Ando China

This paper presents a nonlinear finite element method to resolve the problem of the nonlinear contact between the drillstring and hole wall by using a Multi-directional Contact Gap Element (MCGE) contacting at appropriate positions in each beam element. The method was successfully applied to the Daqing Oil Field GP1 well. It was shown that the drillstring’s contact resistance at any well depth could be obtained by calculations and that as the error in the calculation of the hole top load is below 10%, the calculation result can provide theoretical basis for the design and operation of drillstrings.

关键词： drillstring Contact non-line Finite element Horizontal well

PROGRESS IN SHOCK VIBRATION MECHANISM OF COUPLING DTH-HAMMER WITH drillstring

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PROGRESS IN SHOCK VIBRATION MECHANISM OF COUPLING DTH-HAMMER...

Investigation into the effect of friction decay factor on the modelling and attenuation of stick-slip vibrations of oilwell drilling systems

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作者： Bu Changgen Liu Baolin Ye Juan Qu Yegao and Zhang Rong School of Engineering and Technology China University of Geoscicnces Beijing

＜正＞Owing to the advantages of high efficiency, low consumption and safety, the pneumatic down-the-hole hammer （DTH） is widely used in the realm of water well drilling, mining, etc. The researches on dynamic study of the DTH drilling system are relatively little. The status of the theoretical researches and experiments on long drillstring in oil field were reviewed in present paper. According to the characteristics of the coupling system of DTH and short drillstring, the coupling system of DTH drilling has been modeled and simulated. Taken account of the boundary conditions for different diameter and length drillstring, the vibration mode was analyzed by using ANSYS software. The effects of the boundary and well-hole depth on the natural frequency of drillstring are studied. The transient impact multi-body of the coupling system of DTH drilling was simulated in ADAMS with the three-dimensional model imported from software PRO/E. The proposed method is hopeful to identify the vibration form such as forced vibration and resonant vibration of DTH drilling in different working conditions.

关键词： DTH hammer drillstring Mode analysis FEM

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Petroleum 2022年第3期8卷 344-351页

作者： Mohammed Y.A.Alkaragoolee David Bryant Technical Institute Baqubah Middle Technical UniversityIraq Faculty of Engineering&Informatics University of BradfordUK

The self-excited stick-slip oscillations of oilwell drillstrings are attributed to the nonlinear interaction between the drill-bit and the rock *** of more accurate models will lead to improved predictions allowing more potential for successful suppression of the drillstring vibrations,thus reducing damage to the drilling system,prevention of expensive failures and increased output from the *** this paper,the effect of the transition from static friction to Coulomb friction on modelling of stick-slip phenomenon of oil well drill string is investigated through an analysis of the so called‘decay factor’.Based on a distributed-lumped parameter model(DLPM)of the drilling system,the governing equations of motion for the system are *** using different values of decay factor(low,high and medium),the stick-slip vibrations of the drill string are validated against published data from full-scale drill *** results from the simulation show that lowering the decay factor increases the critical speed and thus reduces the propensity for stick slip ***,a reduction in the decay factor also has the effect of inducing worse stick-slip motion once the critical speed has been *** results indicate the wider impact of both correct modelling of the decay factor,but also the importance of correct characterisation of the mud viscosity and drill/well contact for more accurate selection of drilling parameters in the field.

关键词： Stribeck effect Stick-slip vibration drillstring Distributed-lumped parameters model

Study of the influences of rotary table speed on stick-slip vibration of the drilling system

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Petroleum 2015年第4期1卷 382-387页

作者： Liping Tang Xiaohua Zhu Changshuai Shi Jian Tang Daping Xu School of Mechatronic Engineering Southwest Petroleum UniversityChengdu 610500China Department of Gas Tarim Oilfield CompanyKorlaXinjiang 841000China School of Mechanical Engineering Sichuan University of Science and EngineeringZigongSichuan 643000China

Stick-slip vibration presents one of the major causes of drilling problems,such as premature tool failures,low drilling efficiency and poor wellbore *** objective of this work is to investigate the influences of rotary table speed(RTS)on stick-slip phenomenon of the drilling *** this study,the drilling system is treated as a lumped torsional pendulum model of which the bit/rock interaction is regarded as Coulomb *** analyzing cases with different RTS,two types of vibrations on the bit are found:stick-slip vibration and uniform *** an increase in the RTS,the stick-slip vibration on the drill bit disappears once the RTS arrives at its critical *** the cases that stick-slip vibrations occur,the phase trajectories converge toward a limit *** the cases that stick-slip vibration does not appear,the drill bit tends to stabilize at a uniform motion and the phase trajectories correspond to contracting spirals observed in the phase plane.

关键词： Stick-slip vibration Rotary table speed drillstring Drill bit Frictional torque Limit cycle