Helical Buckling and Lock-Up Conditions for Coiled Tubing in Curved Wells

He, Xuhui; Kyllingstad, Åge

doi:10.2118/25370-pa

Cited by 87 publications

(37 citation statements)

References 8 publications

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“…He derived an improved formula for critical buckling forces, which takes the well curvature into account. The model predicts that the well curvature substantially affects the critical force for helical buckling [15]. Mitchell presented the large-displacement analysis of a helically buckled slender beam and predicted that shear force and twisting moment are induced in helically buckled pipe without externally applied torque [16].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Analysis of Dynamic Buckling of Drill String in Horizontal Well

Ren

Wang

Zhao

et al. 2017

Shock and Vibration

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Buckling of tubulars has been the subject of many researches in the past. However, the models in previous research always followed the same assumptions: the friction and rotation effects are ignored. The assumptions are relatively far from the reality. This paper focuses on the rotational drill string in horizontal well. The differential equation of the dynamic buckling is established considering some various factors, including friction, the drill string-borehole interaction, and rotation, and the equations of the critical load of the sinusoidal buckling and the spiral buckling are derived. Furthermore, the friction curve of the drill string and the critical load of the dynamic buckling during rotation are obtained. In addition, the influence of the rotational speed on the dynamic buckling and the axis orbit of the dynamic buckling are also gained. The results show that the critical load of the sinusoidal buckling has nothing to do with the rotational speed while the amplitude and the frequency of the dynamic buckling become larger with the increase of the rotational speed, and the dynamic buckling presents a completely different state with the development of the axial load at different speed ranges.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Analysis of Dynamic Buckling of Drill String in Horizontal Well

Ren

Wang

Zhao

et al. 2017

Shock and Vibration

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“…The compressive force required for the string to transition from a sine wave to helix is 41% more than the force necessary for it to initially buckle into a sine wave (9). The force required to reach the locking point in a straight well is always higher than the force required for helical buckling.…”

Section: Model Assumption Validationsmentioning

confidence: 99%

“…Specifically, Eqs. 1 and 2 were derived by He and Kyllingstad to predict the normal contact forces between the drill string and the well wall (9).…”

Section: Analytical Model For Predicting Engagement/disengagement Of mentioning

confidence: 99%

Design of a mechanical clutch-based needle-insertion device

Bassett

Slocum

Masiakos

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

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Insertion of trocars, needles, and catheters into unintended tissues or tissue compartments results in hundreds of thousands of complications annually. Current methods for blood vessel cannulation or epidural, chest tube, and initial trocar placement often involve the blind pass of a needle through several layers of tissue and generally rely on distinguishable anatomic landmarks and a high degree of clinical skill. To address this simply and without the use of electronics, a purely mechanical clutch system was developed for use in medical devices that access tissue and tissue compartments. This clutch utilizes the surface contact of a buckled filament inside an S-shaped tube to transmit force from the filament (catheter/guide wire) to the tube (needle). Upon encountering sufficient resistance at the tip, such as dense tissue, the catheter buckles and locks within the tube, causing the filament and needle to advance as one. When the needle reaches the target tissue or fluid-filled cavity, the filament unlocks and slides freely into the target region while the needle remains stationary. A similar locking phenomenon has long been observed in drill strings inside drill shafts used by the oil-drilling industry, and oil industry models were adapted to describe the motion of this clutch system. A predictive analytical model was generated and validated with empirical data and used to develop prototypes of a complete device then tested in vitro on muscle tissue and in vivo on a porcine laparoscopic model with promising results.catheter ͉ helical-buckling ͉ trocar

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“…μ is the kinematic viscosity of liquid (Pa.s), Dci is the outside diameter of sucker rod coupling (m), Dti is the outside diameter of tube (m), Dri is the element diameter of SRS (m). For the researches on the deformation of helical buckling for SRS, Lubinski, Xiaojun, Mitchell and Guohua give theoretical analysis method and experiment [11][12][13]. And the damping coefficient is derived by Shimin, and the equation is expressed [2].…”

Section: Dynamic Model and Nonlinear Second-order Differential Equationsmentioning

confidence: 99%

“…Therefore, the research on deformation of helical buckling for SRS is reported in Refs. [11][12][13] and need not be repeated here.…”

Section: Dynamic Model and Nonlinear Second-order Differential Equationsmentioning

confidence: 99%

Characteristic Analysis of longitudinal vibration Sucker Rod String With Variable Equivalent Stiffness

Xing

2018

MATEC Web Conf.

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Abstract. Considering the influence of variable equivalent stiffness on system response, the equivalent stiffness is defined as a step function, and a mathematical model of nonlinear longitudinal vibration of sucker rod string (SRS) is built. The dynamic response under displacement and load force excitation is solved by fourth-order Runge-Kutta method with zero initial condition. The results show the steady-state responses under the displacement and load force excitation of different function forms are different. The response curves of both displacement and velocity under the displacement and load force excitation of cosine function form have larger fluctuation than it under the displacement and load force excitation of sine function form. Therefore, the characteristic analysis of SRS plays an important role in understanding the influence of the excitation form and sensitive parameters on steady response. InstructionThe SRS is a slender rod of several kilometres, which transmits the movement from mechanical rotary motion to plunger linear motion [1][2]. And, the characteristic analysis of longitudinal vibration of SRS is very important for the parameters optimization of sucker rod pumping system (SRPS) [3]. Therefore, the dynamic simulation of SRS is studied by domestic and foreign scholars. After wave equation of Gibbs [4], an improved model of SRPS is built by Dale Russel Doty and S.D. . Recently, I.N.Shardakov, Luan Guo-hua and M.M Xing etal [7][8][9] analyse boundary conditions effecting rod law of motion and correct the excitation forces of rod longitudinal vibration. However, the most of aforementioned approaches have not been studied sufficiently. Relevant references [9][10] shows that the equivalent stiffness is a function of time, when the influence of the helical buckling of SRS on the equivalent stiffness is taken into consideration, which affects the characteristic of longitudinal vibration of SRS. Therefore, with non-constant equivalent stiffness, the dynamic Characteristic of SRS with Variable Equivalent Stiffness is necessary to be analysed.In this paper, the dynamic model and nonlinear second-order differential equations are built, and the entire equilibrium equation is given in section 2. In section 3, the system equations of nonlinear longitudinal vibration of SRS are solved by fourth-order Runge-Kutta method with zero intimal conditional. In section 4, the dynamic responses under different function forms of load force excitation as well as the load force and displacement excitation are given, and the effects of different function forms of load force excitation as well as displacement excitation on the amplitude-frequency curves are analysed. In section 5, the significance of dynamic characteristic of SRS and conclusions are summarized. Dynamic model and nonlinear second-order differential equationsIn order to establish mechanical model of nonlinear longitudinal vibration for SRS, the fundamental assumptions are as follows: (1)The tubing string is anchored; (2)The viscous damping of liquid is c...

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Helical Buckling and Lock-Up Conditions for Coiled Tubing in Curved Wells

Cited by 87 publications

References 8 publications

Experimental Investigation and Analysis of Dynamic Buckling of Drill String in Horizontal Well

Experimental Investigation and Analysis of Dynamic Buckling of Drill String in Horizontal Well

Design of a mechanical clutch-based needle-insertion device

Characteristic Analysis of longitudinal vibration Sucker Rod String With Variable Equivalent Stiffness

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