Application and effect of buoyancy on sucker rod string dynamics

Lao, Liming; Zhou, Hua

doi:10.1016/j.petrol.2016.04.029

Cited by 24 publications

(17 citation statements)

References 18 publications

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“…In 2016, Xing [14] established a model of the longitudinal vibration and flexural coupling of the sucker-rod pump and calculated its column mechanics by ANSYS software. In 2016, Lao et al [15] establish a lateral force coupling model between buoyancy and the tube in the inclined well, revealing how buoyancy affects the dynamic performance of the sucker-rod. In 2018, Feng et al [16] established a three-dimensional dynamic model of the rod-tube-liquid and analysed the dynamic performance of the sucker-rod pump.…”

Section: Introductionmentioning

confidence: 99%

Dynamic coupling modelling and application case analysis of high-slip motors and pumping units

Feng

Cui

et al. 2020

PLoS ONE

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To solve the issues and difficulties in the high-coupling modelling of beam pumping units and high-slip motors, external characteristic experiments of high-slip motors were performed where the external database and characteristic correlation equations of the motors were obtained through data regression analysis. Based on the analysis of the kinematics, dynamics and driving characteristics of the beam pumping unit, a fully coupled mathematical model of a motor, pumping unit, sucker rod and oil pump was established. The differential pumping equation system of the pumping unit used a cyclic iteration method to solve the problem of high coupling among the motor, pumping unit, sucker rod and the pumping pump. The model was verified by experimental data of field l pumping wells. Theoretical calculations and experimental tests showed that the soft characteristic of the high-slip motor can reduce the peak suspension load of the sucker rod, peak net torque of the gearbox and peak power of the motor. In addition, the results show that the soft characteristic can also decrease the high-frequency fluctuation of the motor power curve and the torque curve of the gearbox. The highslip motor can improve the smoothness and safety of the pumping well system. (2020) Dynamic coupling modelling and application case analysis of high-slip motors and pumping units. PLoS ONE 15(1): e0227827. Where T d -Motor shaft output torque, kN�m; T n -The moment of resistance of the polished rod on the crank, kN�m; P-Suspended load, kN; B-Unbalanced weight of pumping unit structure, kN; J b -Beam moment of inertia, kg�m 2 ; M-Crank balancing torque, kN�m; τ-phasing degree,˚; ξ m -Transmission efficiency of the motor to the crankshaft; m-index, when T d >0, m = 1, when T d <0, m = −1; J p -Motor shaft equivalent moment of inertia, kg�m 2 ; J p0 -Moment of inertia of each component of the drive motor on the motor shaft, kg�m 2 ; J p1 -Moment of inertia of each component of the input shaft of the redactor, kg�m 2 ; J p2 -Moment of inertia of each component of the intermediate shaft of the redactor, kg�m 2 ; J p3 -Moment of inertia of each member of the crankshaft, kg�m 2 ;i-Total gear ratio from the motor output shaft to the gearbox output shaft; i 1 -Total gear ratio of the pumping unit gearbox; i 2 -Pumping gear gearbox low-speed gear ratio. By substituting Eq (25) into Eq (24), the differential equation of crank angular velocity and crank angle is obtained, as shown in Eq (27): Gearbox intermediate shaft 1.29 Gearbox crankshaft 5330

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Section: Introductionmentioning

confidence: 99%

Dynamic coupling modelling and application case analysis of high-slip motors and pumping units

Feng

Cui

et al. 2020

PLoS ONE

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“…The sucker rod pumping has been a common practice in global oil production since it was put forward [Neely and Tolbert (1988)], covering over 85% of the total active well stocks in the USA, and approximately 80% of the oil wells are being produced by the sucker rod pumping in the world [Yu, Shi and Mi (2013)]. In the sucker rod pumping unit system, the sucker rod is a significant part of the power transmission in the oil well [Lao and Zhou (2016)]. It is a very slender and flexible rod, the diameter ranges from 13 mm to 29 mm in six sizes.…”

Section: Introductionmentioning

confidence: 99%

Online Magnetic Flux Leakage Detection System for Sucker Rod Defects Based on LabVIEW Programming

Zhang

Wei

2019

Computers, Materials &Amp; Continua

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Aiming at the detection of the sucker rod defects, a real-time detection system is designed using the non-destructive testing technology of magnetic flux leakage (MFL). An MFL measurement system consists of many parts, and this study focuses on the signal acquisition and processing system. First of all, this paper introduces the hardware part of the acquisition system in detail, including the selection of the Hall-effect sensor, the design of the signal conditioning circuit, and the working process of the single chip computer (SCM) control serial port. Based on LabVIEW, a graphical programming software, the software part of the acquisition system is written, including serial port parameter configuration, detection signal recognition, original signal filtering, real-time display, data storage and playback. Finally, an experimental platform for the MFL detection is set up, and the MFL measurement is carried out on the transverse and longitudinal defects of the sucker rod surface. The experimental result shows that the designed acquisition and processing system has good detection performance, simple design and high flexibility.

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“…In 2016, Lao and Zhou [25] developed a method that directly calculates the fluid force acting on the curved cylindrical surface of the rod element. They used the pump dynamometer cards as a boundary condition and solved wave equations for sucker-rod pumping more accurately than was previously possible.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Model and Analysis of a Sucker-rod Pump Injection-production System

et al. 2019

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Injection and production at the same oil well is an effective way to achieve stable production and control water-cut. A sucker-rod pump injection-production system is composed of a production pump, piston seal, injection pump, and so on. It separates oil and water down the well hole using gravity, then injects the water directly into the formation while the concentrated oil is brought to the surface. To explore the complex forces involved in the system, static and dynamic models of the injection pump, sealed piston and production pump are established from the bottom up based on the mechanical method, and a solution is established using the difference method. Finally, a dynamic simulation of the system is compiled in Visual Basic V6.0, and the correctness and practicality of the simulation are verified by field measurements.

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Application and effect of buoyancy on sucker rod string dynamics

Cited by 24 publications

References 18 publications

Dynamic coupling modelling and application case analysis of high-slip motors and pumping units

Dynamic coupling modelling and application case analysis of high-slip motors and pumping units

Online Magnetic Flux Leakage Detection System for Sucker Rod Defects Based on LabVIEW Programming

Dynamic Model and Analysis of a Sucker-rod Pump Injection-production System

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