Research Concerning the Identification of Some Parameters of a Sucker Rod Pumping Unit

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In the kinetostatic study of the mechanism of the sucker rod pumping units, the cinematic motion parameters of the elements are considered to be known, assuming that the cranks have a constant angular velocity imposed by the operating functioning conditions of the pumping unit. The paper analyzes the dynamic response of the mechanism of these pumping units, which implies the determination of the variation of the angular acceleration of the cranks during the operating cinematic cycle. A series of results regarding the determination of the variation of the angular acceleration of the cranks during the cinematic cycle in the case of the mechanism of a C-640D-305-120 pumping unit are presented. The obtained results are checked by comparing the experimental curves of variations of the acceleration at the polished rod with those obtained by simulation using a computer program developed by the authors in which the angular acceleration of the cranks was taken into consideration. Keywords: sucker rod pumping unit, dynamic response, angular acceleration of the cranksEstablishing the variation of the angular acceleration of the cranks of the conventional sucker rod pumping units, which implies the determination of their dynamic response, is particularly important in assessing the operation of the entire pumping installation [1][2][3]. Obtaining high values of the angular acceleration of the cranks would reveal inadequate operation of the pumping unit, due to a poor balancing of the unit mechanism or due to the dynamics of the sucker rod string [4][5][6][7].The paper presents the way to determine the variation on the cinematic cycle of the acceleration of the cranks of the conventional pumping units by using the synthesis parameters of the dynamic model of their mechanism. The results obtained in the case of a C-640D-305-120 pumping unit were verified by comparing the experimental curves of the variation of the acceleration of the polished rod with those obtained by simulation using a computer program developed by the authors in which the angular acceleration of the cranks was taken into consideration. Total Well Management program [11] has been used for processing the experimental records and the computer program for simulations was developed with Maple programming environment [10]. Experimental partThe experimental records have been obtained from a well serviced by a C-640D-305-120 pumping unit manufactured by Lufkin [12] and were processed with the program Total Well Management [11]. For establishing the variation of the angular acceleration of the cranks were used the records concerning the variation of the force at the polished rod and of the motor moment at the crankshaft for the strokes 90 ( fig. 1) and 95 (fig. 2). *

Section: Abstract: Sucker Rod Pumping Unit Dynamic Response Angularmentioning

confidence: 99%

Analysis of the Dynamic Response of the Mechanism of Conventional Sucker rod Pumping Units

Badoiu¹,

Toma²

2020

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“…5. The mechanism of the conventional pumping units By rewriting the system of equations (2) into the form: (3) and by squaring the two equations from (3) and then summing them, it results the following equation from which can be calculated the angle ϕ 3 : (4) where: (5) The acceleration a D at the end of the polished rod can be established by deriving with respect to time the speed ν D by taking into account the equation (1): (6)…”

Section: Experimental Partmentioning

confidence: 99%

“…The information from some of these transducers gives an overview of the operation of the pumping system, such as: the variation of the motor power, the variation of the gearbox torque and the variation of the instantaneous rotation speed of the cranks shaft, while other transducers provides information concerning the kinematics and the dynamics of the sucker rod column (for example: the variation of the position, speed and acceleration of the polished rod and the surface dynagraph) and the functioning of the depth pump, such as: the variation of the plunger position and of the instantaneous pump displacement. The correlations between the data acquired by these transducers are particularly useful for development or verification of different models concerning the kinematics and the dynamics of the pumping installations [4,5].…”

mentioning

confidence: 99%

Research Concerning the Correlations Between Some Experimental Results in the Case of a Sucker Rod Pumping Installation

Badoiu¹,

Toma²

2018

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In the paper are analyzed the correlations between the experimental results obtained for the instantaneous rotation speed of the cranks shaft of a conventional sucker rod pumping installation and the speed and the acceleration at the end of the polished rod. The correlations have been established by analyzing the kinematics of the mechanism of the sucker rod pumping unit. The experimental records have been processed with the program Total Well Management. A computer program for performing the simulations has been developed by the authors using Maple programming environment.

“…The analysis of the conventional pumping installations in order to improve their operation requires the completion of complex studies both on the level of the sucker rods pumping column and also concerning the surface equipment, especially the pumping unit mechanism [1][2][3][4][5][6][7][8]. Regarding the mechanism of the pumping units, from the perspective of their dynamics, the study of the movement equation is extremely important for highlighting the dynamic response to the motor and resistant actions on the component elements [9][10].…”

mentioning

confidence: 99%

Research Concerning the Movement Equation of the Mechanism of the Conventional Sucker Rod Pumping Units

Badoiu¹

2019

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Establishing and then solving the movement equation of the mechanism of the conventional sucker rod pumping units allows determining the variation on the cinematic cycle of the angular speed of the cranks as a dynamic response to the motor and resistant actions on the component elements. The evaluation as accurate as possible of the dynamic response depends on a more precise determination of the variation on the cinematic cycle of the synthesis parameters that occur in the movement equation of the mechanism of the pumping units. In the paper is established the movement equation of the mechanism of the conventional pumping units and are presented a series of results regarding the variation on the cinematic cycle of some synthesis parameters in the case of the mechanism of a C-640D-305-120 pumping unit. Experimental records have been processed with the Total Well Management program and the simulations have been performed with a computer program developed by the author using the Maple programming environment.