The Experts below are selected from a list of 753 Experts worldwide ranked by ideXlab platform
Zhao Hai-yang - One of the best experts on this subject based on the ideXlab platform.
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Balance Adjustment of Sucker-Rod Pumping System with Load Reducer
Oil Field Equipment, 2012Co-Authors: Zhao Hai-yangAbstract:Load reducer is a subsurface tool in the oil well.The load reducer can reduce sucker Rod stress and Polished Rod load of pumping unit horse head by hydraulic pressure.The power characteristics and the balance of sucker-Rod pumping system were changed with the reduced force pRoduced by the load reducer.According to the system motion law and the balance principle,the pumping system and the counter weight was analyzed with theory.The theoretical calculation combining with the actual working condition,the system balance was adjusted by the result of numerical analysis again.As a result,the energy consumption of Rod pumping system is reduced,the pRoduction cost is saved and the economic efficiency is improved.
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A prediction model for a new deep-Rod pumping system
Journal of Petroleum Science and Engineering, 2011Co-Authors: Luan Guo-hua, He Shun-li, Yang Zhi, Zhao Hai-yang, Hu Jing-hong, Xie Quan, Shen Ying-haoAbstract:Abstract The side-flow pump is presented for increasing the setting depth of sucker Rod pumping system, which adopts a special structure of side-flow valve, ladder-type solid plunger and breathing hole. By transferring the load of liquid column to the tubing on the upstroke, the new pump achieves a smaller Polished Rod load. On the basis of in-depth study of the pump, this paper provides a brief formula of the static Polished Rod load. Assuming the tubing is anchored, a new one-dimensional vibration model of sucker Rod pumping system is built, which takes into account the structure of the side-flow pump. Then a mathematical model is used to design the sucker Rod pumping system of Well TKN-1, with a setting depth of 4716 m. The results of dynamometer analysis show that mathematical model of side-flow pumping system and its computer programs can successfully model deep Rod string performance. The Rod pumping system of Well TKN-1 has operated trouble-free for 8 months. The knowledge gained gives confidence for additional future applications.
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Numerical Analysis and Application of Sucker-Rod Pumping System with Load Reducer
Oil Field Equipment, 2010Co-Authors: Zhao Hai-yangAbstract:The tubing string configuration of sucker-Rod pumping system with load reducer is intRoduced.The load reducer can reduce sucker Rod stress and Polished Rod load of pumping unit horse head by hydraulic pressure.According to the motion law and the state of loading,the motion process of sucker-Rod pumping system is simulated with the Finite Element Method.The dynamic characteristic of sucker-Rod pumping system is describes accurately.The simulation result is consonant with actual working condition.The numerical analysis makes the combination of sucker Rod more reasonable.The Polished Rod load is reduced.The pRoduction cost is economized further.
Hongzhao Liu - One of the best experts on this subject based on the ideXlab platform.
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Prediction and Analysis of Polished Rod Dynamometer Card in Sucker Rod Pumping System with Wear
Hindawi Limited, 2018Co-Authors: Dongyu Wang, Hongzhao LiuAbstract:In the oil pRoduction process, the wear of friction pairs in sucker Rod pumping installations will increase over time, which leads to the failure of the sucker Rod pumping system. In order to study the effect of wear on the sucker Rod pumping system, a wear model between the plunger and pump barrel was established. By analyzing the wear law, the wear volume and wear time of the pump barrel were calculated under abrasive wear. The forces of the sucker Rod microunit were analyzed, and the wave equation of the sucker Rod was established. Based on the given boundary and initial conditions, a mixed difference method was used to solve the equation. Taking the no. L2111 well of an oilfield as an example, the change curves of the wear volume and wear time with abrasive particle diameter were plotted, and the Polished Rod dynamometer card considering wear was predicted. The results showed that the increased clearance caused by wear will reduce the Polished Rod load on upstroke of the sucker Rod pumping system, which could provide a theoretical basis for the next fault diagnosis
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Dynamic Modeling and Analysis of Sucker Rod Pumping System in a Directional Well
Lecture Notes in Electrical Engineering, 2016Co-Authors: Dongyu Wang, Hongzhao LiuAbstract:The sucker Rod dynamic model including the influences of Rod-fluid-tubing viscous friction and Rod-tubing Coulomb friction is developed. Considering the influences of the liquid inertia and plunger-barrel friction, downhole boundary conditions are determined. To improve the velocity and preciseness of simulation and prediction, a hybrid algorithm is proposed for solving the wave equation. This algorithm combines the implicit differential method applied in homogeneous sucker Rod with the variable step differential method applied in the boundary node of composite sucker Rod. Based on the model and the algorithm, the computer programs predicting the Polished Rod dynamometer card of sucker Rod pumping system in a directional well are written. The results of simulation and prediction show that the modeling method is effective and the reliability of the model is verified. The model can provide a reference for pumping well fault diagnosis.
Liu Chun-hua - One of the best experts on this subject based on the ideXlab platform.
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Design calculation of sucker Rod pumps in coalbed methane wells
Journal of China Coal Society, 2010Co-Authors: Liu Chun-huaAbstract:Based on the kinematic and dynamic analysis of the pumping system,the kinematic relation of Polished Rod was analyzed,the variation of the total loads of Polished Rod and mathematical models of calculating gear torques were developed by applying the method.The results show that the cranks should rotate in the direction of counter clock wise to decrease the maximum Polished-Rod acceleration on the upstroke.The computation of Polished Rod loads should consider the static loads,as well as dynamic and friction loads.Compared with conventional oil and gas fields,the dynamic and friction to Polished Rod load ratios are calculated to be 15% and 6%,respectively.The dynamic load ratio decreases rapidly during the pRoduction,and the ratio is within 4% during steady flow pRoduction,while the friction load ratio becomes larger than it.Besides,the total deformation of Rod and tubing is small in CBM wells and its maximum value is just 17.6 cm,and the static deformation is large while the dynamic one is relatively small in the total deformation.Balance torque loadings on a pumping unit gearbox during the upstroke equal to those during the downstroke,and these two loadings are just half of non-balance torque loadings.
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Development of Polished Rod sealing device for oil pRoduction at wellhead
Inner Mongolia Petrochemical Industry, 2009Co-Authors: Liu Chun-huaAbstract:It was analyzed that structure,working principle and existing defects in oil field of three conventional Polished Rod sealing devices.In consideration of the disadvantages of conventional Polished Rod sealing devices and the status that the devices used to fail in service,a new Polished Rod sealing device is developed.The sealing device adopts ordinary transmission belts of V shape as its sealing stuffing,which makes low cost and perfect performance.Stuffing box is designed to store stuffing.Sealing stuffing are spiral wound to Polished Rod in order to be convenient to remove and install them and be able to change the stuffing without stopping well's pRoduction.Blowout-prevention mechanism is simple and reliable.Adjustable-deviation and inclination mechanism is used to regulate the angle of the sealing device.The field tests show that the sealing device has the advantages of convenient use,reliable performance,and perfect effect of sealing.It has wide prospects of application.
Xinfu Liu - One of the best experts on this subject based on the ideXlab platform.
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Development of Prime Mover Loading on the Sucker Rod Lift During Coalbed Methane PRoduction
Iranian Journal of Science and Technology-Transactions of Mechanical Engineering, 2018Co-Authors: Xinfu LiuAbstract:A modern methodology has been proposed for the system design of prime mover loading in order to reduce the motor size and improve the efficiency of pumping system. Polished Rod loading, plunger stroke length, gearbox torque loading and motor power are chosen as the basic design variables to implement the process of design calculation in pRoducing coalbed methane (CBM) wells. Based on the kinematic and dynamic analysis of sucker Rod pumping mechanism, the kinematic relations of Polished Rod loading are developed with the limits of specific CBM well conditions along Rod string. The gearbox torque is determined by combining the counterbalance effect with the calculated dynamometer cards and torque factors. Then the design of prime mover is computed by combining the pumping speed with motor and drive efficiencies. The application characteristics of this method are demonstrated by the example of pRoducing CBM wells in Ordos Basin. The interpretations of results show that compared with oil/gas fields, the load ratios of dynamic and friction to the total loads are relatively high and the computation of Polished Rod loads should involve the static loads as well as the dynamic and friction loads. The net gearbox torque is cyclic loading for the balanced operation. And the extreme value of net gearbox torque occurring on the upstroke is approximately equal to that on the downstroke. The maximum value of net gearbox torque is less than 50% of the peak value of unbalanced gearbox loadings. Moreover, the variation of instantaneous motor power versus crank angle is consistent with that of gearbox torque versus crank angle. The negative motor power results from the combination of the various moving components which drive the motor, exceed its synchronous speed and make the prime mover operate in a “regenerative power” mode. The value range of negative motor power is much smaller than that of unbalanced gearbox loadings. The result of this work is a mathematical model and a complex computer program used for the design calculation of prime mover loading in pRoducing CBM wells. This makes it possible to maintain the gearbox torque in balance, load the prime mover more uniformly and provide a reasonable basis for the selection of pumping units.
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A modern approach to the selection of sucker Rod pumping systems in CBM wells
Journal of Petroleum Science and Engineering, 2011Co-Authors: Xinfu LiuAbstract:A modern methodology is presented for the selection of sucker Rod pumping systems in CBM wells. Based on the IPR techniques and fluid flow characteristics in CBM reservoirs, CBM well performance is analyzed to couple the pumping unit performance and CBM pRoduction capacity. Then pRoduction rates can be reasonably estimated for a given set of conditions. Size of pumping unit, plunger size, Polished Rod stroke length, pumping speed and Rod string taper are chosen as the basic design variables that characterize the pumping system. Each of these variables will influence the efficiency of the system. Water pRoduction rate and pump setting depth are the most important factors while developing the optimization criterion. And the pump setting depth for a desired size of pumping unit is determined for any pRoduction rate by an iteration algorithm which systematically incorporates the kinematic analysis, CBM well inflow performance and vertical flow effects into the selection process. The loads of Polished Rod and Rod string tapers are also determined by the iteration calculation. An optimization objective function is set up to rate the available pumping modes and it is programmed as a function of the design variables and operational parameters. Then the optimization criterion is proposed to select the appropriate pumping mode from a large number of combinations of pumping system parameters. The criterion is given by its capacity to allow the maximum water pRoduction rate, maximum and minimum Polished-Rod load and gear peak torque under maximum pump setting depth not out of the ratings. And this makes the selection of an appropriate sucker Rod pumping system within the limitations of available equipment by a mathematical programming method possible.
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Calculation of dynamic loads of the sucker Rod pumping system in CBM wells
Journal of Coal Science and Engineering (china), 2010Co-Authors: Xinfu Liu, Chunhua Liu, Peihua Zhao, Lei YangAbstract:The mathematical model of dynamic loads was developed based on an analysis of the Polished Rod load of beam pumps, and the variation of the dynamic loads and the computation of the minimum and maximum limits during a complete pumping cycle were given out by solving the model. Field examples verify that it is necessary to take into account the inertial and vibration loads while calculating Polished Rod loads. During the prophase of the pumping pRoduction, the dynamic to Polished Rod load ratio is relatively large. Then the ratio decreases rapidly and becomes small after entering stable pRoduction. Moreover, the total deformation of Rod and tubing in CBM wells is much smaller than that in oil fields, and the deformation caused by the dynamic loads is also relatively small. The result of this work is the calculation of the dynamic loads. The application of this calculation for the sucker Rod pumping system in CBM wells can give the desired accuracy of Polished Rod load and the dynamometer cards, which provides a reasonable basis for the design and selection of beam pumps.
Georgeta Toma - One of the best experts on this subject based on the ideXlab platform.
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Research Concerning the Predictive Evaluation of the Motor Moment at the Crankshaft of the Conventional Sucker Rod Pumping Units
Revista De Chimie, 2019Co-Authors: Dorin Badoiu, Georgeta TomaAbstract:It is well known that the variation on the cinematic cycle of the motor moment at the crankshaft of the conventional pumping units characterizes their proper functioning. In the paper it was developed a predictive calculation model of the motor moment at the crankshaft depending on the force at the Polished Rod. The estimation of the predictive model parameters has been done by minimizing a function that contains the calculus model errors. The experimental records have been processed with the program Total Well Management. The simulations have been performed with a computer program developed by the authors using Maple programming environment.
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Research Concerning the Correlations Between Some Experimental Results in the Case of a Sucker Rod Pumping Installation
Revista De Chimie, 2018Co-Authors: Dorin Badoiu, Georgeta TomaAbstract: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.