The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Xianwen Gao - One of the best experts on this subject based on the ideXlab platform.

  • Sucker Rod Pump Working State Diagnosis Using Motor Data and Hidden Conditional Random Fields
    IEEE Transactions on Industrial Electronics, 2020
    Co-Authors: Boyuan Zheng, Xianwen Gao, Rong Pan
    Abstract:

    In oil exploitation, the short maintenance period and the poor real-time performance of Dynamometer Card sensors limit the timely working state diagnosis for sucker rod pumps (SRP). The motor is the power source of the SRP that provides all the energy required to lift the oil from underground to surface. The motor power output is highly associated with the working state of the entire equipment. Thus, this article proposes a new strategy to predict the working state of SRP based on motor power. First, seven novel features are extracted from motor power data to support the modeling and diagnosing processes, with the consideration of the significant parameters such as valve's working points and the operating cycle of SRP. Moreover, a custom-designed multiple hidden conditional random fields model with time window is employed as the classifier to identify different working states. At last, the proposed method is validated by a set of motor power data collected from wells by a self-developed device. The experimental result demonstrates the effectiveness of the proposed method for the working state diagnosis of SRPs.

  • Electric-Parameter-Based Inversion of Dynamometer Card Using Hybrid Modeling for Beam Pumping System
    Hindawi Limited, 2018
    Co-Authors: Jingliang Wei, Xianwen Gao
    Abstract:

    Conventional fault diagnosis and production calculation of an oil well can be conducted with the surface Dynamometer Cards, which are obtained by load sensor installed on the horse head. This method to measure the Dynamometer Cards is limited by the sensor maintenance and calibration, battery replacement, and safety hazards for staff. As the basic parameter of the oil extraction industry, electric parameters have the advantages of low cost and high efficiency. So the inversions of Dynamometer Card with electric parameters are attracting more and more attention. In order to solve the problem of insufficient data and consider the real-time performance in the actual oil extraction process, this paper proposes a novel hybrid model which consists of two parts: the mechanism model of polished rod load and the suspension displacement calculated with the space vector equations of motor and a data-dependent kernel online sequential extreme learning machine (DDKOS-ELM) model proposed to correct the output error of the mechanism model, which improves the kernel function selection and makes it real-time. Thus, the highlights of this paper can be summed up in two points: (1) under the circumstance of the bottom dead point detection without sensors, the mechanism modeling of the polished rod load and suspension displacement has been carried out from the perspective of mathematical model of AC motor; (2) a novel data-driven model based on data-dependent kernel online sequential extreme learning machine (DDKOS-ELM) has been proposed to improve the kernel functions selection. The coefficients in the data-dependent kernel function are optimized with improved free search algorithm (IFSA). The proposed hybrid model has been applied to a normal working oil well and the prediction results show better accuracy than the pure data-driven model and mechanism model

  • Diagnosis of sucker rod pumping based on Dynamometer Card decomposition and hidden Markov model
    Transactions of the Institute of Measurement and Control, 2018
    Co-Authors: Boyuan Zheng, Xianwen Gao
    Abstract:

    In oil field production, Dynamometer Card is the key source of information to analyze the down-hole operating conditions of sucker rod pumping. However, under different operating conditions, most of the existing diagnostic technologies are incapable to extract features from Dynamometer Cards automatically and comprehensively. Based on the mechanism analysis of Dynamometer Card, a useful diagnostic method with novel feature extraction method is proposed for diagnosing the operating condition of sucker rod pumping. A novel barycentric decomposition strategy is applied to divide the Dynamometer Cards, which can automatically adjust divided regions according to the shape change of Dynamometer Card. The curve moments are extracted from the parts of divided results to obtain the comprehensive features for the follow-up algorithm. Subsequently, the hidden Markov model with mixture density function is designed as a classifier to map the relationship between the operating condition and the features of Dynamometer ...

  • Sucker rod pumping diagnosis using valve working position and parameter optimal continuous hidden Markov model
    Journal of Process Control, 2017
    Co-Authors: Boyuan Zheng, Xianwen Gao
    Abstract:

    Abstract Down-hole operating condition diagnosis based on Dynamometer Card is a key subject for sucker rod pumping in oil extraction engineering. In this technology, feature extraction and diagnostic model are two indispensable elements. To accurately and automatically diagnose the operating condition by computer, a novel diagnostic method for sucker rod pumping is proposed. The first novel idea is to extract seven geometric features, which are obtained from Dynamometer Card using barycentric decomposition algorithm and valve working position. The second novel idea focuses on the use of continuous hidden Markov model (CHMM) to create classifiers for diagnosing the down-dole operating conditions and then clonal selection algorithm (CSA) is used to optimize the selection of initial parameters for CHMM. Finally, the proposed method is tested on an oil field Dynamometer Card set. Furthermore, this technique is compared with some other existing approaches. The simulation results demonstrate that the performance using the method proposed in this paper is satisfactory.

  • Multiple fault diagnosis of down-hole conditions of sucker-rod pumping wells based on Freeman chain code and DCA
    Petroleum Science, 2013
    Co-Authors: Xianwen Gao, Wei-bing Yang, Ying-long Dai, Zhongda Tian
    Abstract:

    It is important to achieve continuous, stable and efficient pumping well operation in actual oilfield operation. Down-hole pumping well working conditions can be monitored in real-time and a reasonable production scheme can be designed when computer diagnosis is used. However, it is difficult to make a comprehensive analysis to supply efficient technical guidance for operation of the pumping well with multiple faults of down-hole conditions, which cannot be effectively dealt with by the common methods. To solve this problem, a method based on designated component analysis (DCA) is used in this paper. Freeman chain code is used to represent the down-hole Dynamometer Card whose important characteristics are extracted to construct a designated mode set. A control chart is used as a basis for fault detection. The upper and lower control lines on the control chart are determined from standard samples in normal working conditions. In an incompletely orthogonal mode, the designated mode set could be divided into some subsets in which the modes are completely orthogonal. The observed data is projected into each designated mode to realize fault detection according to the upper and lower control lines. The examples show that the proposed method can effectively diagnose multiple faults of down-hole conditions.

Hongzhao Liu - One of the best experts on this subject based on the ideXlab platform.

  • Prediction and Analysis of Polished Rod Dynamometer Card in Sucker Rod Pumping System with Wear
    Hindawi Limited, 2018
    Co-Authors: Dongyu Wang, Hongzhao Liu
    Abstract:

    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

  • Dynamic Modeling and Analysis of Sucker Rod Pumping System in a Directional Well
    Lecture Notes in Electrical Engineering, 2016
    Co-Authors: Dongyu Wang, Hongzhao Liu
    Abstract:

    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.

  • identification for sucker rod pumping system s damping coefficients based on chain code method of pattern recognition
    Journal of Vibration and Acoustics, 2007
    Co-Authors: Hongzhao Liu, Bai Xi Liu, Daning Yuan, Jianhua Rao
    Abstract:

    In this paper, a method for identifying the damping coefficients of a directional well sucker-rod pumping system is put forward by means of the chain code method of pattern recognition. The 24-directional chain code is provided to encode the Dynamometer Card curve. The parametric equation of the Dynamometer Card curve is transformed into Fourier series whose coefficients can be computed according to the curve's chain codes. By means of these coefficients, shape characteristics of the curve are extracted. The Euclidean distance is introduced as the measurement of similar degree between the shape characteristics of measured Dynamometer Card and that of simulated Dynamometer Card. Changing the value of viscous damping coefficient and Coulomb friction coefficient in the simulation program, different simulated Dynamometer Cards are obtained. Substituting their shape characteristics to the Euclidean distance, respectively, a series of distances are acquired. When the distance is less than the given error, the corresponding values of the damping coefficients in the simulation program are regarded as real damping coefficients of the sucker-rod pumping system of directional well. In the end, an example is provided to show the correctness and effectiveness of the presented method.

  • Identification for Sucker-Rod Pumping System’s Damping Coefficients Based on Chain Code Method of Pattern Recognition
    Journal of Vibration and Acoustics, 2007
    Co-Authors: Hongzhao Liu, Bai Xi Liu, Daning Yuan, Jianhua Rao
    Abstract:

    In this paper, a method for identifying the damping coefficients of a directional well sucker-rod pumping system is put forward by means of the chain code method of pattern recognition. The 24-directional chain code is provided to encode the Dynamometer Card curve. The parametric equation of the Dynamometer Card curve is transformed into Fourier series whose coefficients can be computed according to the curve's chain codes. By means of these coefficients, shape characteristics of the curve are extracted. The Euclidean distance is introduced as the measurement of similar degree between the shape characteristics of measured Dynamometer Card and that of simulated Dynamometer Card. Changing the value of viscous damping coefficient and Coulomb friction coefficient in the simulation program, different simulated Dynamometer Cards are obtained. Substituting their shape characteristics to the Euclidean distance, respectively, a series of distances are acquired. When the distance is less than the given error, the corresponding values of the damping coefficients in the simulation program are regarded as real damping coefficients of the sucker-rod pumping system of directional well. In the end, an example is provided to show the correctness and effectiveness of the presented method.

  • A New Recognition Method for Damping Coefficients of Rod Pumping System of Directional Well
    Volume 3: Dynamic Systems and Controls Symposium on Design and Analysis of Advanced Structures and Tribology, 2006
    Co-Authors: Bai Xi Liu, Hongzhao Liu, Daning Yuan, Jianhua Rao
    Abstract:

    In this paper, a pattern recognition method is put forward to identify damping coefficients of rod pumping system of directional well by using characteristics space mapping. The 24-direction chain code is presented to encode the curve of Dynamometer Card. The parametric equation of the Dynamometer Card curve is transformed into Fourier series whose coefficients can be computed according to the curve’s chain codes. By means of those Fourier coefficients, shape characteristics of the curve are extracted. Euclidean distance is introduced as the measurement of similar degree between the shape characteristics of measured Dynamometer Card and that of simulated Dynamometer Card. Changing the value of viscous damping coefficient and Coulomb damping coefficient in the simulation program, different simulated Dynamometer Cards are obtained. Substituting their shape characteristics to the Euclidean distance, respectively, a series of distances are acquired. When the distance is little than the given error, the corresponding values of the damping coefficients in the simulation program are regarded as real damping coefficients of the rod pumping system of directional well. In the end, an example is provided to show the correctness and effectiveness of the presented method.Copyright © 2006 by ASME

Boyuan Zheng - One of the best experts on this subject based on the ideXlab platform.

  • Sucker Rod Pump Working State Diagnosis Using Motor Data and Hidden Conditional Random Fields
    IEEE Transactions on Industrial Electronics, 2020
    Co-Authors: Boyuan Zheng, Xianwen Gao, Rong Pan
    Abstract:

    In oil exploitation, the short maintenance period and the poor real-time performance of Dynamometer Card sensors limit the timely working state diagnosis for sucker rod pumps (SRP). The motor is the power source of the SRP that provides all the energy required to lift the oil from underground to surface. The motor power output is highly associated with the working state of the entire equipment. Thus, this article proposes a new strategy to predict the working state of SRP based on motor power. First, seven novel features are extracted from motor power data to support the modeling and diagnosing processes, with the consideration of the significant parameters such as valve's working points and the operating cycle of SRP. Moreover, a custom-designed multiple hidden conditional random fields model with time window is employed as the classifier to identify different working states. At last, the proposed method is validated by a set of motor power data collected from wells by a self-developed device. The experimental result demonstrates the effectiveness of the proposed method for the working state diagnosis of SRPs.

  • Diagnosis for Sucker Rod Pumps Using Bayesian Networks and Dynamometer Card
    2019 Prognostics and System Health Management Conference (PHM-Qingdao), 2019
    Co-Authors: Boyuan Zheng
    Abstract:

    The automatic diagnosis for sucker rod pump (SRP) is an essential measurement to ensure the oil fields' interests in the oil recovery. As the important information resource on monitoring and diagnosis, the Dynamometer Card (DC) plays an irreplaceable role in oil engineering. In the application, how to use DC to fulfill the diagnosis is always the key to this problem. Thus, a novel method based on load analysis and Bayesian network is proposed in this paper. At first off, DC's coordinate is transformed to cater to the load analysis, which provides an instinctive way for analyzing. After that, five statistical features and Shannon entropy are extracted from the DC, which are employed as the input of the Bayesian network (BN) presented in the particular framework. At last, a set of field Dynamometer Card is employed as the experimental data and the experimental results demonstrate the feasibility and superiority of the proposed method for diagnosing the working states of SRPs.

  • Diagnosis of sucker rod pumping based on Dynamometer Card decomposition and hidden Markov model
    Transactions of the Institute of Measurement and Control, 2018
    Co-Authors: Boyuan Zheng, Xianwen Gao
    Abstract:

    In oil field production, Dynamometer Card is the key source of information to analyze the down-hole operating conditions of sucker rod pumping. However, under different operating conditions, most of the existing diagnostic technologies are incapable to extract features from Dynamometer Cards automatically and comprehensively. Based on the mechanism analysis of Dynamometer Card, a useful diagnostic method with novel feature extraction method is proposed for diagnosing the operating condition of sucker rod pumping. A novel barycentric decomposition strategy is applied to divide the Dynamometer Cards, which can automatically adjust divided regions according to the shape change of Dynamometer Card. The curve moments are extracted from the parts of divided results to obtain the comprehensive features for the follow-up algorithm. Subsequently, the hidden Markov model with mixture density function is designed as a classifier to map the relationship between the operating condition and the features of Dynamometer ...

  • Sucker rod pumping diagnosis using valve working position and parameter optimal continuous hidden Markov model
    Journal of Process Control, 2017
    Co-Authors: Boyuan Zheng, Xianwen Gao
    Abstract:

    Abstract Down-hole operating condition diagnosis based on Dynamometer Card is a key subject for sucker rod pumping in oil extraction engineering. In this technology, feature extraction and diagnostic model are two indispensable elements. To accurately and automatically diagnose the operating condition by computer, a novel diagnostic method for sucker rod pumping is proposed. The first novel idea is to extract seven geometric features, which are obtained from Dynamometer Card using barycentric decomposition algorithm and valve working position. The second novel idea focuses on the use of continuous hidden Markov model (CHMM) to create classifiers for diagnosing the down-dole operating conditions and then clonal selection algorithm (CSA) is used to optimize the selection of initial parameters for CHMM. Finally, the proposed method is tested on an oil field Dynamometer Card set. Furthermore, this technique is compared with some other existing approaches. The simulation results demonstrate that the performance using the method proposed in this paper is satisfactory.

Yuan Lan - One of the best experts on this subject based on the ideXlab platform.

  • An energy-saving pumping system with novel springs energy storage devices: Design, modeling, and experiment
    Advances in Mechanical Engineering, 2017
    Co-Authors: Hong Jun Meng, Long Quan, Zhanlin Wang, Cheng Wen Wang, Yuan Lan
    Abstract:

    For the traditional reciprocating pumping unit, it generally starts at the bottom dead point with full load and is accelerated when starting and decelerated when stopping, which not only requires great energy from the motor but also impact on the output torque of motor. In order to tackle the above problems, we propose an energy-saving smooth reversing pumping system, which could store the energy in deceleration by making use of springs, and the stored energy could be reused in acceleration after reversion. This novel system targets to make the motor starting with light load, which could reduce the fluctuation in motor torque, decrease the starting time. In this article, a dynamic model and an efficiency model are established to compute the polished rod load Dynamometer Card and efficiency of the pumping unit. It is shown that the installed springs could help to reduce the impact on the system when reversing, and significantly decrease the energy consumption. In addition, we set up the real pumping system...

  • An energy-saving pumping system with novel springs energy storage devices: Design, modeling, and experiment
    SAGE Publishing, 2017
    Co-Authors: Hong Jun Meng, Long Quan, Zhanlin Wang, Cheng Wen Wang, Yuan Lan
    Abstract:

    For the traditional reciprocating pumping unit, it generally starts at the bottom dead point with full load and is accelerated when starting and decelerated when stopping, which not only requires great energy from the motor but also impact on the output torque of motor. In order to tackle the above problems, we propose an energy-saving smooth reversing pumping system, which could store the energy in deceleration by making use of springs, and the stored energy could be reused in acceleration after reversion. This novel system targets to make the motor starting with light load, which could reduce the fluctuation in motor torque, decrease the starting time. In this article, a dynamic model and an efficiency model are established to compute the polished rod load Dynamometer Card and efficiency of the pumping unit. It is shown that the installed springs could help to reduce the impact on the system when reversing, and significantly decrease the energy consumption. In addition, we set up the real pumping system with load test system to verify the effectiveness of the model establishment. Through the experiment, the proposed pumping system could save energy up to 9.204% as compared to the traditional reciprocating pumping system

Li Xunming - One of the best experts on this subject based on the ideXlab platform.

  • Extraction of some feature values based on the surface Dynamometer Card
    Proceedings of the 31st Chinese Control Conference, 2012
    Co-Authors: Li Xunming
    Abstract:

    Geometric feature values are obtained from surface Dynamometer Card as object of fault distinguish. Method of selecting top dead center and bottom dead center as feature values used in fault distinguish and gaining turn-on and turn-off position of travel and set valve as feature values if necessary in fault identification is proposed. The extraction of valve opening and closing points is the basis for the identification and quantitative analysis of pumping well Dynamometer Cards, and it is important for the failure diagnosis and production evaluation of pumping wells. This method ensures the independence and compatibility of feature values. And the method reduces the workload and improves identification of feature values as well.

  • Accurate extraction of valve opening and closing points based on the physical meaning of surface Dynamometer Card
    KeAi Communications Co. Ltd., 2011
    Co-Authors: Liang Hua, Li Xunming
    Abstract:

    The extraction of valve opening and closing points is the basis for the identification and quantitative analysis of pumping well Dynamometer Cards, and it is important for the failure diagnosis and production evaluation of pumping wells. In light of the working principle of sucker rod pump and the physical meaning of surface Dynamometer Card, this paper discusses theoretically valve opening and closing points and presents an accurate method of extracting the valve opening and closing points of surface Dynamometer Cards. After the top and bottom dead centers are determined on displacement-time curve and the loading history curve is dealt with by parition and de-noising (smooth de-noisng, curve fitting and iteration de-noising), methods of exhaustion and comparison are applied to find optimal solutions and to determine the opening points of travel valve and set valve. The opening points of the valves are determined by the same method. A corresponding computer program is developed and analyses of 1 000 examples indicate that this approach is effective. Key words: pumping well, surface Dynamometer Card, valve opening and closing points, physical meaning, partition, de-noisin

  • Accurate extraction of valve opening and closing points based on the physical meaning of surface Dynamometer Card
    Petroleum Exploration and Development, 2011
    Co-Authors: Liang Hua, Li Xunming
    Abstract:

    Abstract The extraction of valve opening and closing points is the basis for the identification and quantitative analysis of pumping well Dynamometer Cards, and it is important for the failure diagnosis and production evaluation of pumping wells. In light of the working principle of sucker rod pump and the physical meaning of surface Dynamometer Card, this paper discusses theoretically valve opening and closing points and presents an accurate method of extracting the valve opening and closing points of surface Dynamometer Cards. After the top and bottom dead centers are determined on displacement-time curve and the loading history curve is dealt with by parition and de-noising (smooth de-noisng, curve fitting and iteration de-noising), methods of exhaustion and comparison are applied to find optimal solutions and to determine the opening points of travel valve and set valve. The opening points of the valves are determined by the same method. A corresponding computer program is developed and analyses of 1 000 examples indicate that this approach is effective.