The Real-Time Evaluation Method For The Beam-Pump Recovery System

As being the primary producing equipment of oil recovery and the major information reflecting of the reservoirs underground, the Beam-Pump recovery system occupies important position in the petroleum development process. In addition, real-time evaluation is significantly important for Beam-Pump recovery system. The works includes:The pre-knowledge of Beam-Pump recovery system is introduced in this dissertation, which includes its basic architechure and principal scheme. According to the experiences and deficiencies of the evaluation methods of traditional suspended point dynamometer cards and the excellent properties of electric parameters measurement in reliability and economy, the real-time evaluation method of Beam-Pump recovery system based on the electric power cards is proposed. On the other hand, the feasibility analysis is made.According to the lackness of the overall dynamic model of Beam-Pump recovery system , a practical one for simulation and online real-time analysis is putting forward. With problems to the sensor-less torque and rotational speed estimation of the motor, the equivalent circuit model based on voltage source is proposed. The structure theory of the mechanical parts on the ground is analyzed by adopting the vector analytic method to solve the kinetic equation of four-bar mechanism. And gradually the energy consumption is analyzed. The behavioral characteristics of sucker rod are researched. In order to realize real-time dynamic analysis, a simple model of the rod's moving patterns is proposed.According to the characteristics of electric parameters of the beam-Pump unit, multi-scale sampling of data and storage rules are proposed, which undertake more tasks of the system with less hardware resources. Three kinds of data pretreatment and signal analysis methods are put forward: Prediction mean filter algorithm is adopted for signal singular value pretreatment to solves irregular electromagnetic interference problems of practical acquisition signal; In order to solving signals intermittent sampling in deficient period processing problems, the fitting first HHT signals separation method is given; It is found that mean filter residual contains the signal gradient information through analyzing the characteristics of sliding mean filter. Signal gradient calculation method based on mean filtering is brought forward. Compared with Richard extrapolation, the proposed method is better in the calculation speed, boundary effects, etc.As the foundation of whole evaluation system theory system, the establishment of the electric power cards evaluation performance indexes is introduced, and three ways to the system evaluation: graphical method, the different description of system dynamic response processes, and a specific frequency polar images, are brought forward. It is studied that object information feature from the two aspects of mathematical and graphics is suitable for engineering application. At the same time, the application researches on this method in fault diagnosis, productivity prediction, parameter soft measurement and the efficiency of the system analysis are done. Eight kinds of common fault electric power cards features and analysis steps are presented in detail. Formulas of the dynamic liquid level measurement, estimation and the calculating system efficiency are given.Finally, a lot of simulation and experimental works is done to demonstrate the proposed methods. Through an actual case studying, the steps for system evaluation and the application effects are indicated. The shortcomings and development direction of electric power cards evaluation system theory are pointed out.