Research On Soft Measurement And Lifting Control Method Of Mining Efficiency

The efficiency of mechanical production is the key parameter to analyze the production and operation of the oilfield,formulate and optimize the development plan of the oilfield.The measurement of the efficiency of mechanical production is helpful to formulate a more reasonable swabbing system,and ensure that the pumping unit is safer and more efficient in the operation process.The improvement and control of the efficiency of mechanical production is the necessary measure to complete the goal of energy saving and efficiency improvement and stabilize the domestic oil price.The conventional machine mining efficiency measurement method is manual measurement,which has the defects of large resource consumption and poor real-time performance.At the same time,due to the long development time and large proportion of low permeability wells in China,there is a widespread problem of low mechanical recovery efficiency.In this thesis,the key technical problems of the above two oil well development-mechanical production efficiency measurement technology and mechanical production efficiency improvement control technology are studied.Its main research contents and results are described below.This thesis illustrates the importance of measurement and lifting control technology of well site mining efficiency,and studies the causes,characteristics and development trend of the two problems of difficult real-time measurement and low efficiency of well site mining efficiency.On this basis,the soft measurement technology of well field mining efficiency and the control technology of improving mining efficiency based on dynamic liquid level soft measurement are proposed.The soft measurement method of mechanical mining efficiency is studied.A series of mathematical models are established by taking the driving electro-mechanical parameters as the starting point,so as to replace the hardware measurement with software calculation to realize the soft measurement of mechanical mining efficiency.Firstly,the power parameter measurement theory of drive motor is introduced.The mathematical calculation model of donkey-head suspension point displacement was established by taking the beam inclination angle as the input and combining with the fixed parameters of the four-link mechanism of the pumping unit,and the mathematical calculation model of donkey-head suspension point load was constructed by taking the driving electro-mechanical parameters and the beam inclination angle as the input.The stroke cycle was judged by identifying the upper and lower dead points,and then the obtained indicator diagram was processed by singular value elimination and filtering,so as to realize the soft measurement of the ground indicator diagram.Then through the establishment of indicator diagram measuring liquid production mathematical calculation model to achieve liquid production calculation;finally,the real-time measured liquid production and pumping unit system power consumption are substituted into the mathematical calculation model of machine mining efficiency to realize the soft measurement of machine mining efficiency.The main reasons and influencing factors of low mechanical mining efficiency in the well field are studied,and the inter-pumping control method based on the dynamic liquid level soft measurement technology is proposed to improve the mining efficiency of the hoist.It indicates the importance of dynamic liquid level in oil well development;the mathematical relationship between the hanging point load of donkey head and the dynamic liquid level height was studied,and the mathematical calculation model of dynamic liquid level soft measurement was established with the driving electro-mechanical parameters as the input.Taking the dynamic liquid level height as the data source,the starting time is predicted by the grey system theory,and the starting time is used as the heuristic information.The closing time is predicted by the climbing method,so as to realize the pumping control between the pumping units and improve the efficiency of the well site.The technical implementation of soft measurement and lifting control method of well field production efficiency is studied.The overall structure of the soft-sensing and lifting control system for mining efficiency is designed;the software and hardware design of the intelligent terminal for mechanical efficiency measurement and lifting control and the HPLC communication module are carried out respectively.The upper computer interface is designed to realize remote monitoring function.Experiments and analysis were carried out in the laboratory and field.By collecting the actual operation parameters of the oil well,the proposed online soft measurement method and lifting control technology of the well field production efficiency are simulated and calculated in the laboratory,and the feasibility is verified by data analysis.The experiment was carried out in the oil field,and the operation results show that the designed soft sensor and lifting control system of mechanical recovery efficiency can operate stably.The average error of the measured values of the mechanical mining efficiency obtained by the soft measurement method proposed in this thesis and the actual field measurement is 0.9%,which can realize the real-time and accurate measurement of the mechanical mining efficiency,and the system is easy to install and the operation and maintenance cost is low.Taking the oil well before the transformation as a reference,after the upgrading control technology transformation,the average power saving rate is 8.7%,and the average mechanical recovery efficiency is increased by 0.8%,which effectively meets the measurement and upgrading control requirements of the mechanical recovery efficiency of the well site,and has engineering practical value.