Research On Coordinated Production Control Technology For Rod Pump Wells

In the middle and late production period for conventional sucker rod pumping system,the oil production capacity was greater than the formation liquid supply capacity,due to the pump set to the maximum oil production in the initial stage.As a result,the lack of liquid supply,the low fullness of the pump,the low oil production efficiency,and energy wasted.Such uncoordinated supply and discharge led to that the limited production material could not be fully utilized,the energy would be wasted,even if oil was produced,but losses were made.Therefore,under the premise of not changing the structure of the pumping unit,the production optimization control technology of the conventional sucker rod pumping system was studied to achieve efficient and energy-saving production.According to the change of the oil well liquid supply capacity,the pumping parameters were adjusted timely to make the pumping unit always work in a good liquid supply range,then the oil well produced continuously and efficiently in the supply and discharge coordination state.This was the key to optimal control of oil production system.In this paper,the conventional beam pumping unit in the intermittent oil wells was studied.Under the premise of not changing its mechanical structure,through the importance analysis of the producing fluid level,the stroke adjustment method and control method for intermittent pumping wells based on producing fluid level formed and ensured that the oil well was always working in the reasonable liquid level range,which would optimize intermittent pumping institution,improve the system efficiency,reduce energy consumption and increase comprehensive economic benefits.The results of this paper were as follows:1.The relationship between the producing fluid level and strokes was obtained.It was concluded that the producing fluid level was important for oil production.2.Combined with the working mechanism of pump,the method of judging the underground liquid supply ability was choosed out.The mathematical model and simulation of the change rule of producing fluid level for the intermittent pumping well were established.Two methods of continuous measurement of producing fluid level were put forward,sonic method and pump dynamometer card method.3.The stroke adjustment method for intermittent pumping wells based on producing fluid level was proposed.It was a method to obtain the reasonable producing fluid level interval of oil well.The high threshold boundary of the reasonable producing fluid level interval was obtained by the economic limit of oil production.The low threshold boundary was by the reasonable producing fluid level model.4.On the basis of the continuous measurement of producing fluid level and the stroke adjustment method,relevant stroke control method for intermittent pumping wells was proposed.The control model base on the neural fuzzy network controller was built up.Then,the neural network was optimized by genetic annealing algorithm to get the FNN optimizer.The simulation and analysis of the control model were carried out to verify the feasibility and superiority of the FNN optimizer.5.The stroke adjustment and control system for intermittent pumping wells based on producing fluid level was designed and applied to X-1 well.The results showed that,the intermittent pumping institution based on this system was reasonable,achieving efficient production,energy conservation and precision management,increasing comprehensive economic benefits.