Extraction method of valve opening and closing points of indicator diagram of pumping well based on physical significance
A technology for state identification and pumping wells, which is applied in the fields of fluid production, earthwork drilling and production, wellbore/well components, etc., and can solve problems such as large error in results, unclear physical meaning, and error
Inactive Publication Date: 2013-06-12
HOHAI UNIV +1
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Problems solved by technology
In the rod pumping system, there is strong Coulomb friction between the sucker rod string and the tubing, which is a complex nonlinear system coupled with electromechanical and hydraulic systems. It is very difficult to solve the sum and the boundary conditions and damping coefficients cannot be accurately determined, resulting in a certain error between the calculated results and the measured values, and the calculated pump dynamometer diagram is an approximate result
Utilizing the approximate pump dynamometer diagram and determining the opening and closing points according to the load-displacement relationship, the physical meaning is not clear, and the result error is large
Method used
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Embodiment Construction
[0088] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0089] The flow chart of the method for extracting the opening and closing points of the pumping well indicator diagram based on the physical meaning of the present invention is as follows: figure 2 shown.
[0090] 1) Read data and perform data preprocessing: read a series of discrete point data obtained from the measurement of the dynamometer diagram, and use the lower dead point as the starting point of time, that is, the time of the lower dead point is equal to 1, and the load and displacement data Sort according to the data collection time; take the sorted data as sample points, and use 1 as the unit time interval to form displacement-time relationship curves and load-time relationship curves; The displacement-time curve and the load-time curve correspond to each other by time;
[0091] 2) Directly extract the minimum displacement point from the displacement-t...
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The invention relates to an extraction method of valve opening and closing points of an indicator diagram of a pumping well based on physical significance, a displacement-time curve and a load-time curve are obtained by the indicator diagram, and a travelling valve closing point A, a fixed valve closing point C, a fixed valve opening point B and a travelling valve opening point D are sequentially determined by the two curves. The method is realized by directly extracting the valve opening and the closing points from the first-hand information-ground indicator diagram which is collected on the oil production site of the pumping well, the physical significance of the whole process is definite, and the positions of the valve opening and the closing points on the indicator diagram are precisely determined, thereby laying a good foundation for eliminating faults of an oil well, ensuring the normal production of the oil well, improving the yield of the oil well and the like.
Description
technical field [0001] The invention relates to a method for extracting the opening and closing points of Vers on the work diagram of an oil pumping well, in particular to a method for directly extracting the opening and closing points of Vers on the surface work diagram of an oil pumping well, which is a method for indicating work of an oil pumping well based on physical meaning Tufan open and close point extraction method. Background technique [0002] Suspension point dynamometer diagram, also known as ground dynamometer diagram or polished rod dynamometer diagram, is the first-hand information collected on-site for oil production of pumping wells. The dynamometer diagram is used as the curve carrier to record the pumping well pump work conditions, and its quantitative analysis is very important and has practical significance for eliminating oil well failures, ensuring normal production of oil wells, or increasing oil well production. As we all know, the geometric charac...
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IPC IPC(8): E21B43/00G06F17/50
Inventor 梁华唐敢李训铭
Owner HOHAI UNIV