Method for online calculation of working fluid level of oil well by using pumping unit pump indicator diagram

A technology of pump power map and dynamic liquid level, which can be used in computing, special data processing applications, instruments, etc., and can solve the problems of large measurement error, high labor intensity, and inability to realize real-time monitoring.

Inactive Publication Date: 2015-11-25
SINOPEC SHENGLI OILFIELD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Under the traditional management mode, the measurement of the dynamic liquid level is mainly based on the acoustic wave method, and workers need to go to the wellhead for measurement on a regular basis. In addition to the high labor intensity, the measurement error is relatively large, and real-time monitoring cannot be realized.

Method used

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  • Method for online calculation of working fluid level of oil well by using pumping unit pump indicator diagram
  • Method for online calculation of working fluid level of oil well by using pumping unit pump indicator diagram
  • Method for online calculation of working fluid level of oil well by using pumping unit pump indicator diagram

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Experimental program
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Effect test

Embodiment 1

[0031] Firstly, mathematically process the ground indicator diagram with a computer to eliminate the influence of the deformation of the sucker rod string, the viscous resistance of the rod string, vibration and inertia, etc., to obtain a downhole pump indicator that is simple in shape and can truly reflect the working conditions of the pump. Figure.

[0032] The downhole pump has simple force with respect to the suspension point, and the influence of dynamic load is small. Then determine the position of the valve opening and closing points to obtain Fpu and Fpd. According to the analysis of the pressure composition of the downhole pump, the pressure drop caused by friction and acceleration, and other factors with little influence, such as the differential pressure of the gas column, can be obtained. The simplified formula for liquid level calculation is

[0033]

[0034] Where, where

[0035] Fpu is the pump load after the up-stroke fixed valve is opened to before it is closed.

[...

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Abstract

The invention discloses a method for online calculation of a working fluid level of an oil well by using a pumping unit pump indicator diagram. The method for online calculation of the working fluid level of the oil well by using the pumping unit pump indicator diagram is characterized by comprising the following steps: a ground indicator diagram is obtained; a computer is used for mathematically processing to eliminate such influences as deformation of a pumping rod column, viscous resistance of the rod column, vibration and inertia to obtain an underground pump indicator diagram simple in shape and capable of truly reflecting pump working conditions; an underground pump indicator diagram model is built to calculate a fu's series solution and a viscous resistance coefficient v of the underground pump indicator diagram; and then, a curvature model is built according to the relationship between the obtained underground pump indicator diagram and a valve opening/closing point and the viscous resistance coefficient v to determine the valve opening/closing point.

Description

Technical field [0001] The invention belongs to the technical field of oilfield measurement, and specifically relates to a method for online calculation of oil well dynamic liquid level by using a pumping unit pump power diagram. Background technique [0002] In oil field exploitation, the fluid level of an oil well is an important parameter that reflects geological reserves, optimizes production planning, and ensures the safe operation of oil production equipment. The fluid level parameters of an oil well directly reflect the fluid supply situation of the formation and the downhole supply and discharge relationship, and it is one of the key data for the adaptability evaluation and optimization of the oil production process. [0003] Under the traditional management mode, the measurement of the dynamic liquid level is mainly based on the acoustic wave method, and workers need to go to the wellhead for measurement regularly. In addition to the labor intensity, the measurement error ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/047G06F17/50E21B47/009
Inventor 耿延久薛胜东鲁玉庆杨湖川胡勇军崔宁常波高华迟洪利
Owner SINOPEC SHENGLI OILFIELD
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