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Method for determining optimal oil pumping rate of beam-pumping unit

A beam pumping unit and the best technology are applied in the field of determining the optimal pumping rate of the beam pumping unit, which can solve problems such as mismatching, and achieve the effects of improving pump efficiency and reducing oil consumption.

Pending Publication Date: 2022-06-24
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of the mismatch between the plunger movement law of the oil pump and the working conditions of the oil well, and improve the oil production efficiency of the pumping well, the present invention proposes a method for determining the optimal pumping rate of the beam pumping unit based on the comprehensive working conditions downhole. method, in order to determine a reasonable relationship between supply and discharge, optimize the speed of plunger movement, and improve pump efficiency; optimize the acceleration of suspension points to reduce inertial loads;

Method used

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  • Method for determining optimal oil pumping rate of beam-pumping unit
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  • Method for determining optimal oil pumping rate of beam-pumping unit

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Embodiment 1

[0053] like figure 1 As shown, the method for determining the optimal pumping rate of the beam pumping unit in the present application includes: S101, determining an inflow characteristic curve; S102, determining an outflow characteristic curve; S103, drawing an oil well according to the inflow characteristic curve and the outflow characteristic curve Supply and discharge coordination diagram; S104, calculate the dynamic liquid surface depth; S105, calculate the reasonable subsidence degree; S106, express the motion equation of the pump plunger in the form of a Fourier series expansion; S107, calculate the distance between the plunger and the fixed valve S108, calculate the liquid volume in the pump cavity; S109, calculate the pump filling coefficient by combining the pump cavity volume and the liquid volume in the pump cavity; S110, determine the constraints; S111, calculate the Fourier series expansion Optimal coefficients of each item; S112, determine the optimized oil well...

Embodiment 2

[0056] The invention proposes for the first time that the Fourier series is used to construct the motion equation of the oil well pump plunger, the pump fullness coefficient is used as the optimization objective function, and the pump efficiency and the life of the sucker rod are the constraints to calculate and solve the optimal oil well pump piston motion The law equation is used to reverse the suspension point and the motor movement rate using the plunger motion law equation, so as to obtain the optimal pumping rate that matches the downhole working conditions.

[0057] The method of the present application includes the following steps: (1) combining parameters such as bottom-hole flow pressure, fluid production index, formation pressure, saturation pressure, etc., to obtain an oil well fluid production equation, and determine the inflow characteristic curve; (2) combining subsidence pressure, tubing diameter, friction (3) According to the inflow characteristic curve and the...

Embodiment 3

[0086] The pumping unit is CYJ10-3-37HB type, with a stroke of 3m and a stroke of 6min -1 . The basic parameters of the oil well and the physical properties of the fluid are shown in Table 1:

[0087] Table 1 Basic parameters and fluid physical parameters of oil wells

[0088]

[0089] as attached figure 2 As shown, first determine the inflow characteristic curve q according to the basic parameters of the oil well o =6.045(14.8-p wf ), and outflow characteristic curve And draw the supply and discharge coordination diagram of the oil well. The intersection of the two curves in the figure is the best supply and discharge coordination point, and this numerical point is the best point where the oil well can obtain the maximum lifting output (that is, p wf =5.5MPa,q o =48m 3 / d). According to the determined optimal supply and discharge coordination point values ​​and basic parameters of the oil well, the dynamic liquid surface value is calculated to be 860m and the r...

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Abstract

The invention provides a method for determining the optimal oil pumping rate of a beam-pumping unit. The method comprises the steps that an inflow characteristic curve is determined; determining an outflow characteristic curve; drawing an oil well supply and discharge coordination diagram according to the inflow characteristic curve and the outflow characteristic curve; calculating the working fluid level depth; calculating a reasonable submergence degree; expressing an oil well pump plunger motion equation in a Fourier series expansion form; calculating the volume of a pump cavity between the plunger and the standing valve; calculating the volume of liquid in the pump cavity; calculating a pump fullness coefficient by combining the volume of the pump cavity and the volume of liquid in the pump cavity; determining constraint conditions; calculating each optimal coefficient of the Fourier series expansion; an optimized oil well pump plunger motion equation is determined; and the suspension point motion equation and the motor motion rate are reversely deduced through the oil well pump plunger motion equation. On the premise that the service life of an oil pumping system is not shortened, the pump efficiency and the oil pumping efficiency are improved, and the oil pumping consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of oil production, and in particular relates to a method for determining the optimal pumping rate of a beam pumping unit based on comprehensive downhole working conditions. Background technique [0002] The beam pumping unit has the advantages of simple geometric structure and reliable quality, so it has a very important position in the mechanical oil recovery of the oil field. Up to now, in my country's oilfield production, mechanical oil production wells account for 98% of all oil wells, of which beam pumping wells account for 96% of all mechanical oil production wells. With the continuous development of the oil field, the liquid supply capacity of the formation continues to decline, the liquid production volume of the oil well gradually decreases, and the problems of low efficiency of the oil production system and high energy consumption become increasingly prominent, which seriously restricts the economi...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F30/17E21B43/12G06F119/08G06F119/14
CPCG06F30/20G06F30/17E21B43/127G06F2119/08G06F2119/14E21B2200/20
Inventor 李汉周段志刚司志梅王志马建杰
Owner CHINA PETROLEUM & CHEM CORP
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