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Method for calculating the axis force of tower double well pumping unit polish rod based on kinematic mechanics

A calculation method and kinematics technology, which can be used in construction and other directions to solve problems such as fracture and damage of polished rods.

Active Publication Date: 2018-10-23
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The suspension point is usually a polished rod, and the polished rod is often broken and damaged during the operation of the oil machine

Method used

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  • Method for calculating the axis force of tower double well pumping unit polish rod based on kinematic mechanics
  • Method for calculating the axis force of tower double well pumping unit polish rod based on kinematic mechanics
  • Method for calculating the axis force of tower double well pumping unit polish rod based on kinematic mechanics

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0150] According to the layout and operating principle of the pumping unit, the parameters of the general components are shown in Table 1:

[0151] Table 1 Important components and parameters of the twin well pumping unit

[0152] part

parameter

electric motor

Angular velocity ω, torque M, power P=Mω

reducer

speed ratio r

Turning wheel of well 1

Radius R1

Turning wheel of well 2

Radius R2

Well 1

Depth H1, stroke S1, stroke C

Well 2

Depth H2, stroke S2, stroke C

[0153] Take stroke C=6 times / min (period m=10 seconds), stroke S=7 meters, No. 1 well and No. 2 well turning wheel radii R1=0.35 meters, R2=0.25 meters as example. The pumping depth of No. 1 well is 700 meters, and the pumping depth of No. 2 well is 500 meters. The diameter of oil extraction strings 1 and 2 is 0.022225 meters. The material is steel Q235, and the oil density is 880 kg / m3.

[0154] Step 1) According to the formula Cal...

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Abstract

The invention discloses a method for calculating the axial force of a tower double well pumping unit polish rod based on kinematic mechanics. The method comprises the following steps of: step 1) calculating the instantaneous angular velocity Omega of a motor; step 2) calculating the weight G of a rod string immersed in petroleum; step 3) calculating the weight Py of liquid column above the plunger; step 4) calculating the load T1 of the suspended point 1 and the load T2 of the suspended point 2 during the whole stroke, wherein the load T1 of the suspended point 1 corresponds to the polish rodaxial force of the suspension point of the well No.1 of the tower double well pumping unit, and the load T2 of the suspended point 2 corresponds to the polish rod axial force of the suspension point of the well No.2 of the tower double well pumping unit. The method has the advantages that considering the interaction of the rod string, the components, the viscosity of oil, the inertia and so on, according to the operation of the pumping unit, the basic equation of the kinematic mechanics of the pumping unit is given, and the maximum load of the hanging point (polish rod) the cross-section diameter and other important design parameters are obtained; at the same time, the cause (fracture, fatigue) can also be analyzed.

Description

technical field [0001] The invention relates to a method for calculating the axial force of a polished rod of a tower-type double-well pumping unit based on kinematics. Background technique [0002] The existing tower-type one-machine double-well pumping unit includes a tower frame, a top loading platform fixed on the top of the tower frame, a horizontal support arm fixed on the top loading platform, a guide wheel fixed on the end of the horizontal support arm, a motor fixed on the top loading platform, and an electric motor The output power is transmitted to the power shaft through the reversible gearbox and the belt, the No. 1 well running wheel and the No. 2 well running wheel are fixed on the power shaft, and the power rope is wound on the two turning wheels. The guide wheels are respectively connected with the sucker rod string in the wellhead at the suspension points. In this way, the reciprocating movement of the sucker rod string can be realized by the mechanism of ...

Claims

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Application Information

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IPC IPC(8): E21B47/009
CPCE21B47/009
Inventor 袁晓光
Owner NANTONG UNIVERSITY