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Calculation Method of Axial Force of Polished Rod of Tower Type Double Well Pumping Unit Based on Kinematics

A calculation method and kinematics technology, applied in construction and other directions, can solve problems such as fracture and damage of polished rods

Active Publication Date: 2021-10-22
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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  • Calculation Method of Axial Force of Polished Rod of Tower Type Double Well Pumping Unit Based on Kinematics
  • Calculation Method of Axial Force of Polished Rod of Tower Type Double Well Pumping Unit Based on Kinematics
  • Calculation Method of Axial Force of Polished Rod of Tower Type Double Well Pumping Unit Based on Kinematics

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Experimental program
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Embodiment 1

[0152] According to the layout and operating principle of the pumping unit, the parameters of the general components are shown in Table 1:

[0153] Table 1 Important components and parameters of the twin well pumping unit

[0154] part parameter electric motor Rotation 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

[0155] 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.

[0156] Step 1) According to the formula Calculate the instan...

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Abstract

The invention discloses a method for calculating the axial force of a polished rod of a tower-type double-well pumping unit based on kinematics, which comprises the following steps: step 1) calculating the instantaneous angular velocity ω of the motor; Oil rod column weight G; step 3) calculate the liquid column weight P above the plunger y ; Step 4) Calculate the load T of suspension point 1 during the entire stroke 1 and the load T on suspension point 2 2 , where the load T of suspension point 1 1 Corresponding to the axial force of the polished rod at the suspension point of the No. 1 well of the tower-type double-well pumping unit, the load T of the suspension point 2 2 Corresponding to the suspension point polished rod axial force of the No. 2 well of the tower-type double-well pumping unit; the advantage of the present invention is that, considering factors such as the interaction of the sucker rod column and components, oil viscosity, inertia, etc., according to the operation of the pumping unit Based on this, important design parameters such as the maximum load of the suspension point (polished rod) and section diameter are obtained; at the same time, the cause of failure (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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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/009
CPCE21B47/009
Inventor 袁晓光
Owner NANTONG UNIVERSITY