Span design method of sucker rod centralizer and oil well anti-deviation wear optimization design method

By establishing a three-dimensional mechanical model of the sucker rod string and optimizing the span design of the centralizer, combined with special structures and materials, the problem of uneven wear between the sucker rod and tubing was solved, the anti-wear effect was improved, the service life of the equipment was extended, and the cost was reduced.

CN117365324BActive Publication Date: 2026-07-24PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
PETROCHINA CO LTD
Filing Date
2022-06-30
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

The uneven wear between the sucker rod and tubing in existing oil wells is severe, leading to frequent tubing leaks, rod breakage, and rod detachment, which affects the normal production of oil wells. Furthermore, the existing centralizer design cannot effectively prevent uneven wear.

Method used

By establishing a three-dimensional mechanical model of the sucker rod string, calculating the lateral deformation using the finite element iterative method, optimizing the centralizer span design, and adopting a special structure integral rod centralizer combined with nano-polymer composite material injection molding, the anti-wear effect is improved.

Benefits of technology

Accurately predicting the location of uneven wear improves the effectiveness of the centralizer, reduces friction, extends the service life of the sucker rod and tubing, and lowers operating costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a kind of oil well sucker rod whole rod centralizer span design methods, it includes: step 1: determining the three-dimensional well trajectory of single well;Step 2: based on the three-dimensional well trajectory of single well determined, establish sucker rod string three-dimensional mechanics model;Step 3: based on the sucker rod string three-dimensional mechanics model established, using finite element iterative method, the lateral deformation of each position of sucker rod string is calculated, and the lateral deformation of each position of sucker rod string is based on to optimize the sucker rod whole rod centralizer span design.Based on the above method, the use position and quantity of centralizer can be determined scientifically and reasonably to improve the use effect of centralizer by scientifically and reasonably carrying out the anti-deviation wear design.The application further discloses an oil well anti-deviation wear optimization design method.
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