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Compared with conventional beam pumping unit, the ultra-long stroke pumping unit has a simple structure and fewer moving parts. Its unique characteristics of ultra-long stroke and ultra-low stroke number have outstanding advantages in improving system efficiency and reducing eccentric wear. Due to high failure rate of flexible polished rod and down-hole string, huge energy consumption of down stroke and large error of calculating production using diagram card, the field tests indicated the imported ultra-long stroke pumping unit is not suitable for high angle deviated oil well in Changqing low permeability reservoir. Based on the mechanical theory research of the three dimensional rod string mixed with steel rope and steel rod, a technical series for ultra-long stroke oil production in high angle deviated wells has been developed. The technical series consist of the selection and optimization design of pumping unit type, new structural flexible rod, the matching for wellbore equipment of anti wear and anti scaling in ultra-long stroke oil pump, the production and utilization of inverted power generation, and the diagnosis of working conditions as well as production calculation using diagram card. With the popularization and application of ultra-long stroke oil production technology in 266 wells, the first ultra-long stroke oil production demonstration area for high angle deviated well in Changqing Oilfield has been built. The service life of the flexible rod has reached 700 days, the frequency of rod breakage has decreased from 0.31 to 0.19 times/well year, the daily power consumption of a single well has decreased by 30.4%, the system efficiency has increased by 3.2 percentage points, the accuracy rate of working condition diagnosis is 72.4%, and the proportion of oil wells with a production error calculated using diagram card of ≤ ± 15% has reached 70.7%. The adaptability has been greatly improved, providing reference for improving efficiency and reducing frequency of ultra-long stroke oil production in similar oilfields.

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Optimization Research and Application of Ultra-Long Stroke Oil Production Technology in Changqing Oilfield

  • 会议论文

  • 发表日期：

    2025年

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  • Yi-ming Lv,
  • Ji-jia Sun,
  • Lou-lou Li,
  • Yan Zhang,
  • Hai-xia Shi,
  • Yang Yao

摘要

Compared with conventional beam pumping unit, the ultra-long stroke pumping unit has a simple structure and fewer moving parts. Its unique characteristics of ultra-long stroke and ultra-low stroke number have outstanding advantages in improving system efficiency and reducing eccentric wear. Due to high failure rate of flexible polished rod and down-hole string, huge energy consumption of down stroke and large error of calculating production using diagram card, the field tests indicated the imported ultra-long stroke pumping unit is not suitable for high angle deviated oil well in Changqing low permeability reservoir. Based on the mechanical theory research of the three dimensional rod string mixed with steel rope and steel rod, a technical series for ultra-long stroke oil production in high angle deviated wells has been developed. The technical series consist of the selection and optimization design of pumping unit type, new structural flexible rod, the matching for wellbore equipment of anti wear and anti scaling in ultra-long stroke oil pump, the production and utilization of inverted power generation, and the diagnosis of working conditions as well as production calculation using diagram card. With the popularization and application of ultra-long stroke oil production technology in 266 wells, the first ultra-long stroke oil production demonstration area for high angle deviated well in Changqing Oilfield has been built. The service life of the flexible rod has reached 700 days, the frequency of rod breakage has decreased from 0.31 to 0.19 times/well year, the daily power consumption of a single well has decreased by 30.4%, the system efficiency has increased by 3.2 percentage points, the accuracy rate of working condition diagnosis is 72.4%, and the proportion of oil wells with a production error calculated using diagram card of ≤ ± 15% has reached 70.7%. The adaptability has been greatly improved, providing reference for improving efficiency and reducing frequency of ultra-long stroke oil production in similar oilfields.