大港南部油田有杆泵井偏磨机理探讨及综合防治

Mechanism and prevention of uneven abrasion in rod pump wells in southern Dagang Oilfield

陈振江 尹瑞新 郭海勇 郝立新 朱国亮

CHEN Zhenjiang YIN Ruixin GUO Haiyong HAO Lixin ZHU Guoliang

大港油田公司第三采油厂，河北沧县　061023

No.3 Oil Production Plant of PetroChina Dagang Oilfield Company, Cang county 061023, China

大港南部油田部分油井抽油杆和油管偏磨严重，造成抽油杆断脱、油管漏失及频繁作业，严重影响了油田的正常生产。通过对165口因杆管偏磨造成抽油杆断脱、油管漏失的井进行调查分析，结合抽油杆下行阻力理论计算，发现造成杆管偏磨的主要原因是高冲次、高含水、低沉没度导致抽油杆下行弯曲和井斜变化大。结合生产实际提出了抽油杆底部集中加重、中性点扶正、配套应用大流道泵减少抽油杆下行弯曲；底部减少加重、偏磨段连续扶正、上部延伸保护和井口旋转减少井斜偏磨；确定合理的生产参数减少杆柱共振等综合配套防治技术。现场应用表明，提出的方法可有效地改善大港南部油田偏磨现象。

The uneven abrasion between sucker rod and tubing in oil wells resulted in rod break-off, tubing leakage and frequent operation, seriously influencing the normal production of southern Dagang Oilfield. Integration of a review of 165 serious abrasion wells with theoretical calculation of rod down-stroke resistance showed that main abrasion reasons were rod down-stroke bending caused by high stroke per minute, high water cut and low submergence depth and well deviation. This paper presents such measures as increasing weight at the bottom of rod, installing centralizer at neutral point and application of big flow-channel pump to reduce rod down-stroke bending. To reduce the uneven abrasion caused by well deviation, these measures can be taken including decreasing bottom weighted rod, continuous centralizer in uneven abrasion section, upper extensive protection and rotary wellhead. Suitable working system can reduce string resonance. Application reveals these methods have reduced uneven abrasion in southern Dagang Oilfield.