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To solve the severe PCP scaling during the ASP flooding in the Daqing Oilfield, PCP anti-scaling and lifting techniques are studied. This paper comprehensively analyzed the reasons and principles of PCP scaling during the ASP flooding, and the common failure modes in PCP wells by scaling. The fit accuracy between PCP's rotor and stator dropping, frictional behavior irregular changing and severe abrading by scaling are the main reasons for the increase of the PCP's failures. Based on these, a comprehensive anti-scaling lift technique for PCP wells was proposed including PCP rotor/stator wring optimization, instrument material surface modification, and chemical clear/anti-scaling technique. By the end of 2010, the comprehensive methodology has been applied in 216 PCP producers 425 times, the average running lives of PCP producers in the ASP flooding were improved from less than 100 days to 298 days after applying the above PCP anti-scaling methodology, the longest one is 1 370 days. 摘要: ：为了解决大庆油田三元复合驱过程中过程中井下生产设备螺杆泵普遍结垢严重的问题，开展了螺杆泵防垢举升工艺研究。全面分析了三元复合驱过程中螺杆泵结垢的原因与机理，以及因结垢导致的螺杆泵井常见故障形式，认为结垢引起的螺杆泵定、/转子配合精度变差、摩擦特性不规则、磨损加剧等问题是螺杆泵井故障率急剧增加升高的主要原因。基于此，提出了包括螺杆泵定、/转子过盈量优化、设备材料表面改性和化学清、/防垢相结合的螺杆泵井综合防垢举升工艺技术对策。截至2010年底，螺杆泵井综合防垢举升工艺技术已先后在油田216口井中累计应用425井次，使应用此技术井的措施后螺杆泵运行寿命大大延长，由应用措施前的平均不足100 d延长至298 d，其中最长运行寿命达到1 370 d，取得了良好的应用效果。图11表5参13 Key words: alkaline-surfactant-polymer (ASP), artificial lift technology, progressing cavity pump (PCP), scaling, surface modification