Abstract: The injection solution of ASP flooding in X12 area reacts with formation minerals to form scales, and then precipitates from the produced fluid and accumulates in the produced wells, which is easy to cause scaling and affect production. Through the analysis of scale sample, the main components of scale are defined, and the scaling regularity is studied. The purpose of cleaning and preventing scale in production wells is realized by using open scale prevention pump, pre⁃scaling process pipe string and dropping dosing measures. The results show that carbonate scale is the main scale component of weak alkali ASP flooding in X12 area, accounting for more than 78% of the scale sample quality; with the ASP injection, the vale of CO〖_(3)^(2-)〗 and pH increase gradually, while changes of Ca〖^(2+)〗+Mg〖^(2+)〗+Ba〖^(2+)〗 show the shape of curve of "rising⁃stabilizing⁃falling"; the scale mainly occurs after the ASP injection of 0.23 PV, and the concentration of CO〖_(3)^(2-)〗exceeds 140 mg/L. From the right shoulder of the⁃type concentration line of Ca〖^(2+)〗+Mg〖^(2+)〗+Ba〖^(2+)〗 above pH 8.3, the descending range of 0~15% is gradually accelerated; a set of underground surface scale prevention measures is formed by putting open scale prevention card pump at the extraction end, adopting pre⁃scaling process pipe string, and installing drip dosing device in the fouling well, with an average period of 167 days prolonged. And a set of underground surface scale⁃proof technical system was formed. The research has certain guiding significance for the development of combined flooding and scaling prevention technology.

Key words: ASP, Anti?scaling, Pump, String, Dosing

摘要： X12区三元复合驱注入溶液与地层矿物反应成垢后，从采出液析出，在采出井中聚积，容易造成垢卡，影响生产。通过垢样分析，明确垢质主要成分，对其结垢规律进行研究，通过应用敞口式防垢卡泵、预结垢工艺管柱、点滴加药措施，实现采出井清防垢目的。研究表明，X12区弱碱三元复合驱垢质成分主要以碳酸垢为主，占垢样质量78%以上；随三元体系注入，CO〖_(3)^(2-)〗质量浓度、pH逐渐上升，而Ca〖^(2+)〗+Mg〖^(2+)〗+Ba〖^(2+)〗质量浓度变化呈“升⁃稳⁃降”的Ω曲线形状；结垢主要发生在三元体系注入量0.23 PV左右、CO〖_(3)^(2-)〗质量浓度超过140 mg/L以上、pH8.3以上，自Ca〖^(2+)〗+Mg〖^(2+)〗+Ba〖^(2+)〗的Ω型质量浓度线右上角开始，降幅0到15%逐渐加快；通过采出端下入敞口式防垢卡泵、采用预结垢工艺管柱、见垢井安装点滴加药装置的措施，平均检泵周期延长167 d，形成了一套地下地面防垢技术体系。该研究对复合驱清防垢技术的开展具有一定指导意义。

关键词: 复合驱, 防垢, 泵, 管柱, 加药