三元复合驱螺杆泵井中性清垢剂的研究与应用

Research and Application of Neutral Scale Remover for Screw Pump Wells of Alkali-surfactant-polymer Flooding

管公帅 王庆国 刘向斌 王 鑫

GUAN Gongshuai，WANG Qingguo，LIU Xiangbin，WANG Xin

为解决大庆油田三元复合驱螺杆泵井常规酸洗清垢后转子涂层脱落、泵漏失作业的问题，制备了由有机磷酸酯、分散剂、pH值调节剂等组成的中性清垢剂体系，研究了该中性清垢剂体系对转子涂层的腐蚀情况及对三元复合驱现场垢样的清垢效果，并在大庆油田进行了现场试验。结果表明，中性清垢剂可使坚硬、致密的垢块变为疏松、分散的粉末，现场应用时利用螺杆泵防砂举升原理，携带松散垢粒至地面，清垢过程无H+参与，螺杆泵转子镀铬涂层不会脱落。统计17口螺杆泵井中性清垢效果，措施后生产电流平均下降9.5 A，同时所有井均正常生产，无漏失情况发生，该中性清垢剂对三元复合驱结垢的螺杆泵井具有较好的清垢效果。图7表2参9

In order to solve the problem of rotor coating loss and pump leakage operation after conventional acid cleaning of screw pump wells in alkali-surfactant-polymer （ASP） flooding of daqing oilfield，a neutral scale removing agent composed of organophosphate，dispersant and pH regulator was prepared. The removing effect for the field scale sample and corrosion condition for the rotor coating was studied in lab，the cleaning test was applied on the screw pump wells of Daqing oilfield. The results showed that the hard and compact scale could be changed into loose and dispersed powder，because of the good sand-carrying performance of screw pump，the removed scale particles could be lifted to the ground effectively. Since there was no hydrogen ions in the scale remover，the chrome coating of screw pump wells will not be destroyed. According to the statistical results of the scale cleaning of 17 screw pump wells，the average production current of the production wells after the measures decreased by 9.5 A. The scales on the surfaces of the stator，rotor and sucker rods of the screw pump wells were effectively removed，and all the wells resume normal production. Application showed that neutral scale remover was effective for descaling downhole equipment of screw pump wells.

10.19346/j.cnki.1000-4092.2019.04.029