摘要
近年来,玛湖油田多口油井在生产过程中均出现管壁结垢现象,导致井筒堵塞,严重影响了生产效果。研究了玛湖油田垢物的结构与组成;采用OLI-ScaleChem模拟方法,研究流体与岩石基质的作用,探究了垢物的形成机理。结果表明,油井的垢物主要为CaCO_(3),且井深越大,其结垢量越大;井筒的温度、压力以及流体的pH对结垢均有一定的影响;CaCO_(3)垢物是酸性入井流体条件下高矿化度流体与富钙岩石矿物的反应产物,其在聚合物作用下成球,进而堵塞孔缝和井筒。研究结果对油田后续结垢预防措施和处理措施的提出具有重要的指导意义。
In recent years,many oil wells in Mahu oil fields have experienced scaling on the pipe wall,which leads to wellbore blockage and seriously affects the production effect.In this paper,the structure and composition of scale in Mahu oilfield were studied,and the mechanism of scale formation was investigated by using OLI-ScaleChem simulation method and the interaction experiments between fluid and rock matrix.The results show that the main fouling is CaCO_(3),and the deeper the well is,the larger the amount of scale is.In addition,the wellbore temperature,pressure and pH of the fluid all have certain influence on scaling.According to the results of fluid rock reaction,it is inferred that CaCO_(3) scale is the reaction product of highly mineralized fluid and calcium-rich minerals under the condition of acidic well fluid,and forms into balls under the action of polymer,resulting in hole and wellbore plugging.The results of the study are of great significance in guiding the proposal of subsequent scaling prevention and treatment measures in the oilfield.
作者
周浩
龚喜刚
唐红娇
刘欢
时凤
张娟
杨磊磊
ZHOU Hao;GONG Xigang;TANG Hongjiao;LIU Huan;SHI Feng;ZHANG Juan;YANG Leilei(Research Institute of Exploration and Development,Xinjiang Oilfield Compony,CNPC,Karamay Xinjiang 834000,China;Xinjiang Laboratory of Petroleum Reserve in Conglomerate,Karamay Xinjiang 834000,China;Unconventional Petroleum Research Institute,China University of Petroleum(Beijing),Beijing 102249,China)
出处
《石油化工高等学校学报》
CAS
2024年第4期18-24,共7页
Journal of Petrochemical Universities
基金
新疆砾岩油藏实验室开发性项目(2020D04045)。
