摘要
针对油田沥青质井筒沉积问题,开展了生产参数对沥青质井筒析出影响规律研究,研究中采用了压差法,高温高压条件下测定温度、油气比、流速等对沥青质析出压力与再溶解的临界压力的变化规律。研究结果表明,沥青质析出压力(p_(onset))与温度成反比,而沥青质再溶解的临界压力(p_(red))与温度成正比;温度一定,沥青质析出压力(p_(onset))随着油气比增大而增大,即原油中溶解气体量大,沥青质沉积的趋势增大;油气比和温度一定时,流速变化对沥青质的析出压力和再溶解压力几乎没有影响。
This study investigated the influence of production parameters on asphaltene precipitation regularity under the conditionsof high temperature and high pressure and evaluated the influence of temperature,GOR(gas-oil ratio),and flow velocityon asphaltene precipitation in wellbores.The results showed that the pressure of asphaltene precipitation(ponset)was inverse totemperature and the pressure of asphaltene redissolving(pred)was proportionate to temperature.ponset was proportionate to theGOR at a certain temperature because the dissolved gases in the oil increased when the GOR improved and may have causedasphaltene precipitation.ponset and pred were not influenced by flow velocity in certain GOR and temperature ranges.Thisstudy demonstrated how asphaltene precipitation regularity can be controlled to decrease the risk of asphaltene precipitation inwellbores.
作者
吴川
张汝生
张祖国
佘跃惠
吴正彬
WU Chuan;ZHANG Rusheng;ZHANG Zuguo;SHE Yuehui;WU Zhengbin(Petroleum Exploration and Production Research Institute, SINOPEC, Haidian, Beijing 100083, China;College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, Hubei 434023, China;College of Petroleum Engineering, China University of Petmleum(Beijing), Changping, Beijing 102249, China)
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2017年第2期172-178,共7页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家科技重大专项(2011ZX05031-003-004)
中国石化科技部攻关项目(P15128)
中国石化重大科技项目(ZDP17005)
关键词
沥青质
析出规律
温度
油气比
流速
asphaltene
precipitation regularity
temperature
GOR
flow velocity
