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蒲万芬,杨浩. 注入时机对低矿化度表面活性剂驱油的影响[J]. 科学技术与工程, 2020, 20(1): 170-174.
PU Wan-fen,YANG Hao.Research on the Impact of Injection Occasion on Low Salinity Surfactant Flooding[J].Science Technology and Engineering,2020,20(1):170-174.
注入时机对低矿化度表面活性剂驱油的影响
Research on the Impact of Injection Occasion on Low Salinity Surfactant Flooding
投稿时间:2019-05-14  修订日期:2019-09-22
DOI:
中文关键词:  低矿化度表面活性剂 采收率 含水率 注入压力 降压率
英文关键词:low salinity surfactant  oil recovery  water cut  injection pressure  pressure reduction rate
基金项目:
     
作者单位
蒲万芬 西南石油大学油气藏地质及开发工程国家重点实验室
杨浩 西南石油大学油气藏地质及开发工程国家重点实验室
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中文摘要:
      近些年来,针对低矿化度水为注入液的岩心驱替实验结果表明,低矿化度水有一定程度提高采收率的作用。而低矿化度表面活性剂(LSS)注入时机对驱油的影响没有研究,这里将低矿化水与表面活性剂结合进行岩心驱替实验。选择阴离子表面活性剂在2000mg/L NaCl的低盐度环境下获得较低的油水界面张力(IFT)。实验结果表明,注入时机对采收率、含水率、注入压力及降压率影响都较大。注入时机越早,最终采收率越高,当高矿化度水驱至含水率为60.5%、81.5%、98.1%后转注LSS驱,采收率增值为38.9%、25.3%、15.7%,最终采收率为74.3%、67.8%、65.1%,不同注入时机最终采收率的最大差值9.2%;而注入时机越早降压率越低,降压率最大差值33.1%;LSS驱采油速度高于低矿化度水驱,缩短了驱油时间。
英文摘要:
      In recent years, the results of core flooding experiments with low salinity water as injection fluid show that low salinity water has a certain degree of enhanced oil recovery. However, the effect of the low salinity surfactant (LSS) injection occasion on the oil displacement has not been studied. Here, the low salinity water was combined with surfactant to carry out the core flooding experiment. The anionic surfactant was chosen to achieve a lower oil-water interfacial tension (IFT) in a low salinity environment of 2000 mg/L NaCl. The experimental results show that the injection occasion has a great influence on the oil recovery, water cut, injection pressure and pressure reduction rate. The earlier the injection occasion, the higher the ultimate oil recovery. When the high salinity water flooding reaches the water cut of 60.5%, 81.5%, 98.1%, the LSS flooding will increase the oil recovery by 38.9%, 25.3%, 15.7%, and the final oil recovery was 74.3%, 67.8%, 65.1%, respcetively. The maximum difference of the final oil recovery of different injection occasion is 9.2%. The earlier the injection occasion, the lower the pressure reduction rate, and the maximum difference in the pressure reduction rate is 33.1%. The oil recovery of LSS flooding is higher than low salinity water flooding, which shortens the oil displacement time.
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