Study on the Feasibility of Nanofiltered Seawater Injection in Offshore Medium and Low Permeability Oilfields

doi:10.3969/j.issn.1006-6535.2023.02.020

Abstract

Abstract: To address the problem that the natural seawater as the injected water source damages the reservoir, the differences between the natural seawater and the nanofiltered seawater as the injected water were studied in terms of ionic composition of water samples, prediction of scaling tendency after mixing with the formation water, degree of scaling and core flow test to explore the feasibility of the nanofiltered seawater as the injected water source in offshore oilfields. The results of the study show that the content of scale forming ions such as Ca²⁺, Mg²⁺ and SO₄^2- in the nanofiltered seawater is significantly lower than that of the natural seawater; both the nanofiltered seawater and the natural seawater have scaling tendency after mixing with the formation water respectively, but the amount of scaling after the nanofiltered seawater is mixed with the formation water is significantly lower than that of the natural seawater, and the damage of the nanofiltered seawater as injected water to the liquid phase permeability of reservoir core is also significantly lower than that of the natural seawater. Therefore, the nanofiltered seawater as the injected water for offshore oil and gas fields is technically feasible. The results of the study provide a technical basis for the use of the nanofiltered seawater as the injected water in offshore oilfields.

Key words: water injection, compatibility, nanofiltered seawater, reservoir protection, offshore oilfield

CLC Number:

TE348

Wang Yuqi, Feng Hengzhi, Xing Xijin, Wang Qi, Yue Qiansheng. Study on the Feasibility of Nanofiltered Seawater Injection in Offshore Medium and Low Permeability Oilfields[J]. Special Oil & Gas Reservoirs, 2023, 30(2): 142-146.

References

[1] 刘佳,王舟洋,李尚洪,等.旅大27-2油田水源水与E₃dⅢ地层水配伍性研究[J].石油地质与工程,2013,27(4):142-144.
LIU Jia,WANG Zhouyang,LI Shanghong,et al.Study on the compatibility of source water and E₃dⅢ formation water in the Oilfield Lyuda 27-2[J].Petroleum Geology & Engineering,2013,27(4):142-144.
[2] 刘书杰,邢希金,林科雄.中东M油田高矿化度地层水结垢趋势预测与防垢实验研究[J].中国海上油气,2014,26(4):67-70,83.
LIU Shujie,XING Xijin,LIN Kexiong.Study on scaling tendency prediction and anti-scaling experiment for high salinity formation water of M Oilfield in the Middle East[J].China Offshore Oil and Gas,2014,26(4):67-70,83.
[3] 尚言武,成怀刚,王铎,等.海上油田注水纳滤软化中试研究[J].化工进展,2009,28(3):534-538.
SHANG Yanwu,CHENG Huaigang,WANG Duo,et al.A pilot study on seawater softening by UF-NF integrated technique[J].Chemical Industry and Engineering Progress,2009,28(3):534-538.
[4] 查吕应,丁志斌,曹传新.纳滤技术用于反渗透海水淡化预处理评述[J].工业用水与废水,2003,34(2):18-20.
ZHA Lyuying,DING Zhibin,CAO Chuanxin.Evaluation of application of nanofiltration technology in reverse-osmosis sea water desalination pre-treatment[J].Industrial Water & Wastewater,2003,34(2):18-20.
[5] 胡道友,马敬环,康雪婧,等.海水纳滤预处理的优化研究[J].工业水处理,2017,37(6):35-39.
HU Daoyou,MA Jinghuan,KANG Xuejing,et al.Research on the optimization of nanofiltration pretreatment of seawater[J].Industrial Water Treatment,2017,37(6):35-39.
[6] 苏保卫,王玉红,李晓明,等.胶州湾海水纳滤软化的研究[J].水处理技术,2007,33(2):64-66,85.
SU Baowei,WANG Yuhong,LI Xiaoming,et al.Seawater softening in Jiaozhou Bay by nanofiltration(nf) process[J].Technology of Water Treatment,2007,33(2):64-66,85.
[7] 郑雅梅,成怀刚,王铎,等.纳滤软化海水配制驱油聚丙烯酰胺溶液的研究[J].石油炼制与化工,2009,40(1):65-68.
ZHENG Yamei,CHENG Huaigang,WANG Duo,et al.Study on using seawater softened by nanofiltration to prepare polyacrylamide solution for oil displacement[J].China Petroleum Processing and Petrochemical Technology,2009,40(1):65-68.
[8] 马军,李鹏飞,刘红斌.海水纳滤系统脱盐性能研究[J].水处理技术,2020,46(8):29-33.
MA Jun,LI Pengfei,LIU Hongbin.Study on desalination performance of seawater by NT system[J].Technology of Water Treatment,2020,46(8):29-33.
[9] 国家能源局.油田水分析方法:SY/T 5523—2016[S].北京:石油工业出版社,2016:10-13,19-22.
National Energy Administration.Practice for analysis of oilfield waters:SY/T 5523—2016[S].Beijing:Petroleum Industry Press,2016:10-13,19-22.
[10] 赵立翠,高旺来,赵莉,等.罗52区地层水与注入水水质分析及结垢趋势预测[J].石油化工应用,2013,32(3):4-8.
ZHAO Licui,GAO Wanglai,ZHAO Li,et al.Analysis of the quality of formation water and injected water and prediction of scaling mechanism of Luo 52 Block[J].Petrochemical Industry Application,2013,32(3):4-8.
[11] 杨勇,李伟,唐放,等.考虑等效井网密度的南海东部水驱砂岩油藏采收率预测[J].大庆石油地质与开发,2022,41(4):67-73.
YANG Yong,LI Wei,TANG Fang,et al.Recovery prediction of waterflooding sandstone reservoir in eastern South China Sea considering effect of equivalent well pattern density[J].Petroleum Geology & Oilfield Development in Daqing,2022,41(4):67-73.
[12] 李黎,胡文丽,罗启源,等.非达西渗流效应对南海低渗透储层产能的影响[J].大庆石油地质与开发,2021,40(2):160-167.
LI Li,HU Wenli,LUO Qiyuan,et al.Impact of non-Darcy flow on the productivity of low permeability reservoirs in South China Sea[J].Petroleum Geology & Oilfield Development in Daqing,2021,40(2):160-167.
[13] 李华洋,吴惠梅,南冲,等.南海深水L-1井区地层压力预测技术研究及应用[J].石油地质与工程,2020,34(3):113-117.
LI Huayang,WU Huimei,NAN Chong,et al.Study and application of formation pressure prediction technology in deep water L-1 well area of south China sea[J].Petroleum Geology & Engineering,2020,34(3):113-117.
[14] 于俊峰,吴其林,晁彩霞,等.南海常压与超压气水过渡带岩电特征与气藏结构[J].断块油气田,2021,28(4):504-508.
YU Junfeng,WU Qilin,CHAO Caixia,et al.Petroelectric characteristics and gas reservoir structure of the gas-water transition zone between normal pressure and overpressure in the South China Sea[J].Fault-Block Oil & Gas Field,2021,28(4):504-508.
[15] 田兵,郑有伟,赵俊梅.南海白云凹陷渐新统珠海组沉积相及其演化[J].断块油气田,2022,29(6):800-806,836.
TIAN Bing,ZHENG Youwei,ZHAO Junmei.Sedimentary facies and evolution of Oligocene Zhuhai Formation in Baiyun Sag,South China Sea[J].Fault-Block Oil & Gas Field,2022,29(6):800-806,836.
[16] 石磊,冯进,刘道理,等.南海东部地区古近系测压资料流度校正与渗透率升尺度转换模型[J].油气地质与采收率,2022,29(2):46-52.
SHI Lei,FENG Jin,LIU Daoli,et al.Mobility correction and upscaling permeability conversion model of Paleogene pressure measurement data in eastern South China Sea[J].Petroleum Geology and Recovery Efficiency,2022,29(2):46-52.
[17] 国家能源局.油田水结垢趋势预测方法:SY/T 0600—2016[S].北京:石油工业出版社,2017:2-4.
National Energy Administration.Prediction method for scaling tendency of oilfield water:SY/T 0600-2016[S].Beijing:Petroleum Industry Press,2017:2-4.
[18] 李露,苏立永,邵天宝,等.纳滤技术在海水淡化中的应用实验研究[J].水处理技术,2016,42(12):89-91,95.
LI Lu,SU Liyong,SHAO Tianbao,et al.Experimental study of nanofiltration technology in seawater desalination[J].Technology of Water Treatment,2016,42(12):89-91,95.
[19] 李露,赵河立,邵天宝.纳滤技术在海水淡化中的应用实验研究[J].水处理技术,2015,41(10):100-103,126.
LI Lu,ZHAO Heli,SHAO Tianbao.Experimental study of nanofiltration technology in seawater desalination[J].Technology of Water Treatment,2015,41(10):100-103,126.