摘要
针对GY油田裂缝性低渗低温高矿化度的油藏特征,以三氯化铬、氢氧化钠、乙酸、胡萝卜酸为原料合成交联剂JL-1。以成胶时间和成胶强度为评价指标,通过筛选聚合物(HPAM)相对分子质量以及HPAM、JL-1浓度,得到低温高矿化度油藏弱凝胶调驱体系KY-1,并测定KY-1体系的抗盐性和耐剪切性,对KY-1体系封堵驱油效果进行评价。结果表明,适用于GY油田KY-1弱凝胶调驱体系的最佳配方为:T114油区地层水+3000 mg/L HPAM(M=1400×10~4)+500mg/LJL-1。地层水矿化度为40g/L时,弱凝胶体系在60h内迅速成胶,成胶黏度达30Pa·s,耐盐性较好。在剪切速度200 s^(-1)、27℃条件下剪切120 min后,体系成胶黏度为25600 mPa·s,成胶黏度损失率为18.99%,抗剪切性较好。对裂缝性岩心的平均封堵率为88.7%,采收率增幅平均值为12.1%。
Aimed at the low temperature and high salinity condition of low permeability fractured reservoir in GY oilfield, the crosslinker JL-1 was synthesized by three chromium chloride, sodium hydroxide, acetic acid and daucic acid. Then with gelling time and gel strength as evaluation indexes, a weak gel profile control system KY-1 in low temperature and high salinity reservoirs was prepared by regulating the relative molecular mass of polymer （HPAM） and the concentration of HPAM and JL-1. The performance of salt tolerance and shear resistance of KY-1 was investigated, and the plugging capacity and oil displacement efficiency of KY-1 was estimated. The results showed that the best formula of KY-1 weak gel flooding system which was applied to GY oil field was： T114 oil formation water, 3000 mg/L HPAM （M= 1400 x 10^4） and 500 mg/L JL-1. When the salinity of formation water was 40 g/L, the weak gel system could gelatinize rapidly in 60 hrs with 30 Pa. s gel strength and good salt tolerance. The system also had good sheering tolerance. The gel strength of system was 25600 mPa. s and the gel viscosity loss rate was 18.99% after 120 min sheering at 200 S-l, 27℃. The stemming ratio of fxactured cores in average was 88.7%, and average enhanced oil recovery rate was 12.1%.
出处
《油田化学》
CAS
CSCD
北大核心
2013年第4期517-520,共4页
Oilfield Chemistry
基金
国家自然科学基金"低渗油藏低频振动辅助表面活性剂复合驱油机理研究"(项目编号51274229)
关键词
低渗
低温
高矿化度
弱凝胶
延长油田
low pertrability
low temperature
high salinity
weak gel
Yanchang oil fields
作者简介
杨红斌（1987-），男，中国石油大学北京）油气田开发工程专业在读博士研究生（2013-），从事三次采油提高采收率方面的研究，通讯地址：102249北京市昌平区中国石油大学北京）提高采收率研究院，E-mail：yhb0810@126．COm。
