氨基酸型表面活性剂用于提高原油采收率

N-Alkyl-β-aminopropionate Surfactant/Polymer Flooding Fluid for EOR

报道了由脂肪胺和丙烯酸甲酯合成的N-长链烷基-β-氨基丙酸（AAPZ）的界面活性、放置稳定性和驱油性能,实验温度45℃。小试、中试、规模生产的AAPZ在大庆采油四厂回注污水中的3.0和0.5 g/L溶液,在加入或不加2.0 g/L HPAM或抗盐聚合物时,与黏度10 mPa.s的大庆采油四厂模拟原油间的界面张力均达到10-3mN/m超低值,且至少维持220天。在均质人造砂岩岩心上,在水驱之后分别注入0.35 PV AAPZ（5.0 g/L）/抗盐聚合物（3.0g/L）二元体系或NaOH（10）/ORS-41（3.0）抗盐聚合物（3.0）三元体系,采收率增值分别为23.1%和19.9%。在人造非均质大岩心上,按水驱-聚驱-AAPZ/抗盐聚合物二元驱-聚驱-水驱的程序驱油,改变前置HPAM段塞尺寸（0.1-0.725PV）,注入0.21-0.348 PV AAPZ（3.0）/抗盐聚合物（2.0）主段塞时,水驱后采收率增值差别很小,在29.2%-30.6%范围,而主段塞中抗盐聚合物浓度为1.5和1.0 g/L时,水驱后采收率增值分别为最高（31.7%）和最低（25.6%）。该二元体系的岩心注入压力,明显低于相同浓度的聚合物溶液。

The interfacial activity,long term stability,and oil displacement capability were investigated at 45℃ for N-alkyl-β-aminopropionate,prepared from long chain aliphatic amine（s） and methyl acrylate and notated as AAPZ in this paper.The interfacial tension between 0.5 and 3.0 g/L solution of laboratory,pilot and batch size AAPZ samples in recycled produced water and simulation oil with viscosity 10 mPa·s of the 4th Daqing production factory reached and kept at least in 220 days ultralow values of magnitude 10-3 mN/m.On artificial homogeneous sandstone cores after water flood finished,0.35 PV of AAPZ（5.0 g/L）/salt tolerant polymer（STP,3.0 g/L） solution or NaOH（10.0）/ORS-41（3.0）/STP（3.0）solution was injected to give an extremal enhancement in oil recovery of 23.1% or 19.9%,respectively.On enlarged artificial heterogeneous sandstone cores a series of oil displacement experiments were performed according to a injecting procedure of water-polymer-AAPZ/STP solution-polymer-water and it was shown that injecting 0.21—0.348 PV of AAPZ（3.0）/STP（2.0） solution as main slug after HPAM polymer prepad of various size 0.1—0.725 PV injected led to a more or less steady value of EiOR in range 29.2—30.6% against water flood oil recovery and the highest and the lowest value of EiOR,31.7% and 25.6%,were observed at STP concentration in the main slug of 1.5 and 1.0 g/L,respectively.The injection pressure of AAPZ/STP solution was significantly lower than that of polymer solution of equal polymer concentration.