新型表面活性驱油聚合物GL的研究

Characteristics of the Novel Copolymer with Surface Activity for EOR

许星光 欧阳坚 朱卓岩 王 凤 王源源

XU Xing-Guang OUYANG Jian ZHU Zhuo-Yan WANG Feng WANG Yuan-Yuan

针对油田现有聚合物抗盐性差并且难以提高洗油效率的问题，合成了一种具有表面活性的耐盐型驱油剂GL，考察了它在大庆特定油藏条件下的溶液性质。研究表明：在温度45℃、矿化度2400 mg/L、浓度在250～1500 mg/L范围内，GL溶液的表观黏度均高于油田现阶段常用的HPAM溶液的。在温度45℃、浓度1000 mg/L下，二者溶液的黏度均随着矿化度的增加而降低，但GL溶液的黏度始终比HPAM高20 mPa·s左右；浓度为1000 mg/L的 GL溶液与原油形成的乳状液稳定时的析水率较低，为50%左右，而HPAM在相同条件下与原油形成乳状液的析水率达到95%。相同浓度(1000 mg?L-1)或者相同黏度(62 mPa·s)的两种溶液岩心驱替实验结果表明，GL溶液驱的采收率分别比HPAM溶液驱的高4.0%和2.6%。

In the light of poor salt tolerance and difficulty to improve washing oil efficiency of the polymers used in oil fields, a kind of salt tolerance copolymer with surface activity，called GL, was synthesized and the characteristics of GL were evaluated under specific reservoir condition of Daqing oil field. The results demonstrated that, when the solution concentrations were between 250 mg/L and 1500 mg/L and the salinity was 2400 mg/L and the temperature were 45℃, the viscosity of GL solutions were higher than that of HPAM solutions. Although the viscosity of the two kinds of polymer solutions at the concentration of 1000 mg/L decreased with the increase of the salinity, the viscosity of GL solution was almost 20 mPa·s higher than that of HPAM solution. The water separation ratio of the emulsion obtained with GL solution at the concentration of 1000 mg/L and the crude oil was lower, being of about 50%, while that of HPAM solution at the same concentration reached 95% quickly. The oil displacement experiment results indicated that based on the water flood, the oil recovery of the GL solution was 4.0% higher than that of HPAM solution at the same concentration (1000 mg/L); the oil recovery of the GL solution with 2.6% higher than that of HPAM solution at the same viscosity (62 mPa·s )with same viscosity.