适用于苛刻油藏聚合物驱的新型微生物多糖性能

Properties of novel microbial polysaccharides suitable for the polymer flooding of harsh oil reservoirs

周洪涛 罗海 吕奉章 安继彬 霍彤 马永伟

ZHOU Hongtao LUO Hai LYU Fengzhang AN Jibin HUO Tong MA Yongwei

中国石油大学(华东)石油工程学院 中国石油华北油田分公司

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China

针对广泛应用于聚合物驱的部分水解聚丙烯酰胺(HPAM)耐高温高矿化度性能较差的问题，探索了新型微生物多糖迪特胶、韦兰胶、黄原胶作为新型驱油用聚合物的可行性，研究了微生物多糖的浓度、温度、剪切速率、放置时间、碱浓度以及矿化度等因素对其黏度的影响，并对微生物多糖的驱油效果进行了评价，同时与HPAM进行了对比。实验证明：新型微生物多糖具有良好水溶性，其溶液黏度随浓度的增加而增加；溶液表现出良好的抗剪切性能和放置稳定性；与传统的HPAM溶液相比，微生物多糖溶液在耐温性、耐碱性和耐盐性等方面都有明显提高；微生物多糖驱油效果明显优于HPAM，因此，可以作为适用于苛刻油藏的新型驱油剂。

The partially hydrolyzed polyacrylamide (HPAM) which is extensively applied to polymer flooding is poorer in the resistance to high temperature and high salinity. To solve this problem, this paper explored the feasibility of taking the novel microbial polysaccharides (diutan gum, welan gum and xanthan gum) as the polymer for oil displacement. Then, the effects of the concentration, temperature, shear rate, storing time, alkali concentration and salinity of microbial polysaccharide on its viscosity were investigated. Finally, the oil displacement effect of microbial polysaccharides was evaluated and compared with that of HPAM. It is experimentally proved that these novel microbial polysaccharides are of good water solubility, and their solution viscosity increases with the concentration. The solution presents good shear resistance and storing stability. Compared with traditional HPAM solution, microbial polysaccharide solution is much better in temperature tolerance, alkali resistance and salt endurance. Microbial polysaccharides are obviously superior to HPAM in term of oil displacement effect. Therefore, microbial polysaccharides can be used as a novel oil displacement agent suitable for harsh oil reservoirs.

10.13639/j.odpt.2019.03.021