改性氧化石墨烯纳米片用于海上B油田提高采收率*

Research on Enhanced Oil Recovery of Modified Graphene Oxide Nanosheet for Offshore B Oilfield

李 奇 陈士佳 陈 斌 王成胜 张军辉 张 强 吴晓燕

LI Qi CHEN Shijia CHEN Bin WANG Chengsheng ZHANG Junhui ZHANG Qiang WU Xiaoyan

改性氧化石墨烯纳米片是一种基于氧化石墨烯改性的新型纳米材料。本文研究了改性氧化石墨烯纳米片 的尺寸和形貌，并考察了改性氧化石墨烯纳米片与聚合物二元增效体系的油/水界面张力、乳化性能、黏浓关系、 流变性能和驱油性能。研究结果表明，所用的改性氧化石墨烯纳米片的典型尺寸为217.7 nm，在水溶液中呈片 状松散堆积。改性氧化石墨烯纳米片体系及其与聚合物的二元增效体系均能在改性氧化石墨烯加量为10 mg/L 的极低浓度下使油水界面张力降至10-3 mN/m数量级，且在加量为50 mg/L的极低浓度下可使油水界面张力降至 10-4 mN/m数量级，表明改性氧化石墨烯纳米片具有较高的活性，能在油水界面上均匀分布。改性氧化石墨烯纳 米片具有一定的乳化能力，无论是否存在聚合物的情况下，乳化液的油水分离时间均随改性氧化石墨烯纳米片 加量的增大而延长。改性氧化石墨烯纳米片与聚合物通过氢键和静电相互作用，加入100 mg/L的改性氧化石墨 烯纳米片可使聚合物溶液的增黏率达60%以上。在水驱基础上改性氧化石墨烯纳米片与聚合物二元增效体系 可使采收率提高26.25%。

Modified graphene oxide nanosheets（MGONS）is a newly developed nanomaterial based on graphene oxides for EOR applications. The size and morphology of the modified graphene oxide nanosheet was examined，the oil/water interfacial tension， emulsifying properties，viscosity，rheological properties of the MGONS/polymer system was performed and the core flooding test was carried out. The results showed that the MGONS had a typical size of 217.7 nm and piled up loosely in the aqueous solution. No matter the MGONS solution or MGONS/polymer mixed system，with a very low concentration of 10 mg/L of MGONS，they could reduce the interfacial tension to 10-3 mN/m，while the concentration of MGONS was of 50 mg/L，the interfacial tension was 10-4 mN/m， exhibiting higher activity and the ability to uniformly distribute at the oil/water interface. The water-oil separation time prolonged with the increase of the concentration of MGONS，whether there was polymer or not，indicating that MGONS had a certain emulsifying ability. The MGONS interacted with polymer through hydrogen bond and static interaction. After adding 100 mg/L of MGONS，the viscosity of polymer solution could be increased by 60%. The core flooding test result revealed that the MGONS/ polymer mixture system could enhance oil recovery efficiency by 26.25% based on water flooding.

10.19346/j.cnki.1000-4092.2021.04.017