复合交联聚合物弱凝胶体系的研制与性能评价

Development and property evaluation of compound cross-linking polymer weak gel system

赖南君 闻一平 傅波 徐俊芳 王思遥 王爱香

LAI Nanjun WEN Yiping FU Bo XU Junfang WANG Siyao WANG Aixiang

西南石油大学化学化工学院，四川成都　610500 长庆油田公司第三采油厂，宁夏银川　750006 川庆钻探工程有限公司长庆井下技术作业公司，陕西西安　710018 华北油田公司，河北任丘　062552

Chemistry and Chemical Engineering Institute of Southwest Petroleum University, Chengdu 610500, China No.3 Oil Production Plant of Changqing Oilfield Company, CNPC, Yinchuan 750006, China Downhole Service Company of Chuanqing Drilling Engineering Company Limited, CNPC, Xi’an 710018, China Huabei Oilfield Company, Renqiu, 062552, China

由于弱凝胶调驱体系抗剪切性能弱而限制了其在油藏中的应用，以共聚物丙烯酰胺/ 丙烯酸/N- 乙烯基吡咯烷酮为主剂，加入甲醛– 苯酚复合交联剂和高温稳定剂，制备了调驱性能较好的弱凝胶体系。考察了聚合物质量浓度、稳定剂质量浓度、交联剂/ 聚合物质量比、交联剂配制摩尔比、温度、pH 值以及矿化度对成胶性能的影响。确定了弱凝胶体系的最佳使用条件： 聚合物AM/AA/NVP 质量浓度2 000 mg/L，交联剂/ 聚合物质量比2/1 000，交联剂（甲醛/ 苯酚）摩尔比4∶1，稳定剂（硫脲）质量浓度100 mg/L，pH 值为7，温度60 ℃。室内调驱性能评价表明，该体系具有良好的抗剪切性能，黏度保留率达到91.38%，同时封堵率在99% 以上，突破压力大于7 MPa，并且还具有一定的选择封堵能力，剖面改善率达到80% 以上。

The weak shear resistance of weak gel profile controlling and flooding system limits its application in reservoirs, we prepared a weak gel system with favorable profile controlling and flooding performance with AM/AA/NVP as the main agent and added Phenol–formaldehyde as cross-linking agent and temperature stabilizer. We studied the effects of polymer concentration, stabilizer concentration, crosslinker/polymer proportion, crosslinker concentration, temperature, pH and salinity on the gelling property. The optimum conditions for preparing the weak gel system were identified as follows: concentration of polymer (AM/AA/NVP): 2 000 mg/L; mass ratio of crosslinker/polymer: 2/1 000; proportion of crosslinker (formaldehyde/phenol): 4∶1; concentration of stabilizer: 100 mg/L; pH of the system: 7; and suitable temperature 60 ℃. The in-house evaluation on profile controlling and flooding performance shows that the system has good shear resistance, its viscosity retention rate is up to 91.38%, and its plugging rate is above 99%, its breakthrough pressure is greater than 7 MPa and has certain selective plugging capability, and the sectional improvement rate is over 80%.

10.13639/j.odpt.2014.03.022