金属离子屏蔽剂对HPAM溶液的增黏作用

Viscosity Increasing Effect of the Metal Ions Screening Agents on HAPM Solution

宋 华[] 宋莹莹 陈彦广 柳艳修 齐保坤 李丹丹

SONG Hua SONG Ying-Ying CHEN Yan-Guang LIU Yan-Xiu Qi Bao-Kun LIDan-Kun LI Dan-Dan

目前大庆油田采用的是清水配制母液污水稀释注入的工艺，由于采油污水中的金属离子含量高，污水稀释对HPAM溶液的黏度及驱油效果造成了不利的影响，故需要对污水进行处理。本文考察了三乙醇胺、HEDP、柠檬酸、焦磷酸钠对HPAM溶液的增黏性能，复配出既能提高HPAM溶液初始黏度、又能使黏度保持相对稳定的金属离子屏蔽剂SY（三乙醇胺、HEDP、柠檬酸、焦磷酸钠、其他助剂（包括除氧剂亚硫酸钠和絮凝剂十二水硫酸铝铵，质量比1:1）按质量比100：60：60：300：150），并分析了其增黏作用机理。用大庆采油五厂污水进行试验发现，当屏蔽剂SY加量为400 mg/L时，对浓度为2000 mg/L的HPAM溶液的增黏效果明显，与未投用屏蔽剂SY时相比，HPAM溶液黏度提高了28.4 mPa·s，增黏率为43.5%；放置40 d后，加入屏蔽剂SY的HPAM溶液的黏度比未投用屏蔽剂SY的HPAM溶液的高27 mPa·s，保黏率高出19.5%。

At present, the preparation injection technology used in Daqing Oilfield is that polymer solution is prepared with fresh water and then diluted by oil produced water. Oil produced water dilution has a bad influence on the viscosity of polymer solution and flooding effect because of the higher salinity and unqualified water. Use triethanolamine, HEDP, citric acid, sodium pyrophosphate as metal ions screening agent, the performance of increasing viscosity of HPAM solution was studied, as a result, the optimal water-quality-modification treatment agent SY which could increase the initial viscosity and stabilize the higher initial viscosity was developed by mixing triethanolamine, HEDP, citric acid, sodium pyrophosphate and the other additive in mass ratio of 100:60:60:300:150. The results showed that SY has a good viscosity-increasing ability. The viscosity of the HPAM solution prepared with water treated by screening agent SY increased by 28.4 mPa·s, and the viscosity increasing rate reached 43.5%, compared with HPAM solution prepared with water of Daqing Oilfield untreated. After 40 days, the viscosity of the HPAM solution increased by 27 mPa·s, and the viscosity mataining rate increased by 19.53%, compared with HPAM solution prepared with water of Daqing Oilfield untreated. In addition, the mechanisms were analyzed.