Zhang Chengli, Wang Peng, Song Guoliang
College of Petroleum Engineering, Northeast Petroleum University, Daqing, Heilongjiang 163318, China.
College of Mathematics and Statistics, Northeast Petroleum University, Daqing, Heilongjiang 163318, China.
Int J Anal Chem. 2018 Dec 18;2018:9653953. doi: 10.1155/2018/9653953. eCollection 2018.
Based on the properties of high temperature and salinity reservoir, the water-soluble polymer with good heat resistance and salt tolerance can be obtained through copolymerization between 2-acrylamide-2-methyl sulfonate monomer (AMPSN) and acrylamide monomer (AM) in water. The star shaped stable complexes (STARPAM) with the star nucleus of -CD are prepared by living radical polymerization, which can improve the viscosity and change the percolation characteristics of the polymer in porous media. In the article, the performance of the STARPAM (star-shaped polymer) with heat resistance and salt tolerance was evaluated by comparing the viscosification property, heat and salt resistance, calcium and magnesium tolerance, and long-term thermal stability of STARPAM (star-shaped polymer) with those of HPAM (partially hydrolyzed polyacrylamide) and MO-4000 (linear polymer). The results of physical simulation experiment showed that the viscosity of the STARPAM is 3.3 times that of MO-4000 and 4 times that of HPAM under the conditions of mineralization degree of 20000 mg/L, concentration of 1500 mg/L, and 75°C, which indicated that heat resistance and salt tolerance of the STARPAM are excellent. Oil displacement experiments showed that STARPAM can enhance oil recovery by 20.53% after water flooding, and the effect of oil displacement is excellent. At present, 19 wells were effective with a ratio of 95.2%. Compared with before treatment, the daily liquid production increased by 136 m, daily oil production increased by 44.6 t, water cut decreased by 4.67 percentage points, and flow pressure decreased by 1.15 MPa.
基于高温高盐油藏的特性，通过2-丙烯酰胺-2-甲基磺酸钠单体（AMPSN）与丙烯酰胺单体（AM）在水中共聚，可得到具有良好耐热性和耐盐性的水溶性聚合物。采用活性自由基聚合法制备了以β-环糊精为星核的星形稳定络合物（STARPAM），该络合物可提高聚合物在多孔介质中的黏度并改变其渗流特性。本文通过比较STARPAM（星形聚合物）与部分水解聚丙烯酰胺（HPAM）和MO-4000（线性聚合物）的增黏性能、抗温抗盐性能、抗钙镁性能及长期热稳定性，对具有耐热性和耐盐性的STARPAM（星形聚合物）性能进行了评价。物理模拟实验结果表明，在矿化度为20000 mg/L、浓度为1500 mg/L、温度为75℃的条件下，STARPAM的黏度是MO-4000的3.3倍，是HPAM的4倍，这表明STARPAM具有优异的耐热性和耐盐性。驱油实验表明，水驱后STARPAM可提高采收率20.53%，驱油效果良好。目前，19口井见效，有效率为95.2%。与处理前相比，日液量增加136 m，日产油量增加44.6 t，含水率下降4.67个百分点，流压下降1.15 MPa。
