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以聚丙烯酰胺HPAM/Cr~(3+)为例研究了影响弱凝胶体系成胶规律的因素。聚合物的生产工艺或杂质含量对体系的成胶影响很大;提高聚合物浓度、降低聚合物/交联剂质量比,有利于提高体系的成胶速度和成胶强度;适当的矿化度可促进聚合物体系的交联;在45～75℃范围内体系在一定条件下均能稳定成胶;弱凝胶具有一定耐低速剪切能力。用大庆助剂厂生产的聚合物,在聚合物浓度为400 mg/L、聚合物/交联剂质量比为20:1、体系矿化度为2000 mg/L、地层温度为65℃的条件下,可形成弱凝胶。
Taking Polyacrylamide HPAM / Cr ~ (3 +) as an example, the factors influencing gelation of weak gel system were studied. Polymer production process or impurity content of the system has a significant impact on the plasticity; to improve the polymer concentration and reduce the mass ratio of polymer / crosslinking agent is conducive to improving the system of plasticizing speed and gel strength; appropriate salinity Can promote the cross-linking of the polymer system; in the range of 45 ~ 75 ℃ under certain conditions, the system can stabilize the gel; weak gel has a certain resistance to low shear capacity. The polymer produced by Daqing Auxiliary Plant was used under the conditions of polymer concentration of 400 mg / L, polymer / crosslinker mass ratio of 20: 1, system salinity of 2000 mg / L and formation temperature of 65 ℃ Under, can form a weak gel.