采出污水配制聚合物溶液的影响因素研究

研究了聚合物驱采出污水中Na+、K+、Ca2+、Mg2+、Fe2+、Fe3+六种离子对聚合物溶液初始黏度的影响和溶解氧、阳离子、粘土矿物以及细菌对其稳定性的影响程度，提出了采出污水配注聚合物的参考控制指标和限度。研究结果表明，高价金属阳离子是影响聚合物水溶液初始黏度的主要因素，其由大到小的顺序为Fe2+＞Fe3+＞Mg2+＞Ca2+＞Na+＞K+。配制用水的基本要求是不含铁离子，Ca2+离子含量控制在200mg/L以下，最好控制在50mg/L以下；Mg2+离子含量控制在100mg/L以下，最好控制在30mg/L以下；Na+、K+离子含量应该控制在2000mg/L以下，最好控制在500mg/L以下。高价金属离子和溶解氧是影响聚合物溶液黏度稳定性的主要因素，其由大到小的顺序为：Fe2+>Mg2+(Ca2+)>Fe3+>Na+(K+)，一价阳离子和悬浮物对聚合物溶液黏度稳定性也有一定影响，细菌对其影响相对较小。

THE RESEARCH ON INFLUENCE FACTOR OF THE PREPARATION OF POLYMER SOLUTION WITH PRODUCED WATER

The consultation index and limitation of produced water quality is provided to oilfield by researching on the influence of Na+，K+，Ca2+，Mg2+，Fe2+，Fe3+ cations and the initial viscosity.And the factor analysis of the influence of polymer solution stability is carried out including dissolution oxygen，cation，clay mineral and bacterium.The cation content is major factor influencing initial viscosity，the order being Fe2+＞Fe3+＞Mg2+＞Ca2+＞Na+＞K+.When polymer solution is prepared，the basic requirement of produced water is none Fe2+ and Fe3+，and Ca2+ content is under 200mg/L with the optimal value of 50mg/L，Mg2+ content under 100mg/L with the optimal value of 30mg/L，Na+，K+ content under 2000mg/L with the optimal value of 500 mg/L.Dissolution oxygen and high valence cations are major factors influencing polymer solution stability，the order being Fe2+>Mg2+（Ca2+）>Fe3+>Na+（K+）.One band valence bond cation and suspension influence polymer solution stability to a certain degree.The influence of bacterium is relative small.Oxidation-reduction reaction is maximum influence on polymer solution stability.