Adsorption of Calcium and Magnesium Ions and Thickening Effect

Abstract

Waste water rich in high-concentration Ca 2+ 、Mg 2+ in a block of Daqing Oilfield, the influence of Ca 2+ and Mg 2+ on polymer solution viscosity is considered. To use of sodium humate solution which compound by turf and NaOH complexed Ca 2+ and Mg 2+ , reduced the impact of Ca 2+ and Mg 2+ on the polymer solution viscosity, so reached oilfield reinjection water viscosity standards. Research show that polymer solution viscosity lossed seriously when Ca 2+ and Mg 2+ content in 0 ~ 200mg / L, viscosity loss rate reached maximum 63.2% and 70.7%, respectively. The adsorption ratio of Ca 2+ reached 77.50% when amount of sodium humate solution were 8mL. Similarly, the adsorption ratio of Mg 2+ reached 83.60% when amount of sodium humate solution were 6mL. This indicated that sodium humate have great adsorption to Ca 2+ and Mg 2+ . Indoor experimental results confirmed the feasibility of using sodium humate complexed Ca 2+ and Mg 2+ to prevent viscosity of polymer solution reduced, and provides a reference for the field test.