Adsorption of Calcium and Magnesium Ions and Thickening Effect

Abstract

Waste water rich in high-concentration Ca²⁺、Mg²⁺ in a block of Daqing Oilfield,  the influence of Ca²⁺and Mg²⁺ on polymer solution viscosity is considered. To use of  sodium humate solution which compound by turf and NaOH complexed Ca²⁺ and Mg²⁺, reduced the impact of Ca²⁺ and Mg²⁺ on the polymer solution viscosity, so reached oilfield reinjection water viscosity standards. Research show that polymer solution viscosity lossed seriously when Ca²⁺ and Mg²⁺ content in 0 ~ 200mg / L, viscosity loss rate reached maximum 63.2% and 70.7%, respectively. The adsorption ratio of Ca²⁺ reached 77.50% when amount of sodium humate solution were 8mL. Similarly, the adsorption ratio of Mg²⁺ reached 83.60% when amount of sodium humate solution were 6mL. This indicated that sodium humate have great adsorption to Ca²⁺ and Mg²⁺. Indoor experimental results confirmed the feasibility of using sodium humate complexed Ca²⁺ and Mg²⁺ to prevent viscosity of polymer solution reduced, and provides a reference for the field test.