关键词: 结垢, EDTA滴定法, 静态阻垢法, 阻垢剂

Abstract: Along with oilfield water content rising, the scaling phenomenon is quite severely in the ground and gathering system.In view of the scaling characteristics of Xinjiang oilfield, Seven typical wells of three areas were selected.The scaling reason in oil well was studied by X-ray diffraction measurement to scale obtained from oilfield.Influences of environmental factors, such as time, temperature, pH value, concentration of scaling to scaling were investigated by EDTA titration method.The application efficiency of a novel complex scale inhibitor was evaluated by using the static scale inhibitor method.It is found that the scale of the oilfield is mainly composed of carbonate scale.The scaling kinetics changes suddenly at 9h.The raising temperature will decrease the solubility of the scale of CaCO₃ in the water.The higher the pH value is, the stronger the tendency formed of carbonate scale is.The raising concentration of Ca²⁺, Mg²⁺ and HCO₃^- is in favor of the formation of carbonate scale.Inhibition efficiency of the complex scale inhibitor composed of HX-1 and WAS with volume ratio 1:1 is more than 93.9%, which shows good application effect in the oilfield.

Key words: scaling, EDTA titration method, static scale inhibitor method, scale inhibitor