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In order to define the working in the Nanpu oilfield no. 1 injection Wells into scale ion source structure, introducing the Stiff - Davis, prediction of calcium carbonate scale, combining this method with actual production, the scale formation prediction model is set up, find out critical calcium ions concentration, calculated the critical calcium content. According to the content of nanpu oil field in three-phase water outlet ion data, using linear regression method, set up at different times of calcium ion content change curve, compared with critical calcium ion content, find the fouling ion source. Through research shows that working in the nanpu oilfield no. 1 main scale structure type is calcium carbonate scale, the main scale ion Ca 2+  and HCO 3 -from high pressure well liquid.

Analysis on the source of scale-forming ions in water injection wells of No.1 structure in Nanpu Oilfield