Preventing the formation of complex iron-containing sediments in the water-cut oil production

Operation oilfields "Udmurtneft" is accompanied by a set of complications the production factors, one of which is the scaling of downhole pumping equipment. A formed sediment characterized by precipitation component composition, with a predominance of iron salts in the form of sulfide. The most widely known method to combat scaling are chemicals used for the prevention or removal of already formed deposits. In the work was carried out testing of inhibitors scale marks SNPH-5313 N and Sonsol-2003 to determine the effect of the presence of formation water of iron ions on the efficiency of inhibitory anti-carbonate and calcium sulfate, and the establishment of the optimal dose for the prevention of iron salts.
Materials and methods
According to the Institute of RD-86 39-0147586-041 was defined component composition of sediments and solids using gravimetric, spectrophotometric and titrimetric methods. Titrimetric and spectrophotometric methods were used for determining the effectiveness of the scale inhibitors.
Results
The possibility of using scale inhibitors SNPH5313 N and Sonsol-2003 to prevent the formation of iron deposits in the extraction of water-cut oil.
Сonclusions
1. The presence of iron (III) ions in of produced water has a significant impact on the efficiency scale inhibitor to prevent the formation of carbonate and calcium sulfate salts.
2. The formation of complex precipitation when testing inhibitors is necessary to select the optimal reagent concentrations, effectively all the salts forming the complex precipitates.