Scale squeeze treatment design optimization for an offshore Norwegian sector field

The field is located in the northern part of the North Sea and produces oil and gas condensate from sandstone reservoirs. The field has pressure support with injection of gas, seawater and seawater alternation gas (WAG). In this paper, the focus is on a well which gets pressure support from a seawater injector. The
main concerns are scale deposition in the well tubing and the near wellbore area. A PLT performed in 2012 indicated BaSO4 scale deep in the well, indicating that previous treatments have not provided scale protection through the full wellbore length. Same amounts of chemical were applied in the last two treatments
performed but injected at different pump rates, 1,000 l/min and 500 l/min, respectively. The change in the pump rate led to different treatment lifetimes, where the treatment at lower flow rate showed a slightly longer squeeze lifetime, which is likely due to the placement of the chemical. The main purpose of this paper is to evaluate the scale inhibitor placement by analysing the returns
from the previous two treatments.