This paper details three field applications of combined low dose hydrate (LDHI) and corrosion inhibitor (CI) chemicals in different assets in the Southern North Sea (UKCS) gas producing area. The design and application philosophy is discussed as well as the criteria necessary to manage a safe and efficient chemical transition. The three fields all displayed mid-level degrees of sub-cooling (4 – 8 °C) with operating pressures up to 70 bar with variable water breakthrough. Corrosion was severe in some cases with over 700 ppm of H2S production combined with 1.1 mol % CO2 in the produced gas.
The paper goes onto describe the cost benefits of such applications including increased equipment efficiency, logistical savings of single chemical deployment and lower maintenance costs. In addition improved hydrate and corrosion control was achieved over the incumbent chemical. This approach achieved cost savings, including a saving of $3 million in the first year of application on one of the fields. Environmental benefits have also been realised with reduced chemical usage and discharge and improved environmental profile of the combined products when compared to the originally selected single application chemicals.