Application of Low-Dosage Hydrate Inhibitors in Deepwater Operations

Summary Novel low-dosage hydrate inhibitors (LDHI) have been developed for applications in oil and gas fields. A new generation of kinetic inhibitors has been used to prevent hydrate formation frequently encountered in deepwater operations. These chemicals effectively inhibit hydrate formation, regardless of the water cut in the system. They also exhibit a low toxicity that leads to very favorable environmental ratings. Valuable experience has been learned from recent laboratory studies and field trials with respect to the application limits and implementation techniques for these new products. The key to the overall success is a full integration of a good front-end design, a comprehensive deployment plan, and an effective monitoring program. An overview of the chemistry of these new inhibitors is discussed briefly along with their performance under simulated deepwater conditions. In addition, the effect of LDHI on hydrate formation and the effect of pressure on LDHI performance are addressed.