The investigation of hydrate deposition is a significant basis for the hydrate prevention strategy during avoidance typhoons for deepwater gas wells. Shut-in operation is a necessary procedure due to avoidance typhoon, the hydrate intrinsic kinetic potential increases the growth rate under shut-in conditions. We establish the model of hydrate thickness investigation and the simulations illustrate that the hydrate thickness layer is relatively minor during avoidance typhoon. Meanwhile, hydrate is aggravated by the environment of low temperature and strong disturbance near the mud line due to production after avoidance typhoon. We discuss the variation of temperature profile and concentration of ethylene glycol during restart operation. The concentration variation of the ethylene glycol on the induced flow show after restart operation that the hydrate inhibitor satisfies the hydrate prevention requirements. This research provides a significant design for the hydrate management program during avoidance typhoon for deepwater gas wells, which is useful to the development of traditional avoidance strategy and decreased the cost of hydrate inhibitors.

Keywords:
scale remediation, production chemistry, flow assurance, oilfield chemistry, paraffin remediation, hydrate remediation, upstream oil & gas, inhibitor, shut-in operation, scale inhibition
Subjects:
Production Chemistry, Metallurgy and Biology, Flow Assurance, Formation Evaluation & Management, Inhibition and remediation of hydrates, scale, paraffin / wax and asphaltene, Hydrates
Copyright 2021, Society of Petroleum Engineers
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