Institute of Petroleum Engineering

Centre for Gas Hydrate Research Publications

Abstract 025
Measurement and Prediction of Hydrate Phase Equilibria for Reservoir Fluids
Tohidi, B., Danesh, A., Todd, A.C., and Burgass, R.W.
SPE Production & Facilities, 69-76, May (1996).
Problems associated with gas hydrates in the production and transportation of unprocessed wellstreams can be avoided by either preventing hydrate formation or allowing the formation of hydrates, but preventing their aggregation, and transporting them as slurry. The first approach, which is the current practice in the industry, can be made more cost effective by determining the hydrate-phase boundary more reliably. For the second approach, it is necessary to determine the amount of hydrate to be transported as slurry. This paper reviews the effect of electrolyte solutions and heavy hydrate formers (such as benzene, cyclohexane, and methylcyclopentane) on the hydrate-free zone and discusses new methods and equipment for measuring the amount and composition of different phases in hydrate-forming conditions. An in-house numerical model has been successfully employed for prediction of the hydrate-free zone and the compositional data.

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