This doctoral thesis proposes to study the rheology of water hydrate and tetrahydrofuran slurries (C4H8O - THF) at different conditions. Natural gas hydrates are crystalline solids, analogous to ice, formed by the aggregation of water and gas in a given organized structure. Their concern for the oil and gas industry is due to the potential risk related to the area of flow assurance. Thus, extensive investments are made for the purpose of preventing and evaluating the risk of hydrate formation. In this context, rheology is a significant element, since it allows to detect the formation of hydrates from variations in rheological properties, the most common being: viscosity, viscous and elastic modules. However, two fundamental conditions for the success of this approach are relatively difficult to achieve in the laboratory, the combination of high pressure and low temperature. Initially will be studied hydrate pastes formed at atmospheric pressure, still at temperatures above 0 Celsius degrees. In another moment, the effects of the addition of alcohol in the hydrate pastes will be studied and, finally, the pastes formed at pressures encountered above atmospheric pressure will be analyzed. Rheological tests were performed for different fluid compositions. Transient and steady-state results are reached, showing that rheology is strongly affected by the agglomeration and disaggregation of hydrate crystals occurring simultaneously as hydrates form and the boundary conditions surrounding the experiments.