Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
INFLUENCE OF THE PRESSURE ON THE ETHANE HYDRATES KINETICS
Submission Author:
Ana Carolina Rebello , RJ , Brazil
Co-Authors:
Ana Carolina Rebello, Gustavo Alonso Barrientos Sandoval, Monica Naccache, Paulo Roberto de Souza Mendes, Adriana Teixeira, Leandro Valim
Presenter: Ana Carolina Rebello
doi://10.26678/ABCM.COBEM2021.COB2021-0275
Abstract
In offshore oil and gas production and transportation a variety of issues can occur, which hinder or fully stop the flow within the pipeline. Production stoppage in this industry can cause huge financial costs and environmental commitments. Asphaltene precipitation, wax and sand deposition, and hydrate formation are some of the problems that can occur in the subsea pipeline. Hydrates, for example, are studied on a large laboratory scale due to the industry’s interest in understanding them. They are crystalline water-based solids physically similar to ice, and form when guest molecules are trapped inside cages built by the water hydrogen bonds. These substances are stable under specific thermodynamic conditions of low temperatures and high pressures. Several chemical, thermal, and mechanical methods have been employed to solve hydrate formation problems over the years. However, these aforementioned methods are not successful in avoiding or controlling hydrates under certain thermodynamic conditions, or when there are specific cut-off levels of water present in the systems. One approach to study the kinetics of hydrate formation is through the rheological technique since chemical inhibitors and different thermodynamic conditions could be mimic on the rheometric pressure cells. Moreover, the rheological perspective is an essential complement regarding the understanding of hydrates because it allows an effective comprehension of hydrates fluidity in the production pipelines. Aiming to contribute with the study in this field, the main purpose of this work is to analyze the rheological behavior of ethane gas hydrates formed from water-in-model oil emulsions in a high-pressure system. The emulsions are composed of primol oil, span 80 surfactant and deionized water. The measurements are performed in a rotational rheometer using a vane geometry as a rheometric sensor. To keep the pressure cell constant and to make an accurate temperature control, a syringe pump and a thermostatic bath are used, respectively. The results are shown through viscosity and pressure curves as a function of the experimental time. The effects of pressure on the hydrate slurry rheology were analyzed. In addition, the amount of hydrates formed was determined and related to the slurry rheology.
Keywords
Rheology, Ethane gas Hydrates, High-Pressure Cell
DOWNLOAD PDF VIEW PRESENTATION
