Banca de DEFESA: RAYRA AMORIM SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : RAYRA AMORIM SILVA
DATE: 28/03/2022
TIME: 14:00
LOCAL: Pós-Graduação Engenharia Civil - on line
TITLE:

Principal Component Analysis for the Process of Opening Underground Caverns in Salt Rocks

KEY WORDS:

Process Variables; Numerical Simulations; Statistical Analysis.

PAGES: 90
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

The constant dynamism within the oil industry associated with the need for new technologies in terms of production, development and disposal of products were fundamental to the popularization, in recent years, of the use of underground caverns in salt rocks as an alternative for the storage of large quantities of fluids such as natural gas, crude oil and alcohol as well as the final destination of toxic waste such as radioactive waste. Salt rock is particularly useful for storage because of its low cost, low permeability and its healing potential. The opening process and subsequent development of these cavities are complex activities and encompass different areas such as transport phenomena, rock mechanics and chemical reactions, therefore, the variables involved in the process play a crucial role during the entire operation, and it is important to understand how they interact with each other and also with the fluids inside them. For this same purpose, several studies have been developed, namely, experimental tests dedicated to the search for more efficient solutions for the dissolution of salt rock or mathematical models based on these tests or numerical modeling used in the evaluation of the performance of underground caverns. In addition to these, the statistical analysis of data is also a useful tool in interpreting the results generated with numerical simulations. Thus, the present work develops numerical simulations of the dissolution mining process for opening a cave under typical conditions of water injection into a sodium chloride rock (using a finite difference code) considering different methods of saline water circulation, then the interpretation of data obtained from the modeling is made through a multivariate statistical tool. The main motivation for using the PCA (Principal Component Analysis) technique lies in the possibility of identifying through it, the variables that most influence the opening process of this cavern. For the simulations generated, the results with the statistical tool were quite satisfactory, it was found that the brine production rate contributes significantly to the process, directly influencing the behavior of other variables, the temperature in turn seems to have a secondary importance, having significant weight in terms of the second component (PC2). Regarding the total variability of the data, more than 85% of these could be represented in terms of the first component (PC1) for both scenarios studied.

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Presidente - 2749584 - IGOR FERNANDES GOMES