Banca de DEFESA: LORENA LEAL DE OLIVEIRA SOARES

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : LORENA LEAL DE OLIVEIRA SOARES
DATE: 18/08/2023
TIME: 09:00
LOCAL: Ambiente Virtual
TITLE:

High-Power Ultrasonic-Assisted Tool for Calcium Carbonate Scale Prevention

KEY WORDS:

SCALE, CALCIUM CARBONATE, PHYSICAL INHIBITOR, ULTRASOUND.

PAGES: 104
BIG AREA: Outra
AREA: Robótica, Mecatrônica e Automação
SUMMARY:

The inorganic salts scale can cause several damages to the oil industry installations. They can occur in pipes and equipment and can cause reduction and even total blockage of the flow of fluids. Scales generate high maintenance and remediation costs. Calcium carbonate is one of the salts that most deposit and that is why several studies have been carried out to better understand the process of scales formation and deposition. One way to decrease fouling-related costs is prevention. For this there are several techniques that are already used in the industry, for example, chemical and physical inhibitors. This paper proposes a calcium carbonate scale physical inhibitor assisted by ultrasound. Two approaches have been taken: (i) bonded piezoelectric ceramics directly into a tube section and (ii) Langevin ultrasonic transducers coupled to a pipe section. Initially, an investigation was made of the piezoelectric ceramic use a coupled to a section external wall of pipeline filled with water. In this configuration, tests were carried out to determine pressure zones and conductivity with solutions of calcium chloride and sodium carbonate as precursors. Such tests were important for the study, as they showed: (i) the existence of acoustic pressure zones, confirming that there is ultrasonic action in the pipe section and (ii) the influence of ultrasound on calcium carbonate precipitation, by decreasing the induction time. Despite the low power used, ultrasound was able to promote the calcium carbonate crystals precipitation acceleration. In addition, assembled arrangement modeling and simulation were carried out in order to confirm the result obtained in the tests with piezoelectric ceramics glued to the tube wall. In the second approach, an ultrasonic tool was developed with Langevin-type transducers. Through modeling and simulation in the COMSOL Multiphysics® software, the configuration of 56 transducers distributed in groups of eight by seven steel rings was achieved, in a tube measuring one meter and 1 1/2” in diameter, Schedule pattern with 48.26 mm outside diameter. Tests were carried out with aluminum sheets and tests with calcium carbonate in the laboratory, for which the tool was assembled with three rings. The laboratory tests were carried out in the high-pressure line of the Interdisciplinary Center of Fluid Dynamics - NIDF, with initial pressures of 8 and 20 bar and final pressure of 80 bar. In addition to the pressure curve, the average particle size and the test specimen masses were measured. The material embedded in the specimens was analyzed using a scanning electron microscope (SEM). Despite the tool having been tested with three of the seven rings, the tests demonstrated that there is feasibility of using the tool in oil wells.

COMMITTEE MEMBERS:
Presidente - 1194490 - IURI MUNIZ PEPE
Externo ao Programa - 286723 - EDNILDO ANDRADE TORRES - UFBAExterno à Instituição - GEYDISON GONZAGA DEMETINO - UFRB
Externo à Instituição - GERMANO PINTO GUEDES - UEFS
Externo à Instituição - DION BARBOSA DOS SANTOS RIBEIRO