Banca de QUALIFICAÇÃO: LUCAS PEREIRA DE GOUVEIA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : LUCAS PEREIRA DE GOUVEIA
DATE: 15/12/2021
TIME: 14:00
LOCAL: https://meet.google.com/tey-djxq-dmi
TITLE:

Integrity of worn and corroded tubes in oil wells throughout their lifecycle

KEY WORDS:

well integrity, inspection data, ultrasonic logging, eletromagnetic logging

PAGES: 88
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

This work proposes a probabilistic methodology for assessment of well integrity based on logging data gathered from the inspection of casing, production and injection tubulars. This is performed to provide an enhanced structural integrity analysis of tubulars in highly complex and risky environment, as is the case of the Brazilian pre-salt region. Casing and tubing strings are important safety barrier elements, performing crucial structural functions and isolating well and formation to prevent unexpected fluid flow. Wear and corrosion in these tubulars occur during different operations throughout its life cycle. The causes can be the direct contact of the tubes with the rock formation or other equipment ran into the well, or even the chemical attack of the fluids produced, injected or in contact with the tubes. Generally, these effects are considered conservatively in the design phase, in order to avoid situations of loss of integrity; however, there is a lot of uncertainty in these predictions. On the other hand, modern inspection equipment available, like ultrasonic and electromagnetic logging tools, have made it possible to update the actual condition of the tubes in service. To achieve this, the proposed probabilistic methodology works with scanning data of the tubes after they are installed and that have been submitted to damages due to wear and corrosion. Tube radius, thickness and mass loss are the parameters measured along the well strings. This data is treated with statistical methods to be modeled as random variables, providing a probabilistic mapping of the remaining geometry of the tubular strings along the well depth. Moreover, models for prediction of corrosion by CO2 are applied to estimate the future integrity of the tubes. This kind of non-deterministic data-driven approach leads to a better assessment of the integrity of the tubes, aiding decision-making process throughout the well life cycle. The first results show how the proposed methodology for mechanical wear log generation provides responses that are better suited with the expected condition rather than other methodologies found in literature. Furthermore, it is shown a sketch of the methodology for interpretation of electromagnetic log data into integrity loss of the tube due to corrosion.

BANKING MEMBERS:
Presidente - 1846598 - EDUARDO TOLEDO DE LIMA JUNIOR
Interno - 1742402 - JOAO PAULO LIMA SANTOS
Externo à Instituição - CHARLTON OKAMA DE SOUZA - PETROBRAS