Banca de DEFESA: FILIPE SILVA DE OLIVEIRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : FILIPE SILVA DE OLIVEIRA
DATE: 06/01/2023
TIME: 09:00
LOCAL: Auditório do LabCim/IQ
TITLE:

DEVELOPMENT OF CEMENT SLURRY SYSTEMS FOR APPLICATION IN WELLS SUBJECT TO GAS MIGRATION

KEY WORDS:

Well Cementing; Gas Migration; Oil Well, SBR Latex; Experimental Planning

PAGES: 105
BIG AREA: Engenharias
AREA: Engenharia de Energia
SUMMARY:

Cementing failures manifest themselves through the channels around the casing in the annular space. They can result in safety, environmental, and economic problems in offshore oil production. Annular gas migration is not only a problem inherent to casings positioned at shallow depths, but also in operations involving the use of workover or production columns in wells drilled onshore or offshore. However, the biggest risk in fact is gas migration behind the conductive casing or surface casing because, due to the shallow depth, the gas can reach the surface within a few hours. Interventions to stop the flow of gas through the annulus are difficult to implement, so preventing it from happening is the best way to promote safety and protect the environment. Gas migration during well cementing is one of the major problems in oil well engineering. Its occurrence can cause from minor problems to loss of control of the well after cementing. The national scientific research in this area is still under development, and as for the international scenario, few publications have been found in the last 10 years. The greatest evidence of publications in the area of gas migration in well engineering is in the filing of patents. Possibly, because this is a problem of great commercial and industrial interest, contractors are investing in particular technologies and, as a consequence, the technological patent. Technological claims in the area of gas migration date back to the 1980s and 1990s. The most recent ones relate to more contemporary needs, such as the need to explore in ultra-deep water sheets and exploration in Arctic regions. The classic patented systems are widely used and meet the required needs, i.e., there is greater resistance to replacing a reliable and reproducible system with a new, little tested and known technology. Despite the fact that these systems are already conventionalized and widely used in the market, failures still occur, because the phenomenon of gas migration can occur by various mechanisms, in various stages of cementation. These facts reinforce the need for research on new ways to combat the phenomenon of gas migration, studying mechanisms of action of chemical additives to ensure safety and quality in the cementation of oil wells. Based on the above, this work aims to evaluate the performance of different chemical additives (SBR Latex, Nano Silica and Sodium Silicate), studying the effect of the cement paste composition on its properties and its ability to resist gas migration. For this, a factorial design with central points was adopted. The variations in the concentrations of three additives (SBR Latex, Nano Silica and Sodium Silicate) and their respective interactions were analyzed. Static filtration, rheology, static (SGS) and dynamic gels and flow tests (CHA) were performed. The results obtained show that although the paste system meets the requirements for filtrate control (< 30 ml API) and with short gel transition time (< 30 min), it is not always suitable for use in gas migration scenarios. It is shown that there is a relationship between additive concentrations with filtrate control, gel transition time and gas migration.

COMMITTEE MEMBERS:
Externa ao Programa - 2621720 - ANA CECILIA VIEIRA DA NOBREGA - nullInterno - 1298936 - ANTONIO EDUARDO MARTINELLI
Externo à Instituição - BRUNO LEONARDO DE SENA COSTA - UFRN
Externa à Instituição - FABÍOLA DIAS DA SILVA CURBELO - UFPB
Presidente - 1804366 - JÚLIO CÉZAR DE OLIVEIRA FREITAS