Banca de QUALIFICAÇÃO: RODRIGO CÉSAR SANTIAGO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : RODRIGO CÉSAR SANTIAGO
DATE: 28/12/2022
TIME: 10:00
LOCAL: Laboratório de Cimentos (Instituto de Química)
TITLE:

Well cementing, mortar residue, HPHT wells, well integrity

KEY WORDS:

Well cementing, mortar residue, HPHT wells, well integrity

PAGES: 70
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUMMARY:

Exploring new oil fields remains a constant pursuit, as well as increasing production in fields considered mature, in order to increase reserves and increase global energy supply. For this, optimizations are needed that contribute to the reduction of operating costs in drilling wells and that have a more significant environmental footprint, in order to reconcile the use of new technologies while ensuring greater integrity of the wells built and lower environmental impacts. With the advent of technology, it is already common to reach more aggressive oil and gas reservoir scenarios when we are talking mainly about parameters such as high temperature and high pressure. However, under these conditions there are greater challenges to be considered, especially in relation to the cementation project, since at temperatures above 110 °C the cement undergoes changes in its hydration, which tend to favor the formation of phases with greater permeability and causing the retrogression of its mechanical resistance, making the cement vulnerable to the hydraulic isolation of the well and compromising its integrity. On the other hand, the industrial sector, in general, generates a significant amount of waste, many of which do not have adequate applications or destinations. As an example, the mortar production industry generates a by-product that was previously discarded and the objective of this work is to apply this waste in cement slurries subject to the high temperatures and pressures of oil and gas wells in order to add value through the development of a commercial blend to be potentially used in the drilling of wells as a technologically efficient product that reduces the use of cement by up to 35% without losing the required properties, which also contributes to the reduction of costs and environmental impacts. The studies were conducted with the characterization of the residue using X-ray diffraction techniques, granulometric analysis and analysis of chemical composition, and the preparation of the slurries were carried out with different proportions of the mixture residue + cement in scenarios of cure in conditions of high and low temperature and pressure with subsequent characterization of the formed phases and technological tests of resistance to compression, comparing the data obtained with the data of standard slurries. Preliminary results demonstrate the potential of using a cement blend with mortar residue to replace the currently marketed products, favoring positive impacts, being considered an “eco-friendly” product, providing adequate mechanical properties to operational requests and with an environmental footprint that , yet, it can reduce costs in the manufacture of slurries, facilitating the viability of operations in several fields, with HPHT conditions and where thermal recovery techniques will be applied

COMMITTEE MEMBERS:
Externo à Instituição - BRUNO LEONARDO DE SENA COSTA - UFRN
Presidente - 1804366 - JÚLIO CÉZAR DE OLIVEIRA FREITAS
Externo ao Programa - 1958858 - LUIZ HENRIQUE DA SILVA GASPAROTTO - null