Banca de DEFESA: RAMÓN VICTOR ALVES RAMALHO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : RAMÓN VICTOR ALVES RAMALHO
DATE: 18/03/2022
TIME: 09:00
LOCAL: google meets
TITLE:

MECHANICAL PROPERTIES ANALYSIS OF CEMENT SLURRIES ADDITIVED WITH MAGNESIUM OXIDE AND SBR LATEX

KEY WORDS:

Portland cement; Magnesium oxide; SBR latex; Expansive cements; Compressive strength; Shear strength; Experimental design.

PAGES: 110
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

Leaks through the cement sheath have been a persistent and chronic problem in the oil industry for decades. Thus, several additives are used to strengthen the cement matrix and cause better adaptation of the slurry to the well scenario. Drying shrinkage caused by water loss and gel consolidation is a serious disadvantage of Portland cement. This shrinkage is capable of creating microcracks when the stresses are greater than the tensile strength of the cement, which significantly increases the permeability of this material. Magnesium Oxide (MgO) is an additive capable of reducing drying shrinkage through an isomorphic substitution between calcium and magnesium in the cement structure. SBR Latex is a widely used additive to prevent gas migration as it reduces fluid loss, increases acid resistance and improves the microstructural bonds of cement. Based on this, this work evaluates the influence of MgO and SBR latex additives using experimental design. The results reaffirm the effects of MgO and SBR Latex in reducing scenarios favorable to leaks. They show the strong influence of MgO in reducing drying shrinkage and gel formation. They indicate that MgO has low influence on Compressive strength in the early stages of curing but has an important influence throughout curing and also has a strong influence on the Shear Strength of the slurry. They show that SBR Latex is an additive capable of reducing the Compressive Strength by increasing the elasticity of the slurry and that it has little practical influence on the shear stresses. From the results obtained, it is possible to determine better conditions for the formulation of slurries that use MgO and/or Latex SBR applicable in oil well cementing operations.

BANKING MEMBERS:
Presidente - 1481705 - SALETE MARTINS ALVES
Externo ao Programa - 1804366 - JÚLIO CÉZAR DE OLIVEIRA FREITAS
Externo ao Programa - 1995142 - RODRIGO CÉSAR SANTIAGO
Externo à Instituição - BRUNO LEONARDO DE SENA COSTA - UFRN
Externo à Instituição - DENNYS SALVINO SERGIO PEREIRA