# Application of Low-Density Oil Well Cement Slurries Containing Ceramic Microspheres Associated with Sodium Silicate: An Eco-Friendly Alternative

## TL;DR

This paper introduces an eco-friendly cement composite for oil wells using ceramic microspheres and sodium silicate, offering better performance and reduced environmental impact.

## Contribution

A novel cementitious composite using ceramic microspheres and sodium silicate is developed as a sustainable alternative for oil well cementing.

## Key findings

- The composite achieved a compressive strength of 9.35 MPa, significantly higher than conventional pastes.
- The material met Brazilian oil industry stability standards for low fracture gradient wells.

## Abstract

The cement industry
is a significant contributor to global
pollution,
accounting for approximately 7% of the carbon dioxide emissions. This
has led to the development of sustainable, high-performance materials
for sensitive applications such as oil well cementing. This study
developed and characterized a cementitious composite, in which part
of the cement was replaced by hollow ceramic microspheres (MS) combined
with sodium silicate. This innovative approach resulted in a more
environmentally friendly product by reusing low-value industrial waste.
Mechanical and chemical characterizations, such as compressive strength,
shear stress, pressure analysis, X-ray fluorescence (XRF), X-ray diffraction
(XRD), and scanning electron microscopy (SEM), were conducted to evaluate
performance. The optimized paste was further analyzed through high-pressure
rheology, providing key experimental data for reservoir simulations.
The material showed Bingham-type rheological behavior and achieved
a compressive strength of 9.35 MPa, which is significantly higher
than that of conventional pastes (4 MPa). Additionally, it met the
stability standards of the Brazilian oil industry, confirming its
suitability for oil wells with low fracture gradients.