The effect of polypropylene fiber on the curing time of class G oil well cement and its mechanical, petrophysical, and elastic properties

Abstract

The cement paste is subjected to various loads throughout a well’s life, which may compromise some of its essential characteristics and impair its performance. When the cement paste is first being formed and the cement’s characteristics have not yet fully matured, these loadings take on greater importance. In this study, the early properties of cement used in oil wells that contains polypropylene fiber are assessed. Five different curing times were used to prepare ten cement samples (6, 12, 24, 48, and 72 h). Five samples contained polypropylene fiber, while the remaining five samples were without polypropylene fibers. After the samples were prepared, the examination of several early cement properties took place. Nuclear magnetic resonance (NMR) was used to describe each sample in order to determine how the curing times affected the cement’s porosity. The findings demonstrated that both cement systems’ compressive and tensile strengths increased with curing time, and that adding polypropylene fiber enhanced the cement’s strength. The porosity and permeability of the cement specimens were significantly reduced with the incorporation of polypropylene fibers, as well as with time during the curing process for both cement samples. The reduction of Young’s modulus and the increase in Poisson’s ratio show that the addition of polypropylene fibers also makes the cement more elastic. To express variations in porosity as well as compressive and tensile strengths, logarithmic relationships were constructed. While the Poisson’s ratio, Young’s modulus, density variations, and permeability were precisely modeled by power-law equations.

Evaluation of Waste Tag Pins as Fibers in Gypsum Plasters

“…There are other studies stating that there is a decrease in the pore structure with the use of PP fiber. For example, Ahmed et al [31] reported in his study that the porosity of the sample produced only with cement was 21.2% after 48 h of hydration, while the porosity of the sample containing PP fiber was 19.2% after the same period. It is thought that this is because PP fibers have a high specific surface and thus accelerate the hydration kinetics.…”

The Combined Effect of Nanoclay Powder and Curing Time on the Properties of Class G Cement

“…Some of these techniques analyze the cement's reaction rate, while others analyze the cement's chemical or physical properties at various times [42,43]. For example, Ahmed et al [44] investigated the impact of adding polypropylene fiber to class G oil well cement on its curing time and various properties. The study found that the addition of polypropylene fiber enhanced the cement's strength, reduced porosity and permeability, and increased elasticity.…”