Addition of Polyurethane to Portland Cement

Abstract

Portland cement is by far the most important binding material used in both civil construction and oil well cementing. However, especially in the latter application, its brittle nature impairs its ability to withstand dimensional changes due to thermal gradients (RT to approximately 200°C), typical of heavy-oil recovery operations. This often results in extensive cracking of the cement sheath and debonding of the cement-casing interface, which leads to loss of zonal isolation, gas migration and production of water and oil through the well annular. Portland-Polyurethane composites have been formulated and tested in an attempt to improve the deformation ability of the cement during thermal cycles without affecting the pumping behavior or high-temperature resistance of the material. Preliminary results confirmed that the addition of small contents of polyurethane considerably improved the plasticity of the cement in approximately 50% as well as decreased porosity and permeability. No significant changes were observed in the rheological behavior of the composite slurries with respect to plain Portland cement.

Experimental Study on Flexural Properties of Polyurethane–Cement Composites under Temperature Load

“…Polyurethane materials contain active cations that can improve the mechanical properties of cementitious materials, and the addition of polyurethane significantly reduces the early brittleness of cementitious materials [22]. The product obtained by mixing polyurethane and silicate cement is similar to ordinary silicate cement but has much higher plasticity than ordinary silicate cement [23]. The mechanical properties have been significantly improved and enhanced.…”

Study on Fatigue Test and Life Prediction of Polyurethane Cement Composite (PUC) under High or Low Temperature Conditions

“…PUC is a new kind of material with excellent mechanical properties of high tensile strength, large ultimate deformation, high modulus of elasticity, and excellent bonding performance. us, PUC has great advantages in steel bridge deck pavement materials [10][11][12].…”