Improving the mechanical properties of cement-based composites is helpful to ensure the integrity of the cement sheath. As oil well cement is a brittle material, microcracks or microgaps are easily produced under the influence of perforation, fracturing, exploitation, and so on, which will result in the destruction of cement sheath integrity and affect the safe and efficient exploitation of oil and gas wells. Oil well cement is the main component of cementing material. The cement sheath seals the formation effectively and supports and protects the casing at the same time. ![]() IntroductionĬementing involves injection of cement slurry into the annulus between casing and formation, thus forming cement sheath after solidification. Thus, it improved the mechanical properties and reduced the brittleness of cement paste. The modified TPR particles formed a plastic polymer network structure in the cement stone and penetrated the cement hydration products, filling in the cement paste to form a flexible structural center. Moreover, the modified TPR greatly improved the deformation capacity and decreased the elastic modulus of the cement paste. Compared with the pure cement paste, the compressive strength of the cement paste with addition of TPR modified by KH570 was reduced, but the flexural strength and impact strength of the cement paste were effectively enhanced. ![]() The results demonstrated that the hydrophilicity of TPR particles was improved after modification with silane coupling agent 3-methacryloxypropyltrimethoxysilane (KH570), and its application effect in cement slurry was excellent. The fracture surface morphology of TPR cement stone was observed by macrophotography and scanning electron microscopy (SEM). The application effect of modified TPR in oil well cement slurry was also evaluated. TPR was modified by different silane coupling agents, and the hydrophilicity of the modified TPR was studied by Fourier-transform infrared (FT-IR) spectroscopy and dispersion stability photography. The surface hydrophilicity of thermoplastic rubber (TPR) is poor, and the effect of using it directly in oil well cement is not good.
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