نوع مقاله : مقاله پژوهشی
پژوهشگاه صنعت نفت، پژوهشکده مهندسی نفت، گروه پژوهش حفاری و تکمیل چاه
عنوان مقاله [English]
There is no history of cement slurry design incorporating nanotechnology. However, in developed countries, lightweight slurries have been designed using foam, microspheres, and Lite Crete technology. These slurries differ significantly from RIPI’s slurry containing nanoparticles in properties. Generally, lightweight cement slurry presents some disadvantages such as undesirable rheological properties, low compressive strength, and high porosity and permeability. In this study, by using HSL nanoparticles, microspheres, and cement class G and employing particle size distribution, 62-pcf slurries were obtained according to downhole conditions. In this method, with choosing the optimum range of particle size, the problems of lightweight slurries were solved. In addition, the waiting time of cement (WOC) to reach a minimum compressive strength of 500 psi was decreased to 8 hours. The 24-hour compressive strength was 2000 psi at 190 °F; moreover, the porosity and permeability of the cement were about 36% and 0.01 md respectively for a slurry formulation with 8.34 ppg. Furthermore, the special properties of anti-gas migration additives such as low shrinkage and fast compressive strength were inherently developed in the slurries.