Design and Optimization of a Non-uniform Particle Sized Portland Cement in Order to Achieve the Desired Properties of the Slurry and Set Cement

In this paper، the properties of a new formulation for manufacturing and production of class G cement has been proposed. The produced industry cements have no proper rheological properties، thickening time and compressive strength. This paper investigates the effects of particle size distribution changes as a basic parameter on the principal properties of cements such as rheological properties، compressive strength، thickening time and also compatibility of designed cement with certain additives used in oilwell cements formulation such as retarders and fluid loss control. The designed cement is non-uniform and coarser than conventional cements which 50 percent of particles are in the range of 3-30 µm where this amount is more than 70 percent for other standard class G cements. The designed cement has very good rheological properties and requires lesser energy for production and more compressive strength will be obtained due to 10 percent decrease in the amount of water usage in the cement system. Since the use of additional additives leads to more cost، the proposed cement designed in a way that a heavy cement will be obtained without using weighting agents.